使用Golang 搭建http web服务器

古城微笑少年丶 2022-01-26 03:47 420阅读 0赞

Golang在搭建web服务器方面的能力是毋庸置疑的。官方已经有提供net/http包为搭建http服务器做准备。使用这个包能很简单地对web的路由，静态文件，模版，cookie等数据进行设置。至于这个包是否好用，这个就见仁见智了。你可以从net包开始封装一个web框架，当然也可以基于http包封装一个web框架。但是不论你是打算怎么样做，了解基本的net/http包一定是你借鉴的基础。

# 需求 #

我们要做两个简单的后台web系统。这个系统简单到只有两个页面：登陆和首页。

## 1 登陆页面 ##

[![clip\_image001\[4\]][clip_image001_4]][clip_image001_4_clip_image001_4]

登陆页面需要提交用户名和密码，将用户名和密码和mysql数据库中的用户名密码比对达到验证的效果。mysql数据库的go语言驱动推荐使用mymysql（[https://github.com/ziutek/mymysql][https_github.com_ziutek_mymysql]）。

当用户名和密码正确的时候，需要在cookie中种下用户名和加密后的密钥来进行cookie认证。我们不对cookie设置ExpireTime，这样这个cookie的有效期就是浏览器打开到浏览器关闭的session期间。

另外，这个页面还需要加载一个js。提交用户名和密码的是由js进行ajax post命令进行查询的。

这个页面需要加载css，进行页面排版

## 2 首页 ##

[![clip\_image002\[4\]][clip_image002_4]][clip_image002_4_clip_image002_4]

首页是非常简单，但它是一个动态页面。

首先右上角的”欢迎登陆， 管理员：yejianfeng“。这里的用户名yejianfeng是根据不同的用户会进行变化的。这里需要用到模版，我们又会用到了一个模版包html/template。这个包的作用就是加载模版。

其次这个页面也需要的是css，js（退出系统的删除cookie操作由js控制）

# 路由 #

分析下访问路径，会有几个文件：

### /admin/index -- 首页 ###

### /login/index --登陆页显示 ###

### /ajax/login -- 登陆的ajax动作 ###

### /css/main.css -- 获取main的css文件 ###

### /js/login.js -- 获取登陆的js文件 ###

在net/http包中，动态文件的路由和静态文件的路由是分开的，**动态文件使用http.HandleFunc进行设置**，**静态文件就需要使用到http.FileServer**

这里的http.FileServer(http.Dir("template"))的路径是怎么算的要注意下了。相对路径都是从当前执行路径路径下开始算的，这里设置的路径树是这样：

[![clip\_image003\[4\]][clip_image003_4]][clip_image003_4_clip_image003_4]

关于http.HandleFunc如果不理解请参考我的上一篇文章

[http://www.cnblogs.com/yjf512/archive/2012/08/22/2650873.html][http_www.cnblogs.com_yjf512_archive_2012_08_22_2650873.html]

# 处理器 #

这里需要定制4个handler对应相应的一级路径。我们将这些个handler都放入到route.go文件中

# 页面404处理器 #

main中的逻辑是当/admin/ /login/ /ajax/都不符合路径的时候就进入404页面处理器NotFoundHandler

这段逻辑是很清晰的：如果路径是"/" 即访问路径是[http://192.168.100.166:8888/][http_192.168.100.166_8888] 的时候，访问会跳转到登陆页面，否则当访问路径不满足制定的路由，读取404模版，显示404。

### 强烈推荐使用template.ParseFile模版文件解析 ###

template包中也提供了Parse这类直接在代码中写上模版的函数。使用起来，你会发现这类函数远没有ParseFile好用，原因很明显，如果你把模版写在代码中，一旦模版需要进行小细节的修改，也需要重新编译。并且我们使用模版的目的就是将显示逻辑和业务逻辑分离，Parse会导致整个代码是不可维护！

