Android网络编程之获取网络上的XML

Android网络编程之获取网络上的XML

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为要获取网络上的XML所以需要服务器端提供的支持。

一、创建服务器端：

服务器端项目结构：

服务器端运行效果图：

第一步：创建业务所需的JavaBean

 

package com.jph.server.model;import java.util.Date;/** * 新闻实体类 * @author jph * Date:2014.09.26 */public class News {private Integer id;private String title;private Date publishDate;public News(Integer id, String title, Date publishDate) {this.id = id;this.title = title;this.publishDate = publishDate;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public Date getPublishDate() {return publishDate;}public void setPublishDate(Date publishDate) {this.publishDate = publishDate;}}

第二步：创建业务逻辑接口和具体实现类

业务接口：

 

package com.jph.server.service;import java.util.List;import com.jph.server.model.News;public interface XMLService {/** * 获取最新的资讯 * @return */public List<News> getLastNews();}

业务接口的实现类：

 

package com.jph.server.service.impl;import java.util.ArrayList;import java.util.Date;import java.util.List;import com.jph.server.model.News;import com.jph.server.service.XMLService;public class XMLServiceBean implements XMLService {/** * 获取最新的视频资讯 * @return */public List<News> getLastNews(){List<News> newes = new ArrayList<News>();newes.add(new News(1, "jph", new Date(System.currentTimeMillis()+100002)));newes.add(new News(2, "admin",new Date(System.currentTimeMillis()+330002)));newes.add(new News(3, "tom", new Date(System.currentTimeMillis()+180002)));return newes;}}

第三步：创建控制器Servlet

 

package com.jph.server.xml;import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.jph.server.model.News;import com.jph.server.service.XMLService;import com.jph.server.service.impl.XMLServiceBean;/** * 负责响应客户端的请求:http://xxx/ServerForXML/ServletForXMLServlet */public class ServletForXML extends HttpServlet {private static final long serialVersionUID = 1L;private XMLService newsService = new XMLServiceBean();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> newes = newsService.getLastNews();//获取最新的视频资讯request.setAttribute("newes", newes);//将客户端的请求转向news.jsp页面request.getRequestDispatcher("/WEB-INF/page/news.jsp").forward(request, response);}}

 

第四步：使用jstl标签生成XML文件

因此需要使用jstl标签所以需要将jstl.jar与standard.jar两个jar包导入项目中。

使用jstl标签在jsp页面生成XML:

news.jsp页面：

 

<%@ 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"?><newslist><c:forEach items="${newes}" var="news"><news id="${news.id}"><title>${news.title}</title><publishDate>${news.publishDate}</publishDate></news></c:forEach></newslist>

至此服务器端项目已经完成。下面开始创建Android端项目。

二、创建Android端：

Android端项目结构：

第一步：创建业务所需的JavaBean

提示：因为服务器端和Android端项目都是用Java语言实现的，所以一些组件可以共用，JavaBean便是其中之一。此时我们在搭建Android端项目的时候，完全可以将服务器端项目中JavaBean拿来用。

第二步：创建Android端项目的业务逻辑层

核心代码：GetXmlAndParse.java:

 

package com.jph.gxfi.service;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;import java.util.Date;import java.util.List;import org.xmlpull.v1.XmlPullParser;import com.jph.gxfi.model.News;import android.os.Handler;import android.os.Message;import android.util.Xml;/** * 获取网络上的xml,并解析 * @author jph * Date：2014.09.26 */public class GetXmlAndParse {private String url="http://10.219.61.117:8080/ServerForXML/ServletForXML";public static final int PARSESUCCWSS=0x2001;private Handler handler;public GetXmlAndParse(Handler handler) {// TODO Auto-generated constructor stubthis.handler=handler;}/** * 获取网络上的XML */public void getXml(){new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubtry {HttpURLConnection conn=(HttpURLConnection)new URL(url).openConnection();conn.setConnectTimeout(5000);//设置连接超时conn.setRequestMethod("GET");if (conn.getResponseCode()==200) {InputStream inputStream=conn.getInputStream();List<News> listNews=pullXml(inputStream);if (listNews.size()>0) {//如果解析结果不为空则将解析出的数据发送给UI线程Message msg=new Message();msg.obj=listNews;msg.what=PARSESUCCWSS;handler.sendMessage(msg);}}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}//和服务器建立连接}}).start();}/** * 解析Xml,并将其封装成 * @param inputStream */protected List<News> pullXml(InputStream inputStream) {List<News>listNews=new ArrayList<News>();try {XmlPullParser pullParser=Xml.newPullParser();News news=null;pullParser.setInput(inputStream, "utf-8");int eventCode=pullParser.getEventType();while (eventCode!=XmlPullParser.END_DOCUMENT) {String targetName=pullParser.getName();switch (eventCode) {case XmlPullParser.START_TAG:if ("news".equals(targetName)) {//处理news的开始节点news =new News();news.setId(new Integer(pullParser.getAttributeValue(0)));}else if ("title".equals(targetName)) {news.setTitle(pullParser.nextText());}else if ("publishDate".equals(targetName)) {news.setPublishDate(new Date(pullParser.nextText()));}break;case XmlPullParser.END_TAG:if ("news".equals(targetName)) {//处理news的结束节点listNews.add(news);}break;}eventCode=pullParser.next();//解析下一个节点（开始节点，结束节点）}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return listNews;}}

第三步：创建Activity

 

package com.jph.gxfi.activity;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import com.jph.gxfi.R;import com.jph.gxfi.model.News;import com.jph.gxfi.service.GetXmlAndParse;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.widget.ListView;import android.widget.SimpleAdapter;import android.app.Activity;/** * 获取网络上的xml * @author jph * Date:2014.09.26 */public class MainActivity extends Activity {private List<News>listNews;private ListView list;Handler mHandler=new Handler(){@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubswitch (msg.what) {case GetXmlAndParse.PARSESUCCWSS:listNews=(List<News>) msg.obj;initData();break;}super.handleMessage(msg);}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);list=(ListView)findViewById(R.id.list);GetXmlAndParse getXmlAndParse=new GetXmlAndParse(mHandler);getXmlAndParse.getXml();}/** * 将解析后的xml填充到ListView */protected void initData() {// TODO Auto-generated method stubList<Map<String, Object>>items=new ArrayList<Map<String,Object>>();for (News news:listNews) {Map<String, Object>item=new HashMap<String, Object>();item.put("id", news.getId());item.put("title", news.getTitle());item.put("time", convertDate(news.getPublishDate()));items.add(item);}SimpleAdapter adapter=new SimpleAdapter(this, items, R.layout.line, new String[]{"id","title","time"}, new int[]{R.id.tvId,R.id.tvTitle,R.id.tvTime});list.setAdapter(adapter);}private String convertDate(Date publishDate) {// TODO Auto-generated method stubSimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");return sdf.format(publishDate);}}

 

至此Android端项目已经完成了。下面就让我们看一下APP运行效果吧：

Android运行效果图：