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JavaWeb实现学生管理系统的超详细过程

作者：小菜鸟想逆袭

学生信息管理系统是针对学校人事处的大量业务处理工作而开发的管理软件,主要用于学校学生信息管理,下面这篇文章主要给大家介绍了关于JavaWeb实现学生管理系统的超详细过程,需要的朋友可以参考下

一、项目介绍

该项目是基于JavaWeb实现的学生管理系统，使用maven进行管理jar包，能够对学生信息进行增删改查，分页查询，以及实现管理员的注册、登录

二、项目结构

三、前期准备

1.配置maven环境，在pom.xml配置文件中配置项目所依赖的jar包

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.21</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>

2.在MySql数据库中，创建登录注册表login和学生信息表student

（1）登录注册表login

（2）学生信息表student

（3）创建数据表代码

SET NAMES utf-8;
CREATE DATABASE studentManager;
USE studentManager;
CREATE TABLE student
(
  sno INT PRIMARY KEY,
  sname VARCHAR(20) NOT NULL,
  sex CHAR(4) ,
  age INT DEFAULT 20,
  phone VARCHAR(30) 
);
INSERT INTO student VALUES(1001,'jack','男',23,'13389076524');
INSERT INTO student VALUES(1002,'rose','女',23,'18760987543');
INSERT INTO student VALUES(1003,'tom','男',23,'13389067823');
INSERT INTO student VALUES(1004,'王麻子','男',23,'13560738947');
INSERT INTO student VALUES(1005,'大麻子','男',23,'18899067532');
INSERT INTO student VALUES(1006,'小麻子','男',23,'15678634789');
INSERT INTO student VALUES(1007,'老麻子','男',23,'12199834572');
INSERT INTO student VALUES(1008,'张三','男',23,'15533098843');
INSERT INTO student VALUES(1009,'长萨珊','女',23,'12209835679');
INSERT INTO student VALUES(1010,'李四','女',23,'15509087635');
INSERT INTO student VALUES(1011,'王五','男',23,'15788679043');
INSERT INTO student VALUES(1012,'赵六','女',23,'12489034506');
INSERT INTO student VALUES(1013,'刘二','男',23,'13560596743');
CREATE TABLE login
(
  uid INT PRIMARY KEY,
  pwd VARCHAR(20) NOT NULL,
);
INSERT INTO login VALUES(1, '1234');
INSERT INTO login VALUES(2, '2222');
INSERT INTO login VALUES(3, '6688');

3.配置tocamt

四、代码实现

1.JSP界面实现

（1）首页-登录界面 (index.jsp)

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
    <title>学生信息管理平台</title>
    <style>
        .titleDiv{
            height: 85px;
            color:white;
            padding-top: 30px;
            font-size: 50px;
            padding-left: 30px;
            font-family: 隶书;
        }
        .mainDiv{
            width: 899px;
            height: 500px;
            border: 4px rgb(237, 237, 237) solid;
            border-radius: 5px;
            background-image: url("输入你要的图片链接！");
            margin: auto;
            margin-top: 50px;
        }
        .loginDiv{
            height: 220px;
            width: 260px;
            padding:50px;
            background-color:rgba(255,255,255,0.9);
            border-radius:25px;
            border:1px #bdbdbd solid;
            opacity:0.9;
            float: right;
            margin-right: 100px
        }
        .name{
            font-size: 25px;
        }
        a{
            font-size:15px;
            color:#59c2c5;
            padding-left:20px;
        }
        .item{
            height:60px;
        }
        .item input{
            line-height:40px;
            width:245px;
            border:none;
            border-bottom: 1px solid #59c2c5;
            margin-bottom: 20px;
            margin-top: 10px;
        }
        .login-btn{
            display:block;
            width:255px;
            height:50px;
            color:#fff;
            background:#59c2c5;
            font-size:16px;
            line-height:30px;
            text-align:center;
            border-radius:10px;
            border:none;
            margin-bottom: 20px;
            margin-top: 10px;
        }
    </style>
</head>
<body>
<div class="mainDiv">
    <div class="titleDiv">学生信息管理平台</div>
    <form action="LoginServlet" method="post">
    <div class="loginDiv">
        <div class="name">
            用户登录 <a href="register.jsp"> 立即注册</a>
        </div>
        <div class=item>
            <input type="text" name="uid" placeholder="用户名"/>
        </div>
        <div class=item>
            <input type="password" name="pwd" placeholder="密码"/>
        </div>
        <input type="submit" class="login-btn" value="登 录"/>
        <%
            if(session.getAttribute("loginErrorMessage") != null){
                String loginErrorMessage = (String)session.getAttribute("loginErrorMessage");
                out.print(loginErrorMessage);
            }
        %>
        <%
            String register = (String) request.getAttribute("register");
            if (register!= null) {
                if (register.equals("reg")) {
                    out.println("注册成功, 请登录！");
                }
            }
        %>
    </div>
    </form>
</div>
</body>
</html>

