使用eclipse设计学生管理系统

                              使用eclipse设计学生管理系统

1.下载安装eclipse，建立一个java工程（File>>New>>Java Project>>Project Name: StudentManager）

2.在src中建立一个view包，来保存视图工程（src右击>>New>>Package>>Name:view）

3.使用可视化设计器和布局工具来创建简单的Windows窗体进行登录页面设计，右击view>>New>>Other>>WindowBuilder>>Swing Design>>JFrame,Next>>Name:loginframe

4.可视化设计登录页面：

1）点击design进入可视化编辑页面：

（关于在eclipse中中文汉字乱码的解决方式   明礼馨德 博客）

2）在Class javax.swing.JFrame 的title中输入该界面名称：学生管理系统

3) 在contentPane>>Layout>>选择GroupLaout，如此我们可以自由进行布局

4）我们需要一个标题，在components中选择JLable来添加一个文本框，在text一栏中输入显示的文本：学生管理系统重复

5)重复上述步骤，我们还需建立三个文本框，分别重命名为：lable lable_1 lable_2内容分别为:  用户名： 密码： 用户类型： ，此时我们会发现一个问题，由于文本的长度不同，所以他们是没有对齐的，非常不美观，所以我们要对他们进行处理，首先我们想到的方法是直接在文本内容中加空格，但是这中方法添加空格非常不稳定，细微上不容易对齐，其次我们会想到回到Source界面，使用十六进制输入汉字，然后在其中添加空格，相对容易但比较麻烦，我们这里采用第三种方法，右对齐，即使签中的文字在标签里面右对齐，JLabel a=new JLabel("用户名"，JLabel.RIGHT)然后使用适当的空格进行填充。GBK中一个汉字占2个字节 空格占1个字节 ；UTF-8中一个汉字占3个字节一个空格占1个字节

6）添加两个文本输入框

    在components中选择JTextField，调整合适的大小,建立两个文本输入框，分别重命名为：usernametextField passwordtextField

7）添加组合框

    在components中选择JCombox（组合框 ：显示一个可编辑的文本框和下拉列表，用户可以从下拉列表中选择一个或多个值。用户可以直接输入文本到列表的顶部，或者从列表中选择一个或多个现成的值。）,调整适当大小，重命名为：usertypecomboBox（在这里解释一下重命名的作用，这是为了方便我们后期再Source界面进行调试的时候，方便快捷的知道该模块的代码是那一部分的，防止把用户名的输入框当成密码的输入框这种类似的错误发生），在model中输入系统管理员 换行 教师 换行 学生 换行 三个选择 ，注意在后期我们会建立枚举类来替代这三个选择，此时输入最主要是为了在source界面中产生相应的代码

8）添加两个按钮

    在components中选择JButton，重命名为：loginbutton  resetbutton ， text中分别输入 登录  重置

如此一个简易的登录页面算完成了：

5.设计主页面

过程与设计登录页面过程基本相似

1）新建mainframe，进入design页面

2）调整适合的框图大小

3）添加菜单栏

    在Menu中选择JMenuBar

4)在菜单栏中添加两个菜单

    在JMenuBar中添加两个JMenu，分别重命名为：menu  menu_1，text中分别输入系统设置，班级管理

5)添加菜单项目

    在JMenu中添加JMenuItem，此次我们需要在系统设置里添加两选项：修改密码 退出系统 在班级管理中添加一个选项：添加班级，然后依次进行重命名：menuItem menuItem_1 menuItem_2，然后再text中添加文字描述

6）添加虚拟界面

    在Container中添加JDesktopPane（用于创建多文档界面或虚拟桌面的容器）。为了方便区分，我们给它加上背景颜色

6.设计修改密码页面

1）新建editpasswordframe，进入design页面

new>>others>>JInternalFrame

2）调整适合的框图大小

3）添加五个文本框，分别为：   当前用户：     原密码： 新密码： 确认密码：  空白文本框（在当前用户：后面）分别重命名为：label_3   label    label_1    label_2    currentUserLabel

4）添加三个文本输入框，分别重命名为：oldpwdtextField   newpwdtextField  confirmpwdField按钮

5)添加两个按钮，分别重命名为：submitbutton resetbutton  ，在text中分别输入 确定  重置

到目前为止，三个可视化窗口的设计算是基本完成了

7.将登陆页面窗口置于屏幕中央

    显然，我们每次首先要运行的是登录页面，那么在运行时我们就会发现，点击运行后，该弹窗显示在屏幕左上角，我们为了视觉上的舒适感通常会把它拖到屏幕中央，怎样默认让它显示在屏幕中央呢？

