java+mysql+学生课程管理系统的实现

开发一个简单的数据库应用程序。

要求如下：

使用附件中的SQL语句初始化数据库，完成一个控制台应用（也可用SWING应用或Web应用）程序的开发，该程序应该能够提供如下功能：

1. 用户通过菜单可以选择不同操作功能。

2. 用户可以查询所有课程信息。

3. 用户可以新增课程信息。

4. 用户可以修改现有的课程信息。

5. 用户可以删除指定课程的信息。

6. 用户可以查询指定某门课程的选课情况。

参考资料：

基于Java的GUI界面+SQL Server数据库课程信息管理系统

学生选课管理系统的设计与实现

在eclipse不小心删掉了java文件怎么找回？

Java Swing开发知识总结

GetDBConnection.java

import java.sql.*;
public class GetDBConnection {public static Connection connectDB(String DBName,String id,String p) {Connection con = null;String uri = "jdbc:mysql://localhost:3308/"+DBName+"?useSSL=true&characterEncoding=utf-8";try{  Class.forName("com.mysql.jdbc.Driver");//加载JDBC-MySQL驱动}catch(Exception e){}try{  con = DriverManager.getConnection(uri,id,p); //连接代码}catch(SQLException e){}return con;}
}

LoginWindow.java


import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public  class LoginWindow extends JFrame{//标签private JLabel lable1;private JLabel lable2;//文本框private JTextField text1;private JTextField text2;//按钮private JButton bt1;private JButton bt2;  //构造函数public LoginWindow(){this.init();this.addComponent();this.addListener();}public void init(){this.setSize(500,400);this.setVisible(true);this.setTitle("登录界面");this.setLayout(null);this.setLocation(700, 300);this.getContentPane().setBackground(Color.orange);}private void addComponent(){lable1 = new JLabel("用户名");lable1.setSize(100,70);lable1.setLocation(100,80);this.add(lable1);lable2 = new JLabel("密    码");lable2.setSize(100,70);lable2.setLocation(100,130);this.add(lable2);text1 = new JTextField();text1.setSize(150,30);text1.setLocation(160,100);this.add(text1);text2 = new JTextField();text2.setSize(150,30);text2.setLocation(160,150);this.add(text2);bt1 = new JButton("登录");bt1.setSize(70,30); bt1.setLocation(140,195);this.add(bt1);bt2 = new JButton("退出");bt2.setSize(70,30);bt2.setLocation(250,195);this.add(bt2);this.setBackground(Color.GRAY);//设置单击关闭按钮时的默认操作this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}private void addListener(){bt1.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){if(text1.getText().equals("abc")&&text2.getText().equals("123")){new Menu();dispose();}else{JOptionPane.showMessageDialog(null, "登陆密码错误");}}});bt2.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){dispose();}});}public static void main(String[] args) {new LoginWindow();}}

