Question

Parts of the (Java, Spring-mvc, JSP) Form input is checked by Javascript. The rest is done by a custom Validator. The problem is when the Javascript validation is prevented, such an error may be printed:

Failed to convert property value of type java.lang.String to required type java.lang.Long for property xxx; nested exception is java.lang.NumberFormatException: For input string: "x"

是否有更好的办法处理转换问题。当贾瓦-瓦解者接手时,它已经遇到转换错误,或者现在还有可能加以核对?

编辑:主计长内部的协调人代码。

@InitBinder
public void initBinder(WebDataBinder binder) {
   SimpleDateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy");
   dateFormat.setLenient(false);

   binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
   binder.registerCustomEditor(Long.class, new CustomNumberEditor(Long.class, true));
}

但其真正公正的标准功能(org. Cerframework.beans.propertyeditors.CustomNumberEditor)和我认为必须有一个简单的解决办法,因为它似乎是一个共同的东西,可以长期反对某些杂质,并试图将其排除在外(或赶走)。

Answer 1

if someone s interested .. the code of the custom Binder that worked in the end follows..

  // prevent alphanumeric/special chars in numeric string (for backing field of type Long)
  binder.registerCustomEditor(Long.class, new CustomNumberEditor(Long.class, true) {
     @Override
     public void setAsText(String value) {
        if (value != null && !value.isEmpty() && CustomValidator.isNumeric(value)) {
           super.setAsText(value);
        } else {
           super.setAsText(null);
        }
     }
  });

虽然你仍然必须调整其验证方法,使其对所输入、移除和改成无效的案文具有意义。

Answer 2

Seems that you need to implement a binder in your controller to convert from String to Long. See if this thread helps, it gives you to code to convert String to Long.

Update

binder.registerCustomEditor(Long.class, "myFieldName", new  PropertyEditorSupprt(){
    @Override
    public void setValue(Object value) {
        if(value instanceof String)
           super.setValue(new Long(value));      
    }

});

友情链接