（2）用户注册界面 (register.jsp)

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
    <title>注册账号</title>

    <style>
        .mainDiv{
            width: 899px;
            height: 500px;
            border: 4px rgb(237, 237, 237) solid;
            border-radius: 5px;
            background-image: url("输入你要的图片链接！");
            margin: auto;
            margin-top: 50px;
        }


        .titleDiv{
            height: 85px;
            color:white;
            padding-top: 30px;
            font-size: 50px;
            padding-left: 30px;
            font-family: 隶书;
        }

        .registerDiv{
            height: 220px;
            width: 260px;
            padding:50px;
            background-color:rgba(255,255,255,0.9);
            border-radius:25px;
            border:1px #bdbdbd solid;
            opacity:0.9;
            float: right;
            margin-right: 100px
        }

        .name{
            font-size: 25px;
        }

        .item{
            height:60px;
        }

        .item input{
            line-height:40px;
            width:245px;
            border:none;
            border-bottom: 1px solid #59c2c5;
            margin-bottom: 20px;
            margin-top: 10px;
        }

        .btn{
            display:block;
            width:255px;
            height:50px;
            color:#fff;
            background:#59c2c5;
            font-size:16px;
            line-height:30px;
            text-align:center;
            border-radius:10px;
            border:none;
            margin-top: 10px;
        }

        a{
            font-size:18px;
            padding-left:200px;
            padding-bottom: 50px;
            color:#59c2c5;

        }


    </style>
</head>

</head>
<body>
<div class="mainDiv">
    <div class="titleDiv">学生信息管理平台</div>
    <form action = "RegisterServlet">
        <div class = "registerDiv">
            <div class = "name">用户注册</div>
            <div class = "item">
                <input type = "text" name = "uid" placeholder="账号"/>
            </div>
            <div class = "item">
                <input type = "password" name = "pwd"  placeholder="密码"/>
            </div>
            <input type = "submit" class = "btn" value = "注册"/>
            <a href = "index.jsp" >返回</a>

        </div>
    </form>
</div>
</body>
</html>

（3）登录成功-主界面 (main.jsp)

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ page import="com.stu.po.Student" %>
<!DOCTYPE html>
<html >
<head>
    <title>学生信息管理平台</title>

    <style>
        .titleDiv{
            height: 85px;
            color:white;
            padding-top: 30px;
            font-size: 50px;
            padding-left: 30px;
            font-family: 隶书;
        }

        .mainDiv{
            width: 899px;
            height: 500px;
            border: 4px rgb(237, 237, 237) solid;
            border-radius: 5px;
            background-image: url("https://img1.baidu.com/it/u=4271373647,1745018175&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500");
            margin: auto;
            margin-top: 50px;
            background-size: auto;
        }

        .Navigation{
            width: 899px;
            height: 200px;
            background-color:#59c2c5;
            opacity:0.8;
            text-align: center;
            line-height: 200px;
            font-family: 楷体;

        }

        a{
            font-size:30px;
            color:whitesmoke;
            padding-left:20px;
            text-decoration: none;
        }

        a:hover{
            color: blue;
            font-family: 隶书;
        }

    </style>
</head>
<body>
<div class="mainDiv">
    <div class="titleDiv">欢迎进入学生信息管理平台</div>
    <%
        if(session.getAttribute("login") == null) {
            session.setAttribute("loginErrorMessage", "您必须先登录才能访问主页！");
            response.sendRedirect("index.jsp");
        }
    %>
    <div class="Navigation">
        <a href="addStudent.jsp">添加学生</a>
        <a href="ShowStudentsByPageServlet">分页查询</a>
        <a href="ShowAllStudentsServlet">查看所有学生信息</a>
        <a href="QuitServlet">退出登录</a>
    </div>
</div>
</body>
</html>

（4）添加学生界面 (addStudent.jsp)

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <title>添加学生信息</title>

    <style>
        .titleDiv{
            height: 2px;
            color:white;
            padding-top: 12px;
            font-size: 50px;
            padding-left: 30px;
            font-family: 隶书;
        }

