学生成绩管理系统

一个简单的学生成绩管理系统，大概花费了我3天多的时间，从刚开始的设计到最后的实验报告。在完成过程中有以下几个让人头疼的问题：

1、java链接access数据库过程中，sql语句的一些问题。在建数据表的时候一定不要把一些关键字作为表的字段，比如像name、java这样的关键字，这种情况下都会导致sql语句执行失败，而在查找原因的时候又往往找不到关键原因，让人很头疼

2、一些sql语句中，如果有字符串，则必须包含在单引号中，不然会出现错误，而其他类型，则不必

3、java的图形界面的掌握的知识还不够，而且对于java的一些链表还不能熟练使用，以后应该及时把这一部分类容补上

4、对于小项目，没有按照标准的步骤完成，以后一定要学者用软件工程的思想来做项目

现在将改项目的代码粘贴如下：

文件结构：

package manageGUI;

import sql.*;
import user.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import java.sql.*;

public class LoginGUI extends JFrame implements ActionListener,ItemListener {
	/*输入提示标签*/
	JLabel lblName;
	JLabel lblPwd;
	JLabel lblSelect;
	JLabel lblNote;
	
	/*输入文本框*/
	JTextField txtUserName;
	JPasswordField txtUserPwd;
	
	/*操作按钮*/
	JButton jbLogin;
	JRadioButton jrbTeacher;
	JRadioButton jrbStudent;
	JRadioButton jrbManage;
	JRadioButton jrbMainTeacher;
	ButtonGroup jbtType;
	
	DBAccess db=new DBAccess();
	String sql;
	String tempUser,tempPwd;
	String userType="teacher";
	String userNum;
	
	
	public LoginGUI(String s){
		this.setTitle(s);
		
		lblName=new JLabel("用户名");
		lblPwd=new JLabel("密码");
		lblSelect=new JLabel("请选择您的身份");
		lblNote=new JLabel();
		
		txtUserName=new JTextField(15);
		txtUserPwd=new JPasswordField(15);
		txtUserPwd.setEchoChar('*');
		
		jbLogin=new JButton("登陆");
		jrbTeacher=new JRadioButton("教师",true);
		jrbStudent=new JRadioButton("学生",false);
		jrbManage=new JRadioButton("管理员",false);
		jrbMainTeacher=new JRadioButton("班主任",false);
		
		jbLogin.addActionListener(this);
		jrbTeacher.addItemListener(this);
		jrbStudent.addItemListener(this);
		jrbManage.addItemListener(this);
		jrbMainTeacher.addItemListener(this);
		
		jbtType=new ButtonGroup();
		jbtType.add(jrbStudent);
		jbtType.add(jrbMainTeacher);
		jbtType.add(jrbManage);
		jbtType.add(jrbTeacher);
		
		/*为空间定义外观和显示*/
		Container c=getContentPane();
		c.setLayout(null);
		/*添加标签到容器里*/
		c.add(lblName);
		c.add(lblPwd);
		c.add(lblNote);
		c.add(lblSelect);
		c.add(txtUserName);
		c.add(txtUserPwd);
		c.add(jbLogin);
		c.add(jrbMainTeacher);
		c.add(jrbManage);
		c.add(jrbStudent);
		c.add(jrbTeacher);
		
		
		lblName.setBounds(40,40,40,35);
		txtUserName.setBounds(85,40,140,35);
		lblPwd.setBounds(40,100,40,35);
		txtUserPwd.setBounds(85,100,140,35);
		lblSelect.setBounds(40,140,100,35);
		jrbStudent.setBounds(40,180,60,30);
		jrbTeacher.setBounds(110,180,60,30);
		jrbManage.setBounds(180,180,90,30);
		jrbMainTeacher.setBounds(280,180,90,30);
		jbLogin.setBounds(120,250,100,30);
		lblNote.setBounds(40,290,300,30);
		
		
		addWindowListener(new WindowAdapter(){
			public void WindowClosing(WindowEvent ew){
				dispose();
			}
		});
		
