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import java.awt.*;
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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();
}
}
}
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点虐 .ServerSocket;
import java点虐 .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点虐 .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();
}
}
}
Java多人聊天可以使用Java的Socket编程实现,主要的思路是:使用服务器来维护所有客户端的连接,并将客户端之间的聊天信息进行转发。
具体的实现步骤如下:
创建服务器端:使用ServerSocket类创建一个服务器端,并监听指定的端口,等待客户端的连接。
创建客户端:使用Socket类创建一个客户端,并连接到服务器端。
实现聊天功能:客户端和服务器端之间可以通过输入和输出流进行通信,客户端将聊天信息发送给服务器,服务器再将其转发给其他客户端。
处理异常:在实现聊天功能时,需要注意处理可能出现的异常,例如连接异常、输入输出异常等等。
一个简单的Java多人聊天程序的代码框架如下:
服务器端:
import java.io.IOException;
import java点虐 .ServerSocket;
import java点虐 .Socket;
import java.util.ArrayList;
public class ChatServer {
private ServerSocket serverSocket;
private ArrayListClientHandler clients;
public ChatServer(int port) throws IOException {
serverSocket = new ServerSocket(port);
clients = new ArrayListClientHandler();
System.out.println("服务器已启动,等待客户端连接...");
}
public void start() throws IOException {
while (true) {
Socket socket = serverSocket.accept();
ClientHandler client = new ClientHandler(socket, this);
clients.add(client);
client.start();
}
}
public void broadcast(String message) {
for (ClientHandler client : clients) {
client.sendMessage(message);
}
}
public void removeClient(ClientHandler client) {
clients.remove(client);
}
public static void main(String[] args) throws IOException {
ChatServer server = new ChatServer(12345);
server.start();
}
}
客户端:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java点虐 .Socket;
public class ChatClient {
private Socket socket;
private BufferedReader reader;
private PrintWriter writer;
private String name;
public ChatClient(String serverAddress, int port, String name) throws IOException {
socket = new Socket(serverAddress, port);
reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
writer = new PrintWriter(socket.getOutputStream(), true);
this.name = name;
}
public void start() throws IOException {
System.out.println("欢迎来到聊天室!");
new Thread(new IncomingMessageHandler()).start();
new Thread(new OutgoingMessageHandler()).start();
}
private class IncomingMessageHandler implements Runnable {
@Override
public void run() {
try {
while (true) {
String message = reader.readLine();
if (message == null) {
break;
}
System.out.println(message);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
close();
}
}
}
private class OutgoingMessageHandler implements Runnable {
@Override
public void run() {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
try {
while (true) {
String message = reader.readLine();
if (message.equals("quit")) {
break;
}
writer.println(name + ": " + message);
}
} catch (IOException e) {
e.printStackTrace;
} finally {
close();
}
}
}
//以下引入包
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java点虐 .*;
import java.applet.*;
public class regit extends JApplet implements ActionListener,ItemListener//接口
{
String s=null;
//对象的声明
JLabel labelname,labelpass,labelsxe,labeladdress,labelmail,labelphone;//标签
JTextField textname,textaddress,textmail,textphone;//文本框
JRadioButton r1,r2;//单选按纽
ButtonGroup bg;//组
JPasswordField textpass;//密码域
JButton buttonregit,buttonreset;//注册按纽 重写按纽
JPanel p;//面板
String sex;//定义性别字符串
URL url;//统一资源定位
BufferedWriter out1,out2;//流
BufferedReader in;
//布局方式
GridBagLayout gbl;
GridBagConstraints gc;
AppletContext co;//接口
//初始化
public void init()
{
//new 对象
