Java套接字连接超时，在本地工作

Question

有问题的代码是这样的:

class Server {
    public static void main(String[] args) {
        try {
            ServerSocket ss = new ServerSocket(4001);
            Socket s = ss.accept();
            // streams, buffer, strings, main loop and socket closing; all works fine
        }catch(Exception e) {/*handle*/}
    }
}

class Client {
    public static void main(String[] args) {
        try {
            Socket s = new Socket(InetAddress.getByName("24.135.22.219"), 4001); // << Connection fails here.
            // streams, buffer, strings, main loop and socket closing; all works fine
        }catch(Exception e) {/*handle*/}
    }
}

当 "serverIP" 替换为 InetAddress.getByName(null) 时，在本地一切正常。但是，当它替换为我的 IP 地址时，无法建立连接(即使我禁用 Windows 防火墙)，并且收到连接超时错误。

用于测试的文件是here .

Answer 1

您需要将 ServerSocket 绑定(bind)到您尝试连接的同一地址:

ServerSocket ss = new ServerSocket();
ss.bind(new InetSocketAddress("<serverIp>", 4001));
Socket s = ss.accept();