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Android网络编程之获取网络上的XML

栏目:综合技术时间:2014-09-30 00:36:50

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:

服务器端项目结构

服务器端运行效果图:

获取网上的XML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:

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 stub this.handler=handler; } /** * 获取网络上的XML */ public void getXml(){ new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub try { 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 block e.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 block e.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(){ @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub switch (msg.what) { case GetXmlAndParse.PARSESUCCWSS: listNews=(List<News>) msg.obj; initData(); break; } super.handleMessage(msg); } }; @Override protected 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 stub List<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 stub SimpleDateFormat 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:

获取网上的XML Android端运行效果图

 

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