        .mainDiv{
            width: 899px;
            height: 500px;
            border: 4px rgb(237, 237, 237) solid;
            border-radius: 5px;
            background-image: url("图片链接");
            margin: auto;
            margin-top: 50px;
            background-size: auto;
        }

        .addDiv{
            height: 380px;
            width: 260px;
            padding:50px;
            background-color:rgba(255,255,255,0.9);
            border-radius:25px;
            border:1px #bdbdbd solid;
            opacity:0.9;
            float: right;
            margin-right: 80px
        }

        .name{
            font-size: 20px;

        }

        .item{
            height:60px;
        }

        .item input{
            line-height:40px;
            width:245px;
            border:none;
            border-bottom: 1px solid #59c2c5;
            margin-bottom: 20px;
            margin-top: 10px;
        }

        .btn{
            display:block;
            width:255px;
            height:50px;
            color:#fff;
            background:#59c2c5;
            font-size:16px;
            line-height:30px;
            text-align:center;
            border-radius:10px;
            border:none;
            margin-top: 10px;
        }

        a{
            font-size:18px;
            padding-left:200px;
            padding-bottom: 50px;
            color:#59c2c5;

        }

    </style>
</head>

<body>
<div class="mainDiv">
    <div class="titleDiv">学生信息管理平台</div>
    <form action = "AddServlet">
        <div class = "addDiv">
            <div class = "name">添加学生信息</div>

            <div class = "item">
                <input type = "text" name="sno" placeholder="学号"/>
            </div>
            <div class = "item">
                <input type = "text" name="sname" placeholder="姓名"/>
            </div>
            <div class = "item">
                <input type = "text" name="sex" placeholder="性别"/>
            </div>
            <div class = "item">
                <input type = "text" name="age" placeholder="年龄"/>
            </div>
            <div class = "item">
                <input type = "text" name="phone" placeholder="电话"/>
            </div>
            <input type = "submit" class = "btn" value = "添加"/>
            <a href = "main.jsp">返回</a>
        </div>
    </form>
</div>
</div>
</body>
</html>

（5）分页查询界面（showAllStudentByPageNo.jsp)

<%@ page import="com.stu.po.Student" %>
<%@ page import="java.util.List" %>
<%@ page import="com.stu.po.Page" %>
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>

  <title>学生信息管理平台</title>

  <style>
    .mainDiv{
      width: 900px;
      height: 550px;
      border: 4px rgb(237, 237, 237) solid;
      border-radius: 5px;
      background-image: url("图片链接");
      margin: auto;
      background-size: auto;
    }

    .titleDiv{
      height: 20px;
      color:white;
      padding-top: 30px;
      font-size: 50px;
      padding-left: 30px;
      font-family: 隶书;
    }

    .showStudentDiv{
      background-size: cover;
      width:700px;
      height:500px;
      margin: auto;
      margin-top: 50px;

    }

    .item{
      height:40px;
      border-radius:15px;
    }

    .item a{
      background-color: lightgrey;
      text-decoration: none;
      font-size:15px;
      color:black;
      border-radius:3px;
    }

    .item input{
      width: 20px;
      text-align: center;
    }


    table{
      width:100%;
      border-collapse:collapse;
      background-color: rgba(255,255,255,0.9);
      opacity: 0.8;
    }


    table body{
      display: block;
      height:300px;
      overflow-y: scroll;
    }
    table td{
      border:1px solid #A6A6A6;
      height:30px;
      width: 300px;
      text-align: center;
      font-size: 15px;
    }
    table th{
      height:30px;
      border:1px solid #A6A6A6;
    }

  </style>
</head>
<body>
<div class="mainDiv">
  <div class="titleDiv">分页查询学生信息</div>
    <div class = "showStudentDiv">
      <table  border="2" cellspacing="0">
        <tr>
          <th><h3>学号</h3></th>
          <th><h3>姓名</h3></th>
          <th><h3>性别</h3></th>
          <th><h3>年龄</h3></th>
          <th><h3>电话</h3></th>

        </tr>
        <%
          Page page1 = (Page)request.getAttribute("page1");

          for(Student student:page1.getStudent()){

        %>
            <tr>
              <td><%=student.getSno() %></td>
              <td><%=student.getSname() %></td>
              <td><%=student.getSex() %></td>
              <td><%=student.getAge() %></td>
              <td><%=student.getPhone() %></td>
            </tr>
          <%
            }
          %>
      </table>

