Android进阶2之Http操作访问网络

操作步骤：

<1>

生成请求对象

HttpGet httpGet = new HttpGet("请求地址。。。。。");

<2>

生成客户端对象

HttpClient httpClient = new DefaultHttpClient();

<3>

执行请求

HttpResponse httpResponse = httpClient.execute(httpGet);

<4>

接受响应

HttpEntity httpEntity = httpResponse.getEntity();

<5>得到数据流

InputStream inputStream = httpEntity.getContent();

注意：

要添加权限： <uses-permission android:name="android.permission.INTERNET" />

具体实现：

package xiaosi.httpResponse;

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

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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class HttpResponseActivity extends Activity
{
 private Button   button   = null;
 private TextView  text   = null;
 private HttpResponse httpResponse = null;
 private HttpEntity  httpEntity  = null;

 @Override
 public void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  text = (TextView) findViewById(R.id.text);
  button = (Button) findViewById(R.id.button);
  button.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v)
   {
    // 生成一个请求对象，参数就是地址
    HttpGet httpGet = new HttpGet("http://www.baidu.com");
    // 生成Http客户端
    HttpClient httpClient = new DefaultHttpClient();
    InputStream inputStream = null;
    // 使用HTTP客户端发送请求对象
    try
    {
     // 发送请求的响应
     httpResponse = httpClient.execute(httpGet);
     // 代表接收的http消息，服务器返回的消息都在httpEntity
     httpEntity = httpResponse.getEntity();
     if(httpResponse.getStatusLine().getStatusCode() == 200){
      inputStream = httpEntity.getContent();
      BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
      String result = "";
      String line = "";
      while ((line = reader.readLine()) != null)
      {
       result = result + line;
      }
      
      text.setText(result);
     }
    }
    catch (ClientProtocolException e)
    {
     e.printStackTrace();
    }
    catch (Exception e)
    {
     e.printStackTrace();
    }
    finally
    {
     try
     {
      inputStream.close();
     }
     catch (IOException e)
     {
      e.printStackTrace();
     }
    }
   }
  });
 }
}