labelname=new JLabel("用 户 名:");
labelpass=new JLabel("用户密码:");
labelsxe=new JLabel("性别:");
labeladdress=new JLabel("地址:");
labelmail=new JLabel("电子邮件:");
labelphone=new JLabel("联系电话:");
textname=new JTextField(15); textname.setForeground(Color.red);
textname.setToolTipText("请在这输入你的用户名");
textaddress=new JTextField(15);textaddress.setForeground(Color.red);
textaddress.setToolTipText("请在这输入你的地址");
textmail=new JTextField(15); textmail.setForeground(Color.red);
textmail.setToolTipText("请在这里输入你的E-mail地址");
textphone=new JTextField(15); textphone.setForeground(Color.red);
textphone.setToolTipText("请在这输入你的电话号码");
r1=new JRadioButton("男"); r1.setBackground(new Color(47,177,210));//设置颜色
r2=new JRadioButton("女"); r2.setBackground(new Color(47,177,210));//设置颜色
bg=new ButtonGroup();
bg.add(r1);bg.add(r2);//加入组,实现单选
textpass=new JPasswordField(15);
textpass.setToolTipText("在这里输入密码");
textpass.setForeground(Color.red);
buttonregit=new JButton("注册"); buttonregit.setBackground(new Color(47,177,210));//设置颜色
buttonregit.setToolTipText("点击按纽完成注册");
buttonreset=new JButton("填写"); buttonreset.setBackground(new Color(47,177,210));//设置颜色
buttonreset.setToolTipText("点击按纽刷新重写");
gbl=new GridBagLayout(); ///////////////////////////////////////
gc=new GridBagConstraints(); //////采用GridBagLayout布局方式////////
p=new JPanel();
p.setLayout(gbl);
p.setBackground(new Color(47,177,210));
this.getContentPane().add(p);//加入面板
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=2;
gbl.setConstraints(labelname,gc);
p.add(labelname);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=2;
gbl.setConstraints(textname,gc);
p.add(textname);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=4;
gbl.setConstraints(labelpass,gc);
p.add(labelpass);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=4;
gbl.setConstraints(textpass,gc);
p.add(textpass);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=6;
gbl.setConstraints(labelsxe,gc);
p.add(labelsxe);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=6;
gbl.setConstraints(r1,gc);
p.add(r1);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=5;
gc.gridy=6;
gbl.setConstraints(r2,gc);
p.add(r2);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=8;
gbl.setConstraints(labeladdress,gc);
p.add(labeladdress);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=8;
gbl.setConstraints(textaddress,gc);
p.add(textaddress);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=10;
gbl.setConstraints(labelmail,gc);
p.add(labelmail);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=10;
gbl.setConstraints(textmail,gc);
p.add(textmail);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=12;
gbl.setConstraints(labelphone,gc);
p.add(labelphone);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=12;
gbl.setConstraints(textphone,gc);
p.add(textphone);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=16;
gbl.setConstraints(buttonregit,gc);
p.add(buttonregit);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=16;
gbl.setConstraints(buttonreset,gc);
p.add(buttonreset);
/////////////////////////////////////////////
co=this.getAppletContext();
/////////////////////////////////////////////
buttonregit.addActionListener(this);//按纽事件的监听
buttonreset.addActionListener(this);//按纽事件的监听
r1.addItemListener(this);//选择事件的监听
r2.addItemListener(this);//选择事件的监听
textphone.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
//注册按纽事件
if(e.getSource()==buttonregit)
{
String s1=textname.getText(); ////////////////////
String s2=new String(textpass.getPassword());////////////////////
String s3=textaddress.getText(); // 定义字符串 //
String s4=textmail.getText(); ////////////////////
String s5=textphone.getText(); ////////////////////
//判断注册资料 信息 是否为空
if(s1.length()==0 || s2.length()==0 ||s3.length()==0 ||s4.length()==0 ||s5.length()==0)
{
int error=JOptionPane.INFORMATION_MESSAGE;
JOptionPane.showMessageDialog(null,"资料不能为空,请重新注册!","【温馨提示】",error);
return;//弹出对话框并返回
}
try//写入到txt文件
{
in=new BufferedReader(new FileReader("d:\\迷离视线聊天室\\password.txt"));
}
catch(Exception ee){}
String ss=s1;
try
{
while((s=in.readLine())!=null)
{
if(s.startsWith(ss))
{
JOptionPane.showMessageDialog(null,"用户名已经存在,请更换名字!");
textname.setText("");//设置为空,重新输入
textpass.setText("");
textaddress.setText("");
textmail.setText("");
textphone.setText("");
return;
}
}
}
catch(Exception ee){}
///////////////////////////以上代码判断是否有同名
{
try
{
out1=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\password.txt",true));
out2=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\message.txt",true));
}//创建文件
catch(Exception ee)
{}
try
{
out1.write(s1+"#"+s2);//写
out1.newLine();
out2.write("用户名:"+s1);
out2.newLine();
out2.write("密码:"+s2);
out2.newLine();
out2.write("性别:"+sex);
out2.newLine();
out2.write("地址:"+s3);
out2.newLine();
out2.write("电子邮件:"+s4);
out2.newLine();
out2.write("电话:"+s5);
out2.newLine();
out1.flush();
out2.flush();//清理缓冲
out1.close();
out2.close();
}
catch(Exception ee)
{}
JOptionPane.showMessageDialog(null,"注册成功!");
try
{
String qss="";
url=new url(/qss);//连接上网址
co.showDocument(url);
}
catch(Exception exx)
{}
}
}
//////////////////////以下为回车事件
if(e.getSource()==textphone)
{
String s1=textname.getText(); ////////////////////
String s2=new String(textpass.getPassword());////////////////////
String s3=textaddress.getText(); // 定义字符串 //
String s4=textmail.getText(); ////////////////////
String s5=textphone.getText(); ////////////////////
//判断注册资料 信息 是否为空
if(s1.length()==0 || s2.length()==0 ||s3.length()==0 ||s4.length()==0 ||s5.length()==0)
{
int error=JOptionPane.INFORMATION_MESSAGE;
JOptionPane.showMessageDialog(null,"资料不能为空,请重新注册!","【温馨提示】",error);
return;//弹出对话框并返回
}
try//写入到txt文件
{
in=new BufferedReader(new FileReader("d:\\迷离视线聊天室\\password.txt"));
}
catch(Exception ee){}
String ss=s1;
try
{
while((s=in.readLine())!=null)
{
if(s.startsWith(ss))
{
JOptionPane.showMessageDialog(null,"用户名已经存在,请更换名字!");
textname.setText("");//设置为空,重新输入
textpass.setText("");
textaddress.setText("");
textmail.setText("");
textphone.setText("");
return;
}
}
}
catch(Exception ee){}
///////////////////////////以上代码判断是否有同名
{
try
{
out1=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\password.txt",true));
out2=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\message.txt",true));
}//创建文件
catch(Exception ee)
{}
try
{
out1.write(s1+"#"+s2);//写
out1.newLine();
out2.write("用户名:"+s1+"密码:"+s2+"性别:"+sex+"地址:"+s3+"电子邮件:"+s4+"电话:"+s5);//写
out2.newLine();
out1.flush();
out2.flush();//清理缓冲
out1.close();
out2.close();
}
catch(Exception ee)
{}
JOptionPane.showMessageDialog(null,"注册成功!");
try
{
String qss="";
url=new url(/qss);//连接上网址
co.showDocument(url);
}
catch(Exception exx)
{}
}
}
if(e.getSource()==buttonreset)//刷新重写事件
{
textname.setText("");
textpass.setText("");
textaddress.setText("");
textmail.setText("");
textphone.setText("");
}
}
//////////////////////////////////////////
//
public void itemStateChanged(ItemEvent ex)
{
if(ex.getSource()==r1)
{
sex=new String("男");
}
else if(ex.getSource()==r2)
{
sex=new String("女");
}
}
}
参考资料:试试看,刚在网上找的