JDBC实现学生信息管理系统（仅增删改查）

思路：将程序简单的分为了一个主要的菜单类和其他的五个功能类，实现对数据库的信息的增删改查。

缺点：写了大量重复代码，实现的功能却不多，将每个类的界面和功能都写到了一个方法里，类与类之间完全分开，没有一点关联性

涉及知识点：

1数据库的连接

2.executeUpdate与excuteQuery的区别

3.Statement与PreparedStatement的区别

4.swing销毁当前窗口的方法

public class Menu extends JFrame{
	private JScrollPane scrollpane;
	 private JButton button1, button2, button3,button4,button5;
	 private JPanel panel;
public static void main(String[] args) {
	new Menu().initView();
}
private void initView() {
	 
	 this.setTitle("学生信息管理系统");
	 
	 /*id=new JLabel("学号");
	 name=new JLabel("姓名");
	 school=new JLabel("学院");
	 date=new JLabel("入学日期");*/
	 button1=new JButton("添加");
	 button2=new JButton("修改");
	 button3=new JButton("查询");
	 button4=new JButton("删除");
	 button5=new JButton("浏览");
	 panel=new JPanel();
	 panel.add(button1);
	 panel.add(button2);
	 panel.add(button3);
	 panel.add(button4);
	 panel.add(button5);
	 this.add(panel);
	 button1.addActionListener(new ActionListener() {
		
		@Override
		public void actionPerformed(ActionEvent e) {
			new Add().view();
			
		}
	});
	 button2.addActionListener(new ActionListener() {
		
		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub
			new Change().view();
		}
	});
	 button3.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				new Ask();
			}
		});
	 button4.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				new Delete();
			}
		});
	 button5.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				new Look().view();
				
			}
		});
	 this.setSize(450, 450);
	 this.setLocation(150, 150);
	 this.setVisible(true);

	 setDefaultCloseOperation(EXIT_ON_CLOSE);
	 
}

}

public class Add extends JFrame{
	 private JLabel id,name,school,date;
	 private JTextField fieldid,fieldname,fieldschool,fielddate;
	 private JButton button1, button2;
	 private JPanel panelid,panelbutton,panelname,panelschool,paneldate;
	 private String driver;
		private String url;
		private String user;
		private String pass;
	 public void view() {
		 id=new JLabel("学号");
		 name=new JLabel("姓名");
		 school=new JLabel("学院");
		 date=new JLabel("入学日期");
		 button1=new JButton("确认");
		 button2=new JButton("重置");
		 fieldid=new JTextField("",20);
		 fielddate=new JTextField("",20);
		 fieldname=new JTextField("",20);
		 fieldschool=new JTextField("",20);
		 panelbutton=new JPanel(new GridLayout(1,1));
		 panelid=new JPanel();
		 panelname=new JPanel();
		 panelschool=new JPanel();
		 paneldate=new JPanel();
		 panelbutton.add(button1);
		 panelbutton.add(button2);
		
		 panelid.add(id);
		 panelid.add(fieldid);
		 panelname.add(name);
		 panelname.add(fieldname);
		 panelschool.add(school);
		 panelschool.add(fieldschool);
		 paneldate.add(date);
		 paneldate.add(fielddate);
		 
		 button1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				Connection conn=null;
				String sql="insert into sd(id,name,schol,date)"+"values(?,?,?,?)";
         
				try {
				Properties props = new Properties();// 加载文件属性
				props.load(new FileInputStream("src\\jdbc.properties"));// 创建一个文件输入流
				driver = props.getProperty("driver");// 获取数据库驱动
				url = props.getProperty("url");// 获取想要操作的数据库及其信息
				user = props.getProperty("user");// 获取用户名
				pass = props.getProperty("password");// 获取密码
				}catch(Exception e1) {
					e1.printStackTrace();
				}
				try {
					Class.forName(driver);
					System.out.println("数据库连接成功");
					conn = DriverManager.getConnection(url, user, pass); 
					PreparedStatement ps=conn.prepareStatement(sql);
					ps.setString(1,fieldid.getText());
                    ps.setString(2,fieldname.getText());
                    ps.setString(3,fieldschool.getText());
                    ps.setString(4,fielddate.getText());
                  
