擅长:python、mysql、java
<p><a href="https://commons.apache.org/proper/commons-lang/">Apache ^{<cd1>}</a>对此有一些支持<a href="https://commons.apache.org/proper/commons-lang/javadocs/api-3.1/org/apache/commons/lang3/StringUtils.html#substring%28java.lang.String,%20int%29">in StringUtils</a>:</p>
<blockquote>
<p>Gets a substring from the specified String avoiding exceptions.</p>
<p>A negative start position can be used to start n characters from the end of the String </p>
</blockquote>
<p>不过,您仍然需要使用显式的开始索引。</p>