Angular 5 + Spring Boot post 方法不起作用

Question

我使用 Angular 5 + Spring Boot。问题是我无法通过 post 方法将信息发送到我的休息控制器。 我没有从客户端或服务器端收到任何错误。 在代码下方，您将看到我使 get 方法正常工作。 让我为我的英语道歉。

弹簧实体 { Dish }

@Entity
@Table(name = "DISHES")
@Data
public class Dish implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private Long id;

    @Column(name = "NAME", unique = true)
    @NotNull(message = "Ястието трябва да има име.")
    @Size(min = 3, max = 30, message = "Името на ястието трябва да е между 3 и 30 символа.")
    private String name;

    @Column(name = "DESCRIPTION")
    @NotNull(message = "Описанието на ястието не може да е празно.")
    @Size(min = 3, max = 300, message = "Описанието на ястието трябва да е между 3 и 30 символа.")
    private String description;

    @JsonIgnore
    @OneToMany(cascade = CascadeType.ALL ,mappedBy = "dish")
    @JsonBackReference
    private List<DishCounter> dishCounters;
}

角度实体 {Dish}

export class Dish {

    constructor(public id?: number, public name?: string, public description?: string) {

    }
}

Spring Rest 控制器 {Dish}

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

    private static final Logger logger = LoggerFactory.getLogger(DishRestController.class);

    private final DishService dishService;

    @Autowired
    public DishRestController(final DishService dishService) {
        this.dishService = dishService;
    }

    @GetMapping("/all")
    public ResponseEntity<List<Dish>> getAllDishes() {
        logger.info("Rest controller find all dishes");
        List<Dish> dishes = dishService.getAllDishes();

        return ResponseEntity.status(HttpStatus.OK).body(dishes);
    }

    @PostMapping("/save")
    public ResponseEntity<Void> saveDish(@RequestBody Dish dish) {
        dishService.saveDish(dish);
        return new ResponseEntity<>(HttpStatus.OK);
    }
}

和 Angular 发布方法

 save(dish: Dish): Observable<Dish> {
        let result: Observable<Dish>;

        result = this.http.post(this.saveDishUrl, dish)
            .map((resp => {
                console.log(resp);
                return resp;
            }))
            .catch(e => {
                console.log(e);
                return Observable.throw(e);
            });

        console.log(result);

        return result;
    }

Answer 1

你在哪里调用 subscribe 的 post 功能？我在这里看不到。由于 http post 返回一个 observable，您必须订阅它才能进行调用。

http.post(....).subscribe(response => <DO SOMETHING WITH IT>);

Answer 2

这可能不是您代码中的所有错误，但这是我注意到的。

您的 Java @PostMapping 没有指定它应该接收什么以及它应该产生什么作为回报。

@PostMapping(value = "save", consumes = MediaType.APPLICATION_JSON_VALUE, 
    produces = MediaType.APPLICATION_JSON_VALUE)

对于 Angular 5，您使用的是 Angular 4 服务语法，我认为他们在 5 上更改了它。