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学生管理系统(springMVC)

《Java Web编程》课程设计

学生管理系统

完成日期： 2018年12月26日

1 项目引言

1.1 项目简介

学生入校后，我们需要管理这些学生，那么就需要我们对这些学生进行很多的操作，此时我们学校对学生有条理的管理，包括一些基本信息的记录，就方便了学生的信息管理。

1.2 使用技术

这是一个学生管理系统，应用的是SSH框架Spring+SpringMVC+Hibernate的项目，

运用的知识：

spring，springmvc，hibernate，Oracle

- 基本数据库知识Oracle
- Spring+SpringMVC+Hibernate
- （重点）框架的MVC设计模式的应用
- 部分前端代码（CSS和JavaScript的应用）

1.3 开发环境

操作系统：Win10系统

开发语言：JavaEE，JavaWeb。

开发工具：MyEclipse Professional 2014, navicat

2 需求分析

1）功能介绍：

- 增删改查学生。（test测试类中实现以及在jsp页面实现修改和删除）
- 增删改查页面显示当前学生信息（session里获取）
- 页面时间自动更新功能
- 部分前端代码

(3)项目构建

项目分包：MVC架构

controller:控制层，写SpringMvc的action

dao：数据层，Hibernate对数据的操作

entity：实体类和相应的*.hbm.xml(hibernate的类配置文件)

servicesDao：业务Dao，对单笔Dao进行业务封装

utils：工具类

3 概要设计

3.1 功能模块图

增删改查学生

增删改查页面显示当前用户信息（session里获取）

时间更新

- 部分前端代码

如图3-1所示：

实现页面显示：

注册页面

登录页面：

系统主页面：

1 系统实现

思路：

实现源码：

 1 package entity;
 2 
 3 import java.io.Serializable;
 4 //实现序列化接口
 5 //实体类
 6 public class Student implements Serializable{
 7     //要与表中字段一一对应
 8     private Integer id;
 9     private String name;
10     private String password;
11     private String truename;
12     private String sex;
13     public Integer getId() {
14         return id;
15     }
16     public void setId(Integer id) {
17         this.id = id;
18     }
19     public String getName() {
20         return name;
21     }
22     public void setName(String name) {
23         this.name = name;
24     }
25     public String getPassword() {
26         return password;
27     }
28     public void setPassword(String password) {
29         this.password = password;
30     }
31     public String getTruename() {
32         return truename;
33     }
34     public void setTruename(String truename) {
35         this.truename = truename;
36     }
37     public String getSex() {
38         return sex;
39     }
40     public void setSex(String sex) {
41         this.sex = sex;
42     }
43     @Override
44     public String toString() {
45         return "Student [id=" + id + ", name=" + name + ", password="
46                 + password + ", truename=" + truename + ", sex=" + sex + "]";
47     }
48     public Student(Integer id, String name, String password, String truename,
49             String sex) {
50         super();
51         this.id = id;
52         this.name = name;
53         this.password = password;
54         this.truename = truename;
55         this.sex = sex;
56     }
57     public Student() {
58         super();
59     }
60     
61     
62 }

 1 package dao;
 2 
 3 import java.sql.Date;
 4 import java.util.List;
 5 
 6 import entity.Student;
 7 // DAO层
 8 public interface StudentDAO {
 9     //添加一条数据到数据库中
10     public void insert (Student stu);
11     //查询所有数据
12     public List<Student> queryall();
13     //查询单条数据
14     public Student query(String name);
15     //删除单条数据
16     public void delete(Integer id);
17     //修改一条数据
18     public void update(Student stu);
19     //查询单条数据
20     public Student queryone(Integer id);
21     //展示日期
22     public Date date();
23 }