我们只需在loginframe.java的public loginframe() {     （setContentPane(contentPane);下放）   中添加一行代码

setLocationRelativeTo(null);//窗口将置于屏幕的中央

就能实现这个功能了。

（public void setLocationRelativeTo(Component c)  设置窗口相对于指定组件的位置。 如果组件当前未显示或者 c 为 null，则此窗口将置于屏幕的中央。  中点可以使用 GraphicsEnvironment.getCenterPoint 确定    披Zhe羊皮De狼 博客）

8.登录页面功能完善

  登录按钮和重置按钮的实现

    

        JButton loginbutton = new JButton("登录");
		loginbutton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				login();//登录按钮实现的方法，具体实现在下面
			}
		});
		
		JButton resetbutton = new JButton("重置");
		resetbutton.addActionListener(new ActionListener() {//重置按钮的实现
			public void actionPerformed(ActionEvent arg0) {
				usernametextField.setText("");
				passwordtextField.setText("");
				usertypecomboBox.setSelectedIndex(0);
			}
		});

        
        ......


        protected void login() {     //我们把该函数放在整体代码最后来实现整体代码的美观
		String name=usernametextField.getText().toString();
		String password=passwordtextField.getText().toString();
		usertype selectItem=(usertype) usertypecomboBox.getSelectedItem();
		if(stringutil.isEmpty(name)){
			JOptionPane.showMessageDialog(this, "用户名不能为空");	//弹出提示性对话框
			return;
		}
		if(stringutil.isEmpty(password)){
			JOptionPane.showMessageDialog(this, "密码不能为空");	
			return;
		}
		Admin admin=null;
		if("系统管理员".equals(selectItem.getName())){
			Admindao admindao=new Admindao();
			Admin admin2=new Admin();
			admin2.setName(name);
			admin2.setPassword(password);
			admin=admindao.login(admin2);
			if(admin==null){
				JOptionPane.showMessageDialog(this, "用户名或者密码错误");
				return;
			}
			this.dispose();//当前登录界面关闭
		    new mainframe(selectItem,admin).setVisible(true);//主页面显示
			
		}

此时会出现许多小问题，不要慌，我们去逐个破解，首先是

usertype selectItem=(usertype) usertypecomboBox.getSelectedItem();

这是因为我们把 usertypecomboBox定义在了public loginframe()中，而在protected void login()不包含它的定义所导致的，因此我们只需要把它定义在最外层public class loginframe extends JFrame  中就可以了，同时记得修改public loginframe()中的定义，避免重复定义。

public class loginframe extends JFrame {

	private JPanel contentPane;
	private JTextField usernametextField;
	private JTextField passwordtextField;
	private JComboBox usertypecomboBox ;    //

    ...

        public loginframe() {

        ...

        	    usertypecomboBox = new JComboBox();
		usertypecomboBox.setModel(new DefaultComboBoxModel(new String[] {"系统管理员", "教师", "学生"}));
		


     

接下来的问题也主要是元素没有定义，这是因为本人发布为最终代码，其中部分优化加入了其他的包和元素定义，在这里我带领大家一一加入。

 1）在原有view包的基础上建立四个包分别为  dao（存储于数据库有关的代码） images（存放图片） model（存放枚举类等）util（存放连接和判断条件）

2）在model中新建枚举类usertype    （如何自动生成代码模板问题）

model>>new>>Enum

package model;

public enum usertype {
	ADMIN("系统管理员",0),TEACHER("教师",1),STUDENT("学生",2);
	private String name;
	private int index;
	private usertype(String name,int index){
		this.name = name;
		this.index = index;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getIndex() {
		return index;
	}
	public void setIndex(int index) {
		this.index = index;
	}
	@Override
	public String toString(){
		return this.name;
	}

}

在loginframe中引入枚举类

 usertypecomboBox.setModel(new DefaultComboBoxModel(new usertype[] {usertype.ADMIN, usertype.TEACHER, usertype.STUDENT}));//用户类型的值为枚举类中设定的

3）在util中生成stringutil    

util>>new>>class

package util;
/*
 * 判断字符串是否为空
 */
public class stringutil {
	public static boolean isEmpty(String str){
		if("".equals(str)|| str == null){
			return true;
		}
		return false;
	}
}

4)在model中新建Admin 类

model>>new>>class

package model;

public class Admin {
    private int id;
    private String name;
    private String password;
    private String createdate;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getCreatedate() {
		return createdate;
	}
	public void setCreatedate(String createdate) {
		this.createdate = createdate;
	}
    