 
                    ps.executeUpdate();
				}catch(Exception e2){
					e2.printStackTrace();
				}finally {
					try{
                        conn.close();
                        System.out.println("MySQL 关闭成功");
                    }catch (SQLException c){
                        System.out.println("MySQL 关闭失败 ");
                        c.printStackTrace();
                    }
				}
			}
		});
		 button2.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				fieldid.setText("");
				fieldname.setText("");
				fieldschool.setText("");
				fielddate.setText("");
				
			}
		});
		 
		 
		 this.setLayout(new GridLayout(9,1));
		 this.add(panelid);
		 this.add(panelname);
		 
		 this.add(panelschool);
		 this.add(paneldate);
		 this.add(panelbutton);
		 this.setSize(350, 300);
		 this.setLocation(300, 150);
		 this.setVisible(true);

		 setDefaultCloseOperation(EXIT_ON_CLOSE);
	 } 
}

public class Delete extends JFrame{
	JFrame f=new JFrame();
	private String driver;
	private String url;
	private String user;
	private String pass;
	JLabel jlnumber = new JLabel("学号：");
    
    JTextField jtnumber = new JTextField("",20);
     
    JButton buttondelete = new JButton("删除");
    JButton buttonreturn = new JButton("返回");
    public Delete() {
    	 JPanel jpnumber = new JPanel();
         JPanel jpforbutton = new JPanel(new GridLayout(1,1));
          
         jpnumber.add(jlnumber);
         jpnumber.add(jtnumber);
          
         jpforbutton.add(buttondelete);
         jpforbutton.add(buttonreturn);
         buttondelete.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				String number= jtnumber.getText();
				Connection conn=null;
				Resultset res=null;
				Statement stat=null;
				String sql="delete from sd where id='"+number+"'";
				
					Properties props=new Properties();
					try {
						props.load(new FileInputStream("src\\jdbc.properties"));
					 
					driver = props.getProperty("driver");// 获取数据库驱动
					url = props.getProperty("url");// 获取想要操作的数据库及其信息
					user = props.getProperty("user");// 获取用户名
					pass = props.getProperty("password");
					conn=DriverManager.getConnection(url, user, pass);
					stat=conn.createStatement();
					stat.executeUpdate(sql);
				}
				catch(SQLException e1) {
					e1.printStackTrace();
				}
				catch(EOFException e2) {
					e2.printStackTrace();
				}
				catch(FileNotFoundException e3) {
					e3.printStackTrace();
				} catch (IOException e4) {
					// TODO Auto-generated catch block
					e4.printStackTrace();
				}
			}
		});
         
         buttonreturn.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
            	 f.dispose();//销毁当前窗口
         }});
         f.setTitle("删除学生信息");
         f.setLayout(new GridLayout(9,1));
         f.add(jpnumber);
         f.add(jpforbutton);
        f.setLocation(400,300);
         f.setSize(350,300);
         f.setVisible(true);
    }
    
}

public class Change extends JFrame{
	private JLabel id,name,school,date;
	 private JTextField fieldid,fieldname,fieldschool,fielddate;
	 private JButton button1, button2;
	 private JPanel panelid,panelbutton,panelname,panelschool,paneldate;
	 private String driver;
		private String url;
		private String user;
		private String pass;
	 void view() {
		id=new JLabel("学号");
		 name=new JLabel("姓名");
		 school=new JLabel("学院");
		 date=new JLabel("入学日期");
		 button1=new JButton("修改");
		 button2=new JButton("返回");
		 fieldid=new JTextField("",20);
		 fielddate=new JTextField("",20);
		 fieldname=new JTextField("",20);
		 fieldschool=new JTextField("",20);
		 panelbutton=new JPanel(new GridLayout(1,1));
		 