      <%
        if(page1.getCurrentPage()==page1.getTotalPage()){
      %>
        <div class = item>
          <a href = "ShowStudentsByPageServlet?currentPage=0">首页</a>
          <a href = "ShowStudentsByPageServlet?currentPage=<%=page1.getCurrentPage()-1%>">上一页</a>
          <input type = "text" name = "currentPage" value="<%=page1.getTotalPage()+1%>"/>
        </div>
      <%
      } else if(page1.getCurrentPage()==0){
      %>
        <div class = item>
          <input type = "text" name = "currentPage" value="1"/>
          <a href = "ShowStudentsByPageServlet?currentPage=<%=page1.getCurrentPage()+1%>">下一页</a>
          <a href = "ShowStudentsByPageServlet?currentPage=<%=page1.getTotalPage()%>">尾页</a>
        </div>
      <%
      } else{
      %>
        <div class = item>
          <a href = "ShowStudentsByPageServlet?currentPage=0">首页</a>
          <a href = "ShowStudentsByPageServlet?currentPage=<%=page1.getCurrentPage()-1%>">上一页</a>
          <input type = "text" name = "currentPage" value="<%=page1.getCurrentPage()+1%>"/>
          <a href = "ShowStudentsByPageServlet?currentPage=<%=page1.getCurrentPage()+1%>">下一页</a>
          <a href = "ShowStudentsByPageServlet?currentPage=<%=page1.getTotalPage()%>">尾页</a>
        </div>
      <%
        }
      %>

      <a href = "main.jsp">返回</a>
    </div>
</div>
</body>
</html>

（6）查看所有学生信息界面

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ page import="com.stu.po.Student" %>
<%@ page import="java.util.List" %>
<!DOCTYPE html>
<html>
<head>
	<title>学生信息管理平台</title>

	<style>
		.mainDiv{
			width: 900px;
			height: 700px;
			border: 4px rgb(237, 237, 237) solid;
			border-radius: 5px;
			background-image: url("图片链接");
			margin: auto;
			background-size: auto;
		}

		.titleDiv{
			height: 20px;
			color:white;
			padding-top: 30px;
			font-size: 50px;
			padding-left: 30px;
			font-family: 隶书;
		}

		.showStudentDiv{
			background-size: cover;
			width:700px;
			height:500px;
			margin: auto;
			margin-top: 50px;

		}

		.item{
			height:40px;
			border-radius:15px;
		}

		.item a{
			background-color: lightgrey;
			text-decoration: none;
			font-size:15px;
			color:black;
			border-radius:3px;
		}


		table{
			width:100%;
			border-collapse:collapse;
			background-color: rgba(255,255,255,0.9);
			opacity: 0.8;
		}


		table body{
			display: block;
			height:300px;
			overflow-y: scroll;
		}
		table td{
			border:1px solid #A6A6A6;
			height:30px;
			width: 300px;
			text-align: center;
			font-size: 15px;
		}
		table th{
			height:30px;
			border:1px solid #A6A6A6;
		}



	</style>
</head>
<body>
<div class="mainDiv">
	<div class="titleDiv">查看所有学生信息</div>
	<div class = "showStudentDiv">
		<table  border="2" cellspacing="0">
			<tr>
				<th><h3>学号</h3></th>
				<th><h3>姓名</h3></th>
				<th><h3>性别</h3></th>
				<th><h3>年龄</h3></th>
				<th><h3>电话</h3></th>
				<th><h3>操作</h3></th>
			</tr>
			<%

				List<Student> allStudents = (List<Student>)session.getAttribute("allStudents");
				for (int i = 0; i < allStudents.size(); i++) {
					Student s  = allStudents.get(i);
			%>
			<tr>
				<td><%=s.getSno() %></td>
				<td><%=s.getSname() %></td>
				<td><%=s.getSex() %></td>
				<td><%=s.getAge() %></td>
				<td><%=s.getPhone() %></td>
				<td>
					<a href = "DeleteServlet?sno=<%=s.getSno() %>">删除</a>
					<a href = "QueryStudentBySnoServlet?sno=<%=s.getSno()%>">修改</a>
				</td>
			</tr>
			<%
				}
			%>
		</table>
		<a href = "main.jsp">返回</a>
	</div>

</div>
</body>
</html>

（7） 修改学生界面 (updateStudent.jsp)

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ page import="com.stu.po.Student" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>修改学生信息</title>

    <style>
        .titleDiv{
            height: 20px;
            color:white;
            padding-top: 30px;
            font-size: 50px;
            padding-left: 30px;
            font-family: 隶书;
        }