}

5)在dao中新建Admindao

dao>>new>>class

package dao;

import java.sql.SQLException;

import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.ResultSet;

import model.Admin;

public class Admindao extends Basedao {
     /*管理员登录，查询用户名和密码，是否和数据库中的匹配
      * 
      */
	public Admin login(Admin admin) {
		String sql="select * from admin where name=? and password=?";
		Admin admin2=null;
		try {
			PreparedStatement preparedStatement=(PreparedStatement) con.prepareStatement(sql);
			preparedStatement.setString(1, admin.getName());
			preparedStatement.setString(2, admin.getPassword());
			ResultSet resultSet=(ResultSet) preparedStatement.executeQuery();
			if(resultSet.next()){
				 admin2=new Admin();
				 admin2.setId(resultSet.getInt("id"));
				 admin2.setName(resultSet.getString("name"));
				 admin2.setPassword(resultSet.getString("password"));
				 admin2.setCreatedate(resultSet.getString("createdate")); 
			}
			
		} catch (SQLException e) {
			// TODO: handle exception
		}
		
		return admin2;
		
	}
	/*
	 * 修改密码，先查询旧密码，再更新新密码
	 */
	public String editPassword(Admin admin,String newPassword){
		String sql = "select * from admin where id=? and password=?";
		PreparedStatement prst = null;
		int id = 0;
		try {
			prst = (PreparedStatement) con.prepareStatement(sql);
			prst.setInt(1, admin.getId());
			prst.setString(2, admin.getPassword());
			ResultSet executeQuery = (ResultSet) prst.executeQuery();
			if(!executeQuery.next()){
				String retString = "旧密码错误！";
				return retString;
			}
			id = executeQuery.getInt("id");
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		String retString = "修改失败";
		String sqlString = "update admin set password = ? where id = ?";
		try {
			prst = (PreparedStatement) con.prepareStatement(sqlString);
			prst.setString(1, newPassword);
			prst.setInt(2, id);
			int rst = prst.executeUpdate();
			if(rst > 0){
				retString = "密码修改成功！";
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return retString;
	}
}

6）导入jar包

mysql-connector-java-5.0.4-bin (附件)

新建lib文件夹，复制粘贴入该jar包，build path  >>ALL

7)在dao包中新建Basedao

dao>>new>>Basedao

package dao;

import java.sql.Connection;
import java.sql.SQLException;

import util.Dbutil;

public class Basedao {
//创建数据库连接对象
	public Connection con=new Dbutil().getCon();
	public void closeDao() {
		try {
			con.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
}

8)在util中新建DButil

util>>new>>DButil

package util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class Dbutil {
	private String dbUrl="jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf8"; // 数据库连接地址
	private String dbUserName="root"; // 用户名  此处用户名和密码均为举例，需要实际输入你电脑 
                                      // 上的数据库名和密码等
	private String dbPassword="root"; // 密码
	private String jdbcName="com.mysql.jdbc.Driver"; // 驱动名称
	/**
	 * 获取数据库连接
	 * @return
	 * @throws Exception
	 */
	public Connection getCon(){
		try {
			Class.forName(jdbcName);
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		Connection con = null;
		try {
			con = DriverManager.getConnection(dbUrl, dbUserName, dbPassword);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return con;
	}
	/**
	 * 关闭数据库连接
	 * @param con
	 * @throws Exception
	 */
	public void closeCon(Connection con)throws Exception{
		if(con!=null){
			con.close();
		}
	}
	
	public static void main(String[] args) {
		Dbutil dbUtil=new Dbutil();
		try {
			dbUtil.getCon();
			System.out.println("数据库连接成功！");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("数据库连接失败");
		}
	}
}

9.完善mainframe.java

1)定义元素

public class mainframe extends JFrame {

	private JPanel contentPane;
	public static usertype usertype;
	public static Object userobject;
	private JDesktopPane desktopPane;
...

2）注销原有的样式

//	public static void main(String[] args) {
//		EventQueue.invokeLater(new Runnable() {
//			public void run() {
//				try {
//					mainframe frame = new mainframe();
//					frame.setVisible(true);
//				} catch (Exception e) {
//					e.printStackTrace();
//				}
//			}
//		});
//	}

3）

public mainframe(usertype usertype,Object userObject) {
		this.usertype=usertype;
		this.userobject=userObject;
		...
		setLocationRelativeTo(null);
....

