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There is a newer version: 1.2.0

/**
 * 
 */
package titan.lightbatis.utils;

/**
 * @author [email protected]
 *
 */
public class NameUtils {

	 /**
     * 将驼峰风格替换为下划线风格
     */
    public static String camelhumpToUnderline(String str) {
        final int size;
        final char[] chars;
        final StringBuilder sb = new StringBuilder(
                (size = (chars = str.toCharArray()).length) * 3 / 2 + 1);
        char c;
        for (int i = 0; i < size; i++) {
            c = chars[i];
            if (isUppercaseAlpha(c)) {
                sb.append('_').append(toLowerAscii(c));
            } else {
                sb.append(c);
            }
        }
        return sb.charAt(0) == '_' ? sb.substring(1) : sb.toString();
    }
    

    public static boolean isUppercaseAlpha(char c) {
        return (c >= 'A') && (c <= 'Z');
    }

    public static boolean isLowercaseAlpha(char c) {
        return (c >= 'a') && (c <= 'z');
    }
    public static char toLowerAscii(char c) {
        if (isUppercaseAlpha(c)) {
            c += (char) 0x20;
        }
        return c;
    }
}