分享一下我老师大神的人工智能教程！零基础，通俗易懂！http://blog.csdn.net/jiangjunshow
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直接贴代码，不解释
1 主服务，用来侦听端口
package org.javaren.proxy;import java.net.ServerSocket;import java.net.Socket;public class SocketProxy { /** * @param args */ public static void main(String[] args) throws Exception { ServerSocket serverSocket = new ServerSocket(8888); while (true) { Socket socket = null; try { socket = serverSocket.accept(); new SocketThread(socket).start(); } catch (Exception e) { e.printStackTrace(); } } }}2 核心代码，处理链接的代理线程
内部设计了Socket的认证，自己看吧
package org.javaren.proxy;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;public class SocketThread extends Thread { private Socket socketIn; private InputStream isIn; private OutputStream osIn; // private Socket socketOut; private InputStream isOut; private OutputStream osOut; public SocketThread(Socket socket) { this.socketIn = socket; } private byte[] buffer = new byte[4096]; private static final byte[] VER = { 0x5, 0x0 }; private static final byte[] CONNECT_OK = { 0x5, 0x0, 0x0, 0x1, 0, 0, 0, 0, 0, 0 }; public void run() { try { System.out.println("\n\na client connect " + socketIn.getInetAddress() + ":" + socketIn.getPort()); isIn = socketIn.getInputStream(); osIn = socketIn.getOutputStream(); int len = isIn.read(buffer); System.out.println("< " + bytesToHexString(buffer, 0, len)); osIn.write(VER); osIn.flush(); System.out.println("> " + bytesToHexString(VER, 0, VER.length)); len = isIn.read(buffer); System.out.println("< " + bytesToHexString(buffer, 0, len)); // 查找主机和端口 String host = findHost(buffer, 4, 7); int port = findPort(buffer, 8, 9); System.out.println("host=" + host + ",port=" + port); socketOut = new Socket(host, port); isOut = socketOut.getInputStream(); osOut = socketOut.getOutputStream(); // for (int i = 4; i <= 9; i++) { CONNECT_OK[i] = buffer[i]; } osIn.write(CONNECT_OK); osIn.flush(); System.out.println("> " + bytesToHexString(CONNECT_OK, 0, CONNECT_OK.length)); SocketThreadOutput out = new SocketThreadOutput(isIn, osOut); out.start(); SocketThreadInput in = new SocketThreadInput(isOut, osIn); in.start(); out.join(); in.join(); } catch (Exception e) { System.out.println("a client leave"); } finally { try { if (socketIn != null) { socketIn.close(); } } catch (IOException e) { e.printStackTrace(); } } System.out.println("socket close"); } public static String findHost(byte[] bArray, int begin, int end) { StringBuffer sb = new StringBuffer(); for (int i = begin; i <= end; i++) { sb.append(Integer.toString(0xFF & bArray[i])); sb.append("."); } sb.deleteCharAt(sb.length() - 1); return sb.toString(); } public static int findPort(byte[] bArray, int begin, int end) { int port = 0; for (int i = begin; i <= end; i++) { port <<= 16; port += bArray[i]; } return port; } // 4A 7D EB 69 // 74 125 235 105 public static final String bytesToHexString(byte[] bArray, int begin, int end) { StringBuffer sb = new StringBuffer(bArray.length); String sTemp; for (int i = begin; i < end; i++) { sTemp = Integer.toHexString(0xFF & bArray[i]); if (sTemp.length() < 2) sb.append(0); sb.append(sTemp.toUpperCase()); sb.append(" "); } return sb.toString(); }}3 读取线程，负责外面读数据，写入到请求端
package org.javaren.proxy;/** * * 从外部读取，向内部发送信息 */import java.io.InputStream;import java.io.OutputStream;public class SocketThreadInput extends Thread { private InputStream isOut; private OutputStream osIn; public SocketThreadInput(InputStream isOut, OutputStream osIn) { this.isOut = isOut; this.osIn = osIn; } private byte[] buffer = new byte[409600]; public void run() { try { int len; while ((len = isOut.read(buffer)) != -1) { if (len > 0) { System.out.println(new String(buffer, 0, len)); osIn.write(buffer, 0, len); osIn.flush(); } } } catch (Exception e) { System.out.println("SocketThreadInput leave"); } }}4 写入线程，负责读取请求端数据，写入到目标端
package org.javaren.proxy;import java.io.InputStream;import java.io.OutputStream;/** * 从内部读取，向外部发送信息 * * @author zxq * */public class SocketThreadOutput extends Thread { private InputStream isIn; private OutputStream osOut; public SocketThreadOutput(InputStream isIn, OutputStream osOut) { this.isIn = isIn; this.osOut = osOut; } private byte[] buffer = new byte[409600]; public void run() { try { int len; while ((len = isIn.read(buffer)) != -1) { if (len > 0) { System.out.println(new String(buffer, 0, len)); osOut.write(buffer, 0, len); osOut.flush(); } } } catch (Exception e) { System.out.println("SocketThreadOutput leave"); } }}效果还不错，用firefox/ ie都测试过，可用。
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