Mapper:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 3 <mapper namespace="dao.StudentDAO">
 4       <insert id="insert" parameterType="student">
 5       <selectKey order="BEFORE" resultType="int" keyProperty="id">
 6           select student_sql.nextval from dual
 7       </selectKey>
 8           insert into student values(#{id},#{name},#{password},#{truename},#{sex})
 9       </insert>
10       <select id="queryall" resultType="student">
11           select * from student
12       </select>
13       <!-- 查询单挑数据 -->
14     <select id="query" resultType="student">
15         select * from student where name=#{name}
16     </select>
17     <delete id="delete" parameterType="java.lang.Integer">
18         delete from student where id=#{id}
19     </delete>
20     <!-- 修改一条数据 -->
21     <update id="update" parameterType="student">
22         update student set name=#{name},password=#{password},truename=#{truename},sex=#{sex} where id=#{id}
23     </update>
24     <!-- 查询单个对象 -->
25     <select id="queryone" resultType="student" parameterType="java.lang.Integer">
26         select * from student where id=#{id}
27     </select>
28     <select id="date" resultType="java.sql.Date">
29         select sysdate from dual
30     </select>
31 </mapper>

Service:

 1 package service;
 2 
 3 import java.util.List;
 4 
 5 import entity.Student;
 6 
 7 public interface StudentService {
 8     //注册账户
 9     public void regester(Student stu);
10     //展示所有数据
11     public List<Student> showall();
12     //登录用户
13     public Student login(String name);
14     //删除一个用户
15     public void delete(Integer id);
16     //修改数据
17     public void update(Student stu);
18     //查询单条数据
19     public Student query(Integer id);
20     //查询日期
21     public String found();
22 }

Serviceimpl:

 1 package service;
 2 
 3 import java.text.SimpleDateFormat;
 4 import java.util.List;
 5 
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.stereotype.Service;
 8 import org.springframework.transaction.annotation.Transactional;
 9 
10 import dao.StudentDAO;
11 import entity.Student;
12 
13 @Service
14 //为原始类对象添加事务（额外功能）
15 @Transactional
16 public class StudentServiceimpl implements StudentService{
17     /*
18      * 原始类对象：原始方法，调用dao和编写逻辑代码
19      * */
20     //将DAO接口定义成这个类中的成员变量
21     @Autowired
22     private StudentDAO dao;
23 
24     public StudentDAO getDao() {
25         return dao;
26     }
27     //注册一条数据
28     public void setDao(StudentDAO dao) {
29         this.dao = dao;
30     }
31     
32     public void regester(Student stu){
33         System.out.println(stu);
34         dao.insert(stu);
35     }
36     
37     //展示所有数据
38     public List<Student> showall(){
39         List<Student> list = dao.queryall();
40         return list;
41     }
42     
43     //注册方法
44     public Student login(String name){
45         Student s = dao.query(name);
46         return s;
47     }
48     
49     //删除一条数据
50     public void delete(Integer id){
51         dao.delete(id);
52     }
53     
54     //修改一条数据
55     public void update(Student stu){
56         dao.update(stu);
57     }
58     
59     //查询一条数据
60     public Student query(Integer id){
61         Student s = dao.queryone(id);
62         return s;
63     }
64     
65     //展示日期
66     public String found(){
67         java.sql.Date date = dao.date();
68         //转换成为java date
69         java.util.Date da = new java.util.Date(date.getTime());
70         SimpleDateFormat Format = new SimpleDateFormat("yyyy-MM-dd");
71         String s = Format.format(da);
72         return s;
73     }
74 }

Controller层

Student:

  1 package action;
  2 
  3 import java.util.List;
  4 
  5 import javax.servlet.http.HttpServletRequest;
  6 
  7 import org.springframework.beans.factory.annotation.Autowired;
  8 import org.springframework.stereotype.Controller;
  9 import org.springframework.web.bind.annotation.RequestMapping;
 10 
 11 import entity.Student;
 12 import service.StudentService;
 13 
 14 //添加@Controller注解指定这个类对象是我们的控制器
 15 @Controller
 16 //为控制器添加url访问路径名称
 17 @RequestMapping("/student")
 18 public class StudentController {
 19     /*
 20      * 1.收集数据  2.调用service层方法 3.流程跳转
 21      */
 22     @Autowired
 23     private StudentService service;
 24 
 25     public StudentService getService() {
 26         return service;
 27     }
 28 
 29     public void setService(StudentService service) {
 30         this.service = service;
 31     }
 32     
 33     @RequestMapping("/add")
 34     public String add(Student stu){
 35         System.out.println("---------------------------");
 36         System.out.println(stu);
 37         System.out.println(service);
 38         service.regester(stu);
 39         System.out.println("---------------------------");
 40         return "login";
 41     }
 42     
 43     //展示所有数据到jsp页面上
 44     @RequestMapping("/show")
 45     public String show(HttpServletRequest request){
 46         System.out.println("-----------------------------");
 47         List<Student> list = service.showall();
 48         request.setAttribute("list", list);
 49         System.out.println("-----sfhfgthftg--------------------------");
 50         return "emplist";
 51     }
 52     
 53     //登录控制器
 54     @RequestMapping("/login")
 55     public String login(Student stu,HttpServletRequest request,String code) {
 56         System.out.println("--------------------------");
 57         //通过页面传来的name 去数据库中查询一个对象返回
 58         Student student = service.login(stu.getName());
 59         //存入一个标记到作用域中,作为强制登录的判断条件
 60         request.getSession().setAttribute("key",student);
 61         // 判断student对象是否为空
 62         if (student != null) {
 63             if(request.getSession().getAttribute("code").equals(code)){
 64             if (student.getPassword().equals(stu.getPassword())) {
 65                 System.out.println("_---------------登录成功");
 66                 return "forward:/student/show.do";
 67             } else {
 68                 System.out.println("密码错误-----------------");
 69                 return "login";
 70             }
 71             }else{
 72                 System.out.println("验证码错误====================");
 73                 return "login";
 74             }
 75         } else {
 76             System.out.println("============================用户不存在");
 77             return "register";
 78         }
 79 
 80     }
 81 
 82     // 删除一条数据
 83     @RequestMapping("/delete")
 84     public String delete(int id,HttpServletRequest request){
 85         if(request.getSession().getAttribute("key")!=null){
 86         service.delete(id);
 87         return "forward:/student/show.do";}else{
 88             return "login";
 89         }
 90     }
 91     
 92     //修改一条数据
 93     @RequestMapping("/update")
 94     public String update(Student stu){
 95         service.update(stu);
 96         return "forward:/student/show.do";
 97     }
 98     //查询单个对象，并存入作用域跳转到修改页面
 99     @RequestMapping("/select")
100     public String select(HttpServletRequest request){
101         String i = request.getParameter("id");
102         //字符串转换int 
103         int id = Integer.parseInt(i);
104         Student student = service.query(id);
105         request.setAttribute("student",student);
106         return "updateEmp";
107     }
108 }

Code:

 1 package action;
 2 
 3 import java.awt.image.BufferedImage;
 4 import java.io.IOException;
 5 import java.io.PrintWriter;
 6 
 7 import javax.imageio.ImageIO;
 8 import javax.imageio.stream.ImageOutputStream;
 9 import javax.servlet.ServletOutputStream;
10 import javax.servlet.http.HttpServletResponse;
11 import javax.servlet.http.HttpSession;
12 
13 import org.springframework.stereotype.Controller;
14 import org.springframework.web.bind.annotation.RequestMapping;
15 
16 import util.SecurityCode;
17 import util.SecurityImage;
18 
19 //添加注解使这个类对象成为控制器
20 @Controller
21 @RequestMapping("/code")
22 public class CodeController {
23     //固定public String
24     @RequestMapping("/code")
25     public void img(HttpServletResponse response, HttpSession session) throws IOException {
26         // 获得验证码字符串
27         String cool = SecurityCode.getSecurityCode();
28         // 将验证码字符串存入到session作用域中,目的是为了判断时有条件可依
29         session.setAttribute("code", cool);
30         // 将验证码字符串组装拼接成验证码图片
31         BufferedImage image = SecurityImage.createImage(cool);
32         // 响应到客户端
33         ServletOutputStream out = response.getOutputStream();
34         // 打印输出验证码到页面中
35         ImageIO.write(image, "png", out);
36     }
37 }

Util

securityCode:

 1 package util;
 2 
 3 import java.util.Arrays;
 4 
 5 /**
 6  * 
 7  * @author others
 8  * date:2014-8-26  下午2:17:19
 9  * 描述：随机生成验证码值：验证码串
10  */
11 public class SecurityCode {
12     /**
13      * 验证码难度级别
14      *   Simple-数字
15      *   Medium-数字和小写字母 
16      *   Hard-数字和大小写字母
17      */
18     public enum SecurityCodeLevel {
19         Simple, Medium, Hard
20     };
21     /**
22      * 产生默认验证码，4位中等难度
23      *
24      * @return
25      */
26     public static String getSecurityCode() {
27         return getSecurityCode(3, SecurityCodeLevel.Medium, false);
28     }
29     /**
30      * 产生长度和难度任意的验证码
31      *
32      * @param length
33      * @param level
34      * @param isCanRepeat
35      * @return
36      */
37     private static String getSecurityCode(int length, SecurityCodeLevel level, boolean isCanRepeat) {
38         // 随机抽取len个字符
39         int len = length;
40         // 字符集合（--除去易混淆的数字0,1,字母l,o,O）
41         char[] codes = {
42                  '2', '3', '4', '5', '6', '7', '8', '9',
43                 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
44                 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',  'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
45         };
46         // 根据不同难度截取字符串
47         if (level == SecurityCodeLevel.Simple) {
48             codes = Arrays.copyOfRange(codes, 0, 10);
49         } else if (level == SecurityCodeLevel.Medium) {
50             codes = Arrays.copyOfRange(codes, 0, 36);
51         }
52         // 字符集和长度
53         int n = codes.length;
54         // 抛出运行时异常
55         if (len > n && isCanRepeat == false) {
56             throw new RuntimeException(String.format("调用SecurityCode.getSecurityCode(%1$s,%2$s,%3$s)出现异常，" + "当isCanRepeat为%3$s时，传入参数%1$s不能大于%4$s", len, level, isCanRepeat, n));
57         }
58         // 存放抽取出来的字符
59         char[] result = new char[len];
60         // 判断能否出现重复字符
61         if (isCanRepeat) {
62             for (int i = 0; i < result.length; i++) {
63                 // 索引0 and n-1
64                 int r = (int) (Math.random() * n);
65                 // 将result中的第i个元素设置为code[r]存放的数值
66                 result[i] = codes[r];
67             }
68         } else {
69             for (int i = 0; i < result.length; i++) {
70                 // 索引0 and n-1
71                 int r = (int) (Math.random() * n);
72                 // 将result中的第i个元素设置为code[r]存放的数值
73                 result[i] = codes[r];
74                 // 必须确保不会再次抽取到那个字符，这里用数组中最后一个字符改写code[r],并将n-1
75                 codes[r] = codes[n - 1];
76                 n--;
77             }
78         }
79         return String.valueOf(result);
80     }
81     public static void main(String[] args) {
82         System.out.println(SecurityCode.getSecurityCode());
83     }
84 }

securityImage:

 1 package util;
 2 
 3 import java.awt.Color;
 4 import java.awt.Font;
 5 import java.awt.Graphics2D;
 6 import java.awt.image.BufferedImage;
 7 import java.util.Random;
 8 
 9 public class SecurityImage {
10     /**
11      * 生成验证码图片
12      * 
13      * @param securityCode
14      * 
15      * @return
16      * 
17      */
18     public static BufferedImage createImage(String securityCode) {
19 
20         int codeLength = securityCode.length();// 验证码长度
21 
22         int fontSize = 30;// 字体大小
23 
24         int fontWidth = fontSize + 1;
25 
26         // 图片宽高
27 
28         int width = codeLength * fontWidth + 4;
29 
30         int height = fontSize * 1 + 1;
31 
32         // 图片
33 
34         BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
35 
36         Graphics2D g = image.createGraphics();
37 
38         g.setColor(Color.WHITE);// 设置背景色
39 
40         g.fillRect(0, 0, width, height);// 填充背景
41 
42         g.setColor(Color.LIGHT_GRAY);// 设置边框颜色
43 
44         g.setFont(new Font("Arial", Font.BOLD, height - 2));// 边框字体样式
45 
46         g.drawRect(0, 0, width - 1, height - 1);// 绘制边框
47 
48         // 绘制噪点
49 
50         Random rand = new Random();
51 
52         g.setColor(Color.LIGHT_GRAY);
53 
54         for (int i = 0; i < codeLength * 6; i++) {
55 
56             int x = rand.nextInt(width);
57 
58             int y = rand.nextInt(height);
59 
60             g.drawRect(x, y, 1, 1);// 绘制1*1大小的矩形
61 
62         }
63 
64         // 绘制验证码
65 
66         int codeY = height - 10;
67 
68         g.setColor(new Color(19, 148, 246));
69 
70         g.setFont(new Font("Georgia", Font.BOLD, fontSize));
71         for (int i = 0; i < codeLength; i++) {
72             double deg = new Random().nextDouble() * 20;
73             g.rotate(Math.toRadians(deg), i * 16 + 13, codeY - 7.5);
74             g.drawString(String.valueOf(securityCode.charAt(i)), i * 16 + 5, codeY);
75             g.rotate(Math.toRadians(-deg), i * 16 + 13, codeY - 7.5);
76         }
77 
78         g.dispose();// 关闭资源
79 
80         return image;
81 
82     }
83 
84 }

