ANDROID_MARS学习笔记_S04_003_用HttpClent发http请求

一、代码

1.xml
(1)activity_main.xml

     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="发送Http请求"
         android:onClick="sendHttpRequest" />
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="发送Http请求"
         android:onClick="sendHttpRequest" />

 </LinearLayout>

(2)AndroidManifest.xml

增加

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

2.java
(1)MainActivity.java

 package com.http;

 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.annotation.SuppressLint;
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.StrictMode;
 import android.view.View;

 @SuppressLint("NewApi")
 public class MainActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         if (android.os.Build.VERSION.SDK_INT > 9) {
             StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
             StrictMode.setThreadPolicy(policy);
         }
     }

     public void sendHttpRequest(View view) {
         System.out.println("sendHttpRequest---->");
         //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;
         //使用Http客户端发送请求对象
         try {
             HttpResponse httpResponse = httpClient.execute(httpGet);
             HttpEntity httpEntity = httpResponse.getEntity();
             inputStream = httpEntity.getContent();
             BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
             String line = null;
             StringBuilder sb = new StringBuilder();
             while ((line = reader.readLine()) != null) {
                 sb.append(line);
             }
             System.out.println(sb);
         } catch (ClientProtocolException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             try {
                 inputStream.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }

     }
 }