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();
            }
        }
        
    }
}