		this.setBounds(300,50,500,450);
		this.setVisible(true);
		this.setResizable(false);
	}
	/*个动作按钮的响应*/
	public void actionPerformed(java.awt.event.ActionEvent evt){
		db.dbconn();
		sql="SELECT * FROM "+userType;
		db.dbSelect(sql);
		try{
			while(db.rs.next()){
				if(txtUserName.getText().equals(db.rs.getString(2))&&
						String.valueOf(txtUserPwd.getText()).equals(db.rs.getString(3))){
					if(userType.equals("student")){
						int tempIndex=Integer.parseInt(db.rs.getString(1));
						lblNote.setText(userType+"登陆成功！"+tempIndex);
						lblNote.setVisible(true);
						new StudentGUI(tempIndex).setVisible(true);
						dispose();
					}else if(userType.equals("teacher")){
						new TeacherGUI(txtUserName.getText());
						dispose();
					}else if(userType.equals("mainteacher")){
						new MainTeacherGUI(txtUserName.getText());
						dispose();
					}else if(userType.equals("manage")){
						new ManageGUI().setVisible(true);
						dispose();
					}
//					lblNote.setText(userType+"登陆成功！");
//					lblNote.setVisible(true);
					db.dbclose();
					break;
				}else{
					lblNote.setText(userType+"登陆失败！");
					lblNote.setVisible(true);
				}
			}
		}catch(SQLException e){
			System.err.println(e.toString());
		}
		db.dbclose();
	}
	/*重载选项事件的方法*/
	public void itemStateChanged(ItemEvent e){
		if(e.getItemSelectable() instanceof JRadioButton){
			JRadioButton ck=(JRadioButton)(e.getItemSelectable());
			if(ck.isSelected()){
				if(ck.getText().equals("教师"))
					userType="teacher";
				else if(ck.getText().equals("学生"))
					userType="student";
				else if(ck.getText().equals("管理员"))
					userType="manage";
				else
					userType="mainteacher";
			}else
				userType="";
		}
	}
}

package manageGUI;

import sql.*;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import java.sql.*;

public class MainTeacherGUI extends JFrame{
	/*定义标签*/
	JLabel lblName;
	JLabel lblNumber;
	JLabel lblSex;
	JLabel lblPassword;
	JLabel lblNote;
	/*定义文本框*/
	JTextField txtName;
	JTextField txtNumber;
	JTextField txtSex;
	JTextField txtPassword;
	/*定义显示文本域及滚动面板*/
	JTextArea areaTxt;
	JScrollPane scrollPane;
	/*数据库语句定义*/
	DBAccess db;
	String sql;
	String userName;
	/*构造函数*/
	public MainTeacherGUI(String username){
		/*初始化用户*/
		this.userName=username;
		/*初始化标签*/
		lblName=new JLabel("姓名：");
		lblNumber=new JLabel("编号：");
		lblSex=new JLabel("性别：");
		lblPassword=new JLabel("密码：");
		lblNote=new JLabel("您所管理班级的学生成绩如下：");
		/*初始化文本框*/
		txtName=new JTextField(30);
		txtNumber=new JTextField(30);
		txtSex=new JTextField(30);
		txtPassword=new JTextField(30);
		/*初始化文本域*/
		areaTxt=new JTextArea(15,10);
		scrollPane=new JScrollPane(areaTxt);
		/*初始化容器*/
		areaTxt.setEditable(false);
		Container c=getContentPane();
		c.setLayout(null);
		/*添加组件*/
		c.add(lblName);
		c.add(lblNote);
		c.add(lblNumber);
		c.add(lblPassword);
		c.add(lblSex);
		c.add(txtName);
		c.add(txtNumber);
		c.add(txtPassword);
		c.add(txtSex);
		c.add(scrollPane);
		/*布局组件*/
		lblName.setBounds(40,20,60,30);
		txtName.setBounds(100,20,100,30);
		lblNumber.setBounds(200,20,60,30);
		txtNumber.setBounds(260,20,100,30);
		lblSex.setBounds(360,20,60,30);
		txtSex.setBounds(420,20,100,30);
		lblNote.setBounds(40,60,300,30);
		scrollPane.setBounds(40,100,520,400);
		/*主窗口初始化*/
		this.setBounds(300,50,700,550);
		this.setVisible(true);
		this.setResizable(false);
		/*添加关闭窗口事件*/
		addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent ew){
				dispose();
			}
		});
		/*链接数据库，根据用户类型，读出相关信息*/
		DBAccess db=new DBAccess();
		db.dbconn();
		sql="SELECT * FROM student";
		db.dbSelect(sql);
		try{
			while(db.rs.next()){
				areaTxt.append("\n 姓名："+db.rs.getString(2)+"编号："+db.rs.getString(4)+
						"性别："+db.rs.getString(5)+"英语："+db.rs.getString(6)+"java："+
						db.rs.getString(7)+"math："+db.rs.getString(8)+"C++："+db.rs.getString(9));
			}
		}catch(SQLException e){
			System.err.println(e.toString());
		}
		db.dbclose();
		/*连接数据库，读取用户信息*/
		db.dbconn();
		sql="SELECT * FROM mainteacher WHERE username ='"+userName+"'";
		db.dbSelect(sql);
		try{
			while(db.rs.next()){
				txtName.setText(db.rs.getString(2));
				txtName.setEditable(false);
				txtNumber.setText(db.rs.getString(4));
				txtNumber.setEditable(false);
				txtSex.setText(db.rs.getString(5));
				txtSex.setEditable(false);
			}
		}catch(SQLException e){
			System.err.println(e.toString());
		}
	}
}

