java实现聊天室是怎么做到的？

Java 实现聊天室可以分为以下几个步骤：

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建立服务器端

首先需要建立一个服务器端，负责接收客户端的连接请求并处理客户端发送过来的消息。

建立客户端

然后需要建立客户端，客户端通过网络连接到服务器端，并向服务器端发送消息。

实现通信协议

为了实现聊天室功能，需要定义一个通信协议，规定客户端和服务器端之间的通信格式，例如消息的头部和内容等。

实现多线程处理

聊天室通常会有多个用户同时在线，因此需要使用多线程来处理多个客户端的连接请求和消息传递。

实现GUI界面（可选）

为了方便用户使用，可以实现一个GUI界面，让用户可以方便地发送和接收消息。

以下是一个简单的 Java 聊天室的代码示例：

java

Copy code

// 服务器端代码

public class Server {

public static void main(String[] args) {

try {

ServerSocket serverSocket = new ServerSocket(8888);

while (true) {

Socket socket = serverSocket.accept();

new Thread(new ServerThread(socket)).start();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

class ServerThread implements Runnable {

private Socket socket;

private BufferedReader reader;

private PrintWriter writer;

public ServerThread(Socket socket) {

this.socket = socket;

try {

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

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

} catch (IOException e) {

e.printStackTrace();

}

}

public void run() {

try {

String msg;

while ((msg = reader.readLine()) != null) {

// 处理客户端发送过来的消息

System.out.println("接收到消息：" + msg);

// 将消息发送给所有客户端

for (Socket s : ServerThreadList.getList()) {

if (s != socket) {

PrintWriter w = new PrintWriter(s.getOutputStream());

w.println(msg);

w.flush();

}

}

}

// 关闭连接

socket.close();

ServerThreadList.removeThread(this);

} catch (IOException e) {

e.printStackTrace();

}

}

}

class ServerThreadList {

private static List

list = new ArrayList();

public static void addThread(ServerThread thread) {

list.add(thread);

}

public static void removeThread(ServerThread thread) {

list.remove(thread);

}

public static List

getList() {

return list;

}

}

// 客户端代码

public class Client {

public static void main(String[] args) {

try {

Socket socket = new Socket("localhost", 8888);

new Thread(new ClientThread(socket)).start();

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

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

while (true) {

String msg = reader.readLine();

writer.println(msg);

writer.flush();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

class ClientThread implements Runnable {

private Socket socket;

private BufferedReader reader;

public ClientThread(Socket socket) {

this.socket = socket;

try {

reader

java 聊天室 源代码

【ClientSocketDemo.java 客户端Java源代码】

import java.net.*;

import java.io.*;

public class ClientSocketDemo

{

//声明客户端Socket对象socket

Socket socket = null;

//声明客户器端数据输入输出流

DataInputStream in;

DataOutputStream out;

//声明字符串数组对象response，用于存储从服务器接收到的信息

String response[];

//执行过程中，没有参数时的构造方法，本地服务器在本地，取默认端口10745

public ClientSocketDemo()

{

try

{

//创建客户端socket，服务器地址取本地，端口号为10745

socket = new Socket("localhost",10745);

//创建客户端数据输入输出流，用于对服务器端发送或接收数据

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

//获取客户端地址及端口号

String ip = String.valueOf(socket.getLocalAddress());

String port = String.valueOf(socket.getLocalPort());

//向服务器发送数据

out.writeUTF("Hello Server.This connection is from client.");

out.writeUTF(ip);

out.writeUTF(port);

//从服务器接收数据

response = new String[3];

for (int i = 0; i response.length; i++)

{

response[i] = in.readUTF();

System.out.println(response[i]);

}

}

catch(UnknownHostException e){e.printStackTrace();}

catch(IOException e){e.printStackTrace();}

}

//执行过程中，有一个参数时的构造方法，参数指定服务器地址，取默认端口10745

public ClientSocketDemo(String hostname)

{

try

{

//创建客户端socket，hostname参数指定服务器地址，端口号为10745

socket = new Socket(hostname,10745);

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

String ip = String.valueOf(socket.getLocalAddress());

String port = String.valueOf(socket.getLocalPort());

out.writeUTF("Hello Server.This connection is from client.");

out.writeUTF(ip);

out.writeUTF(port);

response = new String[3];

for (int i = 0; i response.length; i++)

{

response[i] = in.readUTF();

System.out.println(response[i]);

}

}

catch(UnknownHostException e){e.printStackTrace();}

catch(IOException e){e.printStackTrace();}

}

//执行过程中，有两个个参数时的构造方法，第一个参数hostname指定服务器地址

//第一个参数serverPort指定服务器端口号

public ClientSocketDemo(String hostname,String serverPort)

{

try

{

socket = new Socket(hostname,Integer.parseInt(serverPort));

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

String ip = String.valueOf(socket.getLocalAddress());

String port = String.valueOf(socket.getLocalPort());

out.writeUTF("Hello Server.This connection is from client.");

out.writeUTF(ip);

out.writeUTF(port);

response = new String[3];

for (int i = 0; i response.length; i++)

{

response[i] = in.readUTF();

System.out.println(response[i]);

}

}

catch(UnknownHostException e){e.printStackTrace();}

catch(IOException e){e.printStackTrace();}

}

public static void main(String[] args)

{

String comd[] = args;

if(comd.length == 0)

{

System.out.println("Use localhost(127.0.0.1) and default port");

ClientSocketDemo demo = new ClientSocketDemo();

}

else if(comd.length == 1)

{

System.out.println("Use default port");

ClientSocketDemo demo = new ClientSocketDemo(args[0]);

}

else if(comd.length == 2)

{

System.out.println("Hostname and port are named by user");

ClientSocketDemo demo = new ClientSocketDemo(args[0],args[1]);

