一、项目背景

在Android开发中有一项非常广泛的应用：Android项目获取另一个web项目的资源或者返回的数据。本文获取web项目返回的XML数据。

二、实例代码

Web项目

1. /**  
2.  * 新闻业务类  
3.  *   
4.  * @author 徐越  
5.  *   
6.  */ 
7. public class VideoNewsServiceImpl implements VideoNewsService  
8. {  
9.     public List<VideoNews> readNews()  
10.     {  
11.         List<VideoNews> lst = new ArrayList<VideoNews>();  
12.         lst.add(new VideoNews(1, "喜洋洋", 20));  
13.         lst.add(new VideoNews(2, "变形金刚", 10));  
14.         lst.add(new VideoNews(3, "功夫熊猫", 20));  
15.         return lst;  
16.     }  
17. }  
18.  
19. /**  
20.  * 新闻Servlet  
21.  *   
22.  * @author 徐越  
23.  *   
24.  */ 
25. public class ListServlet extends HttpServlet  
26. {  
27.     private static final long serialVersionUID = 1L;  
28.     private VideoNewsService vs = new VideoNewsServiceImpl();  
29.  
30.     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException  
31.     {  
32.         doPost(request, response);  
33.     }  
34.  
35.     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException  
36.     {  
37.         List<VideoNews> news = vs.readNews();  
38.         request.setAttribute("xmlnews", news);  
39.         request.getRequestDispatcher("/WEB-INF/pages/newsxml.jsp").forward(request, response);  
40.     }  
41. } 

1. <%@ page language="java" contentType="text/xml; charset=utf-8" pageEncoding="utf-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><?xml version="1.0" encoding="UTF-8"?> 
2. <videoNews> 
3.     <c:forEach items="${xmlnews}" var="n"> 
4.         <news id="${n.id }"> 
5.             <title>${n.title }</title> 
6.             <length>${n.timeLength }</length> 
7.         </news> 
8.     </c:forEach> 
9. </videoNews> 

Android项目

1. public class VideoNewsServiceImpl implements VideoNewsService  
2. {  
3.     /**  
4.      * 获取最新视频资讯，从XML文件中，比较常用  
5.      */ 
6.     public List<VideoNews> getNewsFromXML() throws Exception  
7.     {  
8.         List<VideoNews> lst = new ArrayList<VideoNews>();  
9.         String path = "http://xxx.xxx.xxx.xxx:8080/web/ListServlet";  
10.         URL url = new URL(path);  
11.         HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
12.         conn.setReadTimeout(5000);  
13.         conn.setRequestMethod("GET");  
14.         if (200 == conn.getResponseCode())  
15.         {  
16.             InputStream instream = conn.getInputStream();  
17.             lst = parseXML(instream);  
18.         }  
19.         return lst;  
20.     }  
21.  
22.     /**  
23.      * 解析XML  
24.      */ 
25.     private List<VideoNews> parseXML(InputStream instream) throws Exception  
26.     {  
27.         List<VideoNews> lst = null;  
28.         VideoNews vn = null;  
29.         // 利用ANDROID提供的API快速获得pull解析器  
30.         XmlPullParser pullParser = Xml.newPullParser();  
31.         // 设置需要解析的XML数据  
32.         pullParser.setInput(instream, "UTF-8");  
33.         // 取得事件  
34.         int event = pullParser.getEventType();  
35.         // 若为解析到末尾,文档结束  
36.         while (event != XmlPullParser.END_DOCUMENT)  
37.         {  
38.             String nodeName = pullParser.getName();  
39.             switch (event)  
40.             {  
41.                 // 文档开始  
42.                 case XmlPullParser.START_DOCUMENT:  
43.                     lst = new ArrayList<VideoNews>();  
44.                     break;  
45.                 // 标签开始  
46.                 case XmlPullParser.START_TAG:  
47.                     if ("news".equals(nodeName))  
48.                     {  
49.                         vn = new VideoNews();  
50.                         Integer id = Integer.valueOf(pullParser.getAttributeValue(0));  
51.                         vn.setId(id);  
52.                     }  
53.                     if ("title".equals(nodeName))  
54.                     {  
55.                         String title = pullParser.nextText();  
56.                         vn.setTitle(title);  
57.                     }  
58.                     if ("length".equals(nodeName))  
59.                     {  
60.                         Integer length = Integer.valueOf(pullParser.nextText());  
61.                         vn.setTimeLength(length);  
62.                     }  
63.                     break;  
64.                 // 标签结束  
65.                 case XmlPullParser.END_TAG:  
66.                     if ("news".equals(nodeName))  
67.                     {  
68.                         lst.add(vn);  
69.                         vn = null;  
70.                     }  
71.                     break;  
72.             }  
73.             // 下一个标签  
74.             event = pullParser.next();  
75.         }  
76.         return lst;  
77.     }  
78. } 

最后把得到的数据绑定到ListView中即可。

本文转自IT徐胖子的专栏博客51CTO博客，原文链接http://blog.51cto.com/woshixy/1088051如需转载请自行联系原作者

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