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java网页聊天代码 java web在线聊天

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

jsp网页怎么实现即时聊天

jsp中可以实现简单的聊天功能,例子如下:

chat.jsp代码如下:

%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%

%@ page language="java" contentType="text/html;charset=GB2312"%

html

body

%

try{

request.setCharacterEncoding("GB2312");

String mywords=request.getParameter("message");

String t="";

if(application.getAttribute("words")==null mywords!=null){

t= (String)request.getRemoteAddr() + ":" + mywords + "br/";

application.setAttribute("words",(Object)t);

out.println(t);

}

else if(mywords!=null){

t=(String)application.getAttribute("words");

t += (String)request.getRemoteAddr() + ":" + mywords + "br/";

application.setAttribute("words",(Object)t);

out.println(t);

}

}

catch(Exception e){

}

%

form method="post" action="index.jsp"

input name="message" type="text" size=50

input type="submit" value="发送消息"

/form

/body/html

输出对话内容如下:

急需一个java编程实现的简单聊天窗口代码

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java点虐 .*;

import java.io.*;

public class ClientDemo01 {

public static void main(String[] args){

JFrame f=new JFrame("AA");

JPanel p1=new JPanel();

JPanel p2=new JPanel();

JTextArea ta=new JTextArea(15,30);

ta.setEditable(false); //文本域只读

JScrollPane sp=new JScrollPane(ta); //滚动窗格

JTextField tf=new JTextField(20);

JButton b=new JButton("发送");

p1.add(sp);

p2.add(tf);

p2.add(b);

f.add(p1,"Center");

f.add(p2,"South");

f.setBounds(300,300,360,300);

f.setVisible(true);

f.setResizable(false);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Socket socket=null;

BufferedInputStream bis=null;

BufferedOutputStream bos=null;

try{

socket=new Socket("192.168.0.4",5000);

bis=new BufferedInputStream(socket.getInputStream());

bos=new BufferedOutputStream(socket.getOutputStream());

MyThread01 mt=new MyThread01(bis,ta);

mt.start();

}catch(Exception e){

e.printStackTrace();

}

b.addActionListener(new ButtonActionListener01(tf,ta,bos));

}

}

class ButtonActionListener01 implements ActionListener{

JTextField tf;

JTextArea ta;

BufferedOutputStream bos;

public ButtonActionListener01(JTextField tf,JTextArea ta,BufferedOutputStream bos){

this.tf=tf;

this.ta=ta;

this.bos=bos;

}

public void actionPerformed(ActionEvent e){

String message=tf.getText();

if(!message.equals("")){

tf.setText(""); //清空文本框

ta.append("AA:"+message+"\n"); //添加到文本域并换行

try{

bos.write(message.getBytes());

bos.flush();

}catch(Exception ex){

System.out.println("发送失败");

}

}

}

}

class MyThread01 extends Thread{

BufferedInputStream bis;

JTextArea ta;

public MyThread01(BufferedInputStream bis,JTextArea ta){

this.bis=bis;

this.ta=ta;

}

public void run(){

try{

while(true){

byte[] b=new byte[100];

int length=bis.read(b);

String message=new String(b,0,length);

ta.append("BB:"+message+"\n");

}

}catch(Exception e){

e.printStackTrace();

}

}

} import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java点虐 .*;

import java.io.*;

public class ServerDemo01{

public static void main(String[] args){

JFrame f=new JFrame("BB");

JPanel p1=new JPanel();

JPanel p2=new JPanel();

JTextArea ta=new JTextArea(12,30); //文本域,第一个参数为行数,第二个参数为列数

ta.setEditable(false); //文本域只读

JScrollPane sp=new JScrollPane(ta); //滚动窗格

JTextField tf=new JTextField(20);

JButton b=new JButton("发送");

p1.add(sp);

p2.add(tf);

p2.add(b);

f.add(p1,"Center");

f.add(p2,"South");

f.setBounds(300,300,360,300);

f.setVisible(true);

f.setResizable(false);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

ServerSocket server=null;

Socket socket=null;

BufferedInputStream bis=null;

BufferedOutputStream bos=null;

try{

server=new ServerSocket(5000);

//ta.append("等待AA连接...\n");

socket=server.accept();

//ta.append("AA已连接\n");

bis=new BufferedInputStream(socket.getInputStream());

bos=new BufferedOutputStream(socket.getOutputStream());

MyThread1 mt=new MyThread1(bis,ta);

mt.start();

}catch(Exception e){

e.printStackTrace();

}

b.addActionListener(new ButtonActionListener1(tf,ta,bos));

}

}

class ButtonActionListener1 implements ActionListener{

JTextField tf;

JTextArea ta;

BufferedOutputStream bos;

public ButtonActionListener1(JTextField tf,JTextArea ta,BufferedOutputStream bos){

this.tf=tf;

this.ta=ta;

this.bos=bos;

}

public void actionPerformed(ActionEvent e){

String message=tf.getText(); //获取文本框中的内容

if(!message.equals("")){

tf.setText(""); //清空文本框

ta.append("BB:"+message+"\n"); //添加到文本域并换行

try{

bos.write(message.getBytes());

bos.flush();

}catch(Exception ex){

System.out.println("发送失败!");

}

}

}

}

class MyThread1 extends Thread{

BufferedInputStream bis;

JTextArea ta;

public MyThread1(BufferedInputStream bis,JTextArea ta){

this.bis=bis;

this.ta=ta;

}

public void run(){

try{

while(true){

byte[] b=new byte[100];

int length=bis.read(b);

String message=new String(b,0,length);

ta.append("AA:"+message+"\n");

}

}catch(Exception e){

e.printStackTrace();

}

}

}


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