Android(安卓)定时到服务器取数据并刷新

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Test extends Activity implements Runnable{

/** Called when the activity is first created. */     private Button btn_get = null;     private Button btn_post = null;     private TextView tv_rp = null; @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     btn_get = (Button) this.findViewById(R.id.Button01);     btn_post = (Button) this.findViewById(R.id.Button02);     tv_rp = (TextView) this.findViewById(R.id.TextView);     btn_get.setOnClickListener(new Button.OnClickListener(){                     public void onClick(View v) {                             // TODO Auto-generated method stub                             String httpUrl = "http://192.168.0.132:8080/Android/httpreq.jsp?par=request-get";                             HttpGet request = new HttpGet(httpUrl);                             HttpClient httpClient = new DefaultHttpClient();                             try {                                     HttpResponse response = httpClient.execute(request);                                     if(response.getStatusLine().getStatusCode()==HttpStatus.SC_OK){                                             String str = EntityUtils.toString(response.getEntity());                                             tv_rp.setText(str);                                     }else{                                             tv_rp.setText("请求错误");                                     }                             } catch (ClientProtocolException e) {                                     // TODO Auto-generated catch block                                     e.printStackTrace();                                    } catch (IOException e) {                                     // TODO Auto-generated catch block                                     e.printStackTrace();                             }                     }     });     btn_post.setOnClickListener(new Button.OnClickListener(){                     public void onClick(View v) {                             // TODO Auto-generated method stub                             String httpUrl = "http://192.168.0.132:8080/Android/httpreq.jsp";                             HttpPost request = new HttpPost(httpUrl);                             List<namevaluepair> params = new ArrayList<namevaluepair>();                             params.add(new BasicNameValuePair("par","request-post"));                             try {                                     HttpEntity entity = new UrlEncodedFormEntity(params, "UTF-8");                                     request.setEntity(entity);                                     HttpClient client = new DefaultHttpClient();                                     HttpResponse response = client.execute(request);                                     if(response.getStatusLine().getStatusCode()==HttpStatus.SC_OK){                                             String str = EntityUtils.toString(response.getEntity());                                             tv_rp.setText(str);                                     }else{                                             tv_rp.setText("请求错误");                                     }                             } catch (UnsupportedEncodingException e) {                                     // TODO Auto-generated catch block                                     e.printStackTrace();                             } catch (ClientProtocolException e) {                                     // TODO Auto-generated catch block                                     e.printStackTrace();                             } catch (IOException e) {                                     // TODO Auto-generated catch block                                     e.printStackTrace();                             }                     }     });     new Thread(this).start(); } public void refresh(){         String httpUrl = "http://192.168.0.132:8080/Android/httpreq.jsp";         try {                     URL url = new URL(httpUrl);                     HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();                     urlConn.connect();                     InputStream input = urlConn.getInputStream();                     InputStreamReader inputreader = new InputStreamReader(input);                     BufferedReader reader = new BufferedReader(inputreader);                     String str = null;                     StringBuffer sb = new StringBuffer();                     while((str = reader.readLine())!= null){                             sb.append(str).append("\n");                     }                     if(sb != null){                             tv_rp.setText(sb.toString());                     }else{                             tv_rp.setText("NULL");                     }                     reader.close();                     inputreader.close();                     input.close();                     reader = null;                     inputreader = null;                     input = null;             } catch (MalformedURLException e) {                     e.printStackTrace();             } catch (IOException e) {                     // TODO Auto-generated catch block                     e.printStackTrace();             } } public Handler handler = new Handler(){         public void handleMessage(Message msg){                 super.handleMessage(msg);                 refresh();         } };     public void run() {             // TODO Auto-generated method stub             while(true){                     try {                             Thread.sleep(1000);                             handler.sendMessage(handler.obtainMessage());                     } catch (InterruptedException e) {                             // TODO Auto-generated catch block                             e.printStackTrace();                     }             }     }

}

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