java.net.BindException : Address already in use: JVM_Bind Multi Client Server

Question

我有一个服务器项目和一个客户端项目。当服务器运行时，来自客户端的第一个连接工作正常。在第二次连接时，服务器会引发“java.net.BindException:地址已在使用中:JVM_Bind”错误。有没有办法在同一端口上添加更多连接？

服务器:

public class Main {

public static void main(String[] args) throws IOException, ClassNotFoundException {

    Socket pipe = null;
    while(true){

    ServerSocket s = new ServerSocket(2345);
    pipe = s.accept();

    Connection c = new Connection(pipe);
    c.start();

    }
}

}

public class Connection extends Thread{

private Socket socket = null;

Mensch jim = null;
ObjectInputStream input = null;
ObjectOutputStream output = null;
ServerSocket s = null;

public Connection(Socket s){
    socket = s;
}
   public void run(){
        try {
        input = new ObjectInputStream(socket.getInputStream());
        output = new ObjectOutputStream(socket.getOutputStream());

        jim = (Mensch) input.readObject();
        jim.setAge(33);

        output.writeObject(jim);

        input.close();
        output.close();

        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

}}

客户:

public class Main {

public static void main(String[] args) {
    Mensch jim = new Mensch(19, "Jim");

    System.out.println(jim.getAge());
    try {
        Socket s = new Socket("127.0.0.1", 2345);

        ObjectOutputStream clientOutputStream = new ObjectOutputStream(s.getOutputStream());
        ObjectInputStream clientInputStream = new ObjectInputStream(s.getInputStream());

        clientOutputStream.writeObject(jim);



        jim = (Mensch)  clientInputStream.readObject();

        System.out.println(jim.getAge());

        clientOutputStream.close();
        clientInputStream.close();


    } catch (ClassNotFoundException e) {
            e.printStackTrace();
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

}

Answer 1

这就是问题:

while(true) {
    ServerSocket s = new ServerSocket(2345);
    pipe = s.accept();
    ...
}

您正在尝试重复绑定(bind)到同一端口。您所需要做的就是创建一个单个 ServerSocket 并对其多次调用accept。 (我还将 pipe 变量声明移到循环内...)

ServerSocket s = new ServerSocket(2345);
while(true) {
    Socket pipe = s.accept();
    ...
}