Hadoop web编程--REST API WebHDFS

怼烎@ 2022-08-11 09:29 171阅读 0赞

<table style="word-wrap:break-word; empty-cells:show; border-collapse:collapse; table-layout:fixed; width:757px; color:rgb(68,68,68); font-family:Tahoma,'Microsoft Yahei',Simsun; font-size:12px; line-height:18px"> 
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   <td style="word-wrap:break-word; font-size:14px"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="color:#ff0000; word-wrap:break-word">1.外部的应用程序需要操作HDFS的情况，该如何解决？</span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="color:#ff0000; word-wrap:break-word">2.WebHDFS REST API可以完成什么事情？</span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="color:#ff0000; word-wrap:break-word">3.Httpfs 配置启动，core-site.xml、hdfs-site.xml文件改如何配置？</span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="color:#ff0000; word-wrap:break-word">4.REST API 如何启动httpfs？</span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="color:#ff0000; word-wrap:break-word">5.通过什么命令可以查看hdfs文件的状态？</span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="color:#ff0000; word-wrap:break-word">6.WebHDFS常用操作都包含什么？该如何实现？</span></span><br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> </span><span style="word-wrap:break-word; font-weight:700">1 介绍</span>&nbsp; &nbsp;&nbsp;<br style="word-wrap:break-word"> Hadoop提供了一个Java native API来支持对文件系统进行创建，重命名，删除文件或者目录，打开读取或者写文件，设置文件权限等操作。这对于运行在hadoop集群中的应用程序来说是挺棒的，但是，也有许多外部的应用程序需要操作HDFS的情况，怎么办？如果解决这种问题呢？Hortonworks 开发了一些额外的API来支持这些基于标准REST功能的需求。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700">2 WebHDFS REST API</span>&nbsp; &nbsp;&nbsp;<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> WebHDFS观念是基于HTTP操作，比如GET、PUT、POST和DELETE。像OPEN、GETFILESTATUS、LISTSTATUS的操作是使用HTTP GET，其它的像CREAT、MKDIRS、RENAME、SETPERMISSION是依赖于HTTP PUT类型。APPEND操作时基于HTTP POST类型，然而，DELETE是使用HTTP DELETE。<br style="word-wrap:break-word"> &nbsp; &nbsp; 认证方式可以使用基于user.name参数或者如果安全机制开启了就依赖于Kerberos。标准的URL格式如下所示：<br style="word-wrap:break-word"> <a href="http://host:port/webhdfs/v1/?op=operation&amp;user.name=username" style="word-wrap:break-word; color:rgb(51,102,153)" rel="nofollow">http://host:port/webhdfs/v1/?op=operation&amp;user.name=username</a><br style="word-wrap:break-word"> 默认的启动对口是14000，你可以在httpfs-env.sh 中配置端口的值。所有与httpfs有关的环境参数变量，你可以再httpfs-env.sh中进行个性化的配置。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700">3 Httpfs 配置启动</span>&nbsp; &nbsp;<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 编辑core-site.xml文件，添加如下内容：<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
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      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> …<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp;&nbsp;&lt;property&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp; &lt;name&gt;hadoop.proxyuser.#HTTPFSUSER#.hosts&lt;/name&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp; &lt;value&gt;*&lt;/value&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp;&nbsp;&lt;/property&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp;&nbsp;&lt;property&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp; &lt;name&gt;hadoop.proxyuser.#HTTPFSUSER#.groups&lt;/name&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp; &lt;value&gt;*&lt;/value&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp;&nbsp;&lt;/property&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> ….</li> 
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    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 值得注意的是，#HTTPFSUSER#指的是用户名，即linux启动httpfs的用户。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 编辑hdfs-site.xml文件，添加下列属性配置。<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
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      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;property&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; &lt;name&gt;dfs.webhdfs.enabled&lt;/name&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&lt;value&gt;true&lt;/value&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;/property&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;property&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;name&gt;dfs.permissions&lt;/name&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;value&gt;false&lt;/value&gt;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;/property&gt;</li> 
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    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> &nbsp; &nbsp; 另外，想知道更多的有关HDFS端口信息，请参考<a href="http://blog.cloudera.com/blog/2009/08/hadoop-default-ports-quick-reference/" style="word-wrap:break-word; color:rgb(51,102,153)" rel="nofollow">Cloudera blog</a>.<br style="word-wrap:break-word"> &nbsp; &nbsp; 启动httpfs，执行如下命令：<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
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      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> httpfs.sh start&nbsp;&nbsp;</li> 
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    </div> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:24px; word-wrap:break-word">4 验证</span></span><br style="word-wrap:break-word"> 一切配置好了之后，测试一下是否配置成功是非常有必要的。有这样一种情况，我们需要知道hdfs 目录下tmp的文件状态。按照这样的需求，我们可以编写这样的命令：<br style="word-wrap:break-word"> 命令行下<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