Menu.java

import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public   class Menu extends JFrame implements ActionListener {JButton bt1;JButton bt2;JButton bt3;JButton bt4;JButton bt5;JPanel panel;JPanel panel2;JLabel label1;JLabel label2;Menu(){this.setSize(900, 700);// 设置尺寸this.setTitle("学生课程管理系统");this.setLayout(null);this.setLocation(400,200);// 设置坐标this.getContentPane().setBackground(Color.orange);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);bt1=new JButton("查询课程");bt1.setSize(150, 50);bt1.setLocation(150, 400);bt1.addActionListener(new queryActionPerformed());bt1.setActionCommand("查询课程");bt2=new JButton("删除课程");bt2.setSize(150, 50);bt2.setLocation(150, 500);bt2.addActionListener(this);bt2.setActionCommand("删除课程");bt3=new JButton("添加课程");bt3.setSize(150, 50);bt3.setLocation(550, 400);bt3.addActionListener(this);bt3.setActionCommand("添加课程");bt4=new JButton("修改课程");bt4.setSize(150, 50);bt4.setLocation(550, 500);bt4.addActionListener(this);bt4.setActionCommand("修改课程");    bt5=new JButton("查找新增课程");bt5.setSize(150, 50);bt5.setLocation(350, 450);bt5.addActionListener(this);bt5.setActionCommand("查找新增课程");   this.add(bt1);this.add(bt2);this.add(bt3);this.add(bt4);this.add(bt5);panel=new JPanel(); // 创建内容面板panel.setLocation(100, 20);panel.setLayout(null);this.add(panel);panel2=new JPanel();panel2.setSize(650,350);panel2.setLocation(100, 20);panel2.setLayout(null);panel2.setBackground(Color.white);label1=new JLabel(); // 创建一个标签label2=new JLabel();label1.setText("WELCOME");label2.setText("欢迎登陆课程管理系统");label1.setLocation(270,20);label1.setSize(500, 200);label2.setLocation(165,60);label2.setSize(500, 200);panel2.add(label1);panel2.add(label2);label1.setFont( (new Font("仿宋",Font.BOLD,30)));label2.setFont( (new Font("仿宋",Font.BOLD,30)));this.add(panel2);   panel2.setVisible(true);this.setVisible(true);}public class queryActionPerformed implements ActionListener{public void actionPerformed(ActionEvent e){new FindCourse().setVisible(true);}}@Overridepublic void actionPerformed(ActionEvent e) {JButton bt=(JButton )e.getSource();//移除上一个面板if(bt!=null){this.remove(panel2);this.remove(panel);}if(bt.getText().equals("查询课程")){/*panel=new FindCourse();panel.setLocation(100, 20);this.add(panel);this.repaint();*/bt1=new JButton("查询课程");bt1.addActionListener(new queryActionPerformed());}     else{if(bt.getText().equals("添加课程")){panel=new AddCourse();panel.setLocation(100, 20);this.add(panel);this.repaint();} else{if(bt.getText().equals("删除课程")){panel=new DeleteCourse();panel.setLocation(100, 20);this.add(panel);this.repaint();}else{ if(bt.getText().equals("修改课程")){panel=new UpdateCourse();panel.setLocation(100, 20);this.add(panel);this.repaint();}else{ if(bt.getText().equals("查找新增课程")){panel=new FindNewCourse();panel.setLocation(100, 20);this.add(panel);this.repaint();}}}   }}
}
}

AddCourse.java

import java.awt.Color;
import java.awt.Font;
import java.sql.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public  class AddCourse extends JPanel implements ActionListener{JLabel cname;JLabel cno;JLabel cpno;JLabel credit;JTextField cnametext;JTextField cnotext;JTextField cpnotext;JTextField credittext;JButton Addbt;public AddCourse() {this.setSize(650,350);this.setLocation(100, 20);this.setLayout(null);this.setBackground(Color.WHITE);               cname=new JLabel("需添加的课程名称");cname.setSize(200,30);cname.setLocation(60, 20);     this.add(cname);cnametext=new JTextField();cnametext.setSize(120,30);cnametext.setLocation(180, 20);this.add(cnametext);cno=new JLabel("需添加的课程号");cno.setSize(200,30);cno.setLocation(60, 60);this.add(cno);cnotext=new JTextField();cnotext.setSize(120,30);cnotext.setLocation(180, 60);this.add(cnotext);cpno=new JLabel("需添加的先修课程号");cpno.setSize(200,30);cpno.setLocation(60, 100);            this.add(cpno);cpnotext=new JTextField();cpnotext.setSize(120,30);cpnotext.setLocation(180, 100);this.add(cpnotext);       credit=new JLabel("需添加的课程学分");credit.setSize(200,30);credit.setLocation(60, 140);this.add(credit);credittext=new JTextField();credittext.setSize(120,30);credittext.setLocation(180, 140);this.add(credittext);this.setVisible(true);Addbt=new JButton("添加");Addbt.setSize(80,30);Addbt.setLocation(180, 200);this.add(Addbt);  Addbt.addActionListener(this);           } @Overridepublic void actionPerformed(ActionEvent e) {String addcname=cnametext.getText();String addcno=cnotext.getText();String addcpno=cpnotext.getText();String addcredit=credittext.getText();Connection con;Statement sql; con = GetDBConnection.connectDB("EDUC","root","");if(con == null ) return; try {sql=con.createStatement();//创建SQL语句执行对象     String  strSQL="insert into course values('"+addcno+"','"+addcname+"','"+addcpno+"','"+addcredit+"')";String  strSQL1="(Select* from  course where cname='"+addcname+"' )";if(!addcname.trim().equals("")&&!addcno.trim().equals("")&&!addcpno.trim().equals("")&&!addcredit.trim().equals("")){ResultSet rs1=sql.executeQuery(strSQL1);if(rs1.next())     {JOptionPane.showMessageDialog(null,"该课程已存在");     }else {int rs=sql.executeUpdate(strSQL);if(rs==1) {JOptionPane.showMessageDialog(null,"课程添加成功");}else{JOptionPane.showMessageDialog(null,"课程添加失败");}}}else{ JOptionPane.showMessageDialog(null,"课程信息输入有误，请重新输入！");}          con.close();     //关闭数据库连接    }   catch (SQLException ex) {System.out.println("数据库连接或者是数据库操作失败");}}
}

