Android網絡編程之獲取網絡上的XML
請尊重他人的勞動成果，轉載請注明出處：Android網絡編程之獲取網絡上的XML
為要獲取網絡上的XML所以需要服務器端提供的支持。
一、創建服務器端：
服務器端項目結構：
服務器端運行效果圖：
第一步：創建業務所需的JavaBean
package com.jph.server.model;
import java.util.Date;
/**
* 新聞實體類
* @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：創建業務邏輯接口和具體實現類
業務接口：
package com.jph.server.service;
import java.util.List;
import com.jph.server.model.News;
public interface XMLService {
/**
* 獲取最新的資訊
* @return
*/
public List getLastNews();
}
業務接口的實現類：
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 {
/**
* 獲取最新的視頻資訊
* @return
*/
public List getLastNews(){
List newes = new ArrayList();
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：創建控制器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;
/**
* 負責響應客戶端的請求: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 newes = newsService.getLastNews();//獲取最新的視頻資訊
request.setAttribute("newes", newes);
//將客戶端的請求轉向news.jsp頁面
request.getRequestDispatcher("/WEB-INF/page/news.jsp").forward(request, response);
}
}
第四步：使用jstl標簽生成XML文件
因此需要使用jstl標簽所以需要將jstl.jar與standard.jar兩個jar包導入項目中。
使用jstl標簽在jsp頁面生成XML:
news.jsp頁面：
<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
${news.title}
${news.publishDate}
至此服務器端項目已經完成。下面開始創建Android端項目。
二、創建Android端：
Android端項目結構：
第一步：創建業務所需的JavaBean
提示：因為服務器端和Android端項目都是用Java語言實現的，所以一些組件可以共用，JavaBean便是其中之一。此時我們在搭建Android端項目的時候，完全可以將服務器端項目中JavaBean拿來用。
第二步：創建Android端項目的業務邏輯層
核心代碼：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;
/**
* 獲取網絡上的xml,並解析
* @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;
}
/**
* 獲取網絡上的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);//設置連接超時
conn.setRequestMethod("GET");
if (conn.getResponseCode()==200) {
InputStream inputStream=conn.getInputStream();
List listNews=pullXml(inputStream);
if (listNews.size()>0) {//如果解析結果不為空則將解析出的數據發送給UI線程
Message msg=new Message();
msg.obj=listNews;
msg.what=PARSESUCCWSS;
handler.sendMessage(msg);
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}//和服務器建立連接
}
}).start();
}
/**
* 解析Xml,並將其封裝成
* @param inputStream
*/
protected List pullXml(InputStream inputStream) {
ListlistNews=new ArrayList();
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)) {//處理news的開始節點
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)) {//處理news的結束節點
listNews.add(news);
}
break;
}
eventCode=pullParser.next();//解析下一個節點（開始節點，結束節點）
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listNews;
}
}
第三步：創建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;
/**
* 獲取網絡上的xml
* @author jph
* Date:2014.09.26
*/
public class MainActivity extends Activity {
private ListlistNews;
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) 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();
}
/**
* 將解析後的xml填充到ListView
*/
protected void initData() {
// TODO Auto-generated method stub
List>items=new ArrayList>();
for (News news:listNews) {
Mapitem=new HashMap();
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端項目已經完成了。下面就讓我們看一下APP運行效果吧：
Android運行效果圖：
