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                [Android網絡編程之獲取網絡上的XML](http://blog.csdn.net/fengyuzhengfan/article/details/39589307) **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?](http://blog.csdn.net/fengyuzhengfan/article/details/39589307)** 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: ![服務器端項目結構](https://box.kancloud.cn/2016-02-19_56c6aa37bf714.jpg) 服務器端運行效果圖: ![獲取網上的XML服務器端運行效果圖](https://box.kancloud.cn/2016-02-19_56c6aa37d2e6a.jpg) ### 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<News> 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<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: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<News> 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"%><?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: ![Android端項目結構](https://box.kancloud.cn/2016-02-19_56c6aa37e7d48.jpg) ### 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,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; } /** * 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<News> 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,并將其封裝成 * @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)) {//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 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(); } /** * 將解析后的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: ![獲取網上的XML Android端運行效果圖](https://box.kancloud.cn/2016-02-19_56c6aa38080a8.jpg)
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