如何通过 curl o postman 测试 Spring Boot 一对多 JPA 发布请求

Question

在我的 spring boot 应用程序中，我有以下模型：-

@Entity
@Table(name = "STUDENT")
public class Student {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column
    private String name;

    @Column
    private int mobile;

    public Student() {

    }

    @JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "DEPT_ID", nullable = false)
    private Department department;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getMobile() {
        return mobile;
    }

    public void setMobile(int mobile) {
        this.mobile = mobile;
    }

    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", mobile=" + mobile +
                ", department=" + department +
                '}';
    }
}

    @Entity
@Table(name = "DEPARTMENT")
@JsonIdentityInfo(
        generator = ObjectIdGenerators.PropertyGenerator.class,
        property = "id")
public class Department {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column
    private String name;

    public Department() {

    }

    @JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
    @OneToMany(mappedBy = "department", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    private List<Student> studentList = new ArrayList<>();

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<Student> getStudentList() {
        return studentList;
    }

    public void setStudentList(List<Student> studentList) {
        this.studentList = studentList;
    }
}


@RestController
public class StudentController {

    @Autowired
    StudentService studentService;

    @Autowired
    DepartmentService departmentService;

    @RequestMapping(value = "/studentList", method = RequestMethod.GET)
    public @ResponseBody
    List<Student> getStudents(){
        return studentService.getStudents();
    }

    @PostMapping("/saveStudent/{deptName}")
    public String saveStudent(@RequestBody List<Student> studentList, @PathVariable String deptName){
        try {
            Department dept = departmentService.findDepartment(deptName.toUpperCase());

            for(Student student: studentList)
                student.setDepartment(dept);

            studentService.saveStudent(studentList);
            return "Student saved successfully..";
        }catch (Exception ex){
            ex.printStackTrace();
            return "Error in saving Student ..";
        }
    }
}

对于上述应用程序。我想测试它的后控制器localhost:8080 /saveStudent/hr
请注意，我已经保存了人力资源部门。我厌倦了 Postman 的 JSON：-

{
"student": [{ "name": "masi",
"mobile": 12345,
"department": "hr"
}, { "name": "masi2",
"mobile": 1234500,
"department": "hr"
}]
}

我收到以下错误：-

已解决 [org.springframework.http.converter.HttpMessageNotReadableException：JSON 解析错误：无法从 START_OBJECT 令牌中反序列化 java.util.ArrayList<com.example.onetomany.model.Student> 的实例；嵌套异常是 com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize of java.util.ArrayList<com.example.onetomany.model.Student> out of START_OBJECT token 在 [来源：（PushbackInputStream）；行：1，列：1]]

邮递员控制台日志：-

POST http://localhost:8080 /saveStudent/hr
400
183 ms
Network
Request Headers
Content-Type: application/json
User-Agent: PostmanRuntime/7.26.1
Accept: */*
Cache-Control: no-cache
Postman-Token: 57071c5d-e416-4b54-870a-9f318fee7166
Host: localhost:8080 
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Content-Length: 160
Request Body
Response Headers
Content-Type: application/json
Transfer-Encoding: chunked
Date: Wed, 15 Jul 2020 09:05:43 GMT
Connection: close
Response Body
{"timestamp":"2020-07-15T09:05:43.864+00:00","status":400,"error":"Bad Request","message":"","path":"/saveStudent/hr"}

我认为我的应用程序运行正常。如何通过 Postman 或 CURL 发出正确的 JSON 请求？

Answer 1

你不应该在帖子正文中添加student 像下面这样使用

 [
  {
    "name": "masi",
    "mobile": 12345,
    "department": {
      "field":"value"
    }
  },
  {
    "name": "masi2",
    "mobile": 1234500,
     "department": {
      "field":"value"
    }
  }
]

不知道系类的字段，请相应编辑