成绩系统

package a;

import java.sql.*;

public class A {
	public Connection database()
	{
		Connection connect;
		try {
        	connect = DriverManager.getConnection("jdbc:mysql://localhost:3306/b?&useSSL=false&serverTimezone=UTC","root","123456");
        	return connect;
		}catch(Exception e)
		{
			e.printStackTrace();  
		}
		return null;		
	}
	public boolean queryEmpty(String A)
    {
    	boolean flag=false;
        if(A==null||"".equals(A))
        {
            flag=true;
        }
        return flag;
    }
	public void addS(String A,String B,String C,String D,String E)
	{
		try {
			PreparedStatement preparedStatement=null;
        	Connection connect =database();  	
        	preparedStatement=connect.prepareStatement("insert into achievement (number,name,class,curriculum,achievement) values (?,?,?,?,?)");
            preparedStatement.setString(1,A);
            preparedStatement.setString(2,B);
            preparedStatement.setString(3,C);
            preparedStatement.setString(4,D);
            preparedStatement.setString(5,E);
            preparedStatement.executeUpdate();  
            connect.close();
            preparedStatement.close();           
		}catch(SQLException e){
			e.printStackTrace();  
		}
	}
	public void addT(String A,String B)
	{
		try {
			PreparedStatement preparedStatement=null;
        	Connection connect =database();  	
        	preparedStatement=connect.prepareStatement("insert into account (number,password) values (?,?)");
            preparedStatement.setString(1,A);
            preparedStatement.setString(2,B);
            preparedStatement.executeUpdate();  
            connect.close();
            preparedStatement.close();           
		}catch(SQLException e){
			e.printStackTrace();  
		}
	}
	public void modify(String A,String B)
	{
		try {
			PreparedStatement preparedStatement=null;
        	Connection connect = database();       	
        	preparedStatement=connect.prepareStatement("Update achievement set achievement=? where number=?");
            preparedStatement.setString(1,A);
            preparedStatement.setString(2,B);
            preparedStatement.executeUpdate();  
            preparedStatement.execute();
            connect.close();   
            preparedStatement.close();
		}catch(SQLException e){
			e.printStackTrace();  
		}
	}
	public void deletedata(String A)
    {
		try {
			PreparedStatement preparedStatement=null;
			Connection connect = database();       	
        	preparedStatement=connect.prepareStatement("delete from achievement where number = ?");
            preparedStatement.setString(1,A);
            preparedStatement.executeUpdate();  
            connect.close();
            preparedStatement.close();           
		}catch(SQLException e){
			e.printStackTrace();  
		}
    }
	public boolean judge(String A)
    {   	
    	boolean flag=true;     
        try {
        	Connection connect = database();
            Statement stmt = connect.createStatement();
            ResultSet rs = stmt.executeQuery("select * from account");
            while(rs.next())
            {
            	if(A.equals(rs.getString("number")))
                {               		            		
            		flag=false;                  
                } 
            }            	           	                           
            rs.close();           
            stmt.close();
            connect.close();
        }catch (SQLException e) {
            e.printStackTrace();            
        }
        return  flag;
    }
	public boolean judgepassword(String A,String B)
    {   	
    	boolean flag=true;     
        try {
        	Connection connect = database();
            Statement stmt = connect.createStatement();
            ResultSet rs = stmt.executeQuery("select * from account");
            while(rs.next())
            {
            	if(A.equals(rs.getString("number"))&&B.equals(rs.getString("password")))
                {               		            		
            		flag=false;                  
                } 
            }            	           	                           
            rs.close();           
            stmt.close();
            connect.close();
        }catch (SQLException e) {
            e.printStackTrace();            
        }
        return  flag;
    }
	public boolean judgeS(String A)
    {   	
    	boolean flag=false;     
        try {
        	Connection connect = database();
            Statement stmt = connect.createStatement();
            ResultSet rs = stmt.executeQuery("select * from achievement");
            while(rs.next())
            {
            	if(A.equals(rs.getString("number")))
                {               		            		
            		flag=true;                  
                } 
            }            	           	                           
            rs.close();           
            stmt.close();
            connect.close();
        }catch (SQLException e) {
            e.printStackTrace();            
        }
        return  flag;
    }
	public boolean numberInt(String A)
	{
		boolean flag=true;
		try {  
	        double a=Integer.valueOf(A);
	        if(a>=0) flag=false;
	        return flag; 
	    } catch (Exception e) {  
	        return flag;   
	    }  
	}
	public static void main(String[] args)
	{
		A a=new A();
	}
}

