java实现驼峰和下划线相互转换

记录一波，工作使用到直接copy。

   /***
    * 

    * 将驼峰转为下划线
    * 
    * @param str
    * @return java.lang.String
    * @author comapss
    * @date 2022/5/9 0:01
    * @since 1.0.0
   **/
    public static String humpToUnderline(String str) {
        Pattern compile = Pattern.compile("[A-Z]");
        Matcher matcher = compile.matcher(str);
        StringBuffer sb = new StringBuffer();
        while(matcher.find()) {
            matcher.appendReplacement(sb,  "_" + matcher.group(0).toLowerCase());
        }
        matcher.appendTail(sb);
        return sb.toString();
    }

 /***
  * 

  * 将下划线转为驼峰
  * 
  * @param str
  * @return java.lang.String
  * @author comapss
  * @date 2022/5/9 0:01
  * @since 1.0.0
 **/
    public static String underlineToHump(String str) {
        str = str.toLowerCase();
        Pattern compile = Pattern.compile("_[a-z]");
        Matcher matcher = compile.matcher(str);
        StringBuffer sb = new StringBuffer();
        while(matcher.find()) {
            matcher.appendReplacement(sb,  matcher.group(0).toUpperCase().replace("_",""));
        }
        matcher.appendTail(sb);
        return sb.toString();
    }