我已经很长时间没有做任何编程相关的事情了（5天），现在我很愚蠢

代码

inMemoryStudentServiceImpl.java

package com.justdeax.coursepractice.Student;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
@AllArgsConstructor
public class inMemoryStudentServiceImpl implements StudentService {
    private final StudentDao repo;
    @Override
    public List<Student> findAll() {
        return repo.findAll();
    }
    @Override
    public Student saveStudent(Student student) {
        return repo.saveStudent(student);
    }
    @Override
    public Student findByEmail(String email) {
        return repo.findByEmail(email);
    }
    @Override
    public Student updateStudent(Student student) {
        return repo.updateStudent(student);
    }
    @Override
    public void deleteStudent(String email) {
        repo.deleteStudent(email);
    }
}

字符串

StudentController.java

package com.justdeax.coursepractice.Student;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/api/v1/students")
@RequiredArgsConstructor
public class StudentController {
    @NonNull
    private final StudentService services;
    @GetMapping
    public List<Student> findAll() {
        return services.findAll();
    }
    @PostMapping("save_student")
    public Student saveStudent(Student student) {
        return services.saveStudent(student);
    }
    @GetMapping("/{email}")
    public Student findByEmail(@PathVariable String email) {
        return services.findByEmail(email);
    }
    @PutMapping("update_student")
    public Student updateStudent(Student student) {
        return services.updateStudent(student);
    }
    @DeleteMapping("delete_student/{email}")
    public void deleteStudent(@PathVariable String email) {
        services.deleteStudent(email);
    }
}

型

StudentService.java

package com.justdeax.coursepractice.Student;  
import java.util.List;  
public interface StudentService {  
    List<Student> findAll();  
    Student saveStudent(Student student);  
    Student findByEmail(String email);  
    Student updateStudent(Student student);  
    void deleteStudent(String email);  
}

型

Student.java

package com.justdeax.coursepractice.Student;  
import lombok.*;  
import java.time.LocalDate;  
@Data  
@Builder  
public class Student {  
    private String firstName;  
    private String lastName;  
    private Integer age;  
    private LocalDate dataOfBirth;  
    private String email;  
}

型

StudentDao.java

package com.justdeax.coursepractice.Student;  
import org.springframework.stereotype.Repository;  
  
import java.util.ArrayList;  
import java.util.List;  
import java.util.stream.IntStream;  
  
@Repository  
public class StudentDao {  
    private final List<Student> STUDENTS = new ArrayList<>();  
    public List<Student> findAll() {  
        return STUDENTS;  
    }  
  
    public Student saveStudent(Student student) {  
        STUDENTS.add(student);  
        return student;  
    }  
  
    public Student findByEmail(String email) {  
        return STUDENTS.stream()  
                .filter(e -> e.getEmail().equals(email))  
                .findFirst()  
                .orElse(null);  
    }  
  
    public Student updateStudent(Student student) {  
        var studentIndex = IntStream.range(0, STUDENTS.size())  
                .filter(i -> STUDENTS.get(i).getEmail().equals(student.getEmail()))  
                .findFirst()  
                .orElse(-1);  
        if (studentIndex > -1) {  
            STUDENTS.set(studentIndex, student);  
            return student;  
        }  
        return null;  
    }  
  
    public void deleteStudent(String email) {  
        var student = findByEmail(email);  
        if (student != null) STUDENTS.remove(student);  
    }  
}

型

使用次数：

• Lombok岛
• Sping Boot Starter Web
• Spring Boot 起动器测试

你的名字：

POST请求时：localhost：8080/API/v1/students/保存_student这个json是这样写的：

{
    "firstName": "abc",
    "lastName": "def",
    "age": "99",
    "dataOfBirth": "1000-10-10",
    "email": "[email protected]"
}

型
在这个请求之后，响应输出为相同的json，但到处都是null，为什么？

{
    "firstName": null,
    "lastName": null,
    "age": null,
    "dataOfBirth": null,
    "email": null
}

型