android访问web工程，并解析web工程返回的xml文件

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android访问web工程，并解析web工程返回的xml文件

2014年01月24日 ⁄ 综合 ⁄ 共 10653字 ⁄ 字号小中大 ⁄ 评论关闭

如题：

首先建立一个简单的web工程，使用servlet技术：

下面是servlet的实现。

/**
 * @FILE:ListServlet.java
 * @AUTHOR:Administrator
 * @DATE:2013-5-19 下午6:03:19
 **/
package com.yehui.servlet;

import java.io.IOException;
import java.io.PrintWriter;
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.yehui.service.VideoNewsService;
import com.yehui.service.bean.News;
import com.yehui.service.impl.VideoNewsServiceImpl;

/*******************************************
 * 
 * @CLASS:ListServlet
 * @DESCRIPTION:
 * @AUTHOR:Administrator
 * @VERSION:v1.0
 * @DATE:2013-5-19 下午6:03:19
 *******************************************/
public class ListServlet extends HttpServlet {
	private VideoNewsService service = new VideoNewsServiceImpl();

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);

	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		List<News> videos = service.getLastNews();
		request.setAttribute("videos", videos);
		// ("")里面是jsp的文件路径
		request.getRequestDispatcher("/WEB-INF/page/videonews.jsp").forward(request, response);
	}

}

web的service操作的bean：News：

/**
 * @FILE:News.java
 * @AUTHOR:Administrator
 * @DATE:2013-5-19 下午6:08:00
 **/
package com.yehui.service.bean;

/*******************************************
 * 
 * @CLASS:News
 * @DESCRIPTION:
 * @AUTHOR:Administrator
 * @VERSION:v1.0
 * @DATE:2013-5-19 下午6:08:00
 *******************************************/
public class News {
	private Integer id;
	private String title;
	private Integer timelength;

	public News() {
	}

	public News(Integer id, String title, Integer timelength) {
		this.id = id;
		this.title = title;
		this.timelength = timelength;
	}

	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 Integer getTimelength() {
		return timelength;
	}

	public void setTimelength(Integer timelength) {
		this.timelength = timelength;
	}

}

web的service接口：

/**
 * @FILE:VideoNewsService.java
 * @AUTHOR:Administrator
 * @DATE:2013-5-19 下午6:14:18
 **/
package com.yehui.service;

import java.util.List;

import com.yehui.service.bean.News;

/*******************************************
 * 
 * @CLASS:VideoNewsService
 * @DESCRIPTION:	
 * @AUTHOR:Administrator
 * @VERSION:v1.0
 * @DATE:2013-5-19 下午6:14:18
 *******************************************/
public interface VideoNewsService {

	/**@description:获取最新的视频资讯	
	 * @author:Administrator
	 * @return:List<News>
	 */
	
	public List<News> getLastNews();

}

service的实现：

/**
 * @FILE:VideoNewsServiceImpl.java
 * @AUTHOR:Administrator
 * @DATE:2013-5-19 下午6:06:33
 **/
package com.yehui.service.impl;

import java.util.ArrayList;
import java.util.List;

import com.yehui.service.VideoNewsService;
import com.yehui.service.bean.News;

/*******************************************
 * 
 * @CLASS:VideoNewsServiceImpl
 * @DESCRIPTION:	
 * @AUTHOR:Administrator
 * @VERSION:v1.0
 * @DATE:2013-5-19 下午6:06:33
 *******************************************/
public class VideoNewsServiceImpl implements VideoNewsService {
public List<News> getLastNews(){
	List<News> newes=new ArrayList<News>();
	newes.add(new News(1,"喜洋洋",90));
	newes.add(new News(2,"灰太狼",30));
	newes.add(new News(3,"泷泽萝拉",10));
	return newes;
}
}

jsp文件，这里注意是要返回xml的结果：所以文件的第一行必须加上<?xml version="1.0" encoding="UTF-8"?>

<%@ page language="java" contentType="text/xml; charset=UTF-8" import="java.util.*" pageEncoding="utf-8"%><?xml version="1.0" encoding="UTF-8"?>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<videonews >
    <c:forEach items="${videos}" var="video"  >
	<news id="${video.id}">
	<title>${video.title}</title>
	<timelength>${video.timelength}</timelength>
	</news>
	</c:forEach>
</videonews>

web.xml文件配置servlet:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>ListServlet</servlet-name>
    <servlet-class>com.yehui.servlet.ListServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>ListServlet</servlet-name>
    <url-pattern>/ListServlet</url-pattern>
  </servlet-mapping>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

好了，web服务器端已经构建成功。下面介绍android客户端：

依然为service操作的bean:

/**
 * @FILE:News.java
 * @AUTHOR:Administrator
 * @DATE:2013-5-19 下午6:08:00
 **/
package com.yehui.bean;

