Android MediaPlayer与Http Proxy结合之基础篇

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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。

"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();
    }
}