当然有人会考虑到效率问题，一个是读取文件，一个是直接读取内存。但是我觉得这点效率差别用户根本不会察觉到，牺牲极小的性能保证工程性是很值得的。

ParseFile中的路径问题也是很容易犯的问题。这里的填写相对路径，则文件是从当前执行的路径开始算。

[![clip\_image004\[4\]][clip_image004_4]][clip_image004_4_clip_image004_4]

比如这个路径，执行bin/webdemo，template/html/404.html就对应/go/gopath/template/html/404.html

这一步后续动作是在template/html文件夹中创建404.html页面

# 登陆页面处理器 #

根据MVC思想，对具体的逻辑内容使用不同的Controller，这里定义了一个loginController, 使用reflect将pathInfo映射成为controller中的方法。

这样做的好处显而易见：

1 清晰的文件逻辑。不同的一级目录分配到不同的控制器，不同的控制器中有不同的方法处理。这些控制器放在一个独立的文件中，目录结构清晰干净。

2 路由和业务逻辑分开。 main中的http.HandleFunc处理一级路由，route处理二级路由，controller处理业务逻辑，每个单元分开处理。

好了，下面需要定义loginContrller，我们另外起一个文件loginController.go

下面需要创建template/html/login/index.html

这个文件中包含mian.css, jquery.js, base.js。 创建这些css和js。具体的css和js内容请看github源码

js中的逻辑是这样写的：当login表单提交的时候，会调用/ajax/login进行验证操作，下面就开始写ajax的处理器

# ajax处理器 #

route中的ajaxHandler和loginHandler是大同小异，这里就忽略不说了，具体说一下ajaxController

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    <div style="border-width:0px 2px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.8em;text-align:right;vertical-align:baseline;background-image:none;">
      70 
    </div> 
    <div style="border-width:0px 2px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.8em;text-align:right;vertical-align:baseline;background:rgb(244,244,244) none;">
      71 
    </div> 
    <div style="border-width:0px 2px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.8em;text-align:right;vertical-align:baseline;background-image:none;">
      72 
    </div> </td> 
   <td style="border:1px solid #C0C0C0;border-collapse:collapse;line-height:1.1em;vertical-align:baseline;background:none;"> 
    <div style="border:0px;line-height:1.1em;vertical-align:baseline;background:none;"> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">package main</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">import (</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"net/http"</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"github.com/ziutek/mymysql/autorc"</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">_&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"github.com/ziutek/mymysql/thrsafe"</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"encoding/json"</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;">
       &nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">type Result&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">struct</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">{ </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">Ret&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">int</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">Reason&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">string</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">Data&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">interface</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">{}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;">
       &nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">type ajaxController&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">struct</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">{ </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">func (</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">this</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">*ajacController)LoginAction(w http.ResponseWriter, r *http.Request) { </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">w.Header().Set(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"content-type"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"application/json"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">err := r.ParseForm()</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">if</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">err != nil { </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">OutputJson(w, 0,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"参数错误"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, nil)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">return</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">admin_name := r.FormValue(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"admin_name"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">admin_password := r.FormValue(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"admin_password"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">if</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">admin_name ==&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">""</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">|| admin_password ==&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">""</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">{ </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">OutputJson(w, 0,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"参数错误"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, nil)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">return</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">db := mysql.New(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"tcp"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">""</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"192.168.199.128"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"root"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"test"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"webdemo"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">if</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">err := db.Connect(); err != nil { </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">OutputJson(w, 0,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"数据库操作失败"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, nil)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">return</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">defer db.Close()</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">rows, res, err := db.Query(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"select * from webdemo_admin where admin_name = '%s'"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, admin_name)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">if</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">err != nil { </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">OutputJson(w, 0,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"数据库操作失败"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, nil)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">return</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">name := res.Map(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"admin_password"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">admin_password_db := rows[0].Str(name)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">if</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">admin_password_db != admin_password { </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">OutputJson(w, 0,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"密码输入错误"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, nil)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">return</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,130,0);background:none;">// 存入cookie,使用cookie存储</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">expiration := time.Unix(1, 0)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">cookie := http.Cookie{Name:&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"admin_name"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, Value: rows[0].Str(res.Map(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"admin_name"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)), Path:&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"/"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">http.SetCookie(w, &amp;cookie)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">OutputJson(w, 1,&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:#0000FF;background:none;">"操作成功"</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, nil)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">return</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">func OutputJson(w http.ResponseWriter, ret&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">int</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, reason&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">string</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">, i&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">interface</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">{}) { </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">out</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">:= &amp;Result{ret, reason, i}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">b, err := json.Marshal(</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">out</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">if</code>&nbsp; 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">err != nil { </code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,255);background:none;">return</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background:rgb(244,244,244) none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;background:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">w.Write(b)</code> 
     </div> 
     <div style="border:0px;line-height:1.8em;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);background:none;">}</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