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>处理</title>
</head>
<body>
<jsp:useBean id="util" class="a.A" scope="page" />
<% 
  String number=(String)request.getParameter("number");
  String name=(String)request.getParameter("name");
  String Class=(String)request.getParameter("class");
  String curriculum=(String)request.getParameter("curriculum");
  String achievement=(String)request.getParameter("achievement");
  if(util.queryEmpty(number)||util.queryEmpty(name)||util.queryEmpty(Class)||util.queryEmpty(curriculum)||util.queryEmpty(achievement)){
	  out.print("<script language ='javaScript'> alert('输入不能为空');window.history.back(-1); </script>");
  }else if(util.judgeS(number)){
	  out.print("<script language ='javaScript'> alert('学号已存在');window.history.back(-1); </script>");
  }else if(util.numberInt(achievement)){
	  out.print("<script language ='javaScript'> alert('成绩输入不规范');window.history.back(-1); </script>");
  }else{
	  util.addS(number, name, Class, curriculum, achievement);
	  out.print("<script language='javaScript'> alert('添加成功');</script>");
		response.setHeader("refresh", "0;url=teacher.jsp");   
  }
%>
</body>
</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>增加</title>
</head>
    <form id="1" action ="addback.jsp" method="get">   
   <p style="text-align:center;color:black;font-family:楷体; font-size:20px">    
                <br>
                学号:             
                    <input type="text" name="number"size="15"/>
                <br><br>                
                姓名:               
                    <input type="text" name="name"size="16"/>   
                    <br><br>                
                班级:               
                    <input type="text" name="class"size="16"/>  
                    <br><br>                
                学科:               
                    <input type="text" name="curriculum"size="16"/>  
                    <br><br>                
                成绩:               
                    <input type="text" name="achievement"size="16"/>                      
                <br><br>                  
                <br><br>            
                    <input type="submit" value="增加"/>
                <br><br> 
                    <input type="button" value="返回上一页" onclick="javascript:history.back(-1)" />     
    </p>
    </form>  

</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>删除</title>
</head>
    <form id="1" action ="delSback.jsp" method="get">   
   <p style="text-align:center;color:black;font-family:楷体; font-size:20px">    
                <br>
                账号:             
                    <input type="text" name="number"size="15"/>
                <br><br>                                
                <br><br>            
                    <input type="submit" value="删除"/>
                <br><br>            
                    <input type="button" value="返回上一页" onclick="javascript:history.back(-1)" />      
    </p>
    </form>  

</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>处理</title>
</head>
<body>
<jsp:useBean id="util" class="a.A" scope="page" />
<% 
  String number=(String)request.getParameter("number");
  if(util.queryEmpty(number)){
	  out.print("<script language ='javaScript'> alert('输入不能为空');window.history.back(-1); </script>");
  }else if(!util.judgeS(number)){
	  out.print("<script language ='javaScript'> alert('学号不存在');window.history.back(-1); </script>");
  }else{
	  util.deletedata(number);
	  out.print("<script language='javaScript'> alert('删除成功');</script>");
		response.setHeader("refresh", "0;url=teacher.jsp");   
  }
%>
</body>
</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>登录系统</title>
</head>
    <form id="1" action ="signIn.jsp" method="get">   
   <p style="text-align:center;color:black;font-family:楷体; font-size:20px">    
                <br>
                账号:             
                    <input type="text" name="number"size="15"/>
                <br><br>                
                密码:               
                    <input type="password" name="password"size="16"/>                       
                <br><br>                  
                <br><br>            
                    <input type="submit" value="登录"/>
                    <input type="button" value="注册" onclick="location.href='register.jsp'" />     
    </p>
    </form>  