Test：

 1 package test;
 2 
 3 import java.util.List;
 4 
 5 import org.junit.Test;
 6 import org.springframework.context.ApplicationContext;
 7 import org.springframework.context.support.ClassPathXmlApplicationContext;
 8 
 9 import service.StudentService;
10 import dao.StudentDAO;
11 import entity.Student;
12 
13 public class StudentTest {
14     @Test
15     public void test(){
16         ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
17         //通过接口名首字母小写作为beanid拿到的就是接口的实现类对象
18         StudentDAO dao = (StudentDAO)ctx.getBean("studentDAO");
19         //dao.insert(new Student(10,"张明明","zmm","张明明","男"));
20         /*Student s = new Student();
21         s.setId(11);
22         s.setName("樊小明");
23         s.setPassword("fxm");
24         dao.insert(s);*/
25         /*List<Student> list = dao.queryall();
26         for(Student student : list){
27             System.out.println(student);
28         }*/
29         //Student s = dao.query("张玉贤");
30         //System.out.println(s);
31         //dao.delete(17);
32         dao.update(new Student(1,"贾克斯","jks","jia","男"));
33         //Student s = dao.queryone(8);
34         //System.out.println(s);
35         
36     }
37     @Test
38     public void test2(){
39         ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
40         StudentService s = (StudentService)ctx.getBean("studentServiceimpl");
41         //s.regester(new Student(15,"金克斯","jks"));
42         /*List<Student> list = s.showall();
43          for(Student student : list){
44          System.out.println(student);
45         }*/
46         //s.update(new Student(19,"老司机","lsj"));
47         //String ss = s.found();
48         //System.out.println(ss);
49         
50         
51     }
52 }

jsp

Register:

 1 <%@page pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 3 <c:set var="baseurl" value="${pageContext.request.contextPath}"></c:set>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <title>regist</title>
 8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 9 <link rel="stylesheet" type="text/css" href="${baseurl}/css/style.css" />
10 </head>
11 <body>
12     <div id="wrap">
13         <div id="top_content">
14             <div id="header">
15                 <div id="rightheader">
16                     <p>
17                         <script type="text/javascript">
18                               var date=new Date();   
19         //toLocaleString()   获取本地时间格式的方法
20         document.write(date.toLocaleString());
21         document.write("<hr size='3' color='blue'>");
22                         </script><br />
23                     </p>
24                 </div>
25                 <div id="topheader">
26                     <h1 id="title">
27                         <a href="#">main</a>
28                     </h1>
29                 </div>
30                 <div id="navigation"></div>
31             </div>
32             <div id="content">
33                 <p id="whereami"></p>
34                 <h1>注册</h1>
35                 <form action="${pageContext.request.contextPath}/student/add.do"
36                     method="post">
37                     <table cellpadding="0" cellspacing="0" border="0"
38                         class="form_table">
39                         <tr>
40                             <td valign="middle" align="right">用户名:</td>
41                             <td valign="middle" align="left"><input type="text"
42                                 class="inputgri" name="name" /></td>
43                         </tr>
44                         <tr>
45                             <td valign="middle" align="right">真实姓名:</td>
46                             <td valign="middle" align="left"><input type="text"
47                                 class="inputgri" name="truename" /></td>
48                         </tr>
49                         <tr>
50                             <td valign="middle" align="right">密码:</td>
51                             <td valign="middle" align="left"><input type="password"
52                                 class="inputgri" name="password" /></td>
53                         </tr>
54                         <tr>
55                             <td valign="middle" align="right">性别:</td>
56                             <td valign="middle" align="left">男 <input type="radio"
57                                 class="inputgri" name="sex" value="男" checked="checked" /> 女 <input
58                                 type="radio" class="inputgri" name="sex" value="女" />
59                             </td>
60                         </tr>
61 
62                     </table>
63                     <p>
64                         <input type="submit" class="button" value="Submit &raquo;" />
65                     </p>
66                 </form>
67             </div>
68         </div>
69         <div id="footer">
70             <div id="footer_bg">ABC@126.com</div>
71         </div>
72     </div>
73 </body>
74 </html>

