IDEA+Java+JSP+Mysql+Tomcat实现Web学生信息管理系统

Posted 2021-07-09 水坚石青

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一、系统介绍

软件环境
IDEA：2018.2
Java：jdk1.8
mysql：8.0.13
Tomcat：8.5.23

系统功能
1.管理员登录系统
2.增加学生信息
3.修改学生信息
3.删除学生信息
4.查询学生信息

数据库涉及的表
admin
student

二、系统展示

1.登录系统

在这里插入图片描述

2.主页面

在这里插入图片描述

3.增加学生信息

在这里插入图片描述

4.修改学生信息

在这里插入图片描述

5.查询学生信息

在这里插入图片描述

三、代码实现

AdminDao

package com.sjsq.dao;

import com.sjsq.vo.Admin;

/**
 * @author shuijianshiqing
 * @date 2021/5/1 9:46
 */
public interface AdminDao {

    /**
     * 用户登录
     * @param admin
     * @return
     */
    public Admin login(Admin admin);
}

AdminDaoImpl

package com.sjsq.dao.impl;

import com.sjsq.dao.AdminDao;
import com.sjsq.utils.DBUtil;
import com.sjsq.vo.Admin;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * @author shuijianshiqing
 * @date 2021/5/1 9:49
 */
public class AdminDaoImpl implements AdminDao {

    /**
     * 用户登录
     * @param admin
     * @return
     */
    @Override
    public Admin login(Admin admin) {
        Connection con = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            // 1.获取数据库连接
            con = DBUtil.getConnection();
            // 2.写sql
            String sql = "select * from admin where username = ? and password = ?";
            // 3.预编译
            ps = con.prepareStatement(sql);
            // 4.设置值
            ps.setObject(1,admin.getUsername());
            ps.setObject(2,admin.getPassword());
            rs = ps.executeQuery();
            Admin adminLogin = null;
            if(rs.next()){
                adminLogin = new Admin();
                // 从数据库中获取值到实体类的setter方法中
                adminLogin.setUsername(rs.getString("username"));
                adminLogin.setPassword(rs.getString("password"));

                // 返回的是你查询出来的完整的对象
                return adminLogin;

            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            // 关闭资源，避免出现异常
            DBUtil.close(con,ps,rs);
        }
        return null;
    }
}

StudentDao

package com.sjsq.dao;


import com.sjsq.vo.Student;
import java.util.List;

/**
 * @author shuijianshiqing
 * @date 2021/4/30 7:52
 *
 * 学生信息接口
 */

public interface StudentDao {


    /**
     * 查询学生信息
     * @param sql
     * @param arr
     * @return
     */
    public List<Student> selectAll(String sql, Object[] arr);


    /**
     * 根据学号进行查询
     * @param id
     * @return
     */
    public Student selectStudent(Integer id);


    /**
     * 新增学生信息
     * @param student
     * @return
     */
    public boolean addStudent(Student student);

    /**
     * 修改学生信息
     * @param student
     * @return
     */
    public boolean updateStudent(Student student);

    /**
     * 删除学生信息
     * @param id
     * @return
     */
    public boolean deleteStudent(Integer id);
}

AdminService

package com.sjsq.service;

import com.sjsq.vo.Admin;

/**
 * @author shuijianshiqing
 * @date 2021/5/1 11:13
 */
public interface AdminService {

    /**
     * 用户登录
     * @param admin
     * @return
     */
    public Admin login(Admin admin);
}

AdminServiceImpl

package com.sjsq.service.impl;

import com.sjsq.dao.AdminDao;
import com.sjsq.dao.impl.AdminDaoImpl;
import com.sjsq.service.AdminService;
import com.sjsq.vo.Admin;

/**
 * @author shuijianshiqing
 * @date 2021/5/1 11:13
 */
public class AdminServiceImpl implements AdminService {

    private AdminDao adminDao = new AdminDaoImpl();

    @Override
    public Admin login(Admin admin) {
        return adminDao.login(admin);
    }
}

StudentService

package com.sjsq.service;

import com.sjsq.vo.Student;

import java.util.List;

/**
 * @author shuijianshiqing
 * @date 2021/5/1 8:26
 */
public interface StudentService {

    /**
     * 查询学生信息
     * @param student
     * @return
     */
    public List<Student> selectAll(Student student);


    /**
     * 根据学号进行查询
     * @param id
     * @return
     */
    public Student selectStudent(Integer id);


    /**
     * 新增学生信息
     * @param student
     * @return
     */
    public boolean addStudent(Student student);

    /**
     * 修改学生信息
     * @param student
     * @return
     */
    public boolean updateStudent(Student student);

    /**
     * 删除学生信息
     * @param id
     * @return
     */
    public boolean deleteStudent(Integer id);
}

StudentServiceImpl

package com.sjsq.service.impl;

import com.sjsq.dao.StudentDao;
import com.sjsq.dao.impl.StudentDaoImpl;
import com.sjsq.service.StudentService;
import com.sjsq.vo.Student;

import java.util.ArrayList;
import java.util.List;

/**
 * @author shuijianshiqing
 * @date 2021/5/1 8:26
 */
public class StudentServiceImpl implements StudentService {

    private StudentDao studentDao = new StudentDaoImpl();
    
