Android MediaPlayer与Http Proxy结合之基础篇

本文来自 http://blog.youkuaiyun.com/hellogv/  

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.youkuaiyun.com/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.youkuaiyun.com/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;" mce_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>