SpringBoot学习

一、项目配置和依赖

　　1、通过Spring Initializr生成项目，将项目压缩包解压，打开Eclipse，选择import->Existing Maven Projects导入项目；

　　2、打开pom.xml添加依赖项

<dependencies>
　　　　　 <!-- 添加jpa依赖 -->
         <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
　　　　  <!-- 添加thymeleaf依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
　　　　  <!-- 添加web依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
　　　　  <!-- 添加mysql依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
　　　　  <!-- 添加test依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

　　~JPA(Java Persistence Api)是JDK5.0注解或XML描述对象，并将运行期的实体对象持久化到数据库中

　　~Thymeleaf是一个模板引擎，可以完全替代JSP

二、实体类

　　创建一个Student实体类（放在Entity包中）

@Entity　　//声明类为实体
public class Student {
    @Id　　//指定的类的属性，用于识别（一个表中的主键）
    @GeneratedValue　　//指定如何标识属性可以被初始化
    private Integer stuID;
    private String stuName;
    private String stuPhone;
    private String stuAddress;

    public Integer getStuID() {
        return stuID;
    }

    public void setStuID(Integer stuID) {
        this.stuID = stuID;
    }

    public String getStuName() {
        return stuName;
    }

    public void setStuName(String stuName) {
        this.stuName = stuName;
    }

    public String getStuPhone() {
        return stuPhone;
    }

    public void setStuPhone(String stuPhone) {
        this.stuPhone = stuPhone;
    }

    public String getStuAddress() {
        return stuAddress;
    }

    public void setStuAddress(String stuAddress) {
        this.stuAddress = stuAddress;
    }

}

三、Repository

　　在repository包中编写一个StudentRepository接口，继承JpaRepository

public interface StudentRepository extends JpaRepository<Student, Integer>{

}

四、实体类服务

 　　编写一个接口StudentService（放在service包中），接口中定义学生服务

public interface StudentService {

    //添加学生信息
    Student addStudent(Student student);
    
    //返回所有学生信息
    List<Student> getAllStudent();
    
    //修改学生信息
    Student updateStudent(Student student);
    
    //删除学生信息
    void deleteStudent(Integer stuId);
    
    //查询学生信息
    Student getStudentByID(Integer stuID);
    
}

五、实体类服务的实现

　　编写StudentServiceImpl类实现StudentService接口中的方法（放在serviceImpl包中）

@Service
public class StudentServiceImpl implements StudentService{
    @Autowired
    private StudentRepository studentRepository;
    
    @Override
    public Student addStudent(Student student) {
        return studentRepository.save(student);
    }
    
    @Override
    public List<Student> getAllStudent(){
        return studentRepository.findAll();
    }
    
    @Override
    public Student updateStudent(Student student) {
        return studentRepository.save(student);
    }
    
    @Override
    public void deleteStudent(Integer stuId) {
        studentRepository.deleteById(stuId);
    }
    
    @Override
    public Student getStudentByID(Integer stuID) {
        return studentRepository.findById(stuID).get();
    }
}

六、Controller

　　在StudentController写入以下代码，实现学生服务

@RestController
@RequestMapping("/stu")
public class StudentController {

    @Autowired
    private StudentService studentService;
    
    @RequestMapping("/test")
    private String test() {
        return "测试";
    }
    
    @PostMapping("/add")
    private Student addStudent (Student student) {
        return studentService.addStudent(student);
    }
    
    @GetMapping("/all")
    private List<Student> getAllStu(){
        return studentService.getAllStudent();
    }
    
    @GetMapping("/getbyid/{id}")
    private Student getStuByStuId(@PathVariable("id") Integer stuId) {
        return studentService.getStudentByID(stuId);
    }
    
    @PutMapping("/updatestu")
    private Student updateStudent(Student student) {
        return studentService.updateStudent(student);
    }
    
    @DeleteMapping("/deletestu/{id}")
    private void deleteStuById(@PathVariable("id") Integer stuId) {
        studentService.deleteStudent(stuId);
    }
    
}