    @Override
    public List<Student> selectAll(Student student) {
        StringBuffer sql = new StringBuffer("select * from student where 1 = 1 ");
        List<Object> list = new ArrayList<Object>();
        if(student != null){
            // 根据id来查找对应的学生信息
            if(student.getId() != null && student.getId() != 0){
                sql.append(" and id = ?");
                list.add(student.getId());
            }
        }
        return studentDao.selectAll(sql.toString(),list.toArray());
    }

    @Override
    public Student selectStudent(Integer id) {
        return studentDao.selectStudent(id);
    }

    @Override
    public boolean addStudent(Student student) {
        return studentDao.addStudent(student);
    }

    @Override
    public boolean updateStudent(Student student) {
        return studentDao.updateStudent(student);
    }

    @Override
    public boolean deleteStudent(Integer id) {
        return studentDao.deleteStudent(id);
    }
}

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
    <%
        // 获取绝对路径路径 ,开发项目一定要使用绝对路径，不然肯定出错
        String path = request.getContextPath();
        String basePath = request.getScheme() + "://" + request.getServerName() + ":"
                + request.getServerPort() + path + "/";
    %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <base href="<%=basePath %>" />
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>用户登录</title>
    <style type="text/css">
        h1{
            text-align: center;
        }
        h4{
            text-align: center;color: red;
        }
        body{
            background-color: antiquewhite;
        }
        a{
            text-decoration: none;font-size: 20px;color: black;
        }
        a:hover{
            text-decoration: underline;font-size: 24px;color: red;
        }
    </style>
</head>
<body>
    <form action="check_login.jsp" method="post">
        <h1>用户登录</h1>
        <hr/>
        <table align="center">
            <tr>
                <td>账号：</td>
                <td><input type="text" name="username" placeholder="请输入您的账号" autofocus="autofocus"></td>
            </tr>
            <tr>
                <td>密码：</td>
                <td><input type="password" name="password" placeholder="请输入您的密码"></td>
            </tr>
            <tr>
                <td colspan="1">
                </td>
                <td>
                    <input type="submit" value="登录"/>
                    <input type="reset" value="重置"/>
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

check_login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<%@ page import="com.sjsq.service.AdminService"%>
<%@ page import="com.sjsq.service.impl.AdminServiceImpl"%>
<%@ page import="com.sjsq.vo.Admin"%>
<%
    // 获取绝对路径路径 ,开发项目一定要使用绝对路径，不然肯定出错
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":"
            + request.getServerPort() + path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <base href="<%=basePath %>" />
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>用户登录</title>
    <style type="text/css">
        h1{
            text-align: center;
        }
        h4{
            text-align: center;color: red;
        }
        body{
            background-color: antiquewhite;
        }
    </style>
</head>
<body>
    <h1>用户登录</h1>
    <hr>
    <%
        // 设置接收的编码为UTF-8
        request.setCharacterEncoding("utf-8");


        // 获取前端传过来的字符串
        String username = request.getParameter("username");
        String password=request.getParameter("password");

        // 定义接受的对象
        Admin admin = new Admin();
        admin.setUsername(username);
        admin.setPassword(password);


        // 把数据库里面的Admin获取出来
        AdminService adminService = new AdminServiceImpl();
        // 注意数据的admin账号密码不能重复
        Admin adminLogin = adminService.login(admin);

        System.out.println("显示登录用户信息：");
        System.out.println(adminLogin);

        // 设置session
        session.setAttribute("admin",adminLogin);

        // 判断adminLogin是否为空
        if(!(adminLogin==null)){
            // 成功之后重定向到主页面
            response.sendRedirect("main.jsp");
        } else{
            // 失败之后重定向到失败页面
            response.sendRedirect("fail.jsp");
        }
    %>
</body>
</html>

logout.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>退出登录</title>
</head>
<body>
    <%
        // 会话失效
        session.invalidate();
        response.sendRedirect("login.jsp");
    %>
</body>
</html>

main.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<%@ page import="com.sjsq.service.StudentService" %>
<%@ page import="com.sjsq.service.impl.StudentServiceImpl" %>
<%@ page import="com.sjsq.vo.Student" %>
<%@ page import="java.util.List" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>查看学生</title>
    <style type="text/css">
        h1 {
            text-align: center;
        }

        body {
            background-color: antiquewhite;
        }

        th, td {
            width: 70px;
            height: 35px;
            text-align: center;
        }

        #before {
            text-align: center;
        }

    </style>
</head>
<body>
    <%-- 头部 --%>
    <jsp:include page="top.jsp"/>
<%
    // 设置获取注册时的编码为UTF-8
    request.setCharacterEncoding("UTF-8");

    StudentService studentService = new StudentServiceImpl();
    // 定义一个学生类
    Student student = new Student();

    // 获取上一个页面传过来的值
    if(request.getParameter("id")!=null && request.getParameter("id")!=""){
        Integer id = Integer.parseInt(request.getParameter("id"));
        student.setId(id);
    }

    // 获取所有学生
    List<Student> studentList = studentService.selectAll(student);
%>
<h1>学生列表</h1>
<hr/>
<div id="before">
    <form action="main.jsp" method="post">
        请输入姓名：<input type="text" name="id" placeholder="输入学号搜索">
        <input type="submit" value="查询" />
    </form>
</div>
<br>
<table align="center" cellspacing="0" align="center">
    <tr bgcolor="#5f9ea0">
        <th>学号</th>
        <th>姓名</th>
        <th>年龄</th>
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