Android HttpClient网络通信

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<Button android:text="GET" android:id="@+id/Button01"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content">
	</Button>
	<Button android:text="POST" android:id="@+id/Button02"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content">
	</Button>
	<TextView android:id="@+id/TextView" android:layout_width="fill_parent"
		android:layout_height="wrap_content"/>
</LinearLayout>

package com.Aina.Android;

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();
			}
		}
	}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.Aina.Android"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Test"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

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

</manifest>