Android MediaPlayer与Http Proxy结合之基础篇

本文来自http://blog.csdn.net/hellogv/ ，引用. 
    

       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。

[java] view
plaincopyprint?

1. <span style="font-family:Comic Sans MS;font-size:18px;">package com.musicplayer;  
2.   
3. import java.io.IOException;  
4. import java.io.InputStream;  
5. import java.io.OutputStream;  
6. import java.net.InetAddress;  
7. import java.net.InetSocketAddress;  
8. import java.net.ServerSocket;  
9. import java.net.Socket;  
10. import java.net.SocketAddress;  
11. import java.net.UnknownHostException;  
12.   
13. import android.util.Log;  
14.   
15. public class HttpGetProxy {  
16.     final private String LOCAL_IP_ADDRESS = "127.0.0.1";  
17.     final private int HTTP_PORT = 80;  
18.   
19.     private ServerSocket localServer = null;  
20.     private Socket localSocket = null;  
21.     private Socket remoteSocket = null;  
22.     private String remoteIPAddress;  
23.   
24.     private InputStream in_remoteSocket;  
25.     private OutputStream out_remoteSocket;  
26.     private InputStream in_localSocket;  
27.     private OutputStream out_localSocket;  
28.       
29.     private interface OnFinishListener {  
30.         void onFinishListener();  
31.     }  
32.       
33.     public HttpGetProxy(int localport) {  
34.   
35.         // --------建立代理中转服务器-----------//  
36.         try {  
37.             localServer = new ServerSocket(localport, 1,  
38.                     InetAddress.getByName(LOCAL_IP_ADDRESS));  
39.         } catch (UnknownHostException e) {  
40.             // TODO Auto-generated catch block  
41.             e.printStackTrace();  
42.         } catch (IOException e) {  
43.             // TODO Auto-generated catch block  
44.             e.printStackTrace();  
45.         }  
46.     }  
47.   
48.     /** 
49.      * 结束时，清除所有资源 
50.      */  
51.     private OnFinishListener finishListener =new OnFinishListener(){  
52.   
53.         @Override  
54.         public void onFinishListener() {  
55.             System.out.println("..........release all..........");  
56.             Log.e("---->","..........release all..........");  
57.             try {  
58.                 in_localSocket.close();  
59.                 out_remoteSocket.close();  
60.                   
61.                 in_remoteSocket.close();  
62.                 out_localSocket.close();  
63.                   
64.                 localSocket.close();  
65.                 remoteSocket.close();  
66.             } catch (IOException e) {  
67.                 // TODO Auto-generated catch block  
68.                 e.printStackTrace();  
69.             }  
70.         }  
71.     };  
72.       
73.     public void startProxy(String remoteIpAddr) throws IOException {  
74.         remoteIPAddress = remoteIpAddr;  
75.         SocketAddress address = new InetSocketAddress(remoteIPAddress,HTTP_PORT);  
76.   
77.         // --------连接目标服务器---------//  
78.         remoteSocket = new Socket();  
79.         remoteSocket.connect(address);  
80.         System.out.println("..........remote Server connected..........");  
81.         Log.e("---->","..........remote Server connected..........");  
82.         in_remoteSocket = remoteSocket.getInputStream();  
83.         out_remoteSocket = remoteSocket.getOutputStream();  
84.         System.out.println("..........init remote Server I/O..........");  
85.         /** 
86.          * 接收本地request，并转发到远程服务器 
87.          */  
88.         new Thread() {  
89.             public void run() {  
90.                 int bytes_read;  
91.                 byte[] local_request = new byte[5120];  
92.                 try {  
93.                     // 本地Socket  
94.                     localSocket = localServer.accept();  
95.                     System.out.println("..........localSocket connected..........");  
96.                     Log.e("---->","..........localSocket connected..........");  
97.                     in_localSocket = localSocket.getInputStream();  
98.                     out_localSocket = localSocket.getOutputStream();  
99.   
100.                     System.out.println("..........init local Socket I/O..........");  
101.                     Log.e("---->","..........init local Socket I/O..........");  
102.                     String buffer = "";  
103.                     while ((bytes_read = in_localSocket.read(local_request)) != -1) {  
104.                         String str = new String(local_request);  
105.                         System.out.println("localSocket     " + str);  
106.                         Log.e("localSocket---->",str);  
107.                         buffer = buffer + str;  
108.                         if (buffer.contains("GET")  
109.                                 && buffer.contains("\r\n\r\n")) {  
110.                             //---把request中的本地ip改为远程ip---//  
111.                             buffer = buffer.replace(LOCAL_IP_ADDRESS,remoteIPAddress);  
112.                             System.out.println("已经替换IP");  
113.                             out_remoteSocket.write(buffer.getBytes());  
114.                             out_remoteSocket.flush();  
115.                             continue;  
116.                         } else{  
117.                             out_remoteSocket.write(buffer.getBytes());  
118.                             out_remoteSocket.flush();  
119.                         }  
120.                     }  
121.                     System.out.println("..........local finish receive...........");  
122.                     Log.e("---->","..........local finish receive..........");  
123.                     finishListener.onFinishListener();  
124.                 } catch (IOException e) {  
125.                     // TODO Auto-generated catch block  
126.                     e.printStackTrace();  
127.                 }  
128.             }  
129.         }.start();  
130.   
131.         /** 
132.          * 接收远程服务器reply，并转发到本地客户端 
133.          */  
134.         new Thread() {  
135.             public void run() {  
136.                 int bytes_read;  
137.                 byte[] remote_reply = new byte[5120];  
138.                 try {  
139.                     System.out.println("..........remote start to receive...........");  
140.                     Log.e("---->","..........remote start to receive..........");  
141.                     while ((bytes_read = in_remoteSocket.read(remote_reply)) != -1) {  
142.                           
143.                         //System.out.println("remoteSocket     " + remote_reply.length);  
144.                         //System.out.println("remoteSocket     " + new String(remote_reply));  
145.                         out_localSocket.write(remote_reply, 0, bytes_read);  
146.                         out_localSocket.flush();  
147.                     }  
148.                     System.out.println("..........remote finish receive...........");  
149.                     Log.e("---->","..........remote finish receive..........");  
150.                 } catch (IOException e) {  
151.                     // TODO Auto-generated catch block  
152.                     e.printStackTrace();  
153.                 }  
154.             }  
155.         }.start();  
156.     }  
157. }  
158. </span>