FindNewCourse.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public  class FindNewCourse extends JPanel implements ActionListener{JLabel cname;JLabel cno;JLabel cpno;JLabel credit;JTextField cnametext;JTextField cnotext;JTextField cpnotext;JTextField credittext;JButton Findbt;JLabel Inputlabel;JTextField Inputtext;public FindNewCourse() {this.setSize(650,350);this.setLocation(100, 20);this.setLayout(null);this.setBackground(Color.WHITE);    Inputlabel=new JLabel("请输入需要查找的课程名称");Inputlabel.setSize(300,50);Inputlabel.setLocation(320, 45);this.add(Inputlabel);Inputtext=new JTextField();Inputtext.setSize(160,40);Inputtext.setLocation(480, 45);this.add(Inputtext);cname=new JLabel("课程名称");cname.setSize(200,30);cname.setLocation(60, 60);      this.add(cname);cnametext=new JTextField();cnametext.setSize(120,30);cnametext.setLocation(180, 60);this.add(cnametext);cno=new JLabel("课程号");cno.setSize(200,30);cno.setLocation(60, 20);this.add(cno);cnotext=new JTextField();cnotext.setSize(120,30);cnotext.setLocation(180, 20);this.add(cnotext);cpno=new JLabel("先修课程号");cpno.setSize(200,30);cpno.setLocation(60, 100);            this.add(cpno);cpnotext=new JTextField();cpnotext.setSize(120,30);cpnotext.setLocation(180, 100);this.add(cpnotext);       credit=new JLabel("课程学分");credit.setSize(200,30);credit.setLocation(60, 140);this.add(credit);credittext=new JTextField();credittext.setSize(120,30);credittext.setLocation(180, 140);this.add(credittext);this.setVisible(true);Findbt=new JButton("查找");Findbt.setSize(80,30);Findbt.setLocation(400, 100);this.add(Findbt);  Findbt.addActionListener(this);  }@Overridepublic void actionPerformed(ActionEvent e) {String inputName=Inputtext.getText();Connection con;Statement sql; con = GetDBConnection.connectDB("EDUC","root","");if(con == null ) return; try {sql=con.createStatement();//创建SQL语句执行对象     String  strSQL="(Select* from  course where cname='"+inputName+"' )";ResultSet rs=sql.executeQuery(strSQL);if(rs.next()){cnotext.setText(rs.getString(1)); cnametext.setText(rs.getString(2));cpnotext.setText(rs.getString(3));credittext.setText(rs.getString(4));}else{ JOptionPane.showMessageDialog(null, "您查询的课程不存在，请重新输入");}con.close();//关闭数据库连接   } catch (SQLException ex) {System.out.println("数据库连接或者是数据库操作失败");}}}

