TCP和UDP

TCP服务端：

package lx;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.net.*;
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 ServerSocketFrame extends JFrame {
    private JTextField tf_send;
    private JTextArea ta_info;
    private PrintWriter writer; // 声明PrintWriter类对象
    private BufferedReader reader; // 声明BufferedReader对象
    private ServerSocket server; // 声明ServerSocket对象
    private Socket socket; // 声明Socket对象socket
    
    public void getServer() {
        try {
            server = new ServerSocket(1978); // 实例化Socket对象
            ta_info.append("服务器套接字已经创建成功\n"); // 输出信息
            while (true) { // 如果套接字是连接状态
                ta_info.append("等待客户机的连接......\n"); // 输出信息
                socket = server.accept(); // 实例化Socket对象
                reader = new BufferedReader(new InputStreamReader(socket
                        .getInputStream())); // 实例化BufferedReader对象
                writer = new PrintWriter(socket.getOutputStream(), true);
                getClientInfo(); // 调用getClientInfo()方法
            }
        } catch (Exception e) {
            e.printStackTrace(); // 输出异常信息
        }
    }
    
    private void getClientInfo() {
        try {
            while (true) {
                String line = reader.readLine();// 读取客户端发送的信息
                if (line != null)
                    ta_info.append("接收到客户机发送的信息：" + line + "\n"); // 显示客户端发送的信息
            }
        } catch (Exception e) {
            ta_info.append("客户端已退出。\n"); // 输出异常信息
        } finally {
            try {
                if (reader != null) {
                    reader.close();// 关闭流
                }
                if (socket != null) {
                    socket.close(); // 关闭套接字
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static void main(String[] args) { // 主方法
        ServerSocketFrame frame = new ServerSocketFrame(); // 创建本类对象
        frame.setVisible(true);
        frame.getServer(); // 调用方法
    }
    
    public ServerSocketFrame() {
        super();
        setTitle("服务器端程序");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 379, 260);
        
        final JScrollPane scrollPane = new JScrollPane();
        getContentPane().add(scrollPane, BorderLayout.CENTER);
        
        ta_info = new JTextArea();
        scrollPane.setViewportView(ta_info);
        
        final JPanel panel = new JPanel();
        getContentPane().add(panel, BorderLayout.SOUTH);
        
        final JLabel label = new JLabel();
        label.setText("服务器发送的信息：");
        panel.add(label);
        
        tf_send = new JTextField();
        tf_send.setPreferredSize(new Dimension(150, 25));
        panel.add(tf_send);

        final JButton button = new JButton();
        button.addActionListener(new ActionListener() {
            public void actionPerformed(final ActionEvent e) {
                writer.println(tf_send.getText()); // 将文本框中信息写入流
                ta_info.append("服务器发送的信息是：" + tf_send.getText() + "\n"); // 将文本框中信息显示在文本域中
                tf_send.setText(""); // 将文本框清空
            }
        });
        button.setText("发  送");
        panel.add(button);

        final JPanel panel_1 = new JPanel();
        getContentPane().add(panel_1, BorderLayout.NORTH);

        final JLabel label_1 = new JLabel();
        label_1.setForeground(new Color(0, 0, 255));
        label_1.setFont(new Font("", Font.BOLD, 22));
        label_1.setText("一对一通信——服务器端程序");
        panel_1.add(label_1);
    }
}

TCP客户端：

package lx;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
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 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 ClientSocketFrame extends JFrame {
    private PrintWriter writer; // 声明PrintWriter类对象
    private BufferedReader reader; // 声明BufferedReader对象
    private Socket socket; // 声明Socket对象
    private JTextArea ta_info; // 创建JtextArea对象
    private JTextField tf_send; // 创建JtextField对象
    private void connect() { // 连接套接字方法
        ta_info.append("尝试连接......\n"); // 文本域中信息信息
        try { // 捕捉异常
            socket = new Socket("127.0.0.1", 1978); // 实例化Socket对象
            while (true) {
                writer = new PrintWriter(socket.getOutputStream(), true);
                reader = new BufferedReader(new InputStreamReader(socket
                        .getInputStream())); // 实例化BufferedReader对象
                ta_info.append("完成连接。\n"); // 文本域中提示信息
                getServerInfo();
            }
        } catch (Exception e) {
            e.printStackTrace(); // 输出异常信息
        }
    }
    
