一、項目簡介隨著互聯網迅速發展，人們的生活已經越來越離不開互聯網，人們足不出戶就可以工作、學習等。對於在校學生，通過網路教育不僅可以隨時進行網路學習，也可以根據學習的情況自我檢測，有利於學生高效、快捷地掌握所學的知識。本系統預設計的基於網路的學生自測系統將實現多種用戶（包括學生、教師、管理員）同 ...

一、項目簡介

隨著互聯網迅速發展，人們的生活已經越來越離不開互聯網，人們足不出戶就可以工作、學習等。對於在校學生，通過網路教育不僅可以隨時進行網路學習，也可以根據學習的情況自我檢測，有利於學生高效、快捷地掌握所學的知識。
本系統預設計的基於網路的學生自測系統將實現多種用戶（包括學生、教師、管理員）同時訪問，學生登錄後可以針對課程的每一章節的每一道題目，提交答案；系統會自動按照學生的答案來判斷對錯，並自動給出成績。另外，系統還具有添加用戶、管理題庫、添加試卷、添加習題、修改密碼等功能。

簡單的一句話，這是一個完整的學生線上考試系統，導入項目和資料庫就可以使用；在本考試系統中，管理員、老師、學生三個角色是相當於是三個系統。

二、開發工具和環境

前端：html, css, js, vue等;
後端：java, spring，maven等
資料庫：mysql
開發工具： eclipse或idea
更多內容可查看：項目幫

部分核心代碼

import org.springframework.stereotype.Service;
import xyz.shiguangliang.mybatis.dao.UserMapper;

import xyz.shiguangliang.mybatis.domain.User;
import xyz.shiguangliang.service.UserService;
import xyz.shiguangliang.util.query.QueryInfo;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;
import java.util.Objects;

@Service
public class UserServiceImpl implements UserService {
    @Resource
    private UserMapper userMapper;

    //登錄
    @Override
    public User login(String username, String password) {
        User user = userMapper.selectLogin(username,password);
        if (user != null) {
            //登錄次數加一
            if (user.getIntimes() !=  null) {
                user.setIntimes(user.getIntimes() + 1);
            }else {
                user.setIntimes(1);
            }
            //更新登錄時間
            user.setLastlogin(new Date());
            return user;
        }
        return null;
    }

    //註冊
    @Override
    public boolean register(User user) {
        int i = 0;
        //檢測用戶是否存在
        User user1 = userMapper.selectUsername(user.getUsername());
        if (user1 == null) {
            i = userMapper.insert(user);
        }
        return i > 0;
    }

    //用戶列表
    @Override
    public QueryInfo getUserList(String query, Integer pagenum,Integer pagesize) {
        QueryInfo queryInfo = new QueryInfo();
        int start;
        int end;
        if (pagenum == null||pagesize == null){
            pagenum =0;
            pagesize = 3;
        }
        start = (pagenum-1)*pagesize;
        end = pagesize;
        int userSize = userMapper.selectUserListLimitSize(query,start,end);
        List<User> users = userMapper.selectUserListLimit(query,start,end);
        queryInfo.setList(users);
        queryInfo.setTotal(userSize);
        return queryInfo;
    }

    //刪除用戶
    @Override
    public int deleteUser(Integer tid) {
        return userMapper.deleteByPrimaryKey(tid);
    }

    //通過id查找用戶
    @Override
    public User findById(Integer tid) {
        return userMapper.selectByPrimaryKey(tid);
    }



    //更新用戶
    @Override
    public int updateUser(User user) {
        if (user.getPassword()==null|| Objects.equals(user.getPassword(), "")){
            user.setPassword(userMapper.selectByPrimaryKey(user.getTid()).getPassword());
        }
        return userMapper.updateByPrimaryKey(user);
    }

    //通過用戶名查找用戶
    @Override
    public User findByUsername(String username) {
        return userMapper.selectUsername(username);
    }

    //獲取用戶許可權
    @Override
    public int getPower(String username) {
        return userMapper.selectUsername(username).getPower();
    }
}

useMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="xyz.shiguangliang.mybatis.dao.UserMapper">
  <resultMap id="BaseResultMap" type="xyz.shiguangliang.mybatis.domain.User">
    <id column="tid" jdbcType="INTEGER" property="tid" />
    <result column="username" jdbcType="VARCHAR" property="username" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="teachername" jdbcType="VARCHAR" property="teachername" />
    <result column="dno" jdbcType="INTEGER" property="dno" />
    <result column="power" jdbcType="INTEGER" property="power" />
    <result column="intimes" jdbcType="INTEGER" property="intimes" />
    <result column="lastlogin" jdbcType="TIMESTAMP" property="lastlogin" />
  </resultMap>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from teacher
    where tid = #{tid,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="xyz.shiguangliang.mybatis.domain.User">
    insert into teacher (tid, username, password, 
      teachername, dno, power, 
      intimes, lastlogin)
    values (#{tid,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{teachername,jdbcType=VARCHAR}, #{dno,jdbcType=INTEGER}, #{power,jdbcType=INTEGER}, 
      #{intimes,jdbcType=INTEGER}, #{lastlogin,jdbcType=TIMESTAMP})
  </insert>
  <update id="updateByPrimaryKey" parameterType="xyz.shiguangliang.mybatis.domain.User">
    update teacher
    set username = #{username,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      teachername = #{teachername,jdbcType=VARCHAR},
      dno = #{dno,jdbcType=INTEGER},
      power = #{power,jdbcType=INTEGER},
      intimes = #{intimes,jdbcType=INTEGER},
      lastlogin = #{lastlogin,jdbcType=TIMESTAMP}
    where tid = #{tid,jdbcType=INTEGER}
  </update>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select tid, username, password, teachername, dno, power, intimes, lastlogin
    from teacher
    where tid = #{tid,jdbcType=INTEGER}
  </select>
  <select id="selectAll" resultMap="BaseResultMap">
    select tid, username, password, teachername, dno, power, intimes, lastlogin
    from teacher
  </select>
    <select id="selectLogin" resultType="xyz.shiguangliang.mybatis.domain.User">
        select tid, username, password, teachername, dno, power, intimes, lastlogin
        from teacher
        where username = #{username} and password = #{password}
    </select>
  <select id="selectUsername" resultType="xyz.shiguangliang.mybatis.domain.User">
    select tid, username, password, teachername, dno, power, intimes, lastlogin
        from teacher
        where username = #{username}
  </select>
  <select id="selectUserListLimit" resultType="xyz.shiguangliang.mybatis.domain.User">
    select tid, username, password, teachername, dno, power, intimes, lastlogin
    from teacher
    where
    /*條件判斷*/
    <if test="#{query} != null and #{query} != ''">
      /*模糊查詢*/
      <bind name="query2" value="'%' + query + '%'"/>
      username like #{query2}
    </if>
    LIMIT #{start},#{end}
  </select>
  <select id="selectUserListLimitSize" resultType="java.lang.Integer">
    select count(*)
    from teacher
    where
    /*條件判斷*/
    <if test="#{query} != null and #{query} != ''">
      /*模糊查詢*/
      <bind name="query2" value="'%' + query + '%'"/>
      username like #{query2}
    </if>
  </select>
</mapper>