4）给修改密码添加一个监听事件

menuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				editpassword(ae);
			}
		});

5）给退出系统添加一个监听事件

menuItem_1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				if(JOptionPane.showConfirmDialog(mainframe.this, "确定要退出吗？")==JOptionPane.OK_OPTION){
					System.exit(0);
				}
			}
		});

6）给添加班级添加一个监听事件

menuItem_2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
//				//addclassframe addclassframe=new addclassframe();
//				addclassframe.setVisible(true);
//				desktopPane.add(addclassframe);
			}
		});

7）定义 editpassword

protected void editpassword(ActionEvent ae) {
		// TODO Auto-generated method stub
		editpasswordframe editpasswordframe = new editpasswordframe();
		editpasswordframe.setVisible(true);
		desktopPane.add(editpasswordframe);
	}

10.完善editpassword.java

1)定义lable

public class editpasswordframe extends JFrame {

	private JPanel contentPane;
	private JTextField oldpwdtextField;
	private JTextField newpwdtextField;
	private JTextField confirmpwdField;
	private JLabel label_1;
	private JLabel label_2;
	private JLabel currentUserLabel;

2）同样注销原有界面

//	public static void main(String[] args) {
//		EventQueue.invokeLater(new Runnable() {
//			public void run() {
//				try {
//					editpasswordframe frame = new editpasswordframe();
//					frame.setVisible(true);
//				} catch (Exception e) {
//					e.printStackTrace();
//				}
//			}
//		});
//	}

3）设置窗口关闭，设置最小化窗口

        setClosable(true);//设置窗口关闭
		setIconifiable(true);//设置最小化的窗口

4）为确认按钮添加监听事件

submitbutton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				submit(e);//确认按钮的监听实现方法，具体实现在下面
			}
		});

5）为重置按钮添加监听事件

resetbutton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				resetvalue(ae);//重置按钮的监听实现方法，具体实现在下面
			}
		});

6）获取当前用户名

        /*
		 * 获取当前登录的用户名字
		 */
		if("系统管理员".equals(mainframe.usertype.getName())){
			Admin admin=(Admin) mainframe.userobject;
			currentUserLabel.setText("【系统管理员】"+admin.getName());
		}
	}

7）定义确定事件和重置事件

protected void submit(ActionEvent e) {
		// TODO Auto-generated method stub
		String oldpwd=oldpwdtextField.getText().toString();
		String newpwd=newpwdtextField.getText().toString();
		String confirmpwd=confirmpwdtextField.getText().toString();
		if(stringutil.isEmpty(oldpwd)){
			JOptionPane.showMessageDialog(this, "旧密码不能为空");
			return;
		}
		if(stringutil.isEmpty(newpwd)){
			JOptionPane.showMessageDialog(this, "新密码不能为空");
			return;
		}
		if(stringutil.isEmpty(confirmpwd)){
			JOptionPane.showMessageDialog(this, "确认密码不能为空");
			return;
		}
		if(!newpwd.equals(confirmpwd)){
			JOptionPane.showMessageDialog(this, "两次密码输入不一致");
			return;
		}
		if("系统管理员".equals(mainframe.usertype.getName())){
			Admindao adminDao = new Admindao();
			Admin adminTmp = new Admin();
			Admin admin = (Admin)mainframe.userobject;
			adminTmp.setName(admin.getName());
			adminTmp.setId(admin.getId());
			adminTmp.setPassword(oldpwd);
			JOptionPane.showMessageDialog(this, adminDao.editPassword(adminTmp,newpwd));
			adminDao.closeDao();
			return;
		}
	}

	protected void resetvalue(ActionEvent ae) {
		// TODO Auto-generated method stub
		oldpwdtextField.setText("");
		newpwdtextField.setText("");
		confirmpwdField.setText("");
	}

---

全部代码：

package dao;

import java.sql.SQLException;

import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.ResultSet;

import model.Admin;

public class Admindao extends Basedao {
     /*管理员登录，查询用户名和密码，是否和数据库中的匹配
      * 
      */
	public Admin login(Admin admin) {
		String sql="select * from admin where name=? and password=?";
		Admin admin2=null;
		try {
			PreparedStatement preparedStatement=(PreparedStatement) con.prepareStatement(sql);
			preparedStatement.setString(1, admin.getName());
			preparedStatement.setString(2, admin.getPassword());
			ResultSet resultSet=(ResultSet) preparedStatement.executeQuery();
			if(resultSet.next()){
				 admin2=new Admin();
				 admin2.setId(resultSet.getInt("id"));
				 admin2.setName(resultSet.getString("name"));
				 admin2.setPassword(resultSet.getString("password"));
				 admin2.setCreatedate(resultSet.getString("createdate")); 
			}
			
