【二】、xml解析

╰半橙微兮° 2022-06-15 01:28 271阅读 0赞

> 上一篇中说到封装了HttpClient助手类和Json解析响应数据的封装。这节主要扩展响应数据解析类，封装出一个xml解析的实现类，适应微信第三方服务的接口。

主要实现的效果，把xml格式的数据转成map集合的格式，里面可能包含一个map集合，也可能包含一个List集合。甚至会对xml中的标签内属性进行封装，加上attr\_前缀进行保存。比如如下格式的xml数据：

<?xml version="1.0" encoding="utf-8"?>
    
    
    <bookstore key="11111"> 
      <book category="cooking"> 
        <title lang="en">Everyday Italian</title>  
        <author>Giada De Laurentiis</author> 
      </book>  
      <book category="children"> 
        <title lang="en">Harry Potter</title>  
        <author>J K. Rowling</author> 
      </book>  
      <book category="web"> 
        <title lang="en">XQuery Kick Start</title>  
        <author id="1">James McGovern</author>  
        <author id="1">Per Bothner</author>  
        <author id="1">Kurt Cagle</author>  
        <author id="1">James Linn</author>  
        <author id="1">Vaidyanathan Nagarajan</author> 
      </book>  
      <book category="web" cover="paperback"> 
        <title lang="en">Learning XML</title>  
        <author>Erik T. Ray</author> 
      </book>  
      <a category="web" cover="paperback">abc</a>  
      <v category="web" cover="paperback">abc 
        <title lang="en">Learning XML</title>  
        <author>Erik T. Ray</author> 
      </v> 
    </bookstore>

应该解释成map之后，转成json格式是如下的，才比较方便操作（这里有一些细节需要说明一下：如果标签中不在含有子标签，那么需要转成map集合的形式，值得key使用value，然后属性还是attr\_前缀）：

{
      "bookstore": { "a": { "attr_cover": "paperback", "value": "abc", "attr_category": "web" }, "v": { "attr_cover": "paperback", "author": { "value": "Erik T. Ray" }, "title": { "attr_lang": "en", "value": "Learning XML" }, "attr_category": "web" }, "book": [ { "author": { "value": "Giada De Laurentiis" }, "title": { "attr_lang": "en", "value": "Everyday Italian" }, "attr_category": "cooking" }, { "author": { "value": "J K. Rowling" }, "title": { "attr_lang": "en", "value": "Harry Potter" }, "attr_category": "children" }, { "author": [ { "value": "James McGovern", "attr_id": "1" }, { "value": "Per Bothner", "attr_id": "1" }, { "value": "Kurt Cagle", "attr_id": "1" }, { "value": "James Linn", "attr_id": "1" }, { "value": "Vaidyanathan Nagarajan", "attr_id": "1" } ], "title": { "attr_lang": "en", "value": "XQuery Kick Start" }, "attr_category": "web" }, { "attr_cover": "paperback", "author": { "value": "Erik T. Ray" }, "title": { "attr_lang": "en", "value": "Learning XML" }, "attr_category": "web" } ], "attr_key": "11111" } }

主要的实现类在github中给出：

[https://github.com/wulongtao/web-base-master/blob/master/src/main/java/com/xxh/web/util/format/XmlResponseParser.java][https_github.com_wulongtao_web-base-master_blob_master_src_main_java_com_xxh_web_util_format_XmlResponseParser.java]

有了这个类之后，就可以在HttpClient中使用这个类来解析响应请求了，使用方法也很简单：

Map<String, Object> res = HttpClientHelper.postRawData("http://192.168.100.244:18081/accessService" , reqParams, new XmlResponseParser());

**如果使用过android的Volley框架，你会发现其实他也是这样封装的，需要解析不同的数据也是要实现一个接口，只不过Volley是异步的**

[https_github.com_wulongtao_web-base-master_blob_master_src_main_java_com_xxh_web_util_format_XmlResponseParser.java]: https://github.com/wulongtao/web-base-master/blob/master/src/main/java/com/xxh/web/util/format/XmlResponseParser.java