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      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> curl –i http://hadoop-master:14000/webhdfs/v1/tmp?user.name=app&amp;op=GETFILESTATUS&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 200 OK&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Server:Apache-Coyote/1.1&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Set-Cookie:hadoop.auth="u=app&amp;p=app&amp;t=simple&amp;e=1393293979907&amp;s=9YBXB7GM3oiIOYgflAjlq3GIpxc=";Version=1; Path=/&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Type:application/json&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Transfer-Encoding:chunked&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Mon, 24Feb 2014 16:06:20 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> {"FileStatus":{"pathSuffix":"","type":"DIRECTORY","length":0,"owner":"app","group":"supergroup","permission":"720","accessTime":0,"modificationTime":1391352186043,"blockSize":0,"replication":0}}&nbsp;&nbsp;</li> 
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     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> 浏览器中：<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 
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      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> http://hadoop-master:14000/webhdfs/v1/tmp?user.name=app&amp;op=GETFILESTATUS&nbsp;&nbsp;</li> 
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    </div> 返回信息：<br style="word-wrap:break-word"> 
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      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> {"FileStatus":{"pathSuffix":"","type":"DIRECTORY","length":0,"owner":"app","group":"supergroup","permission":"720","accessTime":0,"modificationTime":1391352186043,"blockSize":0,"replication":0}}&nbsp;&nbsp;</li> 
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    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <img src="http://www.aboutyun.com/static/image/hrline/2.gif" alt="" width="485" height="21" style="word-wrap:break-word"><br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:24px; word-wrap:break-word">5介绍几种常用的WebHDFS操作</span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:24px; word-wrap:break-word"><br style="word-wrap:break-word"> </span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:18px; word-wrap:break-word">5.1 创建</span></span><br style="word-wrap:break-word"> &nbsp; &nbsp;&nbsp;&nbsp;创建一个目录/tmp/webhdfs。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
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      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> curl-i -X PUT"http://hadoop-master:14000/webhdfs/v1/tmp/webhdfs?user.name=app&amp;op=MKDIRS"&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 200 OK&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Server: Apache-Coyote/1.1&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Set-Cookie:hadoop.auth="u=app&amp;p=app&amp;t=simple&amp;e=1393356198808&amp;s=74NhnIdH7WceKqgTW7UJ1ia9h10=";Version=1; Path=/&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Type: application/json&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Transfer-Encoding: chunked&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Tue, 25 Feb 2014 09:23:23 GMT</li> 
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    </div> <br style="word-wrap:break-word"> 达到相似的功能，Hadoop 命令：<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> hdfs dfs -mkdir /tmp/webhdfs</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 创建一个文件<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 创建一个文件需要两个步骤：第一步是在namenode运行命令，第二步根据第一步提供的location参数执行PUT操作。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> curl -i -X PUT"http://hadoop-master:50070/webhdfs/v1/tmp/webhdfs/webhdfs-test.txt?user.name=app&amp;op=CREATE"&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 307 TEMPORARY_REDIRECT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Cache-Control: no-cache&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Expires: Thu, 01-Jan-1970 00:00:00 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Wed, 26 Feb 2014 14:35:29 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Pragma: no-cache&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Wed, 26 Feb 2014 14:35:29 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Pragma: no-cache&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Set-Cookie:hadoop.auth="u=app&amp;p=app&amp;t=simple&amp;e=1393461329238&amp;s=as2cO3rRtvj8psr0jAhMk6YBHRY=";Path=/&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Location:http://machine-2:50075/webhdfs/v1/tmp/webhdfs/webhdfs-test.txt?op=CREATE&amp;user.name=app&amp;namenoderpcaddress=hadoop-master:9000&amp;overwrite=false&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Type: application/octet-stream&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Length: 0&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Server: Jetty(6.1.26</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> 发送数据到指定文件中：<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> curl -i -X PUT -T webhdfs-test.txt"http://machine-2:50075/webhdfs/v1/tmp/webhdfs/webhdfs-test.txt?op=CREATE&amp;user.name=app&amp;namenoderpcaddress=hadoop-master:9000&amp;overwrite=false"&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 100 Continue&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 201 Created&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Cache-Control: no-cache&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Expires: Wed, 26 Feb 2014 14:37:51 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Wed, 26 Feb 2014 14:37:51 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Pragma: no-cache&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Expires: Wed, 26 Feb 2014 14:37:51 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Wed, 26 Feb 2014 14:37:51 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Pragma: no-cache&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Location:webhdfs://0.0.0.0:50070/tmp/webhdfs/webhdfs-test.txt&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Type: application/octet-stream&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Length: 0&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Server: Jetty(6.1.26)</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:18px; word-wrap:break-word"><br style="word-wrap:break-word"> </span></span><br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:18px; word-wrap:break-word">5.2 读取文件</span></span><br style="word-wrap:break-word"> &nbsp; &nbsp; 读取/input文件信息，使用-L参数。