Android 通过GET请求利用pull解析器获取XML格式数据在ListView控件显示

来源：互联网发布：淘宝申请定向计划编辑：程序博客网时间：2024/05/22 12:41

（1）创建实体类News

public class News {    private Integer id;    private String title;    private Integer timelength;    public News(Integer id, String title, Integer timelength) {        this.id = id;        this.title = title;        this.timelength = timelength;    }    //get、set方法}1
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（2）面向接口编程所创建的接口可接口的实现类：

public interface VideoNewsService {    /**     * 获取最新的视频资讯     * @return     */    public List<News> getLastNews();}1
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接口的实现类，用于加入一些假数据

public class VideoNewsServiceBean implements VideoNewsService {    public List<News> getLastNews(){        List<News> newes = new ArrayList<News>();        newes.add(new News(90, "喜羊羊与灰太狼全集", 78));        newes.add(new News(10, "实拍舰载直升东海救援演习", 28));        newes.add(new News(56, "喀麦隆VS荷兰", 70));        return newes;    }}1
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（3）通过servlet返回数据大客户端

public class ListServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    private VideoNewsService service = new VideoNewsServiceBean();    protected void doGet(HttpServletRequest request,            HttpServletResponse response) throws ServletException, IOException {        doPost(request, response);    }    protected void doPost(HttpServletRequest request,            HttpServletResponse response) throws ServletException, IOException {        List<News> videos = service.getLastNews();        request.setAttribute("videos", videos);        //重定向一个jsp界面，当客户端请求的时候返回的是该jsp页面数据        request.getRequestDispatcher("/WEB-INF/page/videonews.jsp").forward(request, response);    }}1
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（4）生成xml文件的jsp页面（这里返回的为xml文件所以contentType=”text/xml”）

<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><?xml version="1.0" encoding="UTF-8"?><videonews><c:forEach items="${videos}" var="video">    <news id="${video.id}">        <title>${video.title}</title>        <timelength>${video.timelength}</timelength>    </news>    </c:forEach></videonews>1
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（5）在客户端中使用xml文件
同样的客户端同样需要一个News实体类，这里省略
创建一个service类用于解析xml和返回xml文件数据

public class VideoNewsService {    /**     * 获取最新的视频资讯     */    public static List<News> getLastNews() throws Exception{        String path = "请求servlet的url";        URL url = new URL(path);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        conn.setConnectTimeout(5000);        conn.setRequestMethod("GET");        if(conn.getResponseCode() == 200){            InputStream inStream = conn.getInputStream();            return parseXML(inStream);        }        return null;    }    /**     * 解析服务器返回的xml数据<?xml version="1.0" encoding="UTF-8" ?> <videonews>  <news id="35">  <title>喜羊羊与灰太狼全集</title>   <timelength>90</timelength>   </news> <news id="12">  <title>老张与灰太狼</title>   <timelength>20</timelength>   </news> <news id="56">  <title>老方与LILI</title>   <timelength>30</timelength>   </news></videonews>     */    private static List<News> parseXML(InputStream inStream) throws Exception {        List<News> newses = new ArrayList<News>();        News news = null;        XmlPullParser parser = Xml.newPullParser();        parser.setInput(inStream, "UTF-8");        int event = parser.getEventType();        //对xml解析器的事件进行判断        while( event != XmlPullParser.END_DOCUMENT){            switch (event) {            case XmlPullParser.START_TAG:                if("news".equals(parser.getName())){                    int id = new Integer(parser.getAttributeValue(0));                    news = new News();                    news.setId(id);                }else if("title".equals(parser.getName())){                    news.setTitle(parser.nextText());                }else if("timelength".equals(parser.getName())){                    news.setTimelength(new Integer(parser.nextText()));                }                break;            case XmlPullParser.END_TAG:                if("news".equals(parser.getName())){                    newses.add(news);                    news = null;                }                break;            }            event = parser.next();        }        return newses;    }}1
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（6）在Mainactivity.Java文件中使用（这里是为一个listview设置值）

public class MainActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        ListView listView = (ListView) this.findViewById(R.id.listView);        try {            List<News> videos = VideoNewsService.getLastNews();//需修改成你本机的Http请求路径            List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();            for(News news : videos){                HashMap<String, Object> item = new HashMap<String, Object>();                item.put("id", news.getId());                item.put("title", news.getTitle());                item.put("timelength", getResources().getString(R.string.timelength)                        + news.getTimelength()+ getResources().getString(R.string.min));                data.add(item);            }            SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,                    new String[]{"title", "timelength"}, new int[]{R.id.title, R.id.timelength});            listView.setAdapter(adapter);        } catch (Exception e) {            e.printStackTrace();        }    }}1
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到此完成操作

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