Login:

 1 <%@page pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 3 <c:set var="baseurl" value="${pageContext.request.contextPath}"></c:set>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <title>login</title>
 8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 9 <link rel="stylesheet" type="text/css" href="${baseurl}/css/style.css" />
10 </head>
11 
12 <body>
13     <div id="wrap">
14         <div id="top_content">
15             <div id="header">
16                 <div id="rightheader">
17                     <p>
18                         <script type="text/javascript">
19                               var date=new Date();   
20         //toLocaleString()   获取本地时间格式的方法
21         document.write(date.toLocaleString());
22         document.write("<hr size='3' color='blue'>");
23                         </script><br />
24                     </p>
25                 </div>
26                 <div id="topheader">
27                     <h1 id="title">
28                         <a href="#">main</a>
29                     </h1>
30                 </div>
31                 <div id="navigation"></div>
32             </div>
33             <div id="content">
34                 <p id="whereami"></p>
35                 <h1>login</h1>
36                 <form action="${pageContext.request.contextPath}/student/login.do"
37                     method="post">
38                     <table cellpadding="0" cellspacing="0" border="0"
39                         class="form_table">
40                         <tr>
41                             <td valign="middle" align="right">username:</td>
42                             <td valign="middle" align="left"><input type="text"
43                                 class="inputgri" name="name" /></td>
44                         </tr>
45                         <tr>
46                             <td valign="middle" align="right">password:</td>
47                             <td valign="middle" align="left"><input type="password"
48                                 class="inputgri" name="password" /></td>
49                         </tr>
50                         <tr>
51                             <td valign="middle" align="right">验证码:<img id="num" src="${pageContext.request.contextPath}/code/code.do" /></td>
52                             <td> <input type="text" name="code" /></td>
53                         </tr> 
54                     </table>
55                     <p align="left">
56                         <input type="submit" class="button" value="登陆 &raquo;"
57                             style="height: 26px; " />
58                     </p>
59                 </form>
60             </div>
61         </div>
62         <div id="footer">
63             <div id="footer_bg">ABC@126.com</div>
64         </div>
65     </div>
66 </body>
67 </html>

Update:

 1 <%@page pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 3 <c:set var="baseurl" value="${pageContext.request.contextPath}"></c:set>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <title>update Emp</title>
 8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 9 <link rel="stylesheet" type="text/css" href="${baseurl}/css/style.css" />
10 </head>
11 
12 <body>
13     <div id="wrap">
14         <div id="top_content">
15             <div id="header">
16                 <div id="rightheader">
17                     <p>
18                         <script type="text/javascript">
19                               var date=new Date();   
20         //toLocaleString()   获取本地时间格式的方法
21         document.write(date.toLocaleString());
22         document.write("<hr size='3' color='blue'>");
23                         </script><br />
24                     </p>
25                 </div>
26                 <div id="topheader">
27                     <h1 id="title">
28                         <a href="#">Main</a>
29                     </h1>
30                 </div>
31                 <div id="navigation"></div>
32             </div>
33             <div id="content">
34                 <p id="whereami"></p>
35                 <h1>updateEmp info:</h1>
36                 <form action="${pageContext.request.contextPath}/student/update.do"
37                     method="post">
38                     <table cellpadding="0" cellspacing="0" border="0"
39                         class="form_table">
40                         <tr>
41                             <td valign="middle" align="right">id:</td>
42                             <td valign="middle" align="left"><input type="text"
43                                 class="inputgri" name="id" value="${requestScope.student.id}" readonly="readonly"/></td>
44                         </tr>
45                         <tr>
46                             <td valign="middle" align="right">name:</td>
47                             <td valign="middle" align="left"><input type="text"
48                                 class="inputgri" name="name" value="${requestScope.student.name}" /></td>
49                         </tr>
50                         <tr>
51                             <td valign="middle" align="right">truename:</td>
52                             <td valign="middle" align="left"><input type="text"
53                                 class="inputgri" name="truename"
54                                 value="${requestScope.student.truename}" /></td>
55                         </tr>
56                         <tr>
57                             <td valign="middle" align="right">password:</td>
58                             <td valign="middle" align="left"><input type="text"
59                                 class="inputgri" name="password"
60                                 value="${requestScope.student.password}" /></td>
61                         </tr>
62                         <tr>
63                             <td valign="middle" align="right">sex:</td>
64                             <td valign="middle" align="left"><input type="text"
65                                 class="inputgri" name="sex" value="${requestScope.student.sex}" /></td>
66                         </tr>
67                     </table>
68                     <p>
69                         <input type="submit" class="button" value="修改" />
70                     </p>
71                 </form>
72             </div>
73         </div>
74         <div id="footer">
75             <div id="footer_bg">ABC@126.com</div>
76         </div>
77     </div>
78 </body>
79 </html>

Emplist:

 1 <%@page pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 3 <c:set var="baseurl" value="${pageContext.request.contextPath}"></c:set>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <title>emplist</title>
 8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 9 <link rel="stylesheet" type="text/css" href="${baseurl}/css/style.css" />
10 </head>
11 <body>
12     <div id="wrap">
13         <div id="top_content">
14             <div id="header">
15                 <div id="rightheader">
16                     <p>
17                         <script type="text/javascript">
18                               var date=new Date();   
19         //toLocaleString()   获取本地时间格式的方法
20         document.write(date.toLocaleString());
21         document.write("<hr size='3' color='blue'>");
22                         </script><br />
23                     </p>
24                 </div>
25                 <div id="topheader">
26                     <h1 id="title">
27                         <a href="#">main</a>
28                     </h1>
29                 </div>
30                 <div id="navigation"></div>
31             </div>
32             <div id="content">
33                 <p id="whereami"></p>
34                 <h1>Welcome!</h1>
35             <h1>尊敬的用户:${sessionScope.key.name}</h1> 
36                 <table class="table">
37                     <tr class="table_header">
38                         <td>ID</td>
39                         <td>Name</td>
40                         <td>Password</td>
41                         <td>Truename</td>
42                         <td>Sex</td>
43                         <td>Operation</td>
44                     </tr>
45                     
46             <c:forEach var="student" items="${list}">
47             <tr>
48                 <td>${student.id}</td>
49                 <td>${student.name}</td>
50                 <td>${student.password}</td>
51                 <td>${student.truename}</td>
52                 <td>${student.sex}</td>
53                 <td>
54                 <a href="${pageContext.request.contextPath}/student/delete.do?id=${student.id}">删除</a>&nbsp;&nbsp;
55                 <a href="${pageContext.request.contextPath}/student/select.do?id=${student.id}">修改</a>
56                 </td>
57             </tr>
58         </c:forEach>
59                         
60                         
61                 </table>
62             </div>
63         </div>
64         <div id="footer">
65             <div id="footer_bg">ABC@126.com</div>
66         </div>
67     </div>
68 </body>
69 </html>

结束语：

刚开始接触这个课题时，感觉很多问题接踵而至，不知所措，但是，在自己的努力和别人的帮助下下，还是成功了，心里很开心，很充实。这个课题研究的意义是,对数据库进行增删改查操作，这个课题给我带来了很大的收获。我在当中也学到了很多精神，刻苦奋斗，锲而不舍。人生不会再有第二个大学，我很珍惜在大学里的一切，也很怀念这一切。活在当下，珍惜当下，充实当下。

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原文地址：https://www.cnblogs.com/zyx110/p/10617626.html