[問題] 請問關於Socket TCP/IP

[pugboy ()]

Client的Code如下

import java.net.*;
import java.io.*;
public class SocketClient {

    static Socket sock;

    //constructor
    public SocketClient() {}

    //Main method
    static public void main(String[] args)throws Exception {
        new SocketClient();
        //設定欲連接之主機(localhost:自己的主機)及其port number
        sock = new Socket("localhost",1234);
        DataInputStream din = new DataInputStream(System.in);
        PrintStream sout = new PrintStream(sock.getOutputStream());
        //輸入測試資料 "testsocket"
        System.out.println("Client請輸入testsocket:");
        String line = din.readLine();
        //送資料給Server
        sout.println(line);
        //關閉此socket
        sock.close();
    }
}

Server的Code如下

import java.net.*;
import java.io.*;

public class SocketServer {
    static Socket sock;
    static ServerSocket ss;

    //constructor
    public SocketServer() {}

    //Main method
    static public void main(String[] args)throws Exception {
        new SocketServer();
        //設定port number
        ss = new ServerSocket(1237);
        //顯示開啟此Server
        System.out.println("Server等待連線中...");
        //接收Client要求
        sock = ss.accept();
        InputStream in = sock.getInputStream();
        DataInputStream din = new DataInputStream(in);
        String line = din.readLine();
        if(line.trim().equals("testsocket"))
        //顯示連線成功
        System.out.println("連線成功!!!");
        //關閉此socket
        sock.close();
    }
}


請問我在Client端打sock = new Socket("localhost",1237);時 可以正常執行

但是改成1234時

Error如下:

Exception in thread "main" java.net.ConnectException: Connection refused:
connect
        at java.net.DualStackPlainSocketImpl.connect0(Native Method)
        at
java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69)
        at
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
        at java.net.Socket.connect(Socket.java:579)
        at java.net.Socket.connect(Socket.java:528)
        at java.net.Socket.<init>(Socket.java:425)
        at java.net.Socket.<init>(Socket.java:208)
        at SocketClient.main(SocketClient.java:14)

請問是因為少import東西造成的嗎?

麻煩可以幫我 deBugs嗎??

謝謝各位高手!

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推 superlubu:server port 1237 client 連1234 當然會 refuse 啊
→ pugboy:解決了 謝謝你!!