JavaWeb实现学生管理系统
- 一、项目介绍
- 二、项目结构
- 三、前期准备
- 四、代码实现
- 1.JSP界面实现
- 2.JavaBean实体类封装数据
- 3.三层架构
- （1）表示层servlet
- ① 用户登录表示层 (LoginServlet.java)
- ② 用户注册表示层 (RegisterServlet.java)
- ③ 分页查询表示层 (ShowStudentsByPageServlet.java)
- ④ 查询所学生信息表示层 (ShowAllStudentsServlet.java)
- ⑤ 添加学生表示层 (AddServlet.java)
- ⑥ 删除学生表示层 (DeleteServlet.java)
- ⑦ 根据学号查询学生信息表示层 (QueryStudentBySnoSevlet.java)
- ⑧ 修改学生信息表示层 (UpdateServlet.java)
- ⑨ 退出登录表示层 (QuitServlet.java)
- （2）业务逻辑层service
- （3）数据访问层dao
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
数据库：MySQL
开发工具：idea
开发环境：jdk 1.8 + tomcat
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;
}
}