java循环聊天代码 java循环语句实例

急求一个关于UDP的JAVA实现多人聊天源代码

import java.io.InputStream;

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import java.io.DataInputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.DataOutputStream;

import java.io.BufferedReader;

import java.net.ServerSocket;

import java.net.Socket;

import java.io.IOException;

import java.util.Date;

class Server

{

public Server()

{

try

{

ServerSocket s=new ServerSocket(8888);

Socket ss=s.accept();

OutputStream out=ss.getOutputStream();

DataOutputStream dout=new DataOutputStream(out);

InputStream in=ss.getInputStream();

DataInputStream din=new DataInputStream(in);

System.out.print(din.readUTF()+"!");

dout.writeUTF("你已经连接到服务器"+"\t"+"你的地址："+ss.getInetAddress()+"\t"

+"你的链接端口："+ss.getLocalPort()+"\n");

new ReadMessage(din).start();

new SendMessage(dout).start();

}

catch (IOException e)

{

e.printStackTrace();

}

}

public static void main(String[] args)

{

new Server();

}

}

//接受客户端信息

class ReadMessage extends Thread

{

private DataInputStream din;

public ReadMessage(DataInputStream din)

{

this.din=din;

}

public void run()

{

String str;

try

{

while (true)

{

str=din.readUTF();

System.out.println(new Date().toLocaleString()+"客户端说："+str);

if (str.equals("bye"))

{

System.out.println("客户端下线！");

break;

}

}

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

// 发出服务器信息

class SendMessage extends Thread

{

private DataOutputStream dout;

public SendMessage(DataOutputStream dout)

{

this.dout=dout;

}

public void run()

{

InputStreamReader inr=new InputStreamReader(System.in);

BufferedReader buf=new BufferedReader(inr);

String str;

try

{

while(true)

{

str=buf.readLine();

dout.writeUTF(str);

if (str.equals("bye"))

{

System.out.println("服务器退出！");

System.exit(1);

}

}

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

import java.io.InputStream;

import java.io.DataInputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.DataOutputStream;

import java.io.BufferedReader;

import java.net.Socket;

import java.io.IOException;

import java.util.Date;

class Client

{

public Client()

{

try

{

Socket s=new Socket("192.168.1.2",8888);

InputStream in=s.getInputStream();

DataInputStream din=new DataInputStream(in);

OutputStream out=s.getOutputStream();

DataOutputStream dout=new DataOutputStream(out);

dout.writeUTF("服务器你好！我是客户端");

System.out.println(din.readUTF());

new Thread(new SenderMessage(dout)).start();

new Thread(new ReaderMessage(din)).start();

}

catch (IOException e)

{

e.printStackTrace();

}

}

public static void main(String[] args)

{

new Client();

}

}

class ReaderMessage implements Runnable

{

private DataInputStream din;

public ReaderMessage(DataInputStream din)

{

this.din=din;

}

public void run()

{

String str;

try

{

while(true)

{

str=din.readUTF();

System.out.println(new Date().toLocaleString()+"服务器说："+str);

if (str.equals("bye"))

{

System.out.println("服务器已经关闭，此程序自动退出！");

break;

}

}

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

class SenderMessage implements Runnable

{

private DataOutputStream dout;

public SenderMessage(DataOutputStream dout)

{

this.dout=dout;

}

public void run()

{

String str;

InputStreamReader inf=new InputStreamReader(System.in);

BufferedReader buf=new BufferedReader(inf);

try

{

while (true)

{

str=buf.readLine();

dout.writeUTF(str);

if (str.equals("bye"))

{

System.out.println("客户端自己退出！");

System.exit(1);

}

}

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

用Java完成服务器和客户端的循环聊天

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JSplitPane;

import javax.swing.JTextArea;

public class ChatFrame extends JPanel{

private static final long serialVersionUID = 1L;

private int width=450,height=450;

boolean flag;

int port = 10086;

String address = "192.168.33.52";

// int port = 2425;

DatagramSocket send;

DatagramSocket receive;

UDP_Send udpSend;