UpdateCourse.java


import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;public  class UpdateCourse extends JPanel implements ActionListener {JLabel Inputlabel;JTextField Inputtext;JLabel cname;JLabel cno;JLabel cpno;JLabel credit;JTextField cnametext;JTextField cnotext;JTextField cpnotext;JTextField credittext;JButton Updatebt;public UpdateCourse() {this.setSize(650,350);this.setLocation(100, 20);this.setLayout(null);this.setBackground(Color.white);cname=new JLabel("需修改的课程名称");cname.setSize(200,30);cname.setLocation(60, 20);     this.add(cname);cnametext=new JTextField();cnametext.setSize(120,30);cnametext.setLocation(180, 20);this.add(cnametext);cno=new JLabel("需修改的课程号");cno.setSize(200,30);cno.setLocation(60, 60);this.add(cno);cnotext=new JTextField();cnotext.setSize(120,30);cnotext.setLocation(180, 60);this.add(cnotext);cpno=new JLabel("需修改的先修课程号");cpno.setSize(200,30);cpno.setLocation(60, 100);            this.add(cpno);cpnotext=new JTextField();cpnotext.setSize(120,30);cpnotext.setLocation(180, 100);this.add(cpnotext);       credit=new JLabel("需修改的课程学分");credit.setSize(200,30);credit.setLocation(60, 140);this.add(credit);credittext=new JTextField();credittext.setSize(120,30);credittext.setLocation(180, 140);this.add(credittext);this.setVisible(true);Updatebt=new JButton("修改");Updatebt.setSize(80,30);Updatebt.setLocation(180, 200);this.add(Updatebt);  Updatebt.addActionListener(this);            } @Overridepublic void actionPerformed(ActionEvent e) {String updatecname=cnametext.getText();String updatecpno=cpnotext.getText();String updatecno=cnotext.getText();String updatecredit=credittext.getText();Connection con;Statement sql;           con = GetDBConnection.connectDB("EDUC","root","");if(con == null ) return; try {sql=con.createStatement();         //创建SQL语句执行对象String  strSQL1="update course set cpno='"+updatecpno+"' where cname='"+updatecname+"'";String  strSQL2="update course set cno='"+updatecno+"' where cname='"+updatecname+"'";String  strSQL3="update course set credit='"+updatecredit+"' where cname='"+updatecname+"'";int rs1=sql.executeUpdate(strSQL1);int rs2=sql.executeUpdate(strSQL2);int rs3=sql.executeUpdate(strSQL3);if(rs1==1&&rs2==1&&rs3==1) {JOptionPane.showMessageDialog(null,"课程修改成功");}else{JOptionPane.showMessageDialog(null,"课程修改失败");}con.close();   //关闭数据库连接  } catch (SQLException ex) {System.out.println("数据库连接或者是数据库操作失败");}}}

通过查找新增课程按钮，检查修改课程的信息是否有误：

DeleteCourse.java


import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.*;
public  class DeleteCourse extends JPanel implements ActionListener{JLabel cname;JTextField cnametext;JButton Delbt;JTable table;   public DeleteCourse() {     this.setSize(650,350);this.setLocation(100, 20);this.setLayout(null);this.setBackground(Color.WHITE);cname=new JLabel("请输入需要删除的课程名称");cname.setSize(200,50);cname.setLocation(50, 50);this.add(cname);cnametext=new JTextField();cnametext.setSize(160,40);cnametext.setLocation(220, 50);this.add(cnametext);Delbt=new JButton("确认删除");Delbt.setSize(90,38);Delbt.setLocation(200, 150);this.add(Delbt); Delbt.addActionListener(this);/*Object[] columnTitle= {"课程号","课程名称","先修课程号","课程学分"};//表格行对象数据Object[][] tableData= {new Object[] {"1","数据库","5","4分"},new Object[] {"2","数学","null","2分"},new Object[] {"3","信息系统","1","4分"},  new Object[] {"4","操作系统","6","3分"},new Object[] {"5","数据结构","7","2分"},new Object[] {"6","数据处理","null","4分"},  new Object[] {"7","PASCAL语言","6","4分"},new Object[] {"8","大学英语","null","4分"},new Object[] {"9","计算机网络","null","4分"},  new Object[] {"10","人工智能","null","2分"}, };//创建表格JTable  table=new JTable(tableData,columnTitle);JScrollPane scrollpane=new JScrollPane(table);scrollpane.setSize(550,250);scrollpane.setLocation(60, 20);this.add(scrollpane);this.setVisible(true);*/}@Overridepublic void actionPerformed(ActionEvent e) {String delName=cnametext.getText();Connection con;Statement sql; con = GetDBConnection.connectDB("EDUC","root","");if(con == null ) return; try {                    sql=con.createStatement();//创建SQL语句执行对象String strSQL="delete from  course where cname='"+delName+"' ";                 int rs=sql.executeUpdate(strSQL);if(rs==1) {JOptionPane.showMessageDialog(null,"课程删除成功");}else{JOptionPane.showMessageDialog(null,"课程删除失败");}con.close();                 //关闭数据库连接    } catch (SQLException ex) {System.out.println("数据库连接或者是数据库操作失败");
}
}
}

