java实现多客户聊天功能

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

public class ReceiveThread extends Thread{

 private Socket socket; //私有的成员变量，套接字
 
 public ReceiveThread(Socket socket) {
  this.socket = socket;
 }

 @Override
 public void run() {
  BufferedReader br = null;//使用带缓冲区的字符输入流接收信息
  try {
   br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
  } catch (IOException e) {
   e.printStackTrace();
  }
  while(true){
   try {
    System.out.println(br.readLine());
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }
}

import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class Client {
 @SuppressWarnings("all")
 public static void main(String[] args) throws UnknownHostException, IOException {  
        //ip：需要连接的服务端所在的ip
        //端口：客户端连接的端口必须和服务端端口一致
  Socket socket = new Socket("192.168.*.*",8080);
  Scanner scan = new Scanner(System.in);
  new ReceiveThread(socket).start();
  //发送给服务端信息
  while(true ){
   PrintStream ps = new PrintStream(socket.getOutputStream());
   ps.println("一号："+scan.next());  
  }
 }
}

Socket socket = new Socket("127.0.0.1",8080);
Scanner scan = new Scanner(System.in);
new ReceiveThread(socket).start();
//发送给服务端信息
while(true ){
    PrintStream ps = new PrintStream(socket.getOutputStream());
    ps.println("二号："+scan.next());  
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Map.Entry;
import java.util.Set;

public class ServerThread  extends Thread{

 private Socket socket;
 
 public ServerThread(Socket socket) {
  this.socket = socket;
 }
 @Override
 public void run() {
  BufferedReader br = null;
  String str=null;
  try {
   br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
  } catch (IOException e) {
   e.printStackTrace();
  }
  while(true){
   try {
    str=br.readLine();
                //在服务端输出，可以监测到所有人的聊天信息。
    System.out.println(str);
    
    //发送到其他客户端
    Set<Entry<InetAddress, Socket>> entrySet = Server.map.entrySet();
    for (Entry<InetAddress, Socket> entry : entrySet) {
     InetAddress key = entry.getKey();
     Socket value = entry.getValue();
     if(socket.getInetAddress()!=key){
      PrintStream printStream = new PrintStream(value.getOutputStream());
      printStream.println(str);
     }
    }
    
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }
}

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ConcurrentHashMap;

public class Server {
 @SuppressWarnings("all")
    
 public static ConcurrentHashMap<InetAddress, Socket> map =new ConcurrentHashMap<>();
 public static void main(String[] args) throws IOException, InterruptedException {

  //创建服务端的ServerSocket
  ServerSocket server = new ServerSocket(8080);
  while(true){
            //接收到客户连接就创建一个对应的套接字
   Socket socket = server.accept();
            //获取该客户的ip
   InetAddress inetAddress = socket.getInetAddress();
   //将该客户的ip和套接字装入map集合
   map.put(inetAddress, socket);
            //创建新的线程服务该客户
   new ServerThread(socket).start();
  }  
 }
}