在Spring MVC中将表单值设置为NULL而不是空字符串 [英] Form values to be NULL instead of empty strings in Spring MVC

问题描述

我正在使用Spring MVC.我的页面上有一个表格.当我不向表单输入任何值并提交表单时，它带有空字符串"".

I am using Spring MVC. I have a form on my page. When I do not enter any values to the form and submit it, it comes with empty strings "".

是否可以设置null值而不是空字符串?

Is it possible to set null value instead of empty strings?

预先感谢您的帮助.

推荐答案

您必须使用.您必须将此添加到您的控制器中.

You have to use the @InitBinder annotation because in Spring MVC it always returns "" for the blank values in a form. You have to add this in your controller.

示例:

@InitBinder    /* Converts empty strings into null when a form is submitted */
public void initBinder(WebDataBinder binder) {  
    binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));  
}

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