Http操作

1.新建一个MainActivity的类

package wei.cao.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

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

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

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
	private Button requestButton=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        requestButton=(Button)this.findViewById(R.id.requestButton);
        requestButton.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				  System.out.println("onClick");
				  requestButton.setText("hahhaha");
				// TODO Auto-generated method stub
				
				//生成一个请求对象
				HttpGet httpGet=new HttpGet("http://www.baidu.com");
				//生成一个Http客户端对象
				HttpClient httpClient=new DefaultHttpClient();
				
				InputStream inputStream=null;
				
				try {
					//使用Http客户端发送请求
				    HttpResponse httpResponse=httpClient.execute(httpGet);
				    HttpEntity httpEntity=httpResponse.getEntity();
				    inputStream=httpEntity.getContent();
				    BufferedReader reader=new BufferedReader(new InputStreamReader(inputStream));
				    String result="";
				    String line="";
				    while((line=reader.readLine())!=null)
				    {
				    	result=result+line;
				    }
				 
				    System.out.println(result);
				   
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}finally
				{
			
					try {
						 inputStream.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
				
			}
		});
    }
}