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
- /**
- * 新闻业务类
- *
- * @author 徐越
- *
- */
- public class VideoNewsServiceImpl implements VideoNewsService
- {
- public List<VideoNews> readNews()
- {
- List<VideoNews> lst = new ArrayList<VideoNews>();
- lst.add(new VideoNews(1, "喜洋洋", 20));
- lst.add(new VideoNews(2, "变形金刚", 10));
- lst.add(new VideoNews(3, "功夫熊猫", 20));
- return lst;
- }
- }
- /**
- * 新闻Servlet
- *
- * @author 徐越
- *
- */
- public class ListServlet extends HttpServlet
- {
- private static final long serialVersionUID = 1L;
- private VideoNewsService vs = new VideoNewsServiceImpl();
- protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
- {
- doPost(request, response);
- }
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
- {
- List<VideoNews> news = vs.readNews();
- request.setAttribute("xmlnews", news);
- request.getRequestDispatcher("/WEB-INF/pages/newsxml.jsp").forward(request, response);
- }
- }
- <%@ 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"?>
- <videoNews>
- <c:forEach items="${xmlnews}" var="n">
- <news id="${n.id }">
- <title>${n.title }</title>
- <length>${n.timeLength }</length>
- </news>
- </c:forEach>
- </videoNews>
Android项目
- public class VideoNewsServiceImpl implements VideoNewsService
- {
- /**
- * 获取最新视频资讯,从XML文件中,比较常用
- */
- public List<VideoNews> getNewsFromXML() throws Exception
- {
- List<VideoNews> lst = new ArrayList<VideoNews>();
- String path = "http://xxx.xxx.xxx.xxx:8080/web/ListServlet";
- URL url = new URL(path);
- HttpURLConnection conn = (HttpURLConnection) url.openConnection();
- conn.setReadTimeout(5000);
- conn.setRequestMethod("GET");
- if (200 == conn.getResponseCode())
- {
- InputStream instream = conn.getInputStream();
- lst = parseXML(instream);
- }
- return lst;
- }
- /**
- * 解析XML
- */
- private List<VideoNews> parseXML(InputStream instream) throws Exception
- {
- List<VideoNews> lst = null;
- VideoNews vn = null;
- // 利用ANDROID提供的API快速获得pull解析器
- XmlPullParser pullParser = Xml.newPullParser();
- // 设置需要解析的XML数据
- pullParser.setInput(instream, "UTF-8");
- // 取得事件
- int event = pullParser.getEventType();
- // 若为解析到末尾,文档结束
- while (event != XmlPullParser.END_DOCUMENT)
- {
- String nodeName = pullParser.getName();
- switch (event)
- {
- // 文档开始
- case XmlPullParser.START_DOCUMENT:
- lst = new ArrayList<VideoNews>();
- break;
- // 标签开始
- case XmlPullParser.START_TAG:
- if ("news".equals(nodeName))
- {
- vn = new VideoNews();
- Integer id = Integer.valueOf(pullParser.getAttributeValue(0));
- vn.setId(id);
- }
- if ("title".equals(nodeName))
- {
- String title = pullParser.nextText();
- vn.setTitle(title);
- }
- if ("length".equals(nodeName))
- {
- Integer length = Integer.valueOf(pullParser.nextText());
- vn.setTimeLength(length);
- }
- break;
- // 标签结束
- case XmlPullParser.END_TAG:
- if ("news".equals(nodeName))
- {
- lst.add(vn);
- vn = null;
- }
- break;
- }
- // 下一个标签
- event = pullParser.next();
- }
- return lst;
- }
- }
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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