如何在 Spring 中配置对 @Valid 的直接字段访问？

Question

如何spring-web在不必使用 getter/setter 的情况下验证我的 dto？

@PostMapping(path = "/test")
public void test(@Valid @RequestBody WebDTO dto) {

}

public class WebDTO {
   @Valid //triggers nested validation
   private List<Person> persons;

   //getter+setter for person

   @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY)
   public static class Person {
         @NotBlank
         public String name;
         public int age;
   }
}

结果：

"java.lang.IllegalStateException","message":"JSR-303 validated property 
    'persons[0].name' does not have a corresponding accessor for Spring data 
    binding - check your DataBinder's configuration (bean property versus direct field access)"}

特殊要求：我仍然想添加@AssertTrue布尔 getter 来提供跨域验证，例如：

    @AssertTrue
    @XmlTransient
    @JsonIgnore
    public boolean isNameValid() {
        //...
    }

Answer 1

您必须配置 Spring DataBinder 才能使用直接字段访问。

@ControllerAdvice    
public class ControllerAdviceConfiguration {
    @InitBinder
    private void initDirectFieldAccess(DataBinder dataBinder) {
        dataBinder.initDirectFieldAccess();
    }
}