		 panelid=new JPanel();
		 panelname=new JPanel();
		 panelschool=new JPanel();
		 paneldate=new JPanel();
		 panelbutton.add(button1);
		 panelbutton.add(button2);
		
		 panelid.add(id);
		 panelid.add(fieldid);
		 panelname.add(name);
		 panelname.add(fieldname);
		 panelschool.add(school);
		 panelschool.add(fieldschool);
		 paneldate.add(date);
		 paneldate.add(fielddate);
		 
		 button1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				
				String sid =fieldid.getText();
				String sname=fieldname.getText();
				String sschool=fieldschool.getText();
				String sdate=fielddate.getText();
				
				Connection conn=null;
				ResultSet res=null;
				Statement stat=null;
				String sql="select id,name,schol,date from sd";
				try {
				Properties props=new Properties();
				props.load(new FileInputStream("src\\jdbc.properties"));
				driver=props.getProperty("driver");
				url=props.getProperty("url");
				user=props.getProperty("user");
				pass=props.getProperty("password");
				Class.forName(driver);
				conn=DriverManager.getConnection(url, user, pass);
				stat=conn.createStatement();
				res=stat.executeQuery(sql);
				while(res.next()) {
					if(res.getString(1).equals(fieldid.getText())) {
						try {
							Class.forName(driver);
						}
						catch(Exception d) {
							System.out.println("jdbc fall");
							d.printStackTrace();
						}
						String sql1="update sd set name='"+sname
								+"' where id='"+fieldid.getText()+"'";
						String sql2="update sd set schol='"+sschool
								+"' where id='"+fieldid.getText()+"'";
						String sql3="update sd set date='"+sdate
								+"' where id='"+fieldid.getText()+"'";
						try {
							conn=DriverManager.getConnection(url, user, pass);
							stat=conn.createStatement();
							stat.executeUpdate(sql1);
							stat.executeUpdate(sql2);
							stat.executeUpdate(sql3);
						}
						catch(SQLException g) {
							System.out.println("数据库更新失败");
							g.printStackTrace();
						}finally {
							stat.close();
							conn.close();
						}
					}
				}
				}catch(Exception e1) {
					e1.printStackTrace();
				}
				finally {
					try {
						conn.close();
					}catch(SQLException ar) {
						ar.printStackTrace();
					}
				}
			}
		});
		 button2.addActionListener(new ActionListener(){
	            public void actionPerformed(ActionEvent e){
	                      Menu menu=new Menu();    
	            }          
	        });
		 this.setTitle("修改学生信息");
		 this.setLayout(new GridLayout(9,1));
		 this.add(panelid);
		 this.add(panelname);
		 this.add(panelschool);
		 this.add(paneldate);
		 this.add(panelbutton);
		 this.setLocation(400,300);
	        this.setSize(350,300);
	        this.setVisible(true);
	        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
	}
}

 

public class Ask extends JFrame{
	JLabel jlnumber = new JLabel("学号：");
    JLabel jlname = new JLabel("姓名：");
    JLabel jlbirthday = new JLabel("入学日期：");
    JLabel jldepartment = new JLabel("学院：");
     
    JTextField jtnumber = new JTextField("",20);
    JTextField jname = new JTextField("",20);
    JTextField jbirthday =new JTextField("",20);
    JTextField jdepartment =new JTextField("",20);
     
    JButton buttonask = new JButton("查询");
    JButton buttonreturn = new JButton("返回");
     
     
    public Ask() {
        JPanel jpnumber = new JPanel();
        JPanel jpname = new JPanel();
       
        JPanel jpbirthday = new JPanel();
        JPanel jpdepartment = new JPanel();
        JPanel jpforbutton = new JPanel(new GridLayout(1,1));
         
        jpnumber.add(jlnumber);
        jpnumber.add(jtnumber);
         
        jpname.add(jlname);
        jpname.add(jname);
        
        jpdepartment.add(jldepartment);
        jpdepartment.add(jdepartment);
         
        jpbirthday.add(jlbirthday);
        jpbirthday.add(jbirthday);
         
      
        jpforbutton.add(buttonask);
        jpforbutton.add(buttonreturn);
         
        buttonask.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                Connection conn = null;
                ResultSet res = null;
                Statement stat = null;
                 
