Question

所以我还是Java的网络新手，其中大部分都是令人困惑的，特别是Threaded Servers。我在两周前制作了一个简单的套接字聊天程序，但是我想扩展它，但在局域网上有多个客户端和自动服务器检测（通过广播或手动ping每个ip /端口）。但本周我主要关注多个客户端，即拥有多线程服务器。这是我到目前为止的代码，但它的错误，服务器只向第二个客户端发送/接收消息，第一个客户端只能在服务器忽略它之前发送一条消息。我的目标是让这个服务器支持大约10-20个客户端。

package org.codingllamas.Chat;

import java.awt.Toolkit;
import java.io.*;
import java.net.*;

import javax.swing.text.BadLocationException;
import javax.swing.text.html.HTML;

public class SC {

static Socket clientSocket;
static BufferedReader inFromServer;
static BufferedWriter outToServer;

public static void clientSetup(int port,String ip) throws IOException, BadLocationException {
     String incomingSentence;
     Start.kit.insertHTML(Start.doc,Start.doc.getLength(),"<b>Connected to </b>" + ip + ":" + port + "<br>",0,0,HTML.Tag.B);
     clientSocket = new Socket(ip,port);
     while (true) {
         inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
         incomingSentence = inFromServer.readLine();     
         Toolkit.getDefaultToolkit().beep();
         Start.window.requestFocus();
         Start.kit.insertHTML(Start.doc,Start.doc.getLength(),"<b>Server: </b>" + incomingSentence + "<br>",0,0,HTML.Tag.B);
     }
}

public static void clientSend(String msg) throws IOException, BadLocationException{
    outToServer = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
    outToServer.write(msg + "\r\n");
    outToServer.flush();
    outToServer.write(msg + "\r\n");
    outToServer.flush();
    Start.kit.insertHTML(Start.doc,Start.doc.getLength(),"<b>You: </b>" + msg + "<br>",0,0,HTML.Tag.B);
}

static ServerSocket welcomeSocket;
static Socket connectionSocket;
static BufferedReader inFromClient;
static BufferedWriter outToClient;

public static void secondClient() throws IOException{

    connectionSocket = welcomeSocket.accept();


}

public static void serverSetup(int port) throws Exception {
    welcomeSocket = new ServerSocket(port);
    Start.kit.insertHTML(Start.doc,Start.doc.getLength(),"<b>Server Started on port: " + port + "</b><br>",0,0,HTML.Tag.B);
    connectionSocket = welcomeSocket.accept();
    new Thread(new Runnable(){
        public void run(){
            try {
                secondClient();
            } catch (IOException e) {
                System.out.println("Cannot send message");
                e.printStackTrace();
            }
        }
    }).start();
    String clientSentence;
    while(true){       
        inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
        clientSentence = inFromClient.readLine();
        Toolkit.getDefaultToolkit().beep();
        Start.window.requestFocus();
        Start.kit.insertHTML(Start.doc,Start.doc.getLength(),"<b>Parther: </b>" + inFromClient.readLine() + "<br>",0,0,HTML.Tag.B);
   }
}

public static void serverSend(String msg) throws IOException, BadLocationException {
    outToClient = new BufferedWriter(new OutputStreamWriter(connectionSocket.getOutputStream()));
    outToClient.write(msg + "\r\n");
    outToClient.flush();
    Start.kit.insertHTML(Start.doc,Start.doc.getLength(),"<b>You: </b>" + msg + "<br>",0,0,HTML.Tag.B);
}
}

Answer 1

由于您希望能够拥有多个客户端，因此您应该创建一个主要目的是等待和接受连接。

接下来你应该为客户端提供一个对象，这样他们就可以轻松地存储他们的套接字并放入一个数组中。在此客户端对象中，您可以创建用于发送和接收数据的线程，以及客户端单独的输入/输出流。

这将使您的程序可扩展为多个客户端，并使处理所有客户端变得更容易。

多客户端聊天服务器

1 个答案: