一对多聊天室-编程知识

多人聊天包

由于要先创建服务面板，接收客户端连接的信息，此代码使用顺序为先启动服务端，在启动客户端，服务端不用关，不然会报错。多运行几次客户端，实现单人聊天

创建服务面板

package yiduiduo;import java.awt.BorderLayout;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;public class Ltmb extends JFrame {private JTextArea ta_info;private ServerSocket server; // 声明ServerSocket对象private Socket socket; // 声明Socket对象socketprivate Hashtable<String, Socket> map = new Hashtable<String, Socket>();// 用于存储连接到服务器的用户和客户端套接字对象public void createSocket() {try {server = new ServerSocket(1978);while (true) {ta_info.append("等待新客户连接......\n");socket = server.accept();// 创建套接字对象ta_info.append("客户端连接成功。" + socket + "\n");new ServerThread(socket).start();// 创建并启动线程对象}} catch (IOException e) {e.printStackTrace();}}class ServerThread extends Thread {Socket socket;public ServerThread(Socket socket) {this.socket = socket;}public void run() {try {BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));// 创建输入流对象while (true) {String info = in.readLine();// 读取信息String key = "";if (info.startsWith("用户：")) {// 添加登录用户到客户端列表key = info.substring(3, info.length());// 获得用户名并作为键使用map.put(key, socket);// 添加键值对Set<String> set = map.keySet();// 获得集合中所有键的Set视图Iterator<String> keyIt = set.iterator();// 获得所有键的迭代器while (keyIt.hasNext()) {String receiveKey = keyIt.next();// 获得表示接收信息的键Socket s = map.get(receiveKey);// 获得与该键对应的套接字对象PrintWriter out = new PrintWriter(s.getOutputStream(), true);// 创建输出流对象Iterator<String> keyIt1 = set.iterator();// 获得所有键的迭代器while (keyIt1.hasNext()) {String receiveKey1 = keyIt1.next();// 获得键，用于向客户端添加用户列表out.println(receiveKey1);// 发送信息out.flush();// 刷新输出缓冲区}}} else {// 转发接收的消息key = info.substring(info.indexOf("：发送给：") + 5, info.indexOf("：的信息是："));// 获得接收方的key值,即接收方的用户名String sendUser = info.substring(0, info.indexOf("：发送给："));// 获得发送方的key值,即发送方的用户名Set<String> set = map.keySet();// 获得集合中所有键的Set视图Iterator<String> keyIt = set.iterator();// 获得所有键的迭代器while (keyIt.hasNext()) {String receiveKey = keyIt.next();// 获得表示接收信息的键if (key.equals(receiveKey)&& !sendUser.equals(receiveKey)) {// 如果是发送方，但不是用户本身Socket s = map.get(receiveKey);// 获得与该键对应的套接字对象PrintWriter out = new PrintWriter(s.getOutputStream(), true);// 创建输出流对象out.println("MSG:"+info);// 发送信息out.flush();// 刷新输出缓冲区}}}}} catch (IOException e) {ta_info.append(socket + "已经退出。\n");}}}public static void main(String args[]) {Ltmb frame = new Ltmb();frame.setVisible(true);frame.createSocket();}public Ltmb() {super();setTitle("多个用户聊天");setBounds(100, 100, 385, 266);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);final JScrollPane scrollPane = new JScrollPane();getContentPane().add(scrollPane, BorderLayout.CENTER);ta_info = new JTextArea();scrollPane.setViewportView(ta_info);}
}

创建客户面板

package yiduiduo;import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;public class Kehuduan extends JFrame {private JTextArea ta_info;private JTextField tf_send;PrintWriter out;// 声明输出流对象/*** Launch the application* * @param args*/public static void main(String args[]) {EventQueue.invokeLater(new Runnable() {public void run() {try {Kehuduan frame = new Kehuduan();frame.setVisible(true);frame.createClientSocket();} catch (Exception e) {e.printStackTrace();}}});}public void createClientSocket() {try {Socket socket = new Socket("127.0.0.1", 1978);// 连接本地1978端口out = new PrintWriter(socket.getOutputStream(), true);// 创建输出流对象new ClientThread(socket).start();// 创建并启动线程对象} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}class ClientThread extends Thread {Socket socket;public ClientThread(Socket socket) {this.socket = socket;}public void run() {try {BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));// 创建输入流对象while (true) {String info = in.readLine();// 读取信息ta_info.append(info + "\n");// 在文本域中显示信息if (info.equals("88")) {break;// 结束线程}}} catch (IOException e) {e.printStackTrace();}}}private void send() {String info = tf_send.getText();// 获得输入的信息if (info.equals("")) {return;// 如果没输入信息则返回，即不发送}if (info.equals("88")) {System.exit(0);// 如果没输入信息是88，则退出}out.println(info);// 发送信息out.flush();// 刷新输出缓冲区tf_send.setText(null);// 清空文本框}public Kehuduan() {  //创建面板super();setTitle("客户互相聊天");setBounds(100, 100, 385, 266);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);final JPanel panel = new JPanel();getContentPane().add(panel, BorderLayout.SOUTH);final JLabel label = new JLabel();label.setText("输入聊天内容：");panel.add(label);tf_send = new JTextField();tf_send.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent e) {send();}});tf_send.setPreferredSize(new Dimension(180, 25));panel.add(tf_send);final JButton button = new JButton();button.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent e) {send();}});button.setText("发  送");panel.add(button);final JScrollPane scrollPane = new JScrollPane();getContentPane().add(scrollPane, BorderLayout.CENTER);ta_info = new JTextArea();scrollPane.setViewportView(ta_info);}}

结果如下