        .mainDiv{
            width: 899px;
            height: 500px;
            border: 4px rgb(237, 237, 237) solid;
            border-radius: 5px;
            background-image: url("https://img1.baidu.com/it/u=4271373647,1745018175&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500");
            margin: auto;
            margin-top: 50px;
            background-size: auto;
        }

        .updateDiv{
            height: 340px;
            width: 260px;
            padding:50px;
            background-color:rgba(255,255,255,0.9);
            border-radius:25px;
            border:1px #bdbdbd solid;
            opacity:0.9;
            float: right;
            margin-right: 100px
        }

        .name{
            font-size: 25px;
        }

        .item{
            height:60px;
        }

        .item input{
            line-height:40px;
            width:245px;
            border:none;
            border-bottom: 1px solid #59c2c5;
            margin-bottom: 20px;
            margin-top: 10px;
        }

        .btn{
            display:block;
            width:255px;
            height:50px;
            color:#fff;
            background:#59c2c5;
            font-size:16px;
            line-height:30px;
            text-align:center;
            border-radius:10px;
            border:none;
            margin-top: 10px;
        }

        a{
            font-size:18px;
            padding-right:100px;
            padding-bottom: 50px;
        }

    </style>
</head>

<body>
<div class="mainDiv">
    <div class="titleDiv">学生信息管理平台</div>

    <form action = "UpdateServlet">
        <%
            Student s =(Student)request.getAttribute("student");
        %>
        <div class = "updateDiv">
            <div class = "name">修改学生信息</div>
            <input type="hidden" name="sno" value="<%=s.getSno()%>"/>
            <div class = "item">
                <input type = "text" name="sname" placeholder="姓名" value="<%=s.getSname()%>"/>
            </div>
            <div class = "item">
                <input type = "text" name="sex" placeholder="性别" value="<%=s.getSex()%>"/>
            </div>
            <div class = "item">
                <input type = "text" name="age" placeholder="年龄" value="<%=s.getAge()%>"/>
            </div>
            <div class = "item">
                <input type = "text" name="phone" placeholder="电话" value="<%=s.getPhone()%>"/>
            </div>
            <input type = "submit" class = "btn" value = "修改"/>
            <a href = "showAllStudents.jsp">返回</a>
        </div>
    </form>
</div>
</div>
</body>
</html>

2.JavaBean实体类封装数据

（1）学生信息类 (Student.java)

package com.stu.po;

public class Student {
    //这是一个实体类，javabean

    private int sno;
    private String sname;
    private String sex;
    private int age;
    private String phone;

    public Student(int sno, String sname, String sex, int age, String phone) {
        this.sno = sno;
        this.sname = sname;
        this.sex = sex;
        this.age = age;
        this.phone = phone;
    }

    public Student() {

    }

    public int getSno() {
        return sno;
    }

    public void setSno(int sno) {
        this.sno = sno;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
}

（2）分页帮助类 (Page.java)

package com.stu.po;
import java.util.List;
//分页帮助类
public class Page {
    private int currentPage;  //当前页面
    private int pageSize;     //一页有多少条数据
    private int totalCount;   //一共有多少条数据
    private int totalPage;    //一共有多少页
    private List<Student> student;
    public Page() {
    }
    public Page(int currentPage, int pageSize, int totalCount, int totalPage, List<Student> student) {
        this.currentPage = currentPage;
        this.pageSize = pageSize;
        this.totalCount = totalCount;
        this.totalPage = totalPage;
        this.student = student;
    }
    public int getCurrentPage() {
        return currentPage;
    }
    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }
    public int getPageSize() {
        return pageSize;
    }
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }
    public int getTotalCount() {
        return totalCount;
    }
    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }
    public int getTotalPage() {
        return totalPage;
    }
    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }
    public List<Student> getStudent() {
        return student;
    }
    public void setStudent(List<Student> student) {
        this.student = student;
    }
}

（3）JDBC工具类 (DBTools.java)

package com.stu.utils;
public interface DBTools {
    public static final String DRIVER_CLASS = "com.mysql.jdbc.Driver";
    public static final String CONN_STR = "jdbc:mysql://localhost:3306/studentmanager?userSSL=false&serverTimezone=Asia/Shanghai";
    public static final String USRENAME = "root";
    public static final String PWD = "123456";
}

3.三层架构

（1）表示层servlet

① 用户登录表示层 (LoginServlet.java)

package com.stu.servlet;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        StudentService service = new StudentServiceImpl();
        HttpSession session = request.getSession();

        if (session.getAttribute("loginErrorMessage") != null) {
            session.invalidate();
        }
        String uid = request.getParameter("uid");
        String pwd = request.getParameter("pwd");


        int _uid = Integer.parseInt(uid);
        boolean result = service.login(_uid, pwd);

        if(result){
            session.setAttribute("login", "log");
            response.sendRedirect("main.jsp");
        }else{
            response.sendRedirect("index.jsp");
        }