}

else System.out.println("ERROR");

}

}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

【ServerSocketDemo.java 服务器端Java源代码】

import java.net.*;

import java.io.*;

public class ServerSocketDemo

{

//声明ServerSocket类对象

ServerSocket serverSocket;

//声明并初始化服务器端监听端口号常量

public static final int PORT = 10745;

//声明服务器端数据输入输出流

DataInputStream in;

DataOutputStream out;

//声明InetAddress类对象ip，用于获取服务器地址及端口号等信息

InetAddress ip = null;

//声明字符串数组对象request，用于存储从客户端发送来的信息

String request[];

public ServerSocketDemo()

{

request = new String[3]; //初始化字符串数组

try

{

//获取本地服务器地址信息

ip = InetAddress.getLocalHost();

//以PORT为服务端口号，创建serverSocket对象以监听该端口上的连接

serverSocket = new ServerSocket(PORT);

//创建Socket类的对象socket，用于保存连接到服务器的客户端socket对象

Socket socket = serverSocket.accept();

System.out.println("This is server:"+String.valueOf(ip)+PORT);

//创建服务器端数据输入输出流，用于对客户端接收或发送数据

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

//接收客户端发送来的数据信息，并显示

request[0] = in.readUTF();

request[1] = in.readUTF();

request[2] = in.readUTF();

System.out.println("Received messages form client is:");

System.out.println(request[0]);

System.out.println(request[1]);

System.out.println(request[2]);

//向客户端发送数据

out.writeUTF("Hello client!");

out.writeUTF("Your ip is:"+request[1]);

out.writeUTF("Your port is:"+request[2]);

}

catch(IOException e){e.printStackTrace();}

}

public static void main(String[] args)

{

ServerSocketDemo demo = new ServerSocketDemo();

}

}

用JAVA 编写简单网络聊天程序

/**

* 基于UDP协议的聊天程序

*

* 2007.9.18

* */

//导入包

import java.awt.*;

import java.awt.event.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

import java.net.*;

public class Chat extends JFrame implements ActionListener

{

//广播地址或者对方的地址

public static final String sendIP = "172.18.8.255";

//发送端口9527

public static final int sendPort = 9527;

JPanel p = new JPanel();

List lst = new List(); //消息显示

JTextField txtIP = new JTextField(18); //填写IP地址

JTextField txtMSG = new JTextField(20); //填写发送消息

JLabel lblIP = new JLabel("IP地址:");

JLabel lblMSG = new JLabel("消息:");

JButton btnSend = new JButton("发送");

byte [] buf;

//定义DatagramSocket的对象必须进行异常处理

//发送和接收数据报包的套接字

DatagramSocket ds = null;

//=============构造函数=====================

public Chat()

{

CreateInterFace();

//注册消息框监听器

txtMSG.addActionListener(this);

btnSend.addActionListener(this);

try

{

//端口:9527

ds =new DatagramSocket(sendPort);

}

catch(Exception ex)

{

ex.printStackTrace();

}

//============接受消息============

//匿名类

new Thread(new Runnable()

{

public void run()

{

byte buf[] = new byte[1024];

//表示接受数据报包

while(true)

{

try

{

DatagramPacket dp = new DatagramPacket(buf,1024,InetAddress.getByName(txtIP.getText()),sendPort);

ds.receive(dp);

lst.add("【消息来自】◆" + dp.getAddress().getHostAddress() + "◆"+"【说】:" + new String (buf,0,dp.getLength()) /*+ dp.getPort()*/,0);

}

catch(Exception e)

{

if(ds.isClosed())

{

e.printStackTrace();

}

}

}

}

}).start();

//关闭窗体事件

this.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent w)

{

System.out.println("test");

int n=JOptionPane.showConfirmDialog(null,"是否要退出?","退出",JOptionPane.YES_NO_OPTION);

if(n==JOptionPane.YES_OPTION)

{

dispose();

System.exit(0);

ds.close();//关闭ds对象//关闭数据报套接字

}

}

});

}

//界面设计布局

public void CreateInterFace()

{

this.add(lst,BorderLayout.CENTER);

this.add(p,BorderLayout.SOUTH);

p.add(lblIP);

p.add(txtIP);

p.add(lblMSG);

p.add(txtMSG);

p.add(btnSend);

txtIP.setText(sendIP);

//背景颜色

lst.setBackground(Color.yellow);

//JAVA默认风格

this.setUndecorated(true);

this.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);

this.setSize(600,500);

this.setTitle("〓聊天室〓");

this.setResizable(false);//不能改变窗体大小

this.setLocationRelativeTo(null);//窗体居中

this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

this.setVisible(true);

txtMSG.requestFocus();//消息框得到焦点

}

//===============================Main函数===============================

public static void main(String[]args)

{

new Chat();

}

//================================发送消息===============================

//消息框回车发送消息事件

public void actionPerformed(ActionEvent e)

{

//得到文本内容

buf = txtMSG.getText().getBytes();

//判断消息框是否为空

if (txtMSG.getText().length()==0)

{

JOptionPane.showMessageDialog(null,"发送消息不能为空","提示",JOptionPane.WARNING_MESSAGE);

}

else{

try

{

InetAddress address = InetAddress.getByName(sendIP);

DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName(txtIP.getText()),sendPort);

ds.send(dp);

}

catch(Exception ex)

{

ex.printStackTrace();

}

}

txtMSG.setText("");//清空消息框

//点发送按钮发送消息事件

if(e.getSource()==btnSend)

{

buf = txtMSG.getText().getBytes();

try

{

DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName(txtIP.getText()),sendPort);

}

catch(Exception ex)

{

ex.printStackTrace();

}

txtMSG.setText("");//清空消息框

txtMSG.requestFocus();

}

}

}

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