package manageGUI;

import sql.*;
import user.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.sql.*;
import java.util.*;

public class ManageGUI extends JFrame implements ActionListener,ItemListener{
	/*定义数据库对象*/
	DBAccess db;
	String sql;
	String userType="";
	int findflag;
	/*定义标签*/
	JLabel lblName;
	JLabel lblNumber;
	JLabel lblSex;
	JLabel lblEnglish;
	JLabel lblJava;
	JLabel lblC;
	JLabel lblMath;
	JLabel lblPassword;
	/*定义文本框*/
	JTextField txtName;
	JTextField txtNumber;
	JTextField txtSex;
	JTextField txtEnglish;
	JTextField txtJava;
	JTextField txtC;
	JTextField txtMath;
	JTextField txtPassword;
	JTextArea areaTxt;
	/*定义按钮*/
	JButton jbtnCreateUser;
	JButton jbtnDeleteUser;
	JButton jbtnUpdateUserPassword;
	/*定义选择按钮*/
	JRadioButton jrbStudent;
	JRadioButton jrbTeacher;
	JRadioButton jrbManage;
	JRadioButton jrbMainTeacher;
	/*定义按钮组*/
	ButtonGroup btgUserType;
	/*定义滚动面板*/
	JScrollPane scrollPane;
	/*构造函数*/
	public ManageGUI(){
		/*初始化窗口标题*/
		this.setTitle("管理员操作界面");
		/*初始化标签*/
		lblName=new JLabel("姓名：");
		lblNumber=new JLabel("编号：");
		lblSex=new JLabel("性别：");
		lblEnglish=new JLabel("英语：");
		lblC=new JLabel("C：");
		lblMath=new JLabel("数学：");
		lblJava=new JLabel("java：");
		lblPassword=new JLabel("密码：");
		/*初始化文本框*/
		txtName=new JTextField(30);
		txtNumber=new JTextField(30);
		txtSex=new JTextField(30);
		txtEnglish=new JTextField(30);
		txtJava=new JTextField(30);
		txtC=new JTextField(30);
		txtMath=new JTextField(30);
		txtPassword=new JTextField(30);
		/*初始化文本域*/
		areaTxt=new JTextArea(10,10);
		/*初始化按钮*/
		jbtnCreateUser=new JButton("创建用户");
		jbtnDeleteUser=new JButton("删除用户");
		jbtnUpdateUserPassword=new JButton("更改密码");
		/*注册按钮事件监听器*/
		jbtnCreateUser.addActionListener(this);
		jbtnDeleteUser.addActionListener(this);
		jbtnUpdateUserPassword.addActionListener(this);
		/*初始化选择按钮*/
		jrbStudent=new JRadioButton("学生",false);
		jrbTeacher=new JRadioButton("老师",false);
		jrbManage=new JRadioButton("管理员",false);
		jrbMainTeacher=new JRadioButton("班主任",false);
		btgUserType=new ButtonGroup();
		/*加入按钮组，选择按钮形成互斥*/
		btgUserType.add(jrbMainTeacher);
		btgUserType.add(jrbManage);
		btgUserType.add(jrbTeacher);
		btgUserType.add(jrbStudent);
		/*注册选择俺就事件监听器*/
		jrbStudent.addItemListener(this);
		jrbTeacher.addItemListener(this);
		jrbManage.addItemListener(this);
		jrbMainTeacher.addItemListener(this);
		/*初始化滚动面板*/
		scrollPane=new JScrollPane(areaTxt);
		/*初始化容器*/
		Container c=getContentPane();
		c.setLayout(null);
		/*将组建加入容器*/
		c.add(lblC);
		c.add(lblEnglish);
		c.add(lblJava);
		c.add(lblMath);
		c.add(lblName);
		c.add(lblNumber);
		c.add(lblSex);
		c.add(lblPassword);
		
