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！      

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       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。

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 blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * 结束时，清除所有资源 */private OnFinishListener finishListener =new OnFinishListener(){@Overridepublic 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 blocke.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SocketlocalSocket = 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 blocke.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 blocke.printStackTrace();}}}.start();}}