鍦↗ava涓紝鍙互浣跨敤Socket绫绘潵瀹炵幇绔彛杞彂銆備互涓嬫槸涓€涓畝鍗曠殑绀轰緥浠ｇ爜锛屾紨绀轰簡濡備綍灏嗘湰鍦扮殑涓€涓鍙ｈ浆鍙戝埌鍙︿竴涓繙绋嬩富鏈虹殑绔彛銆?/p>

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class PortForwardingExample {
    public static void main(String[] args) {
        int localPort = 12345; // 鏈湴绔彛
        String remoteHost = "example.com"; // 杩滅▼涓绘満
        int remotePort = 80; // 杩滅▼绔彛

        try {
            // 鍒涘缓鏈湴鏈嶅姟鍣ㄥ鎺ュ瓧
            ServerSocket serverSocket = new ServerSocket(localPort);
            System.out.println("绛夊緟瀹㈡埛绔繛鎺?..");

            while (true) {
                // 鐩戝惉瀹㈡埛绔繛鎺?/span>
                Socket clientSocket = serverSocket.accept();
                System.out.println("瀹㈡埛绔繛鎺ユ垚鍔?");

                // 鍒涘缓涓庤繙绋嬩富鏈虹殑濂楁帴瀛楄繛鎺?/span>
                Socket remoteSocket = new Socket(remoteHost, remotePort);

                // 鍒涘缓绾跨▼杩涜鏁版嵁杞彂
                Thread inputThread = new Thread(new ForwardingHandler(clientSocket.getInputStream(), remoteSocket.getOutputStream()));
                Thread outputThread = new Thread(new ForwardingHandler(remoteSocket.getInputStream(), clientSocket.getOutputStream()));

                inputThread.start();
                outputThread.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 鏁版嵁杞彂澶勭悊鍣?/span>
    static class ForwardingHandler implements Runnable {
        private final InputStream input;
        private final OutputStream output;

        public ForwardingHandler(InputStream input, OutputStream output) {
            this.input = input;
            this.output = output;
        }

        @Override
        public void run() {
            byte[] buffer = new byte[4096];
            int bytesRead;

            try {
                while ((bytesRead = input.read(buffer)) != -1) {
                    output.write(buffer, 0, bytesRead);
                    output.flush();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

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