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:

Android网络编程之获取网络上的XML_第1张图片

服务器端运行效果图:

Android网络编程之获取网络上的XML_第2张图片

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网络编程之获取网络上的XML_第3张图片

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:

Android网络编程之获取网络上的XML_第4张图片

 

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