    }

}

② 用户注册表示层 (RegisterServlet.java)

package com.stu.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        StudentService service = new StudentServiceImpl();
        String uid = request.getParameter("uid");
        String pwd = request.getParameter("pwd");
        int _uid = Integer.parseInt(uid);
        boolean result = service.addLogin(_uid,pwd);

        if(!result) {
            request.setAttribute("register", "reg");
            request.getRequestDispatcher("index.jsp").forward(request, response);
        }else {
            request.getRequestDispatcher("register.jsp").forward(request, response);
        }

    }

}

③ 分页查询表示层 (ShowStudentsByPageServlet.java)

package com.stu.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.stu.po.Page;
import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

@WebServlet("/ShowStudentsByPageServlet")
public class ShowStudentsByPageServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        StudentService Service = new StudentServiceImpl();
        int count = Service.getTotalCount();

        Page page = new Page();


        String currentPage = request.getParameter("currentPage");

        if(currentPage == null) {
            currentPage = "0";
        }
        int _currentPage = Integer.parseInt(currentPage);
        page.setCurrentPage(_currentPage);

        int totalCount = Service.getTotalCount();
        page.setTotalCount(totalCount);


        int pageSize = 5;
        int totalPage = (totalCount / pageSize) + 1;
        page.setTotalPage(totalPage+1);


        page.setPageSize(pageSize);

        List<Student> student = Service.queryStudentsByPageNo(_currentPage, pageSize);
        page.setStudent(student);

        request.setAttribute("page1", page);
        request.getRequestDispatcher("showAllStudentsByPageNo.jsp").forward(request, response);
    }

}

④ 查询所学生信息表示层 (ShowAllStudentsServlet.java)

package com.stu.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

@WebServlet("/ShowAllStudentsServlet")
public class ShowAllStudentsServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        StudentService service = new StudentServiceImpl();
        HttpSession  session =   request.getSession();
        List<Student> allStudents = service.getAllStudents();
        session.setAttribute("allStudents", allStudents);
        response.sendRedirect("showAllStudents.jsp");
    }

}

⑤ 添加学生表示层 (AddServlet.java)

package com.stu.servlet;

import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        StudentService service = new StudentServiceImpl();
        String sno  = request.getParameter("sno");
        String sname  = request.getParameter("sname");
        String sex  = request.getParameter("sex");
        String age  = request.getParameter("age");
        String phone  = request.getParameter("phone");

        int _sno = 0;
        if(sno != null || "".equals(sno)){
            _sno = Integer.parseInt(sno);
        }

        int _age = 0;
        if (age !=null || "".equals(age)){
            _age = Integer.parseInt(age);
        }

        Student s = new Student(_sno, sname, sex, _age, phone);
        int result = service.addStudent(s);

        HttpSession session = request.getSession();
        session.setAttribute("student", "stu");
        response.sendRedirect("main.jsp");

    }
}

⑥ 删除学生表示层 (DeleteServlet.java)

package com.stu.servlet;

import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@WebServlet("/DeleteServlet")
public class DeleteServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取sno
        String sno = request.getParameter("sno");

        int _sno = 0;
        if(sno != null && !"".equals(sno)){
            _sno = Integer.parseInt(sno);
        }

        //2.执行删除
        StudentService service = new StudentServiceImpl();
        Student stu = service.deleteStudent(_sno);
        //3.跳转到列表页
        request.setAttribute("stu", stu);
        request.getRequestDispatcher("ShowAllStudentsServlet").forward(request,response);
    }
}

⑦ 根据学号查询学生信息表示层 (QueryStudentBySnoSevlet.java)

package com.stu.servlet;

import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;



@WebServlet("/QueryStudentBySnoServlet")
public class QueryStudentBySnoServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取sno;
        String sno = request.getParameter("sno");
        int _sno = 0;
        if(sno != null && !"".equals(sno)){
            _sno = Integer.parseInt(sno);
        }

        //2.查询学生数据
        StudentService service = new StudentServiceImpl();
        Student student = service.queryStudentBySno(_sno);

        //3.显示数据
        //存数据
        request.setAttribute("student", student);
        //跳转
        request.getRequestDispatcher("updateStudent.jsp").forward(request,response);

