public static boolean isEmpty(final CharSequence cs) {
		return cs == null || cs.length() == 0;
	}
<p>
Checks if a CharSequence is empty ("") or null.
</p>

<pre>
StringUtils.isEmpty(null)      = true
StringUtils.isEmpty("")        = true
StringUtils.isEmpty(" ")       = false
StringUtils.isEmpty("bob")     = false
StringUtils.isEmpty("  bob  ") = false
</pre>

<p>
NOTE: This method changed in Lang version 2.0. It no longer trims the CharSequence.
That functionality is available in isBlank().
</p>
@param cs the CharSequence to check, may be null
@return {@code true} if the CharSequence is empty or null
@since 3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence)
spring-cloud-alibaba-starters/spring-cloud-alibaba-commons/src/main/java/com/alibaba/cloud/commons/lang/StringUtils.java