		} catch (SQLException e) {
			// TODO: handle exception
		}
		
		return admin2;
		
	}
	/*
	 * 修改密码，先查询旧密码，再更新新密码
	 */
	public String editPassword(Admin admin,String newPassword){
		String sql = "select * from admin where id=? and password=?";
		PreparedStatement prst = null;
		int id = 0;
		try {
			prst = (PreparedStatement) con.prepareStatement(sql);
			prst.setInt(1, admin.getId());
			prst.setString(2, admin.getPassword());
			ResultSet executeQuery = (ResultSet) prst.executeQuery();
			if(!executeQuery.next()){
				String retString = "旧密码错误！";
				return retString;
			}
			id = executeQuery.getInt("id");
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		String retString = "修改失败";
		String sqlString = "update admin set password = ? where id = ?";
		try {
			prst = (PreparedStatement) con.prepareStatement(sqlString);
			prst.setString(1, newPassword);
			prst.setInt(2, id);
			int rst = prst.executeUpdate();
			if(rst > 0){
				retString = "密码修改成功！";
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return retString;
	}
}

package dao;

import java.sql.Connection;
import java.sql.SQLException;

import util.Dbutil;

public class Basedao {
//创建数据库连接对象
	public Connection con=new Dbutil().getCon();
	public void closeDao() {
		try {
			con.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
}

package model;

public class Admin {
    private int id;
    private String name;
    private String password;
    private String createdate;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getCreatedate() {
		return createdate;
	}
	public void setCreatedate(String createdate) {
		this.createdate = createdate;
	}
    
}

package model;

public enum usertype {
	ADMIN("系统管理员",0),TEACHER("教师",1),STUDENT("学生",2);
	private String name;
	private int index;
	private usertype(String name,int index){
		this.name = name;
		this.index = index;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getIndex() {
		return index;
	}
	public void setIndex(int index) {
		this.index = index;
	}
	@Override
	public String toString(){
		return this.name;
	}

}

package util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class Dbutil {
	private String dbUrl="jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf8"; // 数据库连接地址
	private String dbUserName="root"; // 用户名
	private String dbPassword="root"; // 密码
	private String jdbcName="com.mysql.jdbc.Driver"; // 驱动名称
	/**
	 * 获取数据库连接
	 * @return
	 * @throws Exception
	 */
	public Connection getCon(){
		try {
			Class.forName(jdbcName);
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		Connection con = null;
		try {
			con = DriverManager.getConnection(dbUrl, dbUserName, dbPassword);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return con;
	}
	/**
	 * 关闭数据库连接
	 * @param con
	 * @throws Exception
	 */
	public void closeCon(Connection con)throws Exception{
		if(con!=null){
			con.close();
		}
	}
	
	public static void main(String[] args) {
		Dbutil dbUtil=new Dbutil();
		try {
			dbUtil.getCon();
			System.out.println("数据库连接成功！");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("数据库连接失败");
		}
	}
}

package util;
/*
 * 判断字符串是否为空
 */
public class stringutil {
	public static boolean isEmpty(String str){
		if("".equals(str)|| str == null){
			return true;
		}
		return false;
	}
}

package view;

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.GroupLayout.Alignment;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.border.EmptyBorder;

import dao.Admindao;
import model.Admin;
import util.stringutil;

public class editpasswordframe extends JInternalFrame {

	private JPanel contentPane;
	private JLabel label_1;
	private JLabel currentUserLabel;
	private JTextField newpwdtextField;
	private JLabel label_2;
	private JTextField confirmpwdtextField;
	private JTextField oldpwdtextField;

	/**
	 * Launch the application.
	 */
//	public static void main(String[] args) {
//		EventQueue.invokeLater(new Runnable() {
//			public void run() {
//				try {
//					editpasswordframe frame = new editpasswordframe();
//					frame.setVisible(true);
//				} catch (Exception e) {
//					e.printStackTrace();
//				}
//			}
//		});
//	}

