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（1）以下是主服务程序，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
[code]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");
}
}
}
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效果还不错，用firefox/ ie都测试过，可用。
————————————————
原文链接：https://blog.csdn.net/java2000_net/article/details/7826660
程序猿的技术大观园：www.javathinker.net
[这个贴子最后由 admin 在 2020-01-01 12:54:48 重新编辑]
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Java技术网站 → 『 Java开发技术 』 → 『 Java编程技术专题 』 → 用Java Socket实现代理服务器程序
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