Java程序（一）

package com.xaccp;

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Rectangle;
import javax.swing.JScrollPane;
import javax.swing.JList;
import javax.swing.JButton;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.*;
import java.sql.*;
import java.util.Vector;
import java.io.*;
import java.awt.*;

public class Frame1 extends JFrame {
    public Frame1() {
        try {
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    private void jbInit() throws Exception {
        getContentPane().setLayout(null);
        lblInfo.setText("学生信息");
        lblInfo.setBounds(new Rectangle(21, 47, 72, 24));
        jScrollPane1.setBounds(new Rectangle(19, 72, 246, 155));
        btnSave.setBounds(new Rectangle(20, 252, 110, 26));
        btnSave.setEnabled(false);
        btnSave.setText("保存成文件");
        btnSave.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                btnSave_actionPerformed(e);
            }
        });
        btnRead.setBounds(new Rectangle(147, 251, 74, 26));
        btnRead.setText("读取");
        btnRead.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                btnRead_actionPerformed(e);
            }
        });
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("学生成绩管理");

        this.getContentPane().add(lblInfo);
        this.getContentPane().add(jScrollPane1);
        this.getContentPane().add(btnSave);
        this.getContentPane().add(btnRead);
        jScrollPane1.getViewport().add(lstInfo);
        this.setBounds(100, 200, 300, 350);
        this.setVisible(true);
    }

    public static void main(String[] args) {
        new Frame1();
    }
    Vector v;
    JLabel lblInfo = new JLabel();
    JScrollPane jScrollPane1 = new JScrollPane();
    JList lstInfo = new JList();
    JButton btnSave = new JButton();
    JButton btnRead = new JButton();
    public void btnSave_actionPerformed(ActionEvent e) {
        try {
            File f = new File("d:\\aa.txt");
            FileWriter fw = new FileWriter(f);
            BufferedWriter bw = new BufferedWriter(fw);
            for (int i = 0; i < v.size(); i++) {
                bw.write(v.get(i).toString()+"\r\n");
            }
            javax.swing.JOptionPane.showMessageDialog(this,
                    "文件" + f.getName() + "保存成功!");
            bw.close();
            fw.close();
        } catch (HeadlessException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        }

    }

    public void btnRead_actionPerformed(ActionEvent e) {
        try {
            DBManager dbm = new DBManager();
            String strSql="select * from student";
            ResultSet rs=dbm.executeQuerry(strSql);
            v=new Vector();
            while(rs.next()){
               v.add("姓名:"+rs.getString("stuName"));
               v.add("性别:"+rs.getString("stuSex"));
               v.add("成绩:"+rs.getString("stuScore"));
               v.add(" ");
            }
            this.lstInfo.setListData(v);
            btnRead.setEnabled(false);
            this.btnSave.setEnabled(true);
            rs.close();
            dbm.closeConnection();

        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }
}