    }
}

⑧ 修改学生信息表示层 (UpdateServlet.java)

package com.stu.servlet;

import com.stu.po.Student;
import com.stu.service.StudentService;
import com.stu.service.StudentServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

@WebServlet("/UpdateServlet")
public class UpdateServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {

        String sno = request .getParameter("sno");
        String sname  = request.getParameter("sname");
        String sex  = request.getParameter("sex");
        String age  = request.getParameter("age");
        String phone  = request.getParameter("phone");

        int _sno = 0;
        if(sno != null && !"".equals(sno)){
            _sno = Integer.parseInt(sno);
        }
        int _age = 0;
        if(age != null && !"".equals(age)){
            _age = Integer.parseInt(age);
        }


        Student stu = new Student(_sno, sname, sex, _age, phone);

        StudentService service = new StudentServiceImpl();
        service.updateStudentBySno(_sno,stu);

        //3.跳转界面
        request.getRequestDispatcher("ShowAllStudentsServlet").forward(request, resp);

    }
}

⑨ 退出登录表示层 (QuitServlet.java)

package com.stu.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


@WebServlet("/QuitServlet")
public class QuitServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession  session =   request.getSession();
        session.invalidate();//清空session对象中的所有属性数据内容
        resp.sendRedirect("index.jsp");
    }
}

（2）业务逻辑层service

① Service接口（StudentService.java）

package com.stu.service;
import java.util.List;
import com.stu.po.Student;
public interface StudentService {
    //service表示业务逻辑层,定义的每一个方法实际上对应的就是用户的一个需求(请求)
    public boolean login(int uid,String pwd);
    public boolean addLogin(int uid, String pwd);
    public List<Student> getAllStudents();
    public List<Student> queryStudentsByPageNo(int current, int pageSize);
    public Student deleteStudent(int sno);
    public Student queryStudentBySno(int sno);
    public int updateStudentBySno(int sno, Student stu) ;
    public int getTotalCount();
    public int addStudent(Student student);
}

② 接口的实现类（StudentServiceImpl.java）

package com.stu.service;
import java.util.List;
import com.stu.dao.StudentDao;
import com.stu.dao.StudentDaoImpl;
import com.stu.po.Student;
public class StudentServiceImpl implements StudentService {
    StudentDao dao = new StudentDaoImpl();
    //登陆
    @Override
    public boolean login(int uid, String pwd) {
        return dao.login(uid, pwd);
    }
    // 注册
    @Override
    public boolean addLogin(int uid, String pwd){
        return dao.addLogin(uid, pwd);
    }
    // 查询所有学生
    @Override
    public List<Student> getAllStudents() {
        return dao.getAllStudents();
    }
    // 分页查询
    @Override
    public List<Student> queryStudentsByPageNo(int current, int pageSize) {
        return dao.queryStudentByPage(current,pageSize);
    }
    // 删除学生
    @Override
    public Student deleteStudent(int sno){
        return dao.deleteStudent(sno);
    }
    // 修改学生信息，要先根据学号查询学生信息
    public Student queryStudentBySno(int sno) {
        return dao.queryStudentBySno(sno);
    }
    //更改学生信息
    public int updateStudentBySno(int sno, Student stu) {
        return dao.updateStudentBySno(sno,stu);
    }
    //查询总条数
    @Override
    public int getTotalCount() {
        return dao.getTotalCount();
    }
    @Override
    public int addStudent(Student student) {
        return dao.addStudent(student);
    }
}

（3）数据访问层dao

① 接口（StudentDao.java）

package com.stu.dao;
import java.util.List;
import com.stu.po.Student;
public interface StudentDao {
    public boolean login(int uid ,String pwd);
    public boolean addLogin(int uid, String pwd);
    public List<Student> getAllStudents();
    public List<Student> queryStudentByPage(int currentPage,int pageSize);
    public Student deleteStudent(int sno);
    public Student queryStudentBySno(int sno);
    public int updateStudentBySno(int sno,Student stu);
    //查询总数据数
    public int getTotalCount();
    public int addStudent(Student student);
}

