buttonlistener3.java

学生成绩管理系统：能输入学科

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;

/**
 *
 * @author HSM
 */
class ButtonListener3 implements ActionListener {

    public void actionPerformed(ActionEvent e) {
        final JFrame frame1 = new JFrame("Sorce_Search");
        Container container = frame1.getContentPane();
        frame1.setSize(600, 400);
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        int screenHeight = screenSize.height;
        int screenWidth = screenSize.width;
        int x = (screenWidth - frame1.getWidth()) / 2;
        int y = (screenHeight - frame1.getHeight()) / 2;
        frame1.setLocation(x, y);
        frame1.setVisible(true);
        frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JLabel jLabel1 = new JLabel("成绩查询");
        JLabel jLabel2 = new JLabel("学号：");
        JLabel jLabel3 = new JLabel("课程：");
        JLabel jLabel4 = new JLabel("查询结果：");
        JLabel jLabel5 = new JLabel("        ");
        JLabel jLabel6 = new JLabel("        ");
        JLabel jLabel7 = new JLabel("        ");
        JLabel jLabel8 = new JLabel("        ");
        final JTextField jtf1 = new JTextField(9);
        final JTextField jtf2 = new JTextField(9);
        JTextField jtf3 = new JTextField(10);
        JTextField jtf4 = new JTextField(10);
        JPanel p1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
        JPanel p2 = new JPanel(new FlowLayout());
        JPanel p3 = new JPanel(new FlowLayout());
        JPanel p4 = new JPanel(new FlowLayout());
        JPanel p5 = new JPanel(new FlowLayout(FlowLayout.CENTER,10,5));
        JPanel p6 = new JPanel(new FlowLayout());
        JPanel p7 = new JPanel(new BorderLayout());
        JPanel p8 = new JPanel(new BorderLayout());
        JButton jbtCx = new JButton("   查询   ");
        JButton jbtQx = new JButton("   取消   ");
        final JTextArea jtArea = new JTextArea(12,7);
//        jtArea.setBounds(new Rectangle(25, 64, 98, 45));
        
        p1.add(jLabel1);
        p2.add(jLabel2);
        p2.add(jtf1);
        p3.add(jLabel3);
        p3.add(jtf2);
        p4.add(jbtCx);
        p4.add(jbtQx);
        p5.add(p2);
        p5.add(p3);
        p5.add(p4);
        p7.add(jLabel4,BorderLayout.NORTH);
        p7.add(jtArea,BorderLayout.CENTER);
        p8.add(p1,BorderLayout.NORTH);
        p8.add(p5,BorderLayout.CENTER);
        p8.add(p7,BorderLayout.SOUTH);
        
        container.add(jLabel5, BorderLayout.NORTH);
        container.add(jLabel6, BorderLayout.SOUTH);
        container.add(jLabel7, BorderLayout.WEST);
        container.add(jLabel8, BorderLayout.EAST);
        container.add(p8, BorderLayout.CENTER);
        
        jbtQx.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                frame1.dispose();
            }
        });
        jbtCx.addActionListener(new ActionListener() {

            @SuppressWarnings("empty-statement")
            public void actionPerformed(ActionEvent e) {
                String str = jtf2.getText();
                String strNumber = jtf1.getText();
                File file = new File(str);
                int flag = 0;
                if(file.exists()){
                    DataInputStream input = null;
                    try {
                        input = new DataInputStream(new FileInputStream(str));
                        String strXh = null;
                        String strName = null;
                        String strDate = null;
                        double score = 0;
                        while (input.available() != 0) {
                            strXh = input.readUTF();
                            strName = input.readUTF();
                            score = input.readDouble();
                            strDate = input.readUTF();
                            if (strXh.equals(strNumber)) {
                                flag = 1;
                                break;
                            }
                        }
                        if (flag == 1) {
                            String stResult = " 学号：" + strXh + "   姓名：" + strName + "   课程：" + str + "   成绩：" + score + "   考试时间：" + strDate;
                            jtArea.setText(stResult);
                        }
                        else
                             JOptionPane.showMessageDialog(null, "该同学本门课程未录入成绩！", "信息", JOptionPane.INFORMATION_MESSAGE);      
                    } catch (IOException ex) {
                        Logger.getLogger(ButtonListener3.class.getName()).log(Level.SEVERE, null, ex);
                    } finally {
                        try {
                            input.close();
                        } catch (IOException ex) {
                            Logger.getLogger(ButtonListener3.class.getName()).log(Level.SEVERE, null, ex);
                        }
                    }
                }
                else
                    JOptionPane.showMessageDialog(null, "该同学本门课程未录入成绩！", "信息", JOptionPane.INFORMATION_MESSAGE);
            }
        });
    }

}