通过点击查找新增课程按钮，检查课程是否删除成功：

FindCourse.java

import java.awt.*;
import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class FindCourse extends JFrame{JTextArea show;JButton button1,button2;JComboBox comoBox;static Statement sql;static{try{Class.forName("com.mysql.jdbc.Driver");Connection con=GetDBConnection.connectDB("EDUC","root","");sql=con.createStatement();}catch(Exception e){}}@SuppressWarnings("unchecked")public FindCourse(){show=new JTextArea(5,10);button1=new JButton("查询所有课程信息");button1.addActionListener(new FindAllCourse());Container container=getContentPane();container.setLayout(new BorderLayout());JPanel panel=new JPanel();JPanel mainpanel=new JPanel();String items[]={"请选择","数据库","数学","信息系统","操作系统","数据结构","数据处理","PASCAL语言","大学英语","计算机网络","人工智能"};comoBox=new JComboBox(items);button2=new JButton("按课程名称查询");button2.addActionListener(new FindCourseByCname());panel.add(button2);panel.add(comoBox);panel.setVisible(true);mainpanel.add(panel);mainpanel.setBackground(Color.orange);panel=new JPanel();panel.add(button1);panel.setBackground(Color.orange);container.add(mainpanel,BorderLayout.NORTH);container.add(panel,BorderLayout.SOUTH);container.add(new JScrollPane(show),BorderLayout.CENTER);setTitle("查询课程");setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);setSize(750,400);Toolkit kit = Toolkit.getDefaultToolkit();Dimension screenSize = kit.getScreenSize();//获取屏幕尺寸对象int screenWidth = screenSize.width/2;//水平位置int screenHeight = screenSize.height/2;//垂直位置int height = this.getHeight();int width = this.getWidth();setLocation(screenWidth-width/2, screenHeight-height/2);//屏幕宽度(高度)减去窗口宽度(高度)，然后在除以2，就是居中了setVisible(true);}class FindAllCourse implements ActionListener{public void actionPerformed(ActionEvent e){try{String sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc"+ " where student.sno = sc.sno AND sc.cno = course.cno  ";ResultSet rs=sql.executeQuery(sqlStr);show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");while(rs.next()){show.append(rs.getString(1)+" "+"\t");show.append(rs.getString(2)+" "+"\t");show.append(rs.getString(3)+" "+"\t");show.append(rs.getString(4)+" "+"\t");show.append(rs.getString(5)+" "+"\t");show.append(rs.getString(6)+" "+"\t");show.append(rs.getString(7)+"\n");}}catch(Exception ee){}}}class FindCourseByCname implements ActionListener{public void actionPerformed(ActionEvent e){try{String sqlStr="";String course=comoBox.getSelectedItem().toString();if(course.equals("数据库")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc"+ " where student.sno = sc.sno AND sc.cno = course.cno AND cname='数据库'";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("数学")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = '数学'";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("信息系统")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = 信息系统' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("操作系统")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = '操作系统' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("数据结构")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = '数据结构' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("数据处理")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = '数据处理' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("PASCAL语言")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = 'PASCAL语言' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("大学英语")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = '大学英语' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("计算机网络")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = '计算机网络' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}else if(course.equals("人工智能")){sqlStr="select student.sno,student.sname,course.cno,course.cname,course.cpno,course.credit,sc.grade from student,course,sc "+ "where student.sno = sc.sno AND sc.cno = course.cno AND cname = '人工智能' ";show.setText("");show.append("学号\t姓名\t课程号\t课程名\t先修课程号\t课程学分\t成绩"+"\n");}ResultSet rs=sql.executeQuery(sqlStr);while(rs.next()){show.append(rs.getString(1)+" "+"\t");show.append(rs.getString(2)+" "+"\t");show.append(rs.getString(3)+" "+"\t");show.append(rs.getString(4)+" "+"\t");show.append(rs.getString(5)+" "+"\t");show.append(rs.getString(6)+" "+"\t");show.append(rs.getString(7)+"\n ");}}catch(Exception ee){}}}
}

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查询所有课程信息：

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