    public static void main(String[] args) { // 主方法
        ClientSocketFrame clien = new ClientSocketFrame(); // 创建本例对象
        clien.setVisible(true); // 将窗体显示
        clien.connect(); // 调用连接方法
    }
    
    private void getServerInfo() {
        try {
            while (true) {
                if (reader != null) {
                    String line = reader.readLine();// 读取服务器发送的信息
                    if (line != null)
                        ta_info.append("接收到服务器发送的信息：" + line + "\n"); // 显示服务器端发送的信息
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();// 关闭流
                }
                if (socket != null) {
                    socket.close(); // 关闭套接字
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    /**
     * Create the frame
     */
    public ClientSocketFrame() {
        super();
        setTitle("客户端程序");
        setBounds(100, 100, 361, 257);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final JPanel panel = new JPanel();
        getContentPane().add(panel, BorderLayout.NORTH);

        final JLabel label = new JLabel();
        label.setForeground(new Color(0, 0, 255));
        label.setFont(new Font("", Font.BOLD, 22));
        label.setText("一对一通信——客户端程序");
        panel.add(label);

        final JPanel panel_1 = new JPanel();
        getContentPane().add(panel_1, BorderLayout.SOUTH);

        final JLabel label_1 = new JLabel();
        label_1.setText("客户端发送的信息：");
        panel_1.add(label_1);

        tf_send = new JTextField();
        tf_send.setPreferredSize(new Dimension(140, 25));
        panel_1.add(tf_send);

        final JButton button = new JButton();
        button.addActionListener(new ActionListener() {
            public void actionPerformed(final ActionEvent e) {
                writer.println(tf_send.getText()); // 将文本框中信息写入流
                ta_info.append("客户端发送的信息是：" + tf_send.getText()
                        + "\n"); // 将文本框中信息显示在文本域中
                tf_send.setText(""); // 将文本框清空
            }
        });
        button.setText("发  送");
        panel_1.add(button);

        final JScrollPane scrollPane = new JScrollPane();
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        ta_info = new JTextArea();
        scrollPane.setViewportView(ta_info);
        //
    }
    
}

结果：

UDP服务端：

package lx;

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.Vector;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class ClientOneToMany_ServerFrame extends JFrame {
    private JTextArea ta_info;
    private ServerSocket server; // 声明ServerSocket对象
    private Socket socket; // 声明Socket对象socket
    private Vector<Socket> vector = new Vector<Socket>();// 用于存储连接到服务器的客户端套接字对象
    
    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
                vector.add(socket);// 将套接字对象添加到向量对象中
                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
                    for (Socket s : vector) {// 遍历所有客户端套接字对象
                        if (s != socket) {// 如果不是发送信息的套接字对象
                            PrintWriter out = new PrintWriter(s
                                    .getOutputStream(), true);// 创建输出流对象
                            out.println(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");
                vector.remove(socket);// 移除退出的客户端套接字
            }
        }
    }
    
    /**
     * Launch the application
     * 
     * @param args
     */
    public static void main(String args[]) {
        ClientOneToMany_ServerFrame frame = new ClientOneToMany_ServerFrame();
        frame.setVisible(true);
        frame.createSocket();
    }
    
    /**
     * Create the frame
     */
    public ClientOneToMany_ServerFrame() {
        super();
        setTitle("客户端一对多通信——服务器端程序");
        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);
    }
}

UDP客户端：

package lx;

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 ClientOneToMany_ClientFrame 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 {
                    ClientOneToMany_ClientFrame frame = new ClientOneToMany_ClientFrame();
                    frame.setVisible(true);
                    frame.createClientSocket();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    
    public void createClientSocket() {
        try {
            Socket socket = new Socket("127.0.0.1", 1978);// 创建套接字对象
            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
    }
    /**
     * Create the frame
     */
    public ClientOneToMany_ClientFrame() {
        super();
        setTitle("客户端一对多通信——客户端程序");
        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();// 调用方法发送信息
            }
        });
        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();// 调用方法发送信息
            }
        });
        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：