Java 失败：缺少必需的请求正文：public springframework.http.ResponseEntity…postController

我从Web创建了基于应用程序的示例：Angular中的前端和Spring Boot中的后端 （客户） 角度URL： Spring启动URL:（REST:）

应用程序。属性：

• server.port=9020
• spring.datasource.url=jdbc:h2:file:./testdb
• spring.datasource.username=H2 spring.datasource.password=password
• spring.jpa.hibernate.ddl-auto=update
• spring.jpa.show sql=true`
  有效负载{“id”：518，“lastName”：null，“firstName”：null，“age”：99，“active”：true} 因为我输入了字符串，所以lastName和firstName应该是字符串值
  :

---

在实体类中，列名为“first_name”，但当您创建表时，它用“firstname”命名，下划线消失了。

这里有什么错？很明显，我输入的值导致numberformat异常。知道吗？看看错误。它准确地告诉您出了什么问题：spring试图将字符串“create”转换为Java

long

类型。这可能意味着您正试图在第二个代码段中的

getCustomer（）

函数中创建id为“create”的客户。跟踪对此函数的调用，并确保传递的是数字类型。POST:{“active”：true，“age”：55，“firstname”：“Test”，“lastname”：“Test”}结果{“id”：591，“lastname”：null，“firstname”：null，“age”：55，“active”：true}有什么想法吗？更改后：我遇到了以下错误：

Method Create Customer@RequestMapping（value=“/Create”）public ResponseEntity postCustomer（@RequestBody Customer-Customer）缺少所需的请求正文：public org.springframework.http.ResponseEntity Customer-controller.postCustomer（Customer）org.springframework.http.converter.httpmessagenetradableexception:缺少必需的请求正文：public org.springframework.http.ResponseEntity Customer controller.postCustomer（Customer）

附上我关于我需要帮助的帖子。你知道我做错了什么吗？

<h1>Angular Part </h1>

`export class Customer {
    id: number;
    firstname: number;
    lastname: Number;
    age: number;
    active: boolean;}`

import { Customer } from './customer';
    export class CustomerService {
      private baseUrl = http://localhost:9020/api';

      constructor(private http: HttpClient) { }

     getCustomer(id: number): Observable<Object> {
        return this.http.get(${this.baseUrl}+`/customers`+/${id});}

      createCustomer(customer: Customer): Observable<Object> {
        console.log("customer.lastname: "+customer.lastname);
        console.log("customer.firstname: "+customer.firstname);
        return this.http.post(${this.baseUrl} + `/create`, customer);
      }
      getCustomersList(): Observable<any> {
        return this.http.get(${this.baseUrl}+`/customers`);
      }
    }


    import { Component, OnInit } from '@angular/core';
    import { Customer } from '../customer';
    import { CustomerService } from '../customer.service';`

    @Component({
      selector: 'create-customer',
      templateUrl: './create-customer.component.html',
      styleUrls: ['./create-customer.component.css']
    })

    export class CreateCustomerComponent implements OnInit {
      customer: Customer = new Customer();
      submitted = false;
      constructor(private customerService: CustomerService) { }
      ngOnInit() {
      }

      newCustomer(): void {
        this.submitted = false;
        this.customer = new Customer();
      }

      save() {
        this.customerService.createCustomer(this.customer)
          .subscribe(data => {console.log(data);
            this.submitted = true;},error => console.log(error));
            this.customer = new Customer();}

      onSubmit() {   
        this.save();}}

@Entity
@Table(name = "customer")
public class Customer implements Serializable {

    private static final long serialVersionUID = -3009157732242241606L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Column(name = "last_Name")
    private String lastName;

    @Column(name = "first_Name")
    private String firstName;

    @Column(name = "age")
    private int age;

    @Column(name = "active")
    private boolean active = true;

    public Customer() {
    }

    public Customer(String firstName, String lastName, int age, boolean active) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = age;
        this.active=active;
}

    public long getId() {
        return id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getLastName() {
        return this.lastName;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getAge() {
        return this.age;
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }
}

@CrossOrigin(origins = "http://localhost:4200")
@RestController
@RequestMapping("/api")
public class CustomerController {

  @Autowired
  CustomerRepository repository;


  @PostMapping(value = "/create")
  public ResponseEntity<Customer> postCustomer(@RequestBody Customer customer) {
    try {
      Customer _customer = repository.save(new Customer(customer.getFirstName(),customer.getLastName(),customer.getAge(),customer.isActive()));
      return new ResponseEntity<>(_customer, HttpStatus.CREATED);
    } catch (Exception e) {
      return new ResponseEntity<>(null, HttpStatus.EXPECTATION_FAILED);
    }
  }
}

CREATE TABLE customer(
       id INT NOT NULL AUTO_INCREMENT,
       firstname VARCHAR(20) NOT NULL,
       lastname VARCHAR(20) NOT NULL,
       PRIMARY KEY (id));