设计和实现一个简单的基于SpringBoot技术实现的学生信息管理系统，系统可以对学生信息进行基本的增加、修改、删除和查询功能；学生信息的字段有主键ID、学号、姓名、性别、出生年月、年级、班级名、系名。程序的实现步骤要写清楚，程序的代码要注释明白。

实现步骤：

1. 创建Spring Boot项目

2. 导入相关依赖

   <!--Spring Boot Web-->
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   
   <!--Spring Boot Mybatis-->
   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>2.1.3</version>
   </dependency>
   
   <!--MySQL JDBC Driver-->
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>8.0.21</version>
   </dependency>
   
   <!--Lombok-->
   <dependency>
       <groupId>org.projectlombok</groupId>
       <artifactId>lombok</artifactId>
       <version>1.18.12</version>
   </dependency>
   
   <!--Swagger-->
   <dependency>
       <groupId>io.springfox</groupId>
       <artifactId>springfox-swagger2</artifactId>
       <version>2.9.2</version>
   </dependency>
   <dependency>
       <groupId>io.springfox</groupId>
       <artifactId>springfox-swagger-ui</artifactId>
       <version>2.9.2</version>
   </dependency>

3. 创建数据库

   CREATE DATABASE student_info;
   
   USE student_info;
   
   CREATE TABLE student (
     id INT(11) PRIMARY KEY AUTO_INCREMENT,
     student_no VARCHAR(20) NOT NULL,
     name VARCHAR(20) NOT NULL,
     gender VARCHAR(10) NOT NULL,
     birthday DATE NOT NULL,
     grade VARCHAR(20) NOT NULL,
     class_name VARCHAR(20) NOT NULL,
     department VARCHAR(20) NOT NULL
   );

4. 配置application.yml文件

   server:
     port: 8080
   
   spring:
     datasource:
       url: jdbc:mysql://localhost:3306/student_info?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8
       username: root
       password: root
       driver-class-name: com.mysql.cj.jdbc.Driver
   
   mybatis:
     mapper-locations: classpath:mapper/*.xml
     type-aliases-package: com.example.demo.entity
   
   swagger:
     title: 学生信息管理系统API文档
     description: 学生信息管理系统API文档
     version: 1.0
     contact:
       name: Lony
       email: lony@example.com
       url: https://www.example.com

5. 创建实体类

   @Data
   public class Student {
       private int id;
       private String studentNo;
       private String name;
       private String gender;
       private Date birthday;
       private String grade;
       private String className;
       private String department;
   }

注意：使用Lombok的@Data注解可以自动生成getter、setter、toString等方法。

6. 创建Mapper接口

   @Mapper
   public interface StudentMapper {
       List<Student> getAllStudents();
   
       Student getStudentById(int id);
   
       int addStudent(Student student);
   
       int updateStudent(Student student);
   
       int deleteStudent(int id);
   }

注意：使用@Mapper注解标注Mapper接口，Mybatis会自动生成Mapper实现类。

7. 创建Mapper的XML文件

   <?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="com.example.demo.mapper.StudentMapper">
       <select id="getAllStudents" resultType="com.example.demo.entity.Student">
           SELECT * FROM student
       </select>
   
       <select id="getStudentById" parameterType="int" resultType="com.example.demo.entity.Student">
           SELECT * FROM student WHERE id = #{id}
       </select>
   
       <insert id="addStudent" parameterType="com.example.demo.entity.Student" useGeneratedKeys="true" keyProperty="id">
           INSERT INTO student(student_no, name, gender, birthday, grade, class_name, department)
           VALUES (#{studentNo}, #{name}, #{gender}, #{birthday}, #{grade}, #{className}, #{department})
       </insert>
   
       <update id="updateStudent" parameterType="com.example.demo.entity.Student">
           UPDATE student
           SET student_no = #{studentNo}, name = #{name}, gender = #{gender}, birthday = #{birthday}, grade = #{grade}, class_name = #{className}, department = #{department}
           WHERE id = #{id}
       </update>
   
       <delete id="deleteStudent" parameterType="int">
           DELETE FROM student WHERE id = #{id}
       </delete>
   </mapper>

注意：使用Mybatis的XML文件来定义SQL语句。

8. 创建Service接口和实现类

   public interface StudentService {
       List<Student> getAllStudents();
   
       Student getStudentById(int id);
   
       int addStudent(Student student);
   
       int updateStudent(Student student);
   
       int deleteStudent(int id);
   }
   
   @Service
   public class StudentServiceImpl implements StudentService {
       @Autowired
       private StudentMapper studentMapper;
   
       @Override
       public List<Student> getAllStudents() {
           return studentMapper.getAllStudents();
       }
   
       @Override
       public Student getStudentById(int id) {
           return studentMapper.getStudentById(id);
       }
   
       @Override
       public int addStudent(Student student) {
           return studentMapper.addStudent(student);
       }
   
       @Override
       public int updateStudent(Student student) {
           return studentMapper.updateStudent(student);
       }
   
       @Override
       public int deleteStudent(int id) {
           return studentMapper.deleteStudent(id);
       }
   }

注意：使用@Service注解标注Service实现类，通过@Autowired注解注入Mapper。

9. 创建Controller

   @RestController
   @RequestMapping("/student")
   public class StudentController {
       @Autowired
       private StudentService studentService;
   
       @GetMapping("/getAllStudents")
       public List<Student> getAllStudents() {
           return studentService.getAllStudents();
       }
   
       @GetMapping("/getStudentById/{id}")
       public Student getStudentById(@PathVariable("id") int id) {
           return studentService.getStudentById(id);
       }
   
       @PostMapping("/addStudent")
       public String addStudent(@RequestBody Student student) {
           int result = studentService.addStudent(student);
           if (result > 0) {
               return "添加成功";
           } else {
               return "添加失败";
           }
       }
   
       @PutMapping("/updateStudent")
       public String updateStudent(@RequestBody Student student) {
           int result = studentService.updateStudent(student);
           if (result > 0) {
               return "修改成功";
           } else {
               return "修改失败";
           }
       }
   
       @DeleteMapping("/deleteStudent/{id}")
       public String deleteStudent(@PathVariable("id") int id) {
           int result = studentService.deleteStudent(id);
           if (result > 0) {
               return "删除成功";
           } else {
               return "删除失败";
           }
       }
   }

注意：使用@RestController注解标注Controller，通过@Autowired注解注入Service。

10. 启动应用，访问http://localhost:8080/swagger-ui.html可以查看API文档。

代码注释见代码：https://github.com/LonyYoung/Spring-Boot-Demo/tree/master/student-info-management-system