② 接口的实现类（StudentDaoImpl.java）

package com.stu.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import com.stu.po.Student;
import com.stu.utils.DBTools;
public class StudentDaoImpl implements StudentDao {
    Connection conn = null; // 连接对象
    Statement st = null; // 语句对象
    ResultSet rs = null; // 结果集合对象
    @Override
    public boolean login(int uid, String pwd) {
        // 在这里需要连接数据库，根据int sno, String pwd这两个参数来查询student表
        // jdbc
        // 1:配置环境，下载数据库连接驱动jar文件，拷贝到项目中来
        // 2:加载驱动，根据驱动创建数据库的连接对象
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            // 3:执行sql语句，完成对数据库中表的数据的增删该查。必须创建一个语句对象（执行sql语句的）
            st = conn.createStatement();
            int count = 0;
            String sqlStr = "select * from login where uid =" + uid + " and pwd = '" + pwd + "'";
            rs = st.executeQuery(sqlStr);
            while(rs.next()) {
                count++;
            }
            if(count>0)
                return true;
            else
                return false;
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return false;
    }
    @Override
    public List<Student> getAllStudents() {
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            // 3:执行sql语句，完成对数据库中表的数据的增删该查。必须创建一个语句对象（执行sql语句的）
            st = conn.createStatement();
            String sqlStr = "select * from student";
            rs = st.executeQuery(sqlStr);
            List<Student> allStudents = new ArrayList<Student>();
            while (rs.next()) {
                int _sno = rs.getInt(1);
                String _sname = rs.getString(2);
                String _sex = rs.getString(3);
                int _age = rs.getInt(4);
                String _phone = rs.getString(5);
                Student s = new Student(_sno, _sname, _sex, _age, _phone);
                allStudents.add(s);
            }
            return allStudents;
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
    public List<Student> queryStudentByPage(int current, int pageSize) {
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            // 3:执行sql语句，完成对数据库中表的数据的增删该查。必须创建一个语句对象（执行sql语句的）
            st = conn.createStatement();
            int startPosition = current * pageSize;
            String sqlStr = "select * from student limit " + startPosition + "," + pageSize;
            rs = st.executeQuery(sqlStr);
            List<Student> allStudents = new ArrayList<Student>();
            while (rs.next()) {
                int _sno = rs.getInt(1);
                String _sname = rs.getString(2);
                String _sex = rs.getString(3);
                int _age = rs.getInt(4);
                String _phone = rs.getString(5);
                Student s = new Student(_sno, _sname, _sex, _age, _phone);
                allStudents.add(s);
            }
            return allStudents;
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
    public int getTotalCount() {//查询总数据数
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            // 3:执行sql语句，完成对数据库中表的数据的增删该查。必须创建一个语句对象（执行sql语句的）
            st = conn.createStatement();
            String sql = "select count(*) from student";
            rs = st.executeQuery(sql);
            while (rs.next()){
                int totalCount = rs.getInt(1);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        return 0;
    }
    @Override
    public int addStudent(Student student) {
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            st = conn.createStatement();
            String sqlStr = "insert into student values("+student.getSno()+",'" + student.getSname()+ "','" + student.getSex() +"',"+student.getAge()+",'"+student.getPhone()+"')";
            System.out.println(sqlStr);
            int result = st.executeUpdate(sqlStr);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }
    @Override
    public boolean addLogin(int uid, String pwd) {
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            st = conn.createStatement();
            String sqlStr = "insert into login values(" + uid + ",'" + pwd + "')";
            int result = st.executeUpdate(sqlStr);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return false;
    }
    @Override
    public Student deleteStudent(int sno) {
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            st = conn.createStatement();
            String sqlStr = "delete from student where sno = " + sno;
            System.out.println(sqlStr);
            int result = st.executeUpdate(sqlStr);
        } catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
    @Override
    public Student queryStudentBySno(int sno) {
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            st = conn.createStatement();
            String sqlStr = "select * from student where sno = "+ sno;
            rs = st.executeQuery(sqlStr);
            if (rs.next()) {
                int _sno = rs.getInt(1);
                String _sname = rs.getString(2);
                String _sex = rs.getString(3);
                int _age = rs.getInt(4);
                String _phone = rs.getString(5);
                Student s = new Student(_sno, _sname, _sex, _age, _phone);
                return s;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    @Override
    public int updateStudentBySno(int sno, Student stu){
        try {
            Class.forName(DBTools.DRIVER_CLASS);// 加载驱动
            conn = DriverManager.getConnection(DBTools.CONN_STR, DBTools.USRENAME, DBTools.PWD);
            st = conn.createStatement();
            String sql = "update student set sname= '"+stu.getSname()+"', sex='"+stu.getSex()+"', age="+stu.getAge()+", phone='"+stu.getPhone()+"' where sno="+sno;
            System.out.println(sql);
            int result = st.executeUpdate(sql);
        } catch (Exception e){
            e.printStackTrace();
        }
        return 0;
    }
}

总结

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