	/**
	 * Create the frame.
	 */
	public editpasswordframe() {
		setTitle("\u7BA1\u7406\u5458\u4FEE\u6539\u5BC6\u7801");
		//setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 626, 500);
		setClosable(true);//设置窗口关闭
		setIconifiable(true);//设置最小化的窗口
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		
		JLabel label = new JLabel("\u539F\u5BC6\u7801\uFF1A");
		label.setFont(new Font("宋体", Font.PLAIN, 25));
		
		label_1 = new JLabel("\u65B0\u5BC6\u7801\uFF1A");
		label_1.setFont(new Font("宋体", Font.PLAIN, 25));
		
		newpwdtextField = new JTextField();
		newpwdtextField.setColumns(10);
		
		label_2 = new JLabel("\u786E\u8BA4\u5BC6\u7801\uFF1A");
		label_2.setFont(new Font("宋体", Font.PLAIN, 25));
		
		confirmpwdtextField = new JTextField();
		confirmpwdtextField.setColumns(10);
		
		oldpwdtextField = new JTextField();
		oldpwdtextField.setColumns(10);
		
		JButton submitbutton = new JButton("\u786E\u8BA4");
		submitbutton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				submit(e);//确认按钮的监听实现方法，具体实现在下面
			}
		});
		submitbutton.setFont(new Font("宋体", Font.PLAIN, 24));
		
		JButton resetbutton = new JButton("\u91CD\u7F6E");
		resetbutton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				resetvalue(ae);//重置按钮的监听实现方法，具体实现在下面
			}
		});
		resetbutton.setFont(new Font("宋体", Font.PLAIN, 24));
		
		JLabel label_3 = new JLabel("\u5F53\u524D\u7528\u6237\uFF1A");
		label_3.setFont(new Font("宋体", Font.PLAIN, 25));
		
	    currentUserLabel = new JLabel("");
		//currentUserLabel.setEnabled(false);
		GroupLayout gl_contentPane = new GroupLayout(contentPane);
		gl_contentPane.setHorizontalGroup(
			gl_contentPane.createParallelGroup(Alignment.TRAILING)
				.addGroup(gl_contentPane.createSequentialGroup()
					.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
						.addGroup(gl_contentPane.createSequentialGroup()
							.addContainerGap()
							.addComponent(submitbutton)
							.addGap(83)
							.addComponent(resetbutton)
							.addGap(36))
						.addGroup(gl_contentPane.createSequentialGroup()
							.addGap(109)
							.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
								.addComponent(label_1)
								.addComponent(label)
								.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING, false)
									.addComponent(label_3, Alignment.LEADING, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
									.addComponent(label_2, Alignment.LEADING, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
							.addGap(13)
							.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
								.addGroup(gl_contentPane.createSequentialGroup()
									.addGap(1)
									.addComponent(confirmpwdtextField, GroupLayout.PREFERRED_SIZE, 198, GroupLayout.PREFERRED_SIZE))
								.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
									.addComponent(newpwdtextField, GroupLayout.DEFAULT_SIZE, 199, Short.MAX_VALUE)
									.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
										.addComponent(currentUserLabel, Alignment.LEADING, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
										.addComponent(oldpwdtextField, Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 198, GroupLayout.PREFERRED_SIZE))))))
					.addContainerGap(152, GroupLayout.PREFERRED_SIZE))
		);
		gl_contentPane.setVerticalGroup(
			gl_contentPane.createParallelGroup(Alignment.LEADING)
				.addGroup(gl_contentPane.createSequentialGroup()
					.addGap(37)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(label_3, GroupLayout.PREFERRED_SIZE, 30, GroupLayout.PREFERRED_SIZE)
						.addComponent(currentUserLabel, GroupLayout.PREFERRED_SIZE, 28, GroupLayout.PREFERRED_SIZE))
					.addGap(34)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
						.addComponent(label)
						.addComponent(oldpwdtextField, GroupLayout.PREFERRED_SIZE, 35, GroupLayout.PREFERRED_SIZE))
					.addGap(47)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(label_1)
						.addComponent(newpwdtextField, GroupLayout.PREFERRED_SIZE, 35, GroupLayout.PREFERRED_SIZE))
					.addGap(52)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
						.addComponent(label_2)
						.addComponent(confirmpwdtextField, GroupLayout.PREFERRED_SIZE, 35, GroupLayout.PREFERRED_SIZE))
					.addPreferredGap(ComponentPlacement.RELATED, 65, Short.MAX_VALUE)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(submitbutton, GroupLayout.PREFERRED_SIZE, 37, GroupLayout.PREFERRED_SIZE)
						.addComponent(resetbutton))
					.addGap(34))
		);
		contentPane.setLayout(gl_contentPane);
		/*
		 * 获取当前登录的用户名字
		 */
		if("系统管理员".equals(mainframe.usertype.getName())){
			Admin admin=(Admin) mainframe.userobject;
			currentUserLabel.setText("【系统管理员】"+admin.getName());
		}
	}