JTextArea showTextArea;

JTextArea inputTextArea;

JPanel rightPanel;

JScrollPane scrollPane1;

JScrollPane scrollPane2;

JSplitPane splitPane1;

JSplitPane splitPane2;

JButton sendButton;

JButton closeButton;

JPanel buttonpane;

public ChatFrame() throws Exception {

super(null, true);

send = new DatagramSocket();

receive = new DatagramSocket(port);

udpSend =new UDP_Send(send,port);

showTextArea = new JTextArea();

showTextArea.setLineWrap(true);

showTextArea.setEditable(false);

showTextArea.setForeground(new Color(0xf90033));

scrollPane1 = new JScrollPane(showTextArea);

inputTextArea = new JTextArea();

inputTextArea.setLineWrap(true);

scrollPane2 = new JScrollPane(inputTextArea);

rightPanel = new JPanel();

rightPanel.setBackground(new Color(0x0099ff));

splitPane1 = new JSplitPane(JSplitPane.VERTICAL_SPLIT,true,scrollPane1,scrollPane2);

splitPane2 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,splitPane1,rightPanel);

inputTextArea.addKeyListener(new KeyListener() {

@Override

public void keyTyped(KeyEvent e) {}

@Override

public void keyReleased(KeyEvent e) {}

@Override

public void keyPressed(KeyEvent e) {

switch (e.getKeyCode()) {

case KeyEvent.VK_ENTER:

udpSend.send(port);

inputTextArea.setText("");

break;

default:

break;

}

}

});

sendButton = new JButton("发送");

sendButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

udpSend.send(port);

inputTextArea.setText("");

}

});

closeButton = new JButton("关闭");

closeButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

});

buttonpane = new JPanel();

buttonpane.add(closeButton);

buttonpane.add(sendButton);

splitPane1.setBounds(0, 0, width, height-32);

splitPane1.setDividerLocation(0.8);

splitPane2.setBounds(0, 0, width, height-32);

splitPane2.setDividerLocation(0.8);

buttonpane.setBounds(width-250, height-32, 140, 32);

this.add(splitPane2);

this.add(buttonpane);

this.setPreferredSize(new Dimension(width,height));

new Thread(new UDP_Receive(receive)).start();

}

public static void main(String[] args) throws Exception {

JFrame frame = new JFrame();

frame.setContentPane(new ChatFrame());

frame.pack();

frame.setResizable(false);

frame.setLocationRelativeTo(null);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

class UDP_Send{

DatagramSocket datagramSocket;

int port;

String text;

public UDP_Send(DatagramSocket datagramSocket,int port) {

this.datagramSocket = datagramSocket;

this.port = port;

}

public void send(int port) {

try {

text = new String(inputTextArea.getText().getBytes(), "utf-8");

byte buffered[] = text.getBytes();

DatagramPacket database = new DatagramPacket(buffered,

buffered.length, InetAddress.getByName(address),port) ;

showTextArea.setFont(new Font("微软雅黑", Font.CENTER_BASELINE, 24));

showTextArea.append("本机"+":\n");

showTextArea.setFont(new Font("仿宋", Font.CENTER_BASELINE, 16));

showTextArea.append(" "+text+"\n");

datagramSocket.send(database);

} catch (IOException e) {

e.printStackTrace();

}

}

}

class UDP_Receive implements Runnable {

DatagramSocket datagramSocket;

public UDP_Receive(DatagramSocket datagramSocket) {

this.datagramSocket = datagramSocket;

}

@Override

public void run() {

try {

byte buff[] = new byte[4096];

DatagramPacket database = new DatagramPacket(buff, buff.length);

while (true) {

datagramSocket.receive(database);

String text = new String(database.getData(), 0,database.getLength(),"utf-8");

showTextArea.setFont(new Font("微软雅黑", Font.CENTER_BASELINE, 24));

showTextArea.append(database.getAddress()+":\n");

showTextArea.setFont(new Font("仿宋", Font.CENTER_BASELINE, 16));

showTextArea.append(" "+text+"\n");

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

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：

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