		c.add(txtC);
		c.add(txtEnglish);
		c.add(txtJava);
		c.add(txtMath);
		c.add(txtName);
		c.add(txtNumber);
		c.add(txtPassword);
		c.add(txtSex);
		
		c.add(jbtnCreateUser);
		c.add(jbtnDeleteUser);
		c.add(jbtnUpdateUserPassword);
	
		c.add(jrbMainTeacher);
		c.add(jrbManage);
		c.add(jrbStudent);
		c.add(jrbTeacher);
		c.add(scrollPane);
		/*布局组件*/
		lblName.setBounds(40,20,60,30);
		txtName.setBounds(100,20,60,30);
		lblNumber.setBounds(160,20,60,30);
		txtNumber.setBounds(220,20,60,30);
		lblSex.setBounds(280,20,60,30);
		txtSex.setBounds(340,20,60,30);
		lblPassword.setBounds(400,20,60,30);
		txtPassword.setBounds(460,20,60,30);
		
		lblEnglish.setBounds(40,60,60,30);
		txtEnglish.setBounds(100,60,60,30);
		lblC.setBounds(160,60,60,30);
		txtC.setBounds(220,60,60,30);
		lblMath.setBounds(280,60,60,30);
		txtMath.setBounds(340,60,60,30);
		lblJava.setBounds(400,60,60,30);
		txtJava.setBounds(460,60,60,30);
		
		jrbMainTeacher.setBounds(40,100,120,40);
		jrbTeacher.setBounds(170,100,120,40);
		jrbStudent.setBounds(300,100,120,40);
		jrbManage.setBounds(430,100,120,40);
		