<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> [app@hadoop-master ~]$ curl -i -L"http://hadoop-master:14000/webhdfs/v1/input?op=OPEN&amp;user.name=app"&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 200 OK&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Server: Apache-Coyote/1.1&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Set-Cookie:hadoop.auth="u=app&amp;p=app&amp;t=simple&amp;e=1393420279602&amp;s=dSnnx9oOwgGwVV/Q/ZmFyRjbtFU=";Version=1; Path=/&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Type: application/octet-stream&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Length: 1358&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Wed, 26 Feb 2014 03:11:19 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Apache HBase [1] is an open-source,distributed, versioned, column-oriented&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> store modeled after Google' Bigtable: ADistributed Storage System for&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Structured Data by Chang et al.[2]&nbsp;&nbsp;Just as Bigtable leverages the distributed&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> data storage provided by the Google FileSystem, HBase provides Bigtable-like&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> capabilities on top of Apache Hadoop[3].&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> To get started using HBase, the fulldocumentation for this release can be&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> found under the doc/ directory thataccompanies this README.&nbsp;&nbsp;Using abrowser,&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> open the docs/index.html to view theproject home page (or browse to [1]).&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> The hbase 'book' at docs/book.html has a'quick start' section and is where you&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> should being your exploration of thehbase project.&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> The latest HBase can be downloaded froman Apache Mirror [4].&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> The source code can be found at [5]&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> The HBase issue tracker is at [6]&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Apache HBase is made available under theApache License, version 2.0 [7]&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> The HBase mailing lists and archives arelisted here [8].&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 1. http://hbase.apache.org&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 2.http://labs.google.com/papers/bigtable.html&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 3. http://hadoop.apache.org&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 4.http://www.apache.org/dyn/closer.cgi/hbase/&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 5.http://hbase.apache.org/docs/current/source-repository.html&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 6.http://hbase.apache.org/docs/current/issue-tracking.html&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 7.http://hbase.apache.org/docs/current/license.html&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> 8. http://hbase.apache.org/docs/current/mail-lists.html</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:18px; word-wrap:break-word">5.3 重命名目录</span></span><br style="word-wrap:break-word"> &nbsp; &nbsp;需要修改op的值和添加destination参数，实例如下所示：<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> [app@hadoop-master~]$ curl -i -X PUT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> "http://hadoop-master:14000/webhdfs/v1/tmp/webhdfs?op=RENAME&amp;user.name=app&amp;destination=/tmp/webhdfs-new"&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> [app@hadoop-master~]$ curl -i -X PUT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> "http://hadoop-master:14000/webhdfs/v1/tmp/webhdfs?op=RENAME&amp;user.name=app&amp;destination=/tmp/webhdfs-new"&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 200 OK&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Server:Apache-Coyote/1.1&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Set-Cookie: hadoop.auth="u=app&amp;p=app&amp;t=simple&amp;e=1393420506278&amp;s=Oz9HEzxuYvP8kfAY4SWH6h+Gb50=";Version=1; Path=/&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Type:application/json&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Transfer-Encoding:chunked&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Wed, 26 Feb2014 03:15:06 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> {"boolean":true}</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> 验证是否正确地执行，输入下列命令：<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> [app@hadoop-master~]$ hdfs dfs -ls /tmp&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Found 5 items&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwx------&nbsp; &nbsp;- app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-01-08 08:02 /tmp/hadoop-yarn&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwxr-xr-x&nbsp; &nbsp;- app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-02-02 09:43 /tmp/hdfs_out&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwxr-xr-x&nbsp; &nbsp;- app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-02-20 22:39 /tmp/hive-app&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwxr-xr-x&nbsp; &nbsp;- app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-02-25 04:25 /tmp/jps&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwxr-xr-x&nbsp; &nbsp;- app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-02-25 04:23 /tmp/webhdfs-new</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700"><span style="font-size:18px; word-wrap:break-word">5.4 删除目录</span></span><br style="word-wrap:break-word"> 非空的目录删除的话会抛出异常，只有为空的目录才会被删除。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> [app@hadoop-master ~]$ curl -i -X DELETE&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> "http://hadoop-master:14000/webhdfs/v1/tmp/webhdfs-new?op=DELETE&amp;user.name=app"&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> HTTP/1.1 200 OK&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Server: Apache-Coyote/1.1&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Set-Cookie:hadoop.auth="u=app&amp;p=app&amp;t=simple&amp;e=1393421161052&amp;s=r03LOm2hO91ujcc66wNWyMJnDx4=";Version=1; Path=/&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Content-Type: application/json&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Transfer-Encoding: chunked&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Date: Wed, 26 Feb 2014 03:26:01 GMT&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &nbsp; &nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> {"boolean":true}</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> 核查是否正确地执行<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> [app@hadoop-master ~]$ hdfs dfs -ls /tmp&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> Found 4 items&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwx------&nbsp; &nbsp;-app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-01-0808:02 /tmp/hadoop-yarn&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwxr-xr-x&nbsp; &nbsp;-app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-02-0209:43 /tmp/hdfs_out&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwxr-xr-x&nbsp; &nbsp;-app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-02-2022:39 /tmp/hive-app&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> drwxr-xr-x&nbsp; &nbsp;-app supergroup&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0 2014-02-2504:25 /tmp/jps</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <span style="word-wrap:break-word; font-weight:700">总结</span>&nbsp; &nbsp;<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> WebDFS提供了一个简单、标准的方式来执行Hadoop 文件系统操作，这个客户端不必运行在Hadoop集群本身中。WebHDFS最主要的特性是让客户端通过预定义端口直接地链接namenode 和 datanode。这样的话，规避了好多HDFS proxy的代理层以及预先配置Tomcat的绑定。WebHDFD API是可互相交换的，这样让客户端不需要去打开防火墙端口。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 两种常见的异常:<br style="word-wrap:break-word"> 1. HTTP/1.1 405 HTTP method PUT is not supported by this URL<br style="word-wrap:break-word"> &nbsp; &nbsp;修改hdfs-site.xml文件的权限属性。<br style="word-wrap:break-word"> 
    <div style="word-wrap:break-word; overflow:hidden; margin:10px 0px; padding:10px 0px 5px 10px; color:rgb(102,102,102); zoom:1; border:1px solid rgb(204,204,204)"> 
     <div style="word-wrap:break-word"> 
      <ol style="word-wrap:break-word; margin:0px 0px 0px 10px!important; padding:0px!important"> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;property&gt;&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;name&gt;dfs.permissions&lt;/name&gt;&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;value&gt;false&lt;/value&gt;&nbsp;&nbsp;<br style="word-wrap:break-word"> </li> 
       <li style="word-wrap:break-word; margin:0px 0px 0px 2em; padding:0px 0px 0px 10px; list-style-type:decimal-leading-zero; font-family:Monaco,Consolas,'Lucida Console','Courier New',serif; font-size:12px; line-height:1.8em"> &lt;/property&gt;&nbsp;&nbsp;</li> 
      </ol> 
     </div> 
     <span style="word-wrap:break-word; margin-left:43px; font-size:12px; color:rgb(51,102,153)!important">复制代码</span> 
    </div> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> 2 {"RemoteException":{"exception":"AccessControlException","javaClassName":"org.apache.hadoop.security.AccessControlException","message":"Permission denied: user=dr.who, access=WRITE, inode=\"/qzhang\":Administrator:supergroup:drwxr-xr-x\n\tat<br style="word-wrap:break-word"> &nbsp; &nbsp;问题2与问题1是一个问题，解决方案同上。<br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <br style="word-wrap:break-word"> <p style="word-wrap:break-word; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:26px"> <span style="color:#000; word-wrap:break-word"><span style="font-family:Arial; word-wrap:break-word"><br style="word-wrap:break-word"> </span></span></p> #################################################<br style="word-wrap:break-word"> <a href="http://blog.csdn.net/john_f_lau/article/details/20007299" style="word-wrap:break-word; color:rgb(51,102,153)" rel="nofollow">http://blog.csdn.net/john_f_lau/article/details/20007299</a></td> 
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