	protected void submit(ActionEvent e) {
		// TODO Auto-generated method stub
		String oldpwd=oldpwdtextField.getText().toString();
		String newpwd=newpwdtextField.getText().toString();
		String confirmpwd=confirmpwdtextField.getText().toString();
		if(stringutil.isEmpty(oldpwd)){
			JOptionPane.showMessageDialog(this, "旧密码不能为空");
			return;
		}
		if(stringutil.isEmpty(newpwd)){
			JOptionPane.showMessageDialog(this, "新密码不能为空");
			return;
		}
		if(stringutil.isEmpty(confirmpwd)){
			JOptionPane.showMessageDialog(this, "确认密码不能为空");
			return;
		}
		if(!newpwd.equals(confirmpwd)){
			JOptionPane.showMessageDialog(this, "两次密码输入不一致");
			return;
		}
		if("系统管理员".equals(mainframe.usertype.getName())){
			Admindao adminDao = new Admindao();
			Admin adminTmp = new Admin();
			Admin admin = (Admin)mainframe.userobject;
			adminTmp.setName(admin.getName());
			adminTmp.setId(admin.getId());
			adminTmp.setPassword(oldpwd);
			JOptionPane.showMessageDialog(this, adminDao.editPassword(adminTmp,newpwd));
			adminDao.closeDao();
			return;
		}
	}

	protected void resetvalue(ActionEvent ae) {
		// TODO Auto-generated method stub
		oldpwdtextField.setText("");
		newpwdtextField.setText("");
		confirmpwdtextField.setText("");
	}
}

package view;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import dao.Admindao;
import model.Admin;
import model.usertype;
import util.stringutil;

import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

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

import javax.swing.SwingConstants;
import javax.swing.JTextField;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.LayoutStyle.ComponentPlacement;

public class loginframe extends JFrame {

	private JPanel contentPane;
	private JTextField usernametextField;
	private JTextField passwordtextField;
	private JComboBox usertypecomboBox ;
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					loginframe frame = new loginframe();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public loginframe() {
		setTitle("学生管理系统");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 587, 453);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		setLocationRelativeTo(null);//窗口将置于屏幕的中央
		
		JLabel lblNewLabel = new JLabel("学生管理系统");
		lblNewLabel.setFont(new Font("华文楷体", Font.PLAIN, 25));
		
		JLabel label = new JLabel("用 户 名：",JLabel.RIGHT);
		
		JLabel lable_1 = new JLabel("密    码：",JLabel.RIGHT);
		
		JLabel lable_2 = new JLabel("用户类型：",JLabel.RIGHT);
		
		usernametextField = new JTextField();
		usernametextField.setColumns(10);
		
		passwordtextField = new JTextField();
		passwordtextField.setColumns(10);
		
	    usertypecomboBox = new JComboBox();
	    usertypecomboBox.setModel(new DefaultComboBoxModel(new usertype[] {usertype.ADMIN, usertype.TEACHER, usertype.STUDENT}));//用户类型的值为枚举类中设定的
		
		JButton loginbutton = new JButton("登录");
		loginbutton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				login();//登录按钮实现的方法，具体实现在下面
			}
		});
		