这段代码有几个地方可以看看：

## 如何设置header： ##

w.Header().Set("content-type", "application/json")

## 如何解析参数： ##

err := r.ParseForm()

admin\_name := r.FormValue("admin\_name")

## 如何连接数据库 ##

db := mysql.New("tcp", "", "192.168.199.128", "root", "test", "webdemo")

当然这里得需要有个数据库和数据表，建表和建表的sql文件在github上能看到

create table webdemo\_admin

(

admin\_id int not null auto\_increment,

admin\_name varchar(32) not null,

admin\_password varchar(32) not null,

primary key(admin\_id)

);

## 如何设置cookie ##

cookie := http.Cookie\{Name: "admin\_name", Value: rows\[0\].Str(res.Map("admin\_name")), Path: "/"\}

http.SetCookie(w, &cookie)

# 主页处理器 #

adminHandler的逻辑比其他Handler多的一个是需要 **获取cookie**

cookie, err := r.Cookie("admin\_name")

并且在传递给controller的时候需要将admin\_name传递进去

其他的部分都是一样的了。

它对应的Controller的Action是

这里就将user传递出去给admin/index模版

模版内部使用\{ \{.UserName\}\}进行参数显示

# 后记 #

至此，这个基本的webdemo就完成了。启动服务之后，就会在8888端口开启了web服务。

当然，这个web服务还有许多东西可以优化，个人信息验证，公共模板的提炼使用，数据库的密码使用密文等。但是这个例子中已经用到了搭建web服务器最基本的几个技能了。

# 源代码 #

本文所涉及的源代码放在github上

[https://github.com/jianfengye/webdemo][https_github.com_jianfengye_webdemo]

[clip_image001_4]: http://images.cnblogs.com/cnblogs_com/yjf512/201209/201209031038274403.png
[clip_image001_4_clip_image001_4]: /images/20220126/0e0df64ba1424bc2963346a745b6c1e4.png
[https_github.com_ziutek_mymysql]: https://github.com/ziutek/mymysql
[clip_image002_4]: http://images.cnblogs.com/cnblogs_com/yjf512/201209/201209031038282635.png
[clip_image002_4_clip_image002_4]: /images/20220126/fa72bb63f19a410a8ec023179096e028.png
[clip_image003_4]: http://images.cnblogs.com/cnblogs_com/yjf512/201209/201209031038299504.png
[clip_image003_4_clip_image003_4]: /images/20220126/39fe7e3e36014b0e90cb5075c30039da.png
[http_www.cnblogs.com_yjf512_archive_2012_08_22_2650873.html]: http://www.cnblogs.com/yjf512/archive/2012/08/22/2650873.html
[http_192.168.100.166_8888]: http://192.168.100.166:8888/
[clip_image004_4]: http://images.cnblogs.com/cnblogs_com/yjf512/201209/201209031038316864.png
[clip_image004_4_clip_image004_4]: /images/20220126/43947354f13446799dbca3e94d8efe85.png
[https_github.com_jianfengye_webdemo]: https://github.com/jianfengye/webdemo