		areaTxt.setEditable(false);
		areaTxt.setVisible(true);
		scrollPane.setBounds(40,150,500,300);
		jbtnCreateUser.setBounds(550,150,120,30);
		jbtnDeleteUser.setBounds(550,190,120,30);
		jbtnUpdateUserPassword.setBounds(550,230,120,30);
		/*设置窗口大小及位置*/
		this.setBounds(300,50,700,550);
		this.setVisible(true);
		this.setResizable(false);
		/*添加窗口关闭事件*/
		addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent ew){
				dispose();
			}
		});
		db=new DBAccess();
	}
	/*重载动作事件，让各按钮具备其功能*/
	public void actionPerformed(ActionEvent evt){
		if(evt.getActionCommand().equals("创建用户")){//单击创建用户按钮时
			if(userType.equals("teacher")){	//判断用户身份为teacher
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")||
						txtSex.getText().trim().equals("")||txtNumber.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					areaTxt.append(db.notes);
					sql="INSERT INTO "+userType+"(username,userpwd,usersex,usernum)" +"VALUES('"+
							txtName.getText()+"','"+txtPassword.getText()+"','"+txtSex.getText()+"','"+
							txtNumber.getText()+"')";
					db.dbconn();
					db.dbInsert(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 插入信息如下：");
						areaTxt.append("\n "+sql);
						areaTxt.append("\n 姓名："+txtName.getText()+"性别："+txtSex.getText()+"编号："+txtNumber.getText()+
								"密码："+txtPassword.getText());
					}else
						areaTxt.append(db.notes);
				}
			}else if(userType.equals("student")){//判断用户身份为student
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")||
						txtSex.getText().trim().equals("")||txtNumber.getText().trim().equals("")||
						txtEnglish.getText().trim().equals("")||txtJava.getText().trim().equals("")||
						txtC.getText().trim().equals("")||txtMath.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					sql="INSERT INTO "+userType+"(username,userpwd,usernum,ssex,english,Java,Math,c)"+
							"VALUES('"+txtName.getText()+"','"+txtPassword.getText()+"','"+txtNumber.getText()+
							"','"+txtSex.getText()+"','"+txtEnglish.getText()+"','"+txtJava.getText()+"','"+
							txtMath.getText()+"','"+txtC.getText()+"')";
					db.dbconn();
					db.dbInsert(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 插入信息如下：");
						areaTxt.append("\n 姓名："+txtName.getText()+"性别："+txtSex.getText()+"编号："+txtNumber.getText()+
								"密码："+txtPassword.getText()+"英语："+txtEnglish.getText()+"java："+txtJava.getText()+
								"数学："+txtMath.getText()+"c++："+txtC.getText());
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
						}
				}
			}else if(userType.equals("mainteacher")){//判断用户身份为mainteacher
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")||
						txtSex.getText().trim().equals("")||txtNumber.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					sql="INSERT INTO "+userType+"(username,userpwd,usernum,usersex)"+"VALUES('"+txtName.getText()+
							"','"+txtPassword.getText()+"','"+txtNumber.getText()+"','"+txtSex.getText()+"')";
					db.dbconn();
					db.dbInsert(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 插入信息如下：");
						areaTxt.append("\n 姓名："+txtName.getText()+"性别："+txtSex.getText()+"编号："+txtNumber.getText()+
								"密码："+txtPassword.getText());
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
					}
				}
			}else if(userType.equals("manage")){//判断用户身份为manage
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")||
						txtSex.getText().trim().equals("")||txtNumber.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					sql="INSERT INTO "+userType+"(username,userpwd,usernum,usersex)"+"VALUES('"+txtName.getText()+
							"','"+txtPassword.getText()+"','"+txtNumber.getText()+"','"+txtSex.getText()+"')";
					db.dbconn();
					db.dbInsert(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 插入信息如下：");
						areaTxt.append("\n 姓名："+txtName.getText()+"性别："+txtSex.getText()+"编号："+txtNumber.getText()+
								"密码："+txtPassword.getText());
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
					}
				}
			}else{//如果没有选择用户身份，则提示
				areaTxt.append("\n 请选择身!");
			}
		}else if(evt.getActionCommand().equals("删除用户")){//单击删除用户按钮时
			if(userType.equals("teacher")){//判断当前用户身份为teacher
				if(txtName.getText().trim().equals("")){
					areaTxt.append("\n 用户名不能为空！");
				}else{
					sql="DELETE FROM teacher WHERE username='"+txtName.getText()+"'";
					db.dbconn();
					db.dbDelete(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
					}
				}
			}else if(userType.equals("manage")){//判断当前用户身份为manage
				if(txtName.getText().trim().equals("")){
					areaTxt.append("\n 用户名不能为空！");
				}else{
					sql="DELETE FROM manage WHERE username='"+txtName.getText()+"'";
					db.dbconn();
					db.dbDelete(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
					}
				}
			}else if(userType.equals("student")){//判断当前用户身份为student
				if(txtName.getText().trim().equals("")){
					areaTxt.append("\n 用户名不能为空！");
				}else{
					sql="DELETE FROM student WHERE username='"+txtName.getText()+"'";
					db.dbconn();
					db.dbDelete(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
					}
				}
			}else if(userType.equals("mainteacher")){//判断当前用户身份为mainteacher
				if(txtName.getText().trim().equals("")){
					areaTxt.append("\n 用户名不能为空！");
				}else{
					sql="DELETE FROM mainteacher WHERE username='"+txtName.getText()+"'";
					db.dbconn();
					db.dbDelete(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
					}
				}
			}else{//如果当前用户没有选择身份
				areaTxt.append("\n 请选择您的当前身份！");
			}
		}else if(evt.getActionCommand().equals("更改密码")){//单击更改密码时
			if(userType.equals("teacher")){//判断当前用户身份为teacher
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					sql="UPDATE teacher SET userpwd='"+txtPassword.getText()+"' WHERE username='"+
							txtName.getText()+"'";
					db.dbconn();
					db.dbUpdate(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 执行信息如下：");
						areaTxt.append("\n 姓名："+txtName.getText()+" 更改后的密码："+txtPassword.getText());
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
						}
				}
			}else if(userType.equals("student")){//判断当前用户身份为student
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					sql="UPDATE student SET userpwd='"+txtPassword.getText()+"' WHERE username='"+
							txtName.getText()+"'";
					db.dbconn();
					db.dbUpdate(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 执行信息如下：");
						areaTxt.append("\n 姓名："+txtName.getText()+" 更改后的密码："+txtPassword.getText());
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
						}
				}
			}else if(userType.equals("manage")){//判断当前用户身份为manage
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					sql="UPDATE manage SET userpwd='"+txtPassword.getText()+"' WHERE username='"+
							txtName.getText()+"'";
					db.dbconn();
					db.dbUpdate(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 执行信息如下：");
						areaTxt.append("\n 姓名："+txtName.getText()+" 更改后的密码："+txtPassword.getText());
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
						}
				}
			}else if(userType.equals("mainteacher")){//判断当前用户身份为mainteacher
				if(txtName.getText().trim().equals("")||txtPassword.getText().trim().equals("")){
					areaTxt.append("\n 输入框不能为空！");
				}else{
					sql="UPDATE mainteacher SET userpwd='"+txtPassword.getText()+"' WHERE username='"+
							txtName.getText()+"'";
					db.dbconn();
					db.dbUpdate(sql);
					db.dbclose();
					if(db.sqlflag==1){
						areaTxt.append(db.notes);
						areaTxt.append("\n 执行信息如下：");
						areaTxt.append("\n 姓名："+txtName.getText()+" 更改后的密码："+txtPassword.getText());
					}else{
						areaTxt.append(db.notes);
						areaTxt.append("\n"+sql);
						}
				}
			}else{
				areaTxt.append("\n 请选择您当前的身份！");
			}
		}else{
			
