失败：缺少必需的请求正文：public springframework.http.

Question

我已经从 Web 创建了基于应用程序的示例：Angular 中的前端和 Spring Boot 的后端（mer 客户） Angular URL：http://localhost:4200/ Spring Boot URL：http://localhost:9020/（REST：http:// /本地主机:9020/api/ )

<h1>Angular Part </h1>

`export class Customer {

    id: number;

    firstname: number;

    lastname: Number;

    age: number;

    active: boolean;}`

和

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();}}

Answer 1

在Entity类中，该列名为“first_name”，但是当您创建表时，它以“firstname”命名，下划线消失了。