如何使用SpringMVC @Valid来验证POST中的字段，而不能验证PUT中的空字段 [英] How to use SpringMVC @Valid to validate fields in POST and only not null fields in PUT

问题描述

我们正在使用SpringMVC创建RESTful API，我们有一个/products端点，在其中可以使用POST来创建新产品，并使用PUT来更新字段.我们还使用javax.validation来验证字段.

We are creating a RESTful API with SpringMVC and we have a /products end point where POST can be used to create a new product and PUT to update fields. We are also using javax.validation to validate fields.

在POST中工作正常，但在PUT中，用户只能传递一个字段，而我不能使用@Valid，因此我将需要复制所有使用PUT的Java代码进行的注解验证.

In POST works fine, but in PUT the user can pass only one field, and I can't use @Valid, so I will need to duplicate all validations made with annotation with java code for PUT.

任何人都知道如何扩展@Valid批注并创建类似@ValidPresents之类的东西或解决我问题的其他东西吗?

Anyone knows how to extend the @Valid annotation and creating something like @ValidPresents or something else that solve my problem?

推荐答案

您可以将验证组与Spring org.springframework.validation.annotation.Validated批注一起使用.

You can use validation groups with the Spring org.springframework.validation.annotation.Validated annotation.

Product.java

Product.java

class Product {
  /* Marker interface for grouping validations to be applied at the time of creating a (new) product. */
  interface ProductCreation{}
  /* Marker interface for grouping validations to be applied at the time of updating a (existing) product. */
  interface ProductUpdate{}

  @NotNull(groups = { ProductCreation.class, ProductUpdate.class })
  private String code;

  @NotNull(groups = { ProductCreation.class, ProductUpdate.class })
  private String name;

  @NotNull(groups = { ProductCreation.class, ProductUpdate.class })
  private BigDecimal price;

  @NotNull(groups = { ProductUpdate.class })
  private long quantity = 0;
}

ProductController.java

ProductController.java

@RestController
@RequestMapping("/products")
class ProductController {
  @RequestMapping(method = RequestMethod.POST)
  public Product create(@Validated(Product.ProductCreation.class) @RequestBody Product product) { ... }

  @RequestMapping(method = RequestMethod.PUT)
  public Product update(@Validated(Product.ProductUpdate.class) @RequestBody Product product) { ... }
}

使用此代码，将在创建和更新时验证Product.code，Product.name和Product.price.但是，Product.quantity仅在更新时进行验证.

With this code in place, Product.code, Product.name and Product.price will be validated at the time of creation as well as update. Product.quantity, however, will be validated only at the time of update.

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