		}
	}
	/*重载选择按钮事件*/
	public void itemStateChanged(ItemEvent e){
		if(e.getItemSelectable() instanceof JRadioButton){
			JRadioButton ck=(JRadioButton)(e.getItemSelectable());
			if(ck.isSelected()){
				if(ck.getText().equals("老师")){
					userType="teacher";
					areaTxt.append("\n 您当前的身份是："+userType);
					reset();
					txtEnglish.setEditable(false);
					txtC.setEditable(false);
					txtJava.setEditable(false);
					txtMath.setEditable(false);
					}
				if(ck.getText().equals("学生")){
					userType="student";
					reset();
					txtEnglish.setEditable(true);
					txtC.setEditable(true);
					txtJava.setEditable(true);
					txtMath.setEditable(true);
					areaTxt.append("\n 您当前的身份是："+userType);
				}
				if(ck.getText().equals("管理员")){
					userType="manage";
					reset();
					areaTxt.append("\n 您当前的身份是："+userType);
					txtEnglish.setEditable(false);
					txtC.setEditable(false);
					txtJava.setEditable(false);
					txtMath.setEditable(false);
				}
				if(ck.getText().equals("班主任")){
					userType="mainteacher";
					reset();
					areaTxt.append("\n 您当前的身份是："+userType);
					txtEnglish.setEditable(false);
					txtC.setEditable(false);
					txtJava.setEditable(false);
					txtMath.setEditable(false);
				}
			}
		}else
			userType="";
		
	}
	/*清除文本框文本函数*/
	public void reset(){
		txtName.setText("");
		txtNumber.setText("");
		txtSex.setText("");
		txtPassword.setText("");
		txtC.setText("");
		txtJava.setText("");
		txtMath.setText("");
		txtEnglish.setText("");
	}
}

package manageGUI;
import sql.*;
import user.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import java.sql.*;

