群聊天就是一個比較典型的多人聊天平臺，我們總會拉幾個朋友、或是同學、同事建立一個群聊，在里面聊聊天、討論學習工作等等。那么多人聊天具體是怎么實現的呢？下面，將通過Java的多線程來實現多人聊天室的效果。

1.前言

程序實現基于星型結構(服務器接收來自各個客戶端發送的信息，然后將信息傳遞給其他客戶端界面并在其他客戶端界面顯示發送的信息)

2.類圖

3.代碼

客戶端代碼：

package netProgram;

import java.io.IOException;

import java.net.Socket;

import java.net.SocketAddress;

public class Client implements ScreenInputInterface{

private SocketHandler socketHandler;

public void start(){

new Thread(new ScreenInputRunIns(this)).start();

try {

socketHandler = new SocketHandler(new Socket("127.0.0.1",666),null);

new Thread(socketHandler).start();

} catch (IOException e) {

e.printStackTrace();

}

}

@Override

public void send(String msg) {

socketHandler.sendMsg(msg);

}

/* @Override

public void send(String msg, SocketAddress address) {

socketHandler.sendMsg(msg);

}*/

}

服務端代碼：

package netProgram;

import java.io.IOException;

import java.net.ServerSocket;

import java.net.SocketAddress;

import java.util.ArrayList;

import java.util.List;

public class Server implements ScreenInputInterface{

private List clients = new ArrayList<>();

private ServerSocket serverSocket;

public void start(){

// new Thread(new ScreenInputRunIns(this)).start();

try {

serverSocket = new ServerSocket(666);

while (true){

SocketHandler socketHandler = new SocketHandler(serverSocket.accept(),this);

clients.add(socketHandler);

System.out.println(socketHandler.getSocket().getRemoteSocketAddress()+"進入聊天系統");

new Thread(socketHandler).start();

}

} catch (IOException e) {

e.printStackTrace();

}

}

@Override

public void send(String msg) {

for (SocketHandler s:clients) {

s.sendMsg(msg);

}

}

/* @Override

public void send(String msg, SocketAddress address) {

for (SocketHandler s:clients) {

if (s.getSocket().getRemoteSocketAddress().equals(address)){

continue;

}

s.sendMsg(msg);

}

}*/

public static void main(String[] args) {

new Server().start();

}

}

屏幕輸入信息接口：

package netProgram;

import java.net.SocketAddress;

public interface ScreenInputInterface {

void send(String msg);

// void send(String msg, SocketAddress address);

}

用于各個端口輸入信息的創建的線程對象：

package netProgram;

import java.util.Scanner;

public class ScreenInputRunIns implements Runnable{

private ScreenInputInterface screenInputInterface;

private Scanner input = new Scanner(System.in);

public ScreenInputRunIns(ScreenInputInterface screenInputInterface) {

this.screenInputInterface = screenInputInterface;

}

@Override

public void run() {//屏幕實時輸入

while (true){

String msg = input.nextLine();

// screenInputInterface.send(msg,null);

screenInputInterface.send(msg);

}

}

}

套接字處理器(用于傳輸數據：實際發送信息到輸出流并實時監聽各個端口的輸入且負責顯示)：

package netProgram;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.Socket;

public class SocketHandler implements Runnable{

private String clientName;

private Socket socket;

private PrintWriter writer;

private Server server;

public SocketHandler(Socket socket,Server server) throws IOException {

this.socket = socket;

this.server = server;

clientName = "";

writer = new PrintWriter(this.socket.getOutputStream());

}

public Socket getSocket() {

return socket;

}

public void sendMsg(String msg){

if (server!=null) writer.println(msg);

else writer.println(clientName+":"+msg);

writer.flush();

}

@Override

public void run() {

while(true){//監聽輸入流的輸入

try {

BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

String receiveMsg = null;

System.out.println();

if ((receiveMsg = reader.readLine())!=null&&!(receiveMsg.equals(""))){

if (server!=null){

// server.send(receiveMsg,socket.getRemoteSocketAddress());

server.send(receiveMsg);

}else {

System.out.println(receiveMsg);

}

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

負責啟動的各個端口的客戶端代碼：

package netProgram;

public class ClientLinked {

public static void main(String[] args) {

new Client().start();

}

}

package netProgram;

public class ClientLinked1 {

public static void main(String[] args) {

new Client().start();

}

}

package netProgram;

public class ClientLinked2 {

public static void main(String[] args) {

new Client().start();

}

}

服務端啟動代碼在服務端類的main方法中。

到此本篇關于使用Java多線程來實現多人聊天室的文章就介紹結束了，想要了解更多相關java多線程的其他應用內容，請搜索W3Cschool以前的文章或繼續瀏覽下面的相關文章。希望本篇文章能夠幫助大家對于Java多線程的理解，也希望大家以后多多支持！

總結

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