搭建 SpringBoot 项目

news2024/9/20 14:52:24

创建 SpringBoot 项目

配置application.properties

根据自己数据库进行配置

spring.datasource.name=exam

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.url=jdbc:mysql://192.168.153.143:3306/exam

运行启动类

数据库配置完成

补齐目录

pojo层

Student.java

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class Student {
    private Integer id;
    private String name;
    private Integer age;
    private String gender;
    private String telephone;
    private String email;
    private Integer classId;
    private String className;
}

dao层

ExamDao.java

package nj.zb.kb21.springboot.dao;



import nj.zb.kb21.springboot.pojo.Classes;
import nj.zb.kb21.springboot.pojo.Student;
import org.springframework.stereotype.Repository;
import java.util.List;

@Repository
public interface ExamDao {

    List<Student> getAllStudent();

    Integer addStudent(Student student);

}

在启动类添加maScan注解

@MapperScan
作用：指定要变成实现类的接口所在的包，然后包下面的所有接口在编译之后都会生成相应的实现类
添加位置：是在Springboot启动类上面添加，

mappers层

ExamDao.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="nj.zb.kb21.springboot.dao.ExamDao">


    <insert id="addStudent">
        insert into exam.student
            (id, name, age, gender, telephone, email, classid)
        values (null, #{name}, #{age}, #{gender}, #{telephone}, #{email}, #{classId})

    </insert>

    <select id="getAllStudent" resultType="nj.zb.kb21.springboot.pojo.Student">
        select s.id,
               s.name,
               s.age,
               s.gender,
               s.telephone,
               s.email,
               s.classid,
               c.name classesName
        from exam.student s
                 left join classes c on s.classid = c.id
    </select>

</mapper>

在application.properities后添加配置

spring.datasource.name=exam

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.url=jdbc:mysql://192.168.153.143:3306/exam



mybatis.mapper-locations=classpath:/mappers/*.xml
//用于将配置路径下的*.xml文件加载到mybatis中

Service层

ExamService.java

public interface ExamService {

    /**
     * 查询所有学生信息及班级信息
     * @return
     */
    public List<Student> getAllStudent();

    /**
     * 添加新的学生信息
     * @param student
     * @return
     */
    public Integer addStudent(Student student);


}

ExamServiceImpl.java

@Service
@Transactional 
public class ExamServiceImpl implements ExamService {

    @Autowired
    private ExamDao examDao;

    @Override
    public List<Student> getAllStudent() {
        return examDao.getAllStudent();
    }

    @Override
    public Integer addStudent(Student student) {
        return examDao.addStudent(student);
    }

}

Controller层

ExamController.java

@Controller
@RequestMapping(value = "/exam")
public class ExamController {

    @Autowired
    private ExamService examService;

    @GetMapping("/allstu")
    @ResponseBody
    public List<Student> getAllStudent() {
        List<Student> allStudent = examService.getAllStudent();
        return allStudent;
    }

    @RequestMapping("addstu")
    @ResponseBody
    public Integer saveStudent(Student student) {
        Integer integer = examService.addStudent(student);
        return integer;
    }

}