public class StudentGUI extends JFrame{
	/*定义标签*/
	JLabel lblName;
	JLabel lblNumber;
	JLabel lblSex;
	JLabel lblNote;
	/*定义文本框*/
	JTextField txtName;
	JTextField txtNumber;
	JTextField txtSex;
	/*定义表格及滚动面板*/
	JScrollPane scrollPane;
	JTable jTable;
	DefaultTableModel dModel;
	int StuNum;
	String[] st;
	/*定义数据库对象*/
	DBAccess db;
	String sql;
	int findflag;
	/*构造函数*/
	public StudentGUI(int StuNum){
		String[] title={"姓名","学号","性别","english","java","c++","math"};
		String[][] data0=new String[0][0];//表格数据源，初始化为0
		dModel=new DefaultTableModel(data0,title);
		jTable=new JTable(dModel);//用默认的数据模型，新建一张表对象
		jTable.setAutoscrolls(true);//支持自动产生滚动条
		jTable.setGridColor(Color.blue);//设置表格线条颜色
		jTable.setRowHeight(25);
		JScrollPane jstb=new JScrollPane(jTable);//将表格放到滚动面板中
		/*链接数据库*/
		this.StuNum=StuNum;
		db=new DBAccess();
		db.dbconn();
		sql="SELECT * FROM student WHERE ID="+StuNum;
		display(sql);
		/*设置窗口标题*/
		this.setTitle("学生登陆界面");
		/*初始化标签*/
		lblName=new JLabel("姓名：");
		lblNumber=new JLabel("学号：");
		lblSex=new JLabel("性别：");
		lblNote=new JLabel("您的信息如下：");
		/*初始化文本框*/
		txtName=new JTextField(30);
		txtNumber=new JTextField(30);
		txtSex=new JTextField(30);
		/*初始化容器*/
		Container c=getContentPane();
		c.setLayout(null);
		/*向容器添加组件*/
		c.add(lblName);
		c.add(lblNumber);
		c.add(lblSex);
		c.add(txtName);
		c.add(txtNumber);
		c.add(txtSex);
		c.add(lblNote);
		c.add(jstb);
		/*文本框不可编辑*/
		txtName.setEditable(false);
		txtNumber.setEditable(false);
		txtSex.setEditable(false);
		/*布局组件*/
		lblName.setBounds(40,40,60,30);
		txtName.setBounds(100,40,60,30);
		lblNumber.setBounds(180,40,60,30);
		txtNumber.setBounds(250,40,60,30);
		lblSex.setBounds(320,40,60,30);
		txtSex.setBounds(390,40,60,30);
		lblNote.setBounds(40,100,300,30);
		jstb.setBounds(40,140,390,300);
		/*添加窗口关闭功能事件*/
		addWindowListener(new WindowAdapter(){
			public void WindowClosing(WindowEvent ew){
				dispose();
			}
		});
		/*主窗口位置及大小设置*/
		this.setBounds(300,50,650,550);
		this.setVisible(true);
		this.setResizable(false);
	}
	/*数据读取函数*/
	public void display(String sql1){
		db.dbconn();
		db.dbSelect(sql1);
		try{
			while(db.rs.next()){
				findflag=1;//标识着查到了记录
				Student st=new Student();
				st.setStuName(db.rs.getString(2));
				st.setStuNum(db.rs.getString(3));
				st.setStuSex(db.rs.getString(4));
				Score sc=new Score();
				sc.setC(db.rs.getInt(5));
				sc.setEnglish(db.rs.getInt(6));
				sc.setJava(db.rs.getInt(7));
				sc.setMath(db.rs.getInt(8));
				inputData(sc,st);
			}
		}catch(SQLException e){
			System.err.println(e.toString());
		}
		db.dbclose();
	}
	/*将数据添加到数据源*/
	public void inputData(Score sc,Student st){
		//Score sc=new Score();
		
		Vector data=new Vector();
		data.addElement(st.getStuName());
		data.addElement(st.getStuSex());
		data.addElement(st.getStuNum());
		data.addElement(Double.valueOf(sc.getC()).toString());
		data.addElement(Double.valueOf(sc.getEnglish()).toString());
		data.addElement(Double.valueOf(sc.getJava()).toString());
		data.addElement(Double.valueOf(sc.getMath()).toString());
		dModel.addRow(data);
	}
}

package manageGUI;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import java.sql.*;

import sql.*;

