Android MediaPlayer与Http Proxy结合之基础篇

 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.youkuaiyun.com/detail/hcb1230/6593451，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. 
   

1. 接下来贴出HttpGetProxy.java的原理图：
   
   

2. 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>