Android(安卓)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！

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：

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：
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 plain copy print ?

<spanstyle="font-family:ComicSansMS;font-size:18px;">packagecom.musicplayer;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.OutputStream;
importjava.net.InetAddress;
importjava.net.InetSocketAddress;
importjava.net.ServerSocket;
importjava.net.Socket;
importjava.net.SocketAddress;
importjava.net.UnknownHostException;
importandroid.util.Log;
publicclassHttpGetProxy{
finalprivateStringLOCAL_IP_ADDRESS="127.0.0.1";
finalprivateintHTTP_PORT=80;
privateServerSocketlocalServer=null;
privateSocketlocalSocket=null;
privateSocketremoteSocket=null;
privateStringremoteIPAddress;
privateInputStreamin_remoteSocket;
privateOutputStreamout_remoteSocket;
privateInputStreamin_localSocket;
privateOutputStreamout_localSocket;
privateinterfaceOnFinishListener{
voidonFinishListener();
}
publicHttpGetProxy(intlocalport){
//--------建立代理中转服务器-----------//
try{
localServer=newServerSocket(localport,1,
InetAddress.getByName(LOCAL_IP_ADDRESS));
}catch(UnknownHostExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
/**
*结束时，清除所有资源
*/
privateOnFinishListenerfinishListener=newOnFinishListener(){
@Override
publicvoidonFinishListener(){
System.out.println("..........releaseall..........");
Log.e("---->","..........releaseall..........");
try{
in_localSocket.close();
out_remoteSocket.close();
in_remoteSocket.close();
out_localSocket.close();
localSocket.close();
remoteSocket.close();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
};
publicvoidstartProxy(StringremoteIpAddr)throwsIOException{
remoteIPAddress=remoteIpAddr;
SocketAddressaddress=newInetSocketAddress(remoteIPAddress,HTTP_PORT);
//--------连接目标服务器---------//
remoteSocket=newSocket();
remoteSocket.connect(address);
System.out.println("..........remoteServerconnected..........");
Log.e("---->","..........remoteServerconnected..........");
in_remoteSocket=remoteSocket.getInputStream();
out_remoteSocket=remoteSocket.getOutputStream();
System.out.println("..........initremoteServerI/O..........");
/**
*接收本地request，并转发到远程服务器
*/
newThread(){
publicvoidrun(){
intbytes_read;
byte[]local_request=newbyte[5120];
try{
//本地Socket
localSocket=localServer.accept();
System.out.println("..........localSocketconnected..........");
Log.e("---->","..........localSocketconnected..........");
in_localSocket=localSocket.getInputStream();
out_localSocket=localSocket.getOutputStream();
System.out.println("..........initlocalSocketI/O..........");
Log.e("---->","..........initlocalSocketI/O..........");
Stringbuffer="";
while((bytes_read=in_localSocket.read(local_request))!=-1){
Stringstr=newString(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("..........localfinishreceive...........");
Log.e("---->","..........localfinishreceive..........");
finishListener.onFinishListener();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}.start();
/**
*接收远程服务器reply，并转发到本地客户端
*/
newThread(){
publicvoidrun(){
intbytes_read;
byte[]remote_reply=newbyte[5120];
try{
System.out.println("..........remotestarttoreceive...........");
Log.e("---->","..........remotestarttoreceive..........");
while((bytes_read=in_remoteSocket.read(remote_reply))!=-1){
//System.out.println("remoteSocket"+remote_reply.length);
//System.out.println("remoteSocket"+newString(remote_reply));
out_localSocket.write(remote_reply,0,bytes_read);
out_localSocket.flush();
}
System.out.println("..........remotefinishreceive...........");
Log.e("---->","..........remotefinishreceive..........");
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}.start();
}
}
</span>

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