缺少所需的请求正文：public org.springframework.http.ResponseEntity<..model.Customer>

Posted 2023-02-26

【中文标题】缺少所需的请求正文：public org.springframework.http.ResponseEntity<..model.Customer>

【英文标题】：Required request body is missing: public org.springframework.http.ResponseEntity<..model.Customer>

【发布时间】：2020-03-04 09:16:38

【问题描述】：

基于来自 Web 的示例创建了两个应用程序：Angular 中的前端和客户） 角网址：http://localhost:4200/ Spring Boot URL：http://localhost:9020/（REST：http://localhost:9020/api/）

根据此处专家对我之前的问题 (https://***.com/posts/58685251) 的说明，我正面临新的例外情况，因为我无法自行解决。

角部分

export class Customer 
    id: number;
    firstname: string;
    lastname: string;
    age: number;
    active: boolean;

.

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);
        console.log(this.customer);
        this.submitted = true;,error => console.log(error));
    this.customer = new Customer();
    this.customer.firstname="HHH";



  onSubmit() 

    this.save();
  

.

import  Injectable  from '@angular/core';
import  HttpClient  from '@angular/common/http';
import  Observable  from 'rxjs';
import  Customer  from './customer';

@Injectable(
  providedIn: 'root'
)
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);
   return this.http.post(`$this.baseUrl` + `create`, customer);
  

  updateCustomer(id: number, value: any): Observable<Object> 
    return this.http.put(`$this.baseUrl/$id`, value);
  

  deleteCustomer(id: number): Observable<any> 
    return this.http.delete(`$this.baseUrl` + `customers/$id`,  responseType: 'text' );
  

  getCustomersList(): Observable<any> 
    return this.http.get(`$this.baseUrl` + `customers`);
  

  getCustomersByAge(age: number): Observable<any> 
    return this.http.get(`$this.baseUrl` + `customers/age/$age`);
  

  deleteAll(): Observable<any> 
    return this.http.delete(`$this.baseUrl` + `customers/delete`,  responseType: 'text' );
  

.

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

application.properties：

- 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

春季启动

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

  @Autowired
  CustomerRepository repository;

  @RequestMapping(value = "/create")
  public ResponseEntity<Customer> postCustomer(@RequestBody Customer customer) 
    try 
    LOG.setLevel(Level.ALL);
    LOG.info("public ResponseEntity<Customer> postCustomer(@RequestBody Customer customer");
    LOG.info("customer.getFirstName(): "+customer.getFirstName());
    //new Customer(customer.getId(),customer.getFirstName(),customer.getLastName(),customer.getAge(),customer.isActive())
      Customer _customer = repository.save(customer);
      return new ResponseEntity<>(_customer, HttpStatus.CREATED);
     catch (Exception e) 
      return new ResponseEntity<>(null, HttpStatus.EXPECTATION_FAILED);
    
  

.

@ResponseBody
@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 = "lastname")
    private String lastname;

    @Column(name = "firstname")
    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;
    

    @Override
    public String toString() 
        String info = String.format("Customer info: id = %d, firstname = %s, lastname = %s, age = %d", firstname,
                lastname, age, id);
        return info;
    

预期结果是坚持使用正确的名字和姓氏的客户，但我得到了例外：

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu Nov 07 17:53:03 CET 2019
There was an unexpected error (type=Bad Request, status=400).
Required request body is missing: public org.springframework.http.ResponseEntity<.model.Customer> .controller.CustomerController.postCustomer(model.Customer)
org.springframework.http.converter.HttpMessageNotReadableException: Required request body is missing: public org.springframework.http.ResponseEntity<model.Customer> .controller.CustomerController.postCustomer(com.javasampleapproach.mysql.model.Customer)
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:160)
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:130)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:127)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)

【问题讨论】：

能否请您从Customer 实体类中删除@ResponseBody？

在这种情况下，我没有得到异常，但字段 lastname 和 fristname 仍然为空，尽管我添加了字符串：`"id":42,"age":99,"active":true,"姓氏":null,"firstName":null``

把@RequestMapping(value = "/create")改成@PostMapping(value = "/create")

嗨@reflexdemon 不幸的是没有改进

嗨@reflexdemon 我直到现在才能解决这个问题。我仍然是例外：Sun Nov 10 21:19:14 CET 2019 There was an unexpected error (type=Method Not Allowed, status=405). Request method 'GET' not supported org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'GET' not supported at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:200)

【参考方案1】：

尝试这样做：

 @RequestMapping(value = "/create")
    public ResponseEntity<Customer> postCustomer(@RequestBody Customer customer) 
        try 
            LOG.setLevel(Level.ALL);
            LOG.info("public ResponseEntity<Customer> postCustomer(@RequestBody Customer customer");
            LOG.info("customer.getFirstName(): "+customer.getFirstName());
            //new Customer(customer.getId(),customer.getFirstName(),customer.getLastName(),customer.getAge(),customer.isActive())
            Customer _customer = repository.save(customer);
            return new ResponseEntity<Customer>(_customer, HttpStatus.CREATED);
         catch (Exception e) 
            return new ResponseEntity<Customer>(null, HttpStatus.EXPECTATION_FAILED);
        
    

【参考方案2】：

只有当你返回 ResponseEntity :

时你才会这样做

   @RequestMapping(value = "$jwt.route.registration.path", method = RequestMethod.POST)
   public ResponseEntity<User> registration(@RequestBody ExternalUser externalUser)
       System.out.println(externalUser.getUsername());
   User userInstance=((JwtUserDetailsService)userDetailsService).saveUser(externalUser);
   return new ResponseEntity<User>(userInstance,HttpStatus.OK);
    

【讨论】：

嗨@LingarajSahoo 为什么我需要注册？在我的应用中，我没有安全元素

我举了一个responseEntity怎么写的例子

嗨@LingarajSahoo，仍然面临同样的问题:(

嗨@LingarajSahoo，仍然面临同样的问题:( Whitelabel 错误页面此应用程序没有/error 的显式映射，因此您将其视为后备。CET 11 月 7 日星期四 20:02:58 2019 出现意外错误（type=Bad Request, status=400）。缺少必需的请求正文：public org.springframework.http.ResponseEntity

那么你不返回 null 你只返回 -> 返回新的 ResponseEntity(HttpStatus.EXPECTATION_FAILED);