public class TeacherGUI extends JFrame implements ItemListener,ActionListener{
	/*定义标签*/
	JLabel lblName;
	JLabel lblNumber;
	JLabel lblSex;
	JLabel lblPassword;
	JLabel lblNote;
	JLabel lblNote2;
	/*定义文本框*/
	JTextField txtName;
	JTextField txtNumber;
	JTextField txtSex;
	JTextField txtPassword;
	/*定义按钮*/
	JButton btnSelect;
	/*定义选择按钮*/
	JRadioButton jrbEnglish;
	JRadioButton jrbMath;
	JRadioButton jrbC;
	JRadioButton jrbJava;
	ButtonGroup btgCorse;
	/*定义文本域及滚动面板*/
	JTextArea areaTxt;
	JScrollPane scrollPane;
	/*数据库对象定义*/
	DBAccess db;
	String sql;
	String userName;
	String selectType;
	/*构造函数*/
	public TeacherGUI(String username){
		/*初始化窗口标题*/
		this.userName=username;
		/*初始化标签*/
		lblName=new JLabel("姓名：");
		lblNumber=new JLabel("编号：");
		lblSex=new JLabel("性别：");
		lblPassword=new JLabel("密码：");
		lblNote=new JLabel("请选择要查看的科目：");
		lblNote2=new JLabel("您要查找的信息如下：");
		/*初始化文本框*/
		txtName=new JTextField(60);
		txtPassword=new JTextField(60);
		txtSex=new JTextField(60);
		txtNumber=new JTextField(60);
		/*设置文本框编辑状态*/
		txtName.setEditable(false);
		txtPassword.setEditable(false);
		txtSex.setEditable(false);
		txtNumber.setEditable(false);
		/*初始化按钮*/
		btnSelect=new JButton("查询");
		/*初始化选择按钮*/
		jrbEnglish=new JRadioButton("英语",false);
		jrbJava=new JRadioButton("JAVA",false);
		jrbMath=new JRadioButton("数学",false);
		jrbC=new JRadioButton("c++",false);
		btgCorse=new ButtonGroup();
		btgCorse.add(jrbC);
		btgCorse.add(jrbEnglish);
		btgCorse.add(jrbJava);
		btgCorse.add(jrbMath);
		/*初始化文本域*/
		areaTxt=new JTextArea(10,10);
		scrollPane=new JScrollPane(areaTxt);
		/*选择按钮注册监听事件*/
		jrbEnglish.addItemListener(this);
		jrbC.addItemListener(this);
		jrbJava.addItemListener(this);
		jrbMath.addItemListener(this);
		/*注册监听事件*/
		btnSelect.addActionListener(this);
		/*初始化容器*/
		Container c=getContentPane();
		c.setLayout(null);
		/*将组建加入容器*/
		c.add(lblNumber);
		c.add(lblName);
		c.add(lblSex);
		c.add(lblNote);
		c.add(lblNote2);
		c.add(lblPassword);
		c.add(txtName);
		c.add(txtNumber);
		c.add(txtPassword);
		c.add(txtSex);
		c.add(btnSelect);
		c.add(jrbC);
		c.add(jrbEnglish);
		c.add(jrbJava);
		c.add(jrbMath);
		c.add(scrollPane);
		/*布局组建*/
		lblName.setBounds(40,20,50,30);
		txtName.setBounds(90,20,100,30);
		lblNumber.setBounds(190,20,50,30);
		txtNumber.setBounds(240,20,100,30);
		lblSex.setBounds(340,20,50,30);
		txtSex.setBounds(390,20,100,30);
		lblPassword.setBounds(490,20,50,30);
		txtPassword.setBounds(540,20,100,30);
		
		lblNote.setBounds(40,60,200,30);
		jrbEnglish.setBounds(240,60,60,30);
		jrbJava.setBounds(300,60,60,30);
		jrbC.setBounds(360,60,60,30);
		jrbMath.setBounds(420,60,60,30);
		
		btnSelect.setBounds(480,60,60,30);
		
		scrollPane.setBounds(40,100,600,300);
		/*设置窗口大小及位置*/
		this.setBounds(300,50,700,650);
		this.setVisible(true);
		this.setResizable(false);
		/*添加窗口关闭功能事件*/
		addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent ew){
				dispose();
			}
		});
		/*链接数据库*/
		DBAccess db=new DBAccess();
		db.dbconn();
		sql="SELECT * FROM teacher WHERE username='"+userName+"'";
		db.dbSelect(sql);
		try{
			while(db.rs.next()){
				txtName.setText(db.rs.getString(2));
				txtPassword.setText(db.rs.getString(3));
				txtSex.setText(db.rs.getString(4));
				txtNumber.setText(db.rs.getString(5));
			}
		}catch(SQLException e){
			System.err.println(e.toString());
		}
	}
	/*重载选择按钮事件*/
	public void itemStateChanged(ItemEvent e){
		if(e.getItemSelectable() instanceof JRadioButton){
			JRadioButton ck=(JRadioButton)(e.getItemSelectable());
			if(ck.isSelected()){
				selectType=ck.getText();
			}else{
				selectType="";
			}
		}
	}
	/*定义动作事件*/
	public void actionPerformed(ActionEvent e){
		DBAccess db=new DBAccess();
		db.dbconn();
		int index=0;
		if(selectType.equals("英语"))
			index=6;
		else if(selectType.equals("数学"))
			index=8;
		else if(selectType.equals("JAVA"))
			index=7;
		else if(selectType.equals("c++"))
			index=9;
		sql="SELECT * FROM student";
		db.dbSelect(sql);
		try{
			while(db.rs.next()){
				areaTxt.append("\n"+"姓名："+db.rs.getString(2)+"  编号："+db.rs.getString(4)+
						"  性别："+db.rs.getString(5)+"  "+this.selectType+db.rs.getShort(index));
			}
		}catch(SQLException es){
			System.err.println(es.toString());
		}
		db.dbclose();
	}
}