服务器不会连接到多个客户端（Java）

Question

我的服务器 class

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

public class server
{
   private Socket socket;
   private ServerSocket server;
    // constructor with port
   public void start(int port){
       try {
           server = new ServerSocket(port);
           while(true){
               socket = server.accept();
                   new ConnectionHandler(socket).run();

           }
       }catch(IOException i){

       }
   }
}

class ConnectionHandler implements  Runnable{
    private Socket       socket = null;
    private ServerSocket server = null;
    private DataInputStream in   = null;
    public ConnectionHandler(Socket socket){
        this.socket=socket;
    }
    @Override
    public void run() {
        InputStream inp = null;
        BufferedReader brinp = null;
        DataOutputStream out = null;
        try
        {
            System.out.println("Waiting for a client ...");
            System.out.println(server);
            System.out.println("Client accepted");
            in = new DataInputStream(new BufferedInputStream(socket.getInputStream()));

            String line = "";

            // reads message from client until "Over" is sent
            while (!line.equals("Over"))
            {
                try
                {
                    line = in.readUTF();
                    System.out.println(line);

                }
                catch(IOException i)
                {
                    System.out.println(i);
                }
            }
            System.out.println("Closing connection");

            // close connection
            socket.close();
            in.close();
        }
        catch(IOException i)
        {
            System.out.println(i);
        }
    }

    public static void main(String[] args) {
        server serverr = new server();
        serverr.start(4000);
    }
    }

这是我的客户 class。

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

public class Client
{
    // initialize socket and input output streams
    private Socket socket        = null;
    private DataInputStream input = null;
    private DataOutputStream out     = null;

    // constructor to put ip address and port
    public Client(String address, int port)
    {
        // establish a connection
        try
        {
            socket = new Socket(address, port);
            System.out.println("Connected");

            // takes input from terminal
            input = new DataInputStream(System.in);

            // sends output to the socket
            out = new DataOutputStream(socket.getOutputStream());
        }
        catch(UnknownHostException u)
        {
            System.out.println(u);
        }
        catch(IOException i)
        {
            System.out.println(i);
        }

        // string to read message from input
        String line = "";

        // keep reading until "Over" is input
        while (!line.equals("Over"))
        {
            try
            {
                line = input.readLine();
                out.writeUTF(line);
            }
            catch(IOException i)
            {
                System.out.println(i);
            }
        }

        // close the connection
        try
        {
            input.close();
            out.close();
            socket.close();
        }
        catch(IOException i)
        {
            System.out.println(i);
        }
    }

    public static void main(String args[])
    {
        Client client = new Client("127.0.0.1", 4000);
    }
}

尝试通过终端开发非常简单的聊天应用程序，但我认为我的代码中有很多错误。 服务器可以处理一个客户端，但是当另一个客户端出现时，它不会连接到其他客户端。 我现在该怎么办？ 我找不到问题出在哪里，等待您的帮助。 注意：我对套接字编程概念完全陌生。

Answer 1

ConnectionHandler class 是一个线程 class，您必须将其 object 包装到一个Thread实例中，然后调用start()而不是run() 。

所以在服务器class改

new ConnectionHandler(socket).run();

和

new Thread(ConnectionHandler(socket)).start();