/*******************************************
 * 
 * @CLASS:News
 * @DESCRIPTION:
 * @AUTHOR:Administrator
 * @VERSION:v1.0
 * @DATE:2013-5-19 下午6:08:00
 *******************************************/
public class News {
	private Integer id;
	private String title;
	private Integer timelength;

	public News() {
	}

	public News(Integer id, String title, Integer timelength) {
		this.id = id;
		this.title = title;
		this.timelength = timelength;
	}

	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 Integer getTimelength() {
		return timelength;
	}

	public void setTimelength(Integer timelength) {
		this.timelength = timelength;
	}

}

service:通过pull技术对返回的xml文件内容进行解析：

/**
 * @FILE:VideoNewsService.java
 * @AUTHOR:Administrator
 * @DATE:2013-5-19 下午8:29:22
 **/
package com.yehui.service;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;



import android.util.Xml;

import com.yehui.bean.News;

/*******************************************
 * 
 * @CLASS:VideoNewsService
 * @DESCRIPTION:
 * @AUTHOR:Administrator
 * @VERSION:v1.0
 * @DATE:2013-5-19 下午8:29:22
 *******************************************/
public class VideoNewsService {
	public static List<News> getLastNews() throws Exception {
		List<News> newes = new ArrayList<News>();
		URL url = new URL("http://169.254.161.54:8888/web/ListServlet");
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setRequestMethod("GET");
		conn.setConnectTimeout(5000);
		conn.connect();
		if (conn.getResponseCode() == 200) {
			InputStream inputStream = conn.getInputStream();
			// 因为页面返回值是xml文件，所以现在就要解析这个xml,使用pull解析器解析
			
			newes= parseXML(inputStream);

		}
		return newes;
	}

	/**
	 * @description:pull解析服务器返回xml文件
	 * @author:Administrator
	 * @return:List<News>
	 * @param inputStream
	 * @return
	 * @throws XmlPullParserException
	 * @throws IOException
	 */

	private static List<News> parseXML(InputStream inputStream)
			throws Exception {
		XmlPullParser xmlPullParser = Xml.newPullParser();
		xmlPullParser.setInput(inputStream, "utf-8");
		int event = xmlPullParser.getEventType();
		List<News> newes = new ArrayList<News>();
		News news = null;
		while (event != xmlPullParser.END_DOCUMENT) {
			switch (event) {
			case 2:
				if ("news".equals(xmlPullParser.getName())) {
					int id = Integer
							.valueOf(xmlPullParser.getAttributeValue(0));
					news = new News();
					news.setId(id);
				} else if ("title".equals(xmlPullParser.getName())) {
					news.setTitle(xmlPullParser.nextText());
				} else if ("timelength".equals(xmlPullParser.getName())) {
					news.setTimelength(Integer.valueOf(xmlPullParser.nextText()));
				}
				break;
			case 3:
				if ("news".equals(xmlPullParser.getName())) {
					newes.add(news);
					news = null;
				}
				break;
				default:
					break;
					
			}
			
			event = xmlPullParser.next();
		}
		return newes;
	}
}

activity中使用线程调用service,从而更新UI

package com.yehui.news;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.yehui.bean.News;
import com.yehui.service.VideoNewsService;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
	ListView listview;
	private Handler handler = new Handler() {
		

		@Override
		public void handleMessage(Message msg) {
			try {
				List<News> newes = (List<News>) msg.obj;

				List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
				for (News news : newes) {
					HashMap<String, Object> item = new HashMap<String, Object>();
					item.put("title", news.getTitle());
					item.put("timelength", news.getTimelength());
					data.add(item);
				}
				SimpleAdapter simpleAdapter = new SimpleAdapter(
						getApplicationContext(), data, R.layout.item,
						new String[] { "title", "timelength" }, new int[] {
								R.id.title, R.id.timelength });
				listview.setAdapter(simpleAdapter);
			} catch (Exception e) {
				e.printStackTrace();
				Toast.makeText(getApplicationContext(), R.string.error, 1)
						.show();
			}
		}

	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		listview = (ListView) this.findViewById(R.id.listview);
		new Thread() {

			@Override
			public void run() {
				List<News> newes;
				try {
					newes = VideoNewsService.getLastNews();
					Message msg = new Message();
					msg.obj = newes;
					handler.sendMessage(msg);
				} catch (Exception e) {
					e.printStackTrace();
				}

			}

		}.start();

	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

layout文件，因为显示的时候用到了listview，所以这里对listview的行布局文件也列出

listview布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </ListView>

</LinearLayout>

listview的行布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/title"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/timelength"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

最后将访问网络的权限加入到清单文件中：

<uses-permission android:name="android.permission.INTERNET"/>

至此完成：感谢智客的视频。

【上篇】Log4j的使用。
【下篇】java读取Oracle中Clob字段

作者: revamp

该日志由 revamp 于10年前发表在综合分类下，最后更新于 2014年01月24日.
转载请注明: android访问web工程，并解析web工程返回的xml文件 | 学步园 +复制链接

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android访问web工程，并解析web工程返回的xml文件

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