04_08_HTTP操作（二）

04_08_HTTP操作（二）

package org.marsdroid.http01;

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

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

public class MainActivity extends Activity {
    private Button requestButton = null;
    private HttpResponse httpResponse = null;
    private HttpEntity httpEntity = null;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        requestButton = (Button)findViewById(R.id.requestButton);
        requestButton.setOnClickListener(new OnClickListener() {

            /*
             * 1、生成一个请求对象HttpGet: httpGet = new HttpGet("")
             * 2、生成一个Http客户端对象：   httpClient = new DefaultHttpClient();
             * 3、使用Http客户端发送请求对象，得到服务器响应： httpResponse = httpClient.execute(httpGet);
             * 4、从服务器响应中得到内容实体：httpEntity = httpResponse.getEntity();
             * 5、从内容实体中得到输入流：inputSream = httpEntity.getContent();
             * 6、把输入流变为读入流： new InputStreamReader(inputStram)
             * 7、把读入流变为读入缓冲 reader=new BufferedReader(new InputStreamReader(inputSteam))
             * 一般是： 输入流InputSteam->读入流InputStreamReader->读缓冲BufferedReader
             * 8、从读缓冲中读字符串数据，每次读一行：line = reader.readLine()*/
            @Override
            public void onClick(View v) {
                //生成一个请求对象
                HttpGet httpGet = new HttpGet("");
                //生成一个Http客户端对象
                HttpClient httpClient = new DefaultHttpClient();
                //使用Http客户端发送请求对象
                InputStream inputStream = null;
                try {
                    httpResponse = httpClient.execute(httpGet);
                    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(Exception e){
                        e.printStackTrace();
                    }
                }
            }
        });
    }
}

别忘了再AndroidMainfest.xml中添加 访问互联网的权限：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=""
      package="org.marsdroid.http01"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="10" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>