源代码以及执行结果截图：
admoinStudent.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@page import="java.sql.*"%>
<%@ page import="javax.sql.DataSource" %>
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.naming.InitialContext" %>
<style>
#tom{
font-family:宋体;font-size:28;color:black
}
</style>
<% request.setCharacterEncoding("utf-8");
Connection con=null;
PreparedStatement pre=null;
ResultSet rs;
Context context =new InitialContext();
Context contextNeeded=(Context)context.lookup("java:comp/env");//环境命名上下文
DataSource ds=
(DataSource)contextNeeded.lookup("StudentConn");
con = ds.getConnection();
String updateSQL =
"update scoreReport set name =?,mathScore=?,englishScore=? where id=?";
String insertSQL ="insert into scoreReport values(?,?,?,?)";
String deleteSQL ="delete from scoreReport where id =?";
String querySQL = "select * from scoreReport where id =?";
String mess = request.getParameter("submit");
if(mess == null) mess ="";
String id = request.getParameter("id");
String name = request.getParameter("name");
String math = request.getParameter("mathScore");
String english = request.getParameter("englishScore");
try{
if(mess.contains("查看")){
pre = con.prepareStatement(querySQL);
pre.setString(1,id);
rs = pre.executeQuery();
if(rs.next()){
id = rs.getString(1);
name = rs.getString(2);
math = rs.getString(3);
english = rs.getString(4);
}
}
else if(mess.contains("更新")){
pre = con.prepareStatement(updateSQL);
pre.setString(1,name);
pre.setInt(2,Integer.parseInt(math));
pre.setInt(3,Integer.parseInt(english));
pre.setString(4,id);
pre.executeUpdate();
out.print("<h3>更新成功</h3>");
}
else if(mess.contains("添加")){
pre = con.prepareStatement(insertSQL);
pre.setString(1,id);
pre.setString(2,name);
pre.setInt(3,Integer.parseInt(math));
pre.setInt(4,Integer.parseInt(english));
pre.executeUpdate();
out.print("<h3>添加成功</h3>");
}
else if(mess.contains("删除")){
pre = con.prepareStatement(deleteSQL);
pre.setString(1,id);
pre.executeUpdate();
out.print("<h3>删除成功</h3>");
}
}
catch(SQLException e) {
out.print("<h1>学号不能重复");
try{
con.close();
}
catch(SQLException exp){}
}
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body bgcolor = #ffccff>
<form action="" id=tom method=post >
输入学号查看或删除（信息）：<br>
<input type="text" id=tom name="id" size=10 /><br>
<input type="submit" id=tom name="submit" value="查看"/>
<input type="submit" id=tom name="submit" value="删除"/>
</form>
<form action="" id=tom method=post>
更新（或添加）
<input type="text" id=tom name="id" value =<%=id%> size=9 />
学号的信息：
<br>姓名:
<input type="text" id=tom name="name" value ='<%=name%>'size=11/>
<br>数学成绩:
<input type="text" id=tom name="mathScore" value ='<%=math%>'size=7 />
<br>英语成绩:
<input type="text" id=tom name="englishScore" value ='<%=english%>'size=7/>
<br><input type="submit" id=tom name="submit" value="更新"/>
<input type="submit" id=tom name="submit" value="添加"/>
</form>
</body>
</html>
context.xml
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource
name="StudentConn"
type="javax.sql.DataSource"
driverClassName="com.mysql.cj.jdbc.Driver"
url="jdbc:mysql://127.0.0.1:3306/stdent?
serverTimezone=CST&characterEncoding=utf8"
username ="root"
password ="root"
maxActive ="5"
maxIdle ="5"
minIdle ="1"
maxWait ="5000"
/>
</Context>
效果图
