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

/**
 * 驼峰转下划线,最后转为大写
 * @param str
 * @return
 */
public static String humpToLine(String str) {
    Matcher matcher = humpPattern.matcher(str);
    StringBuffer sb = new StringBuffer();
    while (matcher.find()) {
        matcher.appendReplacement(sb, "_" + matcher.group(0).toUpperCase());
    }
    matcher.appendTail(sb);
    return sb.toString().toUpperCase();
}

/**
 * 下划线转驼峰,正常输出
 * @param str
 * @return
 */
public static String lineToHump(String str) {
    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();
}