</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>修改</title>
</head>
    <form id="1" action ="modifyback.jsp" method="get">   
   <p style="text-align:center;color:black;font-family:楷体; font-size:20px">    
                <br>
                账号:             
                    <input type="text" name="number"size="15"/>
                <br><br>
                成绩:             
                    <input type="text" name="achievement"size="15"/>
                <br><br>                                                                
                <br><br>            
                    <input type="submit" value="修改"/>
                <br><br>            
                    <input type="button" value="返回上一页" onclick="javascript:history.back(-1)" />      
    </p>
    </form>  

</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>处理</title>
</head>
<body>
<jsp:useBean id="util" class="a.A" scope="page" />
<% 
  String number=(String)request.getParameter("number");
  String achievement=(String)request.getParameter("achievement");
  if(util.queryEmpty(number)||util.queryEmpty(achievement)){
	  out.print("<script language ='javaScript'> alert('输入不能为空');window.history.back(-1); </script>");
  }else if(!util.judgeS(number)){
	  out.print("<script language ='javaScript'> alert('学号不存在');window.history.back(-1); </script>");
  }else if(util.numberInt(achievement)){
	  out.print("<script language ='javaScript'> alert('成绩输入不规范');window.history.back(-1); </script>");
  }else{
	  util.modify(achievement, number);
	  out.print("<script language='javaScript'> alert('修改成功');</script>");
		response.setHeader("refresh", "0;url=teacher.jsp");   
  }
%>
</body>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>登录系统</title>
</head>
    <form id="1" action ="queryback.jsp" method="get">   
   <p style="text-align:center;color:black;font-family:楷体; font-size:20px">    
                <br>
                学号或姓名:             
                    <input type="text" name="A"size="15"/>                                
                <br><br>                  
                <br><br>            
                    <input type="submit" value="查询"/>
                <br><br>            
                    <input type="button" value="返回上一页" onclick="javascript:history.back(-1)" />  
     
    </p>
    </form>  

</html>

　　

<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head>
<title>查询</title>
</head>
<body>
<jsp:useBean id="util" class="a.A"/>
<table border="1"style="text-align:center">
<caption>成绩</caption>
<tr>
<td align="center" width=3%>学号</td>
<td align="center" width=3%>姓名</td>
<td align="center" width=3%>班级</td>
<td align="center" width=3%>学科</td>
<td align="center" width=3%>成绩</td>
</tr>
<%
String A=(String)request.getParameter("A");
try{
	Connection connect = util.database();
	PreparedStatement preparedStatement=null; 
	ResultSet rs = null;
	preparedStatement=connect.prepareStatement("select * from achievement where number like ? or name like ?");
	preparedStatement.setString(1,"%"+A+"%");
    preparedStatement.setString(2,"%"+A+"%");
    rs=preparedStatement.executeQuery();
    while(rs.next()){
		   %>
		   <tr>
		   <td width=3% align="center"><%=rs.getObject(1) %></td>
		   <td width=3% align="center"><%=rs.getObject(2) %></td>	
		   <td width=3% align="center"><%=rs.getObject(3) %></td>
		   <td width=3% align="center"><%=rs.getObject(4) %></td>	
		   <td width=3% align="center"><%=rs.getObject(5) %></td>	   
		   </tr>
		   <%
    }
    rs.close();
    preparedStatement.close();
    connect.close();
}catch (SQLException e) {
    e.printStackTrace();            
}
%>
</table>
<p style="text-align:center;color:black;font-family:宋体; font-size:20px">
            <br>             
            <input type="button" value="返回上一页" onclick="javascript:history.back(-1)" /> 
    </p>  
</body>
</html>

　　

