TCP一对多聊天服务器的实现（多线程场景）

1.服务器的连接设计

2.服务器的线程设计

3.创建服务端

package com.yqq.app3;

/**
* @Author yqq
* @Date 2021/11/08 22:28
* @Version 1.0
*/

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

/**
* 接受客户端发送消息的线程
*/
class ChatReceive extends Thread{
private Socket socket;
public ChatReceive(Socket socket){
this.socket=socket;
}
@Override
public void run() {
this.receiveMsg();
}
/**
* 实现接受客户端发送的消息
*/
private void receiveMsg(){
BufferedReader br =null;
try {
br=new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
while(true){
String msg = br.readLine();
//将数据加入数据公共区域
synchronized ("yqq"){
ChatRoomServer.buf="["+this.socket.getInetAddress()+"]"+msg;
//唤醒等待的线程，被相同锁对象使用者
"yqq".notifyAll();
}
}
}catch (Exception e){
e.printStackTrace();
}finally {
if(br!=null){
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(this.socket!=null){
try {
this.socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
/**
* 向客户端发送消息的线程
*/
class ChatSend extends Thread{
Socket socket=null;
public ChatSend(Socket socket){
this.socket=socket;
}
@Override
public void run() {
this.sendMsg();
}
/**
* 将公共数据区域的数据发送给客户端
*/
private void sendMsg(){
PrintWriter pw =null;
try {
pw =new PrintWriter(this.socket.getOutputStream());
while (true){
synchronized ("yqq"){
//让发送消息的线程处于等待状态
"yqq".wait();
//将公共数据区中的消息发送给客户端
pw.println(ChatRoomServer.buf);
pw.flush();
}
}
}catch (Exception e){
e.printStackTrace();
}finally {
if(pw!=null){
pw.close();
}
if(this.socket!=null){
try {
this.socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

}
}
public class ChatRoomServer {
//定义公共数据区
public static String buf;
public static void main(String[] args) {
System.out.println("Chat Server Version 1.0");
System.out.println("Listen at 8888");
ServerSocket serverSocket =null;
try {
serverSocket=new ServerSocket(8888);
while (true){
Socket socket=serverSocket.accept();
System.out.println("连接到："+socket.getInetAddress());
new ChatReceive(socket).start();
new ChatSend(socket).start();
}
}catch (Exception e){
e.printStackTrace();
}finally {
if(serverSocket!=null){
try {
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}

4.创建客户端

package com.yqq.app3;

/**
* @Author yqq
* @Date 2021/11/08 22:28
* @Version 1.0
*/

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
* 发送消息线程
*/
class Send1 extends Thread{
private Socket socket;
private Scanner scanner;
public Send1(Socket socket,Scanner scanner){
this.socket = socket;
this.scanner = scanner;
}
@Override
public void run() {
this.sendMsg();
}
/**
* 发送消息
*/
private void sendMsg(){

PrintWriter pw = null;
try{
//创建向对方输出消息的流对象
pw = new PrintWriter(this.socket.getOutputStream());
while(true){
String msg = scanner.nextLine();
pw.println(msg);
pw.flush();
}
}catch(Exception e){
e.printStackTrace();
}finally {
if(scanner != null ){
scanner.close();
}
if(pw != null){
pw.close();
}
if(this.socket != null){
try {
this.socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}

/**
* 接收消息的线程
*/
class Receive1 extends Thread{
private Socket socket;
public Receive1(Socket socket){
this.socket = socket;
}
@Override
public void run() {
this.receiveMsg();
}
/**
* 用于接收对方消息的方法
*/
private void receiveMsg(){
BufferedReader br = null;
try{
//创建用于接收对方发送消息的流对象
br = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
while(true){
String msg = br.readLine();
System.out.println("他说："+msg);
}
}catch(Exception e){
e.printStackTrace();
}finally{
if(br != null){
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(this.socket != null){
try {
this.socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
public class GoodTCP {
public static void main(String[] args) {
Scanner scanner = null;
ServerSocket serverSocket = null;
Socket socket = null;
try{
scanner = new Scanner(System.in);
System.out.println("请输入：server,<port> 或者：<ip>,<port>");
String str = scanner.nextLine();
String[] arr = str.split(",");
if("server".equals(arr[0])){
//启动服务端
System.out.println("TCP Server Listen at "+arr[1]+" .....");
serverSocket = new ServerSocket(Integer.parseInt(arr[1]));
socket = serverSocket.accept();
System.out.println("连接成功！");

}else{
//启动客户端
socket = new Socket(arr[0],Integer.parseInt(arr[1]));
System.out.println("连接成功！");
}
//启动发送消息的线程
new Send1(socket,scanner).start();
//启动接收消息的线程
new Receive1(socket).start();
}catch(Exception e){
e.printStackTrace();
}finally{
if(serverSocket != null){
try {
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}

5.通信

客户端：

客户端1：

客户端2：

总服务器：