                String sql = "SELECT id,name,schol,date from sd;";
                try{
                    Class.forName("com.mysql.cj.jdbc.Driver");
                     
                }catch(Exception d){
                    System.out.println("jdbc fall");
                    d.printStackTrace();
                }
                try{
                    conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8&serverTimezone=GMT","root","980204");
                    stat=conn.createStatement();
                    res=stat.executeQuery(sql);
                    while (res.next())
                    {
                        if (res.getString(1).equals(jtnumber.getText()))
                        {
                            jname.setText(res.getString(2));
                           
                            jdepartment.setText(res.getString(3));
                            jbirthday.setText(res.getString(4));
 
                            break;
                        }
                    }
                }catch (SQLException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                 
                 
            }
                finally{
                    try{
                        conn.close();
                    }catch(SQLException ar){
                        ar.printStackTrace();
                    }
             
                }}}
             
                );
         
        buttonreturn.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                     new Menu();
            }          
        });
         
         
        this.setTitle("查询学生信息");
        this.setLayout(new GridLayout(9,1));
        this.add(jpnumber);
        this.add(jpname);
     
        this.add(jpbirthday);
        this.add(jpdepartment);
        this.add(jpforbutton);
        this.setLocation(400,300);
        this.setSize(350,300);
        this.setVisible(true);
         

    }
    
}

 

public class Look extends JFrame{
	private JTextField textField;	
	private JButton button;	
	private JScrollPane jscrollpane;	
	private JPanel panel;	
	private JTable jtable;	
	Vector columnNames = null;    
	Vector rowData = null;	
	private String driver;
	private String url;
	private String user;
	private String pass;
	public void view(){		
		textField=new JTextField(20);		
		button=new JButton("关闭");		
		Connection conn=null;		
		PreparedStatement ps=null;		
		ResultSet res=null;		
		columnNames=new Vector();		
		columnNames.add("学号");		
		columnNames.add("姓名");		
		columnNames.add("学院");		
		columnNames.add("入学日期");		
		rowData =new Vector<>();		
		jtable=new JTable(rowData,columnNames);		
		jscrollpane =new JScrollPane(jtable);		
		try{
			Properties prop=new Properties();
			prop.load(new FileInputStream("src\\jdbc.properties"));
			driver=prop.getProperty("driver");
			url=prop.getProperty("url");
			user=prop.getProperty("user");
			pass=prop.getProperty("password");
			
		}
		catch(IOException e1){
			e1.printStackTrace();
		}
		try {
			Class.forName(driver);
			conn=DriverManager.getConnection(url, user, pass);
			ps=conn.prepareStatement("select * from sd");
			res=ps.executeQuery();
		
			while (res.next())
	        {
	            Vector hang = new Vector();
	            hang.add(res.getString(1));
	            hang.add(res.getString(2));
	            hang.add(res.getString(3));
	            hang.add(res.getString(4));
	          
	            rowData.add(hang);
	        }
			
		}catch(SQLException e2) {
			e2.printStackTrace();
		}catch(Exception e3) {
			e3.printStackTrace();
		}finally{
            try{
                res.close();
                ps.close();
                conn.close();
                System.out.println("close ok");
            }catch (SQLException o){
                o.printStackTrace();
                System.out.println("go die 2");
            }}
		button.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				
				
			}
		});
		jtable = new JTable(rowData,columnNames);
	    jscrollpane = new JScrollPane(jtable);
	     
	    this.add(jscrollpane);
	    this.setTitle("浏览学生信息");
	    this.setLayout(new GridLayout(2,5));
	   // this.add(button);
	    
	    this.setLocation(300,300);
	    this.setSize(500,300);
	    this.setVisible(true);
	    this.setResizable(false);
		
}

}