是否有一个不被视为空白的隐形字符？ [英] Is there an invisible character that is not regarded as whitespace?

问题描述

我正在使用现有框架，如果满足某些条件，我必须将某个属性设置为空白。不幸的是，框架不允许仅将空格设置为属性值。具体来说，它确实

I am working with an existing framework where I have to set a certain attribute to blank if some conditions are satisfied. Unfortunately, the framework doesn't allow setting only whitespace to the attribute value. Specifically, it does a

！（org.apache.commons.lang.StringUtils.isBlank（value））检查值

是否有可能以某种方式绕过这个并设置一个看起来空白/不可见的值但不被视为空白的值？

Is it possible to somehow bypass this and set a value that looks blank/invisible to the eye but is not regarded as whitespace?

我现在正在使用短划线 - ，但我认为知道这是否有可能会很有趣。

I am using a dash "-" right now, but I think it would be interesting to know if it's possible.

推荐答案

尝试 Unicode字符'ZERO WIDTH SPACE'（U + 200B）。根据 WP：Whitespace＃Unicode

StringUtils.isBlank 不会打扰它：

public static boolean isBlank(String str) {
int strLen;
if (str == null || (strLen = str.length()) == 0) {
          return true;
     }
for (int i = 0; i < strLen; i++) {
     if ((Character.isWhitespace(str.charAt(i)) == false)) {
                   return false;
                }
         }
 return true;
  }

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