獲取web服務器xml數據

 

實驗步驟：

1、 配置J2EE開發環境，並部署web應用viderweb，啓動服務

2、 打開瀏覽器訪問網址

http://localhost:8080/videoweb/video/list.do

演示xml數據

3、 創建android客戶端工程，實現訪問上面的網址並且將取得的xml數據進行解析並顯示，如下圖：

Android客戶端代碼

程序流程

 

資源

<resources>  
    <string name="app_name">視頻資訊客戶端</string>  

    <string name="error">網絡連接失敗</string>  

</resources>  

佈局

main.xml

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

    android:layout_width="fill_parent"  

    android:layout_height="fill_parent"  

    android:orientation="vertical" >  

   

    <ListView  

        android:id="@+id/listView"  

        android:layout_width="fill_parent"  

        android:layout_height="fill_parent" />  

   

</LinearLayout>  

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

    android:layout_width="fill_parent"  

    android:layout_height="wrap_content"  

    android:orientation="horizontal" >  

   

    <TextView  

        android:id="@+id/title"  

        android:layout_width="250dip"  

        android:layout_height="wrap_content" />  

   

    <TextView  

        android:id="@+id/timelength"  

        android:layout_width="fill_parent"  

        android:layout_height="wrap_content" />  

   

</LinearLayout>  

item.xml

添加業務bean類Video

package cn.class3g.domain;  
   

public class Video {  

    private Integer id;  

    private String title;  

    private Integer timelength;  

   

    public Video(Integer id, String title, Integer timelength) {  

       super();  

       this.id = id;  

       this.title = title;  

       this.timelength = timelength;  

    }  

    public Video() {  }  

    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;  

    }  

    public String toString() {  

       return "Video [id=" + id + ", title=" + title + ", timelength="  

              + timelength + "]";  

    }  

}  

添加業務類VideoService類 

public class VideoService {  

   

    /**  

     * 從服務器獲取最新的視頻資訊  

     *  

     * @return  

     * @throws Throwable  

     */  

    public static List<Video> getLastVideos() throws Throwable {  

       String path =  

"http://192.168.1.102:8080/videoweb/video/list.do";  

       URL url = new URL(path);  

       HttpURLConnection conn = (HttpURLConnection) url.openConnection();  

       conn.setConnectTimeout(5 * 1000);  

       conn.setRequestMethod("GET");  

       InputStream inStream = conn.getInputStream();  

       return parseXML(inStream);  

    }  

   

    private static List<Video> parseXML(InputStream inStream) throws Exception {  

       Video video = null;  

       List<Video> videos = null;  

       XmlPullParser pullParser = Xml.newPullParser();  

       pullParser.setInput(inStream, "UTF-8");  

        

       int event = pullParser.getEventType();// 觸發第一個事件  

        

       while (event != XmlPullParser.END_DOCUMENT) {  

           switch (event) {  

           case XmlPullParser.START_DOCUMENT:  

              videos = new ArrayList<Video>();  

              break;  

           case XmlPullParser.START_TAG:  

              if ("video".equals(pullParser.getName())) {  

                  int id = new Integer(pullParser.getAttributeValue(0));  

                  video = new Video();  

                  video.setId(id);  

              }  

              if (video != null) {  

                  if ("title".equals(pullParser.getName())) {  

                     video.setTitle(pullParser.nextText());  

                  }  

                  if ("timelength".equals(pullParser.getName())) {  

                     video.setTimelength(new Integer(pullParser.nextText()));  

                  }  

              }  

              break;  

   

           case XmlPullParser.END_TAG:  

              if ("video".equals(pullParser.getName())) {  

                  videos.add(video);  

                  video = null;  

              }  

              break;  

           }  

           event = pullParser.next();  

       }  

       return videos;  

    }  

}  

Activity類MyVideoNewsActivity

public class MyVideoNewsActivity extends Activity {  
   

    public void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.main);  

         

        try {  

           List<Video> videos = VideoService.getLastVideos();//獲取最新視頻資訊  

           ListView listView = (ListView)this.findViewById(R.id.listView);  

           List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();  

           for(Video video : videos){  

              HashMap<String, Object> item = new HashMap<String, Object>();  

              item.put("title", video.getTitle());  

              item.put("timelength", "時長:"+video.getTimelength());  

              item.put("id", video.getId());  

              data.add(item);  

           }  

           SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,  

                  new String[]{"title","timelength"}, new int[]{R.id.title, R.id.timelength});  

           listView.setAdapter(adapter);  

       } catch (Throwable e) {  

           Log.e("TAG", e.toString());  

           Toast.makeText(this, R.string.error, 1).show();  

       }     

    }  

}