最近半年都忙着Android TV項目，在春節假期才有時間寫點東西。先在這裡給大家拜個年，祝大家龍年快樂...
直接進入主題：本文将會教大家如何實作一個簡單的代理伺服器(僅支援Http Get)，與Android的MediaPlayer結合，進而可以擴充出“播放 防盜鍊的媒體檔案”，“邊播放邊儲存”等的功能。
J2SE工程：HttpGetProxy，在PC上實作簡單的代理伺服器，核心類是HttpGetProxy.java，非常容易使用，這裡就不唠叨了直接貼出運作效果圖：
接下來貼出HttpGetProxy.java的原理圖：
接下來貼出HttpGetProxy.java的源碼：
通過RemoteSocket的out_remoteSocket可以通路防盜鍊資源，HttpGetProxy通過2個線程來實作轉發，可以在兩個線程内實作儲存的功能。
<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) {
// --------建立代理中轉伺服器-----------//
try {
localServer = new ServerSocket(localport, 1,
InetAddress.getByName(LOCAL_IP_ADDRESS));
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
}
/**
* 結束時，清除所有資源
*/
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);
// --------連接配接目标伺服器---------//
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，并轉發到遠端伺服器
*/
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改為遠端ip---//
buffer = buffer.replace(LOCAL_IP_ADDRESS,remoteIPAddress);
System.out.println("已經替換IP");
out_remoteSocket.write(buffer.getBytes());
out_remoteSocket.flush();
continue;
} else{
}
}
System.out.println("..........local finish receive...........");
Log.e("---->","..........local finish receive..........");
finishListener.onFinishListener();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}.start();
* 接收遠端伺服器reply，并轉發到本地用戶端
byte[] remote_reply = new byte[5120];
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..........");
}
</span>