Spring MVC验证：至少需要一个字段。至少需要一个字段

I do a search by criteria with an DTO entity for filter in the front-end of my application:

我按照DTO实体的标准搜索我的应用程序前端的过滤器:

public class MyFilter implements Serializable {

    private static final long serialVersionUID = 1L;
    private String name;
    @Enumerated(EnumType.STRING)
    private AccessType accessType;
    private List<MyType> userType;
    private List<OfficeLocation> officeLocation;
    private List<Language> languages;
    private String country;

}

and getters and setters.

和吸气剂和二传手。

In my controller:

在我的控制器中:

@RequestMapping
public ModelAndView list(@ModelAttribute("filter") MyFilter myFilter, BindingResult result) {        
    final ModelAndView mav = new ModelAndView("list");
    // validate
    MyFilterValidator.validate(myFilter, result);
    mav.addObject("filter", myFilter);
    if (result.hasErrors()) {
        return mav;
    }
    // ...
    return mav;
}

I want to validate the search form filter by a validator class:

我想通过验证器类验证搜索表单过滤器:

public class MyFilterValidator implements org.springframework.validation.Validator {

公共类MyFilterValidator实现org.springframework.validation.Validator {

@Override
public void validate(Object object, Errors errors) {
    final MyFilter myFilter = (MyFilter) object;

    if (myFilter == null) {
        errors.reject("error.one.field.required");
    } else {
        if (StringUtils.isEmpty(myFilter.getName()) && myFilter.getAccessType() == null
                && myFilter.getUserType() == null && myFilter.getLanguages() == null
                && StringUtils.isEmpty(myFilter.getCountry())
                && myFilter.getOfficeLocation() == null) {
            errors.reject("error.one.field.required");
        }
    }
}

@Override
public boolean supports(Class inClass) {
    return MyFilter.class.equals(inClass);
}

}

I need to validate if one field is filled, minimum one field of my Filter class is filled. How can I do that in a simple way? I need to check each attribute : StringUtils.isEmpty or .size()<=0, ... ? Is it possible to iterate over each property and check if one of them is not null? To know if one field is fill?

我需要验证是否填充了一个字段,填充了我的Filter类的最小一个字段。我怎么能以简单的方式做到这一点?我需要检查每个属性:StringUtils.isEmpty或.size()<= 0,...?是否可以迭代每个属性并检查其中一个属性是否为空?要知道一个字段是否填满?

1 个解决方案

#1

If you need this test very often, then it would be worth to implement a small function that inspect some annotated fields of the DAO by reflection.

如果您经常需要此测试,那么实现一个小函数是值得的,该函数通过反射检查DAO的一些带注释的字段。

public DAO {
   public String nevermind;

   @AtLeastOneOfThem
   public String a; 

   @AtLeastOneOfThem
   public String b; 
}

/**
  * Return True if at least on of the fields annotated by @AtLeastOneOfThem
  * is not Empty. 
  * THIS IS PSEUDO CODE!
  */
public static boolean atLeastOneOfThemIsNotEmpty(Object o) {
   for(Field field : getFieldsAnnotatedWith(AtLeastOneOfThem.class, o) {
      if (field.get() != null && !field.get().empty()) {
         return true;
      }
   }
   return false;
}

If this is too much work, then it would be the fastet way to implment the check in the tradtional handwritten way.

如果这是太多的工作,那么这将是以传统的手写方式实施支票的紧固方式。

#1