下滑线驼峰互转

public class HumpUtils {
    private static final Pattern linePattern = Pattern.compile("_(\w)");
    private static final Pattern humpPattern = Pattern.compile("[A-Z]");

    /**下划线转驼峰*/
    public static String lineHump(String str){
        str = str.toLowerCase();
        Matcher matcher = linePattern.matcher(str);
        StringBuffer sb = new StringBuffer();
        while(matcher.find()){
            matcher.appendReplacement(sb, matcher.group(1).toUpperCase());
        }
        matcher.appendTail(sb);
        return sb.toString();
    }
    /**驼峰转下划线*/
    public static String hump2Line(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();
    }
    public static void main(String[] args) {
        String lineToHump = lineHump("45hhf_parent_no_leader");
        System.out.println(lineToHump);
        System.out.println(hump2Line(lineToHump));
    }
}