java StringUtils

/**
 *
 */
package com.sign.utils;
import java.util.regex.Pattern;

/**
 * @author Administrator
 * create on 2015年6月3日
 *
 */

public class StringUtil {

    private static Pattern regidPattern = Pattern.compile("[\\w-]*");

    public static boolean isDigital(String str){
        Pattern p = Pattern.compile("(0|([1-9][0-9]*))(\\.[0-9]+)?");
        return p.matcher(str).matches();
    }

    public static boolean isChinese(String scr) {
        return !regidPattern.matcher(scr).matches();
    }

    /**
     *
     * @param s
     * @return
     */
    public static boolean isAllChinese(String s) {
          if (null == s || "".equals(s.trim())) return false;
          for (int i = 0; i < s.length(); i++) {
            if (!isChinese(s.charAt(i)))    return false;
          }
          return true;
    }

    /**
     *
     * @param s
     * @return
     */
    public static boolean isContainsChinese(String s){
          if (null == s || "".equals(s.trim())) return false;
          for (int i = 0; i < s.length(); i++) {
            if (isChinese(s.charAt(i)))    return true;
          }
          return false;
    }

    /**
     *
     * @param a char
     * @return boolean
     */
    public static boolean isChinese(char a) {
         int v = (int)a;
         return (v >=19968 && v <= 171941)||v==183;
    }

    /**
     *
     * @param input
     * @return String
     */
    public static final String escapeHTMLTag(String input) {
        if (input == null) {
            return "";
        }
        input = input.trim().replaceAll("&", "&amp;");
        input = input.trim().replaceAll("<", "&lt;");
        input = input.trim().replaceAll(">", "&gt;");
        input = input.trim().replaceAll("\t", "    ");
        input = input.trim().replaceAll("\r\n", "\n");
        input = input.trim().replaceAll("\n", "<br>");
        input = input.trim().replaceAll("  ", " &nbsp;");
        input = input.trim().replaceAll("'", "'");
        input = input.trim().replaceAll("\\\\", "\");
        return input;
    }

    public static String cleanHtmlTag(String htmlText) {
        String reg = "</?[a-z][a-z0-9]*[^<>]*>?";
        return htmlText.replaceAll(reg, "");
    }

    /**
     *
     *
     *
     * @param str
     * @return
     */
    public static String null2Trim(String str) {
        return str == null ? "" : str.trim();
    }

    public static String replaceXmlEntity(String xml){
        xml = xml.replaceAll("&amp;", "&");
        xml = xml.replaceAll("&quot;", "\"");
        xml = xml.replaceAll("&gt;", ">");
        xml = xml.replaceAll("&nbsp;", " ");
        xml = xml.replaceAll("&apos;", "'");
        return xml;
    }

    /**
     *
     *
     * @param Str
     * @return
     */
    public static boolean isEmpty(String str) {
        return !notEmpty(str);
    }

    /**
     *
     *
     * @param Str
     * @return
     */
    public static boolean notEmpty(String str) {
        if (str != null && str.trim().length() > 0)
            return true;
        return false;
    }

    public static void main(String[] argv)
    {
        boolean result = StringUtil.isDigital("0.1");

//        int length = StringUtil.getStringLength("呵呵a");

        int length = "呵呵".length();

        System.out.println(result);

        System.out.println(length);
    }
}