将驼峰命名转为下划线名称

private static Pattern humpPattern = Pattern.compile("[A-Z]");

// 将驼峰命名转为下划线名称
public static String humpToLine(String str) {
    Matcher matcher = humpPattern.matcher(str);
    StringBuffer sb = new StringBuffer();
    while (matcher.find()) {

        matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());
    }
    matcher.appendTail(sb);
    return sb.toString();
}