使用HttpClient请求一个网页

package com.exp.httpdemo;

import java.io.InputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

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

/**
 * 使用HttpClient请求一个网页
 *
 */
public class MainActivity extends Activity {
    TextView tvResult;
    String url="http://www.baidu.com";
    Handler handler = new Handler();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        tvResult=(TextView)findViewById(R.id.textView1);
    }

    public void ClickButton(View view){
        new Thread(new Runnable() {
            
            @Override
            public void run() {
                // 获取HttpClient对象
                HttpClient httpClient = new DefaultHttpClient();
                // 获取HttpGet对象
                HttpGet requestGet = new HttpGet(url);
                try {
                    // 获取响应结果
                    HttpResponse httpResponse = httpClient.execute(requestGet);
                    if (httpResponse.getStatusLine().getStatusCode() == 200) {
                        // 从响应中取出实体类
                        HttpEntity httpEntity = httpResponse.getEntity();
                        final String result=EntityUtils.toString(httpEntity);
                        // 如果想通过IO流来读写可以使用getContent方法获取
                        //InputStream in = httpEntity.getContent();
                        handler.post(new Runnable() {
                            
                            @Override
                            public void run() {
                                tvResult.setText(result);
                            }
                        });
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    
                }
            }
        }).start();
        
    
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}