		JButton resetbutton = new JButton("重置");
		resetbutton.addActionListener(new ActionListener() {//重置按钮的实现
			public void actionPerformed(ActionEvent arg0) {
				usernametextField.setText("");
				passwordtextField.setText("");
				usertypecomboBox.setSelectedIndex(0);
			}
		});
		GroupLayout gl_contentPane = new GroupLayout(contentPane);
		gl_contentPane.setHorizontalGroup(
			gl_contentPane.createParallelGroup(Alignment.LEADING)
				.addGroup(gl_contentPane.createSequentialGroup()
					.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
						.addGroup(gl_contentPane.createSequentialGroup()
							.addGap(210)
							.addComponent(lblNewLabel))
						.addGroup(gl_contentPane.createSequentialGroup()
							.addGap(85)
							.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)
								.addComponent(lable_2, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
								.addComponent(lable_1, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
								.addComponent(label, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
							.addGap(18)
							.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)
								.addComponent(usertypecomboBox, 0, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
								.addComponent(usernametextField)
								.addComponent(passwordtextField, GroupLayout.DEFAULT_SIZE, 226, Short.MAX_VALUE))))
					.addContainerGap(153, Short.MAX_VALUE))
				.addGroup(Alignment.TRAILING, gl_contentPane.createSequentialGroup()
					.addGap(195)
					.addComponent(loginbutton, 0, 0, Short.MAX_VALUE)
					.addGap(49)
					.addComponent(resetbutton, GroupLayout.PREFERRED_SIZE, 66, GroupLayout.PREFERRED_SIZE)
					.addGap(183))
		);
		gl_contentPane.setVerticalGroup(
			gl_contentPane.createParallelGroup(Alignment.LEADING)
				.addGroup(gl_contentPane.createSequentialGroup()
					.addGap(30)
					.addComponent(lblNewLabel)
					.addGap(43)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(label)
						.addComponent(usernametextField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
					.addGap(35)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(lable_1)
						.addComponent(passwordtextField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
					.addGap(58)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(lable_2)
						.addComponent(usertypecomboBox, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
					.addGap(37)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(loginbutton)
						.addComponent(resetbutton))
					.addGap(15))
		);
		contentPane.setLayout(gl_contentPane);
	}		
		protected void login() {
			String name=usernametextField.getText().toString();
			String password=passwordtextField.getText().toString();
			usertype selectItem=(usertype) usertypecomboBox.getSelectedItem();
			if(stringutil.isEmpty(name)){
				JOptionPane.showMessageDialog(this, "用户名不能为空");	//弹出提示性对话框
				return;
			}
			if(stringutil.isEmpty(password)){
				JOptionPane.showMessageDialog(this, "密码不能为空");	
				return;
			}
			Admin admin=null;
			if("系统管理员".equals(selectItem.getName())){
				Admindao admindao=new Admindao();
				Admin admin2=new Admin();
				admin2.setName(name);
				admin2.setPassword(password);
				admin=admindao.login(admin2);
				if(admin==null){
					JOptionPane.showMessageDialog(this, "用户名或者密码错误");
					return;
				}
				this.dispose();//当前登录界面关闭
			    new mainframe(selectItem,admin).setVisible(true);//主页面显示
				
			}
	}
}

package view;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import model.usertype;

import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JDesktopPane;
import java.awt.Color;

public class mainframe extends JFrame {

	private JPanel contentPane;
	public static usertype usertype;
	public static Object userobject;
	private JDesktopPane desktopPane;

	/**
	 * Launch the application.
	 */
//	public static void main(String[] args) {
//		EventQueue.invokeLater(new Runnable() {
//			public void run() {
//				try {
//					mainframe frame = new mainframe();
//					frame.setVisible(true);
//				} catch (Exception e) {
//					e.printStackTrace();
//				}
//			}
//		});
//	}

	/**
	 * Create the frame.
	 */
	public mainframe(usertype usertype,Object userObject) {
		this.usertype=usertype;
		this.userobject=userObject;
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 925, 707);
		setLocationRelativeTo(null);
		
		JMenuBar menuBar = new JMenuBar();
		setJMenuBar(menuBar);
		
		JMenu menu = new JMenu("系统设置");
		menuBar.add(menu);
		
		JMenuItem menuItem = new JMenuItem("修改密码");
		menuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				editpassword(ae);
			}
		});
		menu.add(menuItem);
		
		JMenuItem menuItem_1 = new JMenuItem("退出系统");
		menuItem_1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				if(JOptionPane.showConfirmDialog(mainframe.this, "确定要退出吗？")==JOptionPane.OK_OPTION){
					System.exit(0);
				}
			}
		});
		menu.add(menuItem_1);
		
		JMenu menu_1 = new JMenu("班级管理");
		menuBar.add(menu_1);
		
		JMenuItem menuItem_2 = new JMenuItem("添加班级");
		menuItem_2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
//				//addclassframe addclassframe=new addclassframe();
//				addclassframe.setVisible(true);
//				desktopPane.add(addclassframe);
			}
		});
		menu_1.add(menuItem_2);
		contentPane = new JPanel();
		contentPane.setBackground(new Color(173, 216, 230));
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		contentPane.setLayout(new BorderLayout(0, 0));
		setContentPane(contentPane);
		
		JDesktopPane desktopPane = new JDesktopPane();
		desktopPane.setBackground(Color.CYAN);
		contentPane.add(desktopPane, BorderLayout.NORTH);
	}
	
	protected void editpassword(ActionEvent ae) {
		// TODO Auto-generated method stub
		editpasswordframe editpasswordframe = new editpasswordframe();
		editpasswordframe.setVisible(true);
		desktopPane.add(editpasswordframe);
	}
}