Android MediaPlayer与Http Proxy结合之基础篇

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！      

       最近半年都忙着Android TV项目，在春节假期才有时间写点东西。先在这里给大家拜个年，祝大家龙年快乐...

       直接进入主题：本文将会教大家如何实现一个简单的代理服务器(仅支持Http Get)，与Android的MediaPlayer结合，从而可以扩展出“播放 防盗链的媒体文件”，“边播放边保存”等的功能。

       本文的代码可以到这里下载：http://download.csdn.net/detail/hellogv/4047134，代码分为两个工程：

1. J2SE工程：HttpGetProxy，在PC上实现简单的代理服务器，核心类是HttpGetProxy.java，非常容易使用，这里就不唠叨了直接贴出运行效果图：
2. Android工程：本文重点，必须唠叨一下。MediaPlayer播放网络音频（http://blog.csdn.net/hellogv/article/details/6406732）与HttpGetProxy.java结合，通过代理服务器播放网络音频。

   接下来贴出HttpGetProxy.java的原理图：

 接下来贴出HttpGetProxy.java的源码：

通过RemoteSocket的out_remoteSocket可以访问防盗链资源，HttpGetProxy通过2个线程来实现转发，可以在两个线程内实现保存的功能。

 <span style="font-family:Comic Sans MS;font-size:18px;">package com.musicplayer;

 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.SocketAddress;
 import java.net.UnknownHostException;

 import android.util.Log;

 public class HttpGetProxy {
     final private String LOCAL_IP_ADDRESS = "127.0.0.1";
     final private int HTTP_PORT = 80;

     private ServerSocket localServer = null;
     private Socket localSocket = null;
     private Socket remoteSocket = null;
     private String remoteIPAddress;

     private InputStream in_remoteSocket;
     private OutputStream out_remoteSocket;
     private InputStream in_localSocket;
     private OutputStream out_localSocket;

     private interface OnFinishListener {
         void onFinishListener();
     }

     public HttpGetProxy(int localport) {

         // --------建立代理中转服务器-----------//
         try {
             localServer = new ServerSocket(localport, 1,
                     InetAddress.getByName(LOCAL_IP_ADDRESS));
         } catch (UnknownHostException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     /**
      * 结束时，清除所有资源
      */
     private OnFinishListener finishListener =new OnFinishListener(){

         @Override
         public void onFinishListener() {
             System.out.println("..........release all..........");
             Log.e("---->","..........release all..........");
             try {
                 in_localSocket.close();
                 out_remoteSocket.close();

                 in_remoteSocket.close();
                 out_localSocket.close();

                 localSocket.close();
                 remoteSocket.close();
             } catch (IOException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }
     };

     public void startProxy(String remoteIpAddr) throws IOException {
         remoteIPAddress = remoteIpAddr;
         SocketAddress address = new InetSocketAddress(remoteIPAddress,HTTP_PORT);

         // --------连接目标服务器---------//
         remoteSocket = new Socket();
         remoteSocket.connect(address);
         System.out.println("..........remote Server connected..........");
         Log.e("---->","..........remote Server connected..........");
         in_remoteSocket = remoteSocket.getInputStream();
         out_remoteSocket = remoteSocket.getOutputStream();
         System.out.println("..........init remote Server I/O..........");
         /**
          * 接收本地request，并转发到远程服务器
          */
         new Thread() {
             public void run() {
                 int bytes_read;
                 byte[] local_request = new byte[5120];
                 try {
                     // 本地Socket
                     localSocket = localServer.accept();
                     System.out.println("..........localSocket connected..........");
                     Log.e("---->","..........localSocket connected..........");
                     in_localSocket = localSocket.getInputStream();
                     out_localSocket = localSocket.getOutputStream();

                     System.out.println("..........init local Socket I/O..........");
                     Log.e("---->","..........init local Socket I/O..........");
                     String buffer = "";
                     while ((bytes_read = in_localSocket.read(local_request)) != -1) {
                         String str = new String(local_request);
                         System.out.println("localSocket     " + str);
                         Log.e("localSocket---->",str);
                         buffer = buffer + str;
                         if (buffer.contains("GET")
                                 && buffer.contains("\r\n\r\n")) {
                             //---把request中的本地ip改为远程ip---//
                             buffer = buffer.replace(LOCAL_IP_ADDRESS,remoteIPAddress);
                             System.out.println("已经替换IP");
                             out_remoteSocket.write(buffer.getBytes());
                             out_remoteSocket.flush();
                             continue;
                         } else{
                             out_remoteSocket.write(buffer.getBytes());
                             out_remoteSocket.flush();
                         }
                     }
                     System.out.println("..........local finish receive...........");
                     Log.e("---->","..........local finish receive..........");
                     finishListener.onFinishListener();
                 } catch (IOException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
         }.start();

         /**
          * 接收远程服务器reply，并转发到本地客户端
          */
         new Thread() {
             public void run() {
                 int bytes_read;
                 byte[] remote_reply = new byte[5120];
                 try {
                     System.out.println("..........remote start to receive...........");
                     Log.e("---->","..........remote start to receive..........");
                     while ((bytes_read = in_remoteSocket.read(remote_reply)) != -1) {

                         //System.out.println("remoteSocket     " + remote_reply.length);
                         //System.out.println("remoteSocket     " + new String(remote_reply));
                         out_localSocket.write(remote_reply, 0, bytes_read);
                         out_localSocket.flush();
                     }
                     System.out.println("..........remote finish receive...........");
                     Log.e("---->","..........remote finish receive..........");
                 } catch (IOException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
         }.start();
     }
 }
 </span>