<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head>
<title>排序</title>
</head>
<body>
<jsp:useBean id="util" class="a.A"/>
<table border="1"style="text-align:center">
<caption>成绩</caption>
<tr>
<td align="center" width=3%>学号</td>
<td align="center" width=3%>姓名</td>
<td align="center" width=3%>班级</td>
<td align="center" width=3%>学科</td>
<td align="center" width=3%>成绩</td>
</tr>
<%
try{
	Connection connect = util.database();
    Statement stmt = connect.createStatement();
    ResultSet rs = stmt.executeQuery("select *from achievement order by achievement desc");
    while(rs.next()){	
    	%>
    	   <tr>
		   <td width=3% align="center"><%=rs.getObject(1) %></td>
		   <td width=3% align="center"><%=rs.getObject(2) %></td>	
		   <td width=3% align="center"><%=rs.getObject(3) %></td>
		   <td width=3% align="center"><%=rs.getObject(4) %></td>	
		   <td width=3% align="center"><%=rs.getObject(5) %></td>	   
		   </tr>
		<%
    }
    rs.close();           
    stmt.close();
    connect.close();
}catch (SQLException e) {
    e.printStackTrace();            
}
%>
</table>
<p style="text-align:center;color:black;font-family:宋体; font-size:20px">
            <br>             
            <input type="button" value="返回上一页" onclick="javascript:history.back(-1)" /> 
    </p>  
</body>
</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>注册系统</title>
</head>
    <form id="1" action ="register-back.jsp" method="get">   
   <p style="text-align:center;color:black;font-family:楷体; font-size:20px">    
                <br>
                账号:             
                    <input type="text" name="number"size="15"/>
                <br><br>                
                密码:               
                    <input type="password" name="password"size="16"/>                       
                <br><br>                  
                <br><br>            
                    <input type="submit" value="注册"/>
                <br><br>
                    <input type="button" value="返回上一页" onclick="javascript:history.back(-1)" />  
    </p>
    </form>  

</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>注册处理</title>
</head>
<body>
<jsp:useBean id="util" class="a.A" scope="page" />
<% 
  String number=(String)request.getParameter("number");
  String password=(String)request.getParameter("password");
  if(util.queryEmpty(number)||util.queryEmpty(password)){
	  out.print("<script language ='javaScript'> alert('输入不能为空');window.history.back(-1); </script>");
  }else if(!util.judge(number)){
	  out.print("<script language ='javaScript'> alert('账号已存在');window.history.back(-1); </script>");
  }else{
	  util.addT(number, password);
	  out.print("<script language='javaScript'> alert('注册成功');</script>");
		response.setHeader("refresh", "0;url=index.jsp");   
  }
%>
</body>
</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>登录处理</title>
</head>
<body>
<jsp:useBean id="util" class="a.A" scope="page" />
<% 
  String number=(String)request.getParameter("number");
  String password=(String)request.getParameter("password");
  if(util.queryEmpty(number)||util.queryEmpty(password)){
	  out.print("<script language ='javaScript'> alert('输入不能为空');window.history.back(-1); </script>");
  }else if(util.judge(number)){
	  out.print("<script language ='javaScript'> alert('未查询到改账号');window.history.back(-1); </script>");
  }else if(util.judgepassword(number, password)){
	  out.print("<script language ='javaScript'> alert('密码错误');window.history.back(-1); </script>");
  }else{
	  out.print("<script language='javaScript'> alert('登录成功');</script>");
		response.setHeader("refresh", "0;url=teacher.jsp");   
  }
%>
</body>
</html>

　　

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>登录系统</title>
</head>
	<p style="text-align:center;color:black;font-family:宋体,serif; font-size:20px">
	<br><br>
	<input type="button" value="增加学生" onclick="location.href='addS.jsp'" /> 
	<br><br>
	<input type="button" value="删除学生" onclick="location.href='delS.jsp'" />
	<br><br>
	<input type="button" value="修改成绩" onclick="location.href='modify.jsp'" />
	<br><br>
	<input type="button" value="查询成绩" onclick="location.href='query.jsp'" />
	<br><br>
	<input type="button" value="成绩排名" onclick="location.href='ranking.jsp'" />
	<br><br>
    </p>	
</html>