tcp编程：聊天室

服务器

package com.sundear.demo.chat4;

import com.sundear.demo.chat3.SxtUtils;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * 在线聊天室：服务器
 * 群聊
 * 多线程
 */
public class Chat {
    //高并发容器 线程安全
    private static CopyOnWriteArrayList<Channel> all =new CopyOnWriteArrayList<Channel>();

    public static void main(String[] args) throws IOException {
        System.out.println("----server----");
        ServerSocket server = new ServerSocket(8888);
        while(true){
            Socket client = server.accept();
            System.out.println("一个客户建立了连接");
            Channel c = new Channel(client);
            all.add(c);//管理所有的成员
            new Thread(c).start();
        }

    }
    //一个客户等于一个Channel
    static class Channel implements Runnable{
        private DataInputStream dis;
        private DataOutputStream dos;
        private Socket client;
        private boolean isRunning ;
        private String name;
        public Channel(Socket client){
          this.client =client;
            try {
                dis =new DataInputStream(client.getInputStream());
                dos =new DataOutputStream(client.getOutputStream());
                isRunning =true;
                //获取名称
                this.name = receive();
                this.send("欢迎你的到来");
                sendOthers(this.name+"来了nono聊天室",true);
            } catch (IOException e) {
                release();
            }


        }
        //接收消息
        private String receive(){
            String msg="";
            try {
                msg = dis.readUTF();
            } catch (IOException e) {
                System.out.println("----2---");
                release();
            }
            return msg;
        }
        //发送消息
        private void send(String msg){
            try {
                dos.writeUTF(msg);
            } catch (IOException e) {
                System.out.println("---3----");
                release();
            }
        }

        //群聊
        private void sendOthers(String msg,Boolean isSys){
         for(Channel other:all){
             if(other==this){
                 continue;
             }
             if(!isSys) {
                 other.send(this.name + ":" + msg);//群聊消息
             }else{
                 other.send(msg);//系统消息
             }

         }
        }

        //释放资源
        private void release(){
            this.isRunning =false;
            SxtUtils.close(dis,dos,client);
            all.remove(this);
            sendOthers(this.name+"离开了nono聊天室",true);
        }



    @Override
    public void run() {
        while(isRunning) {
            String msg=receive();
            if(!msg.equals("")){
                //send(msg);
                sendOthers(msg,false);
            }
        }
    }
}
}

　　发送端

package com.sundear.demo.chat4;

import com.sundear.demo.chat3.SxtUtils;

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

/**
 * 发送端
 */
public class Send implements Runnable{
    private BufferedReader console;
    private DataOutputStream dos;
    private Socket client;
    private boolean isRunning;
    private String name;
    public Send(Socket client,String name){
        this.client = client;
        this.name =name;
        isRunning = true;
        console = new BufferedReader(new InputStreamReader(System.in));
        try {
            dos = new DataOutputStream(client.getOutputStream());
            send(name);
        } catch (IOException e) {
            System.out.println("--1---");
            release();
        }
    }
    //释放资源
    private void release(){
        this.isRunning =false;
        SxtUtils.close(dos,client);
    }
    @Override
    public void run() {
        while(isRunning) {
            String msg=getStrFromConsole();
            if(!msg.equals("")){
                send(msg);
            }
        }

    }

    private void send(String msg){
        try {
            dos.writeUTF(msg);
            dos.flush();
        } catch (IOException e) {
            System.out.println("---3---");
            release();
        }

    }
    private String getStrFromConsole(){
        try{
            return console.readLine();
        }catch (IOException e){
            e.printStackTrace();
        }
        return "";
    }

}

　　接收端

package com.sundear.demo.chat4;

import com.sundear.demo.chat3.SxtUtils;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;

/**
 * 接收端
 */
public class Receive implements Runnable{
    private DataInputStream dis;
    private Socket client ;
    private Boolean isRunning;
    public  Receive(Socket client){
        this.client =client;
        try {
            dis = new DataInputStream(client.getInputStream());
            isRunning =true;
        } catch (IOException e) {
            System.out.println("---1---");
            release();
        }
    }
    //释放资源
    private void release(){
        this.isRunning =false;
        SxtUtils.close(dis,client);
    }

    private String receive(){
        String msg="";
        try {
            msg = dis.readUTF();
        } catch (IOException e) {
            System.out.println("----4---");
            release();
        }
        return msg;
    }
    @Override
    public void run() {
      while(isRunning){
          String msg =receive();
          if(!msg.equals("")){
              System.out.println(msg);
          }
      }
    }
}

　客户端：实现多人聊天可以开多个客户端

package com.sundear.demo.chat4;

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

/**
 * 在线聊天室：客户端
 * 多线程实现多个客户正常接收多条信息
 */
public class MultiClient {
    public static void main(String[] args) throws IOException {
        System.out.println("----client----");
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("请输入用户名");
        String name =br.readLine();
        Socket client = new Socket("localhost", 8888);
        new Thread(new Send(client,name)).start();
        new Thread(new Receive(client)).start();

    }
}