写一个java的swing点名程序，教师端：配置服务端端口号，发送给学生，开始进行电子点名，等待学生端发送个人信息，将收到的学生信息显示在界面中，点名结束后关闭服务端服务。同时还有随机点名功能，输入点名数量，在数据库中随机抽取相应数量的学生，对应学生端显示需要显示点名界面。学生信息显示学号，姓名，ip，每行表示一个学生。实现将本次点名数据保存至数据库。

好的，下面是一个简单的Java Swing点名程序的示例代码：

教师端：

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class TeacherFrame extends JFrame {

    private static final long serialVersionUID = 1L;

    private JTextArea messageArea;
    private JButton startButton;
    private JButton randomButton;

    private ServerSocket serverSocket;
    private List<Student> students;

    public TeacherFrame() {
        setTitle("教师端");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(600, 400);

        messageArea = new JTextArea();
        add(new JScrollPane(messageArea), BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        startButton = new JButton("开始点名");
        startButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                startAttendance();
            }
        });
        buttonPanel.add(startButton);

        randomButton = new JButton("随机点名");
        randomButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                randomAttendance();
            }
        });
        buttonPanel.add(randomButton);

        add(buttonPanel, BorderLayout.SOUTH);
    }

    private void startAttendance() {
        try {
            messageArea.append("等待学生加入...\n");
            serverSocket = new ServerSocket(8888);
            new Thread() {
                public void run() {
                    students = new ArrayList<Student>();
                    try {
                        while (true) {
                            Socket socket = serverSocket.accept();
                            Student student = new Student(socket);
                            students.add(student);
                            student.start();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }.start();
            startButton.setEnabled(false);
            randomButton.setEnabled(false);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void randomAttendance() {
        int count = Integer.parseInt(messageArea.getText().trim());
        List<Student> selectedStudents = new ArrayList<Student>();
        Random random = new Random();
        for (int i = 0; i < count; i++) {
            int index = random.nextInt(students.size());
            selectedStudents.add(students.get(index));
        }
        for (Student student : selectedStudents) {
            student.showAttendancePage();
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                TeacherFrame frame = new TeacherFrame();
                frame.setVisible(true);
            }
        });
    }

    class Student extends Thread {

        private Socket socket;
        private String name;
        private String ip;

        public Student(Socket socket) {
            this.socket = socket;
            this.ip = socket.getInetAddress().getHostAddress();
        }

        public void run() {
            try {
                AttendancePage attendancePage = new AttendancePage(this);
                attendancePage.setVisible(true);
                while (true) {
                    byte[] buffer = new byte[1024];
                    int len = socket.getInputStream().read(buffer);
                    String message = new String(buffer, 0, len);
                    if (message.startsWith("name:")) {
                        name = message.substring(5);
                        messageArea.append(name + "加入点名\n");
                    } else if (message.equals("attendance")) {
                        attendancePage.setAttendance(true);
                        messageArea.append(name + "已到\n");
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void showAttendancePage() {
            AttendancePage attendancePage = new AttendancePage(this);
            attendancePage.setVisible(true);
        }

        public String getIp() {
            return ip;
        }

        public String getName() {
            return name;
        }

    }

}

学生端：

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.IOException;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class StudentFrame extends JFrame {

    private static final long serialVersionUID = 1L;

    private JTextField nameField;
    private JButton joinButton;
    private JButton attendanceButton;

    private Socket socket;

    public StudentFrame() {
        setTitle("学生端");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 200);

        nameField = new JTextField();
        nameField.setPreferredSize(new Dimension(200, 30));
        add(nameField, BorderLayout.NORTH);

        JPanel buttonPanel = new JPanel();
        joinButton = new JButton("加入点名");
        joinButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                joinAttendance();
            }
        });
        buttonPanel.add(joinButton);

        attendanceButton = new JButton("已到");
        attendanceButton.setEnabled(false);
        attendanceButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                sendAttendance();
            }
        });
        buttonPanel.add(attendanceButton);

        add(buttonPanel, BorderLayout.SOUTH);
    }

    private void joinAttendance() {
        try {
            socket = new Socket("localhost", 8888);
            socket.getOutputStream().write(("name:" + nameField.getText()).getBytes());
            socket.getOutputStream().flush();
            joinButton.setEnabled(false);
            attendanceButton.setEnabled(true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void sendAttendance() {
        try {
            socket.getOutputStream().write("attendance".getBytes());
            socket.getOutputStream().flush();
            attendanceButton.setEnabled(false);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                StudentFrame frame = new StudentFrame();
                frame.setVisible(true);
            }
        });
    }

}

注意：以上代码仅为示例，可能存在一些不足之处，请根据具体需求进行修改和完善。另外，本示例未包含将点名数据保存至数据库的功能，需要自行添加。