StrUtil.java

package cn.jfinalbbs.utils;

import com.jfinal.kit.StrKit;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by liuyang on 15/4/2.
 */
public class StrUtil extends StrKit {

    static final char[] hexDigits = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    static final char[] digits = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
    static final Random rand = new Random();
    static final String check = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";

    public static boolean isEmail(String email) {
        if(isBlank(email)) {
            return false;
        } else {
            Pattern pattern = Pattern.compile(check);
            Matcher matcher = pattern.matcher(email);
            return matcher.matches();
        }
    }

    public static String getUUID() {
        String uuid = UUID.randomUUID().toString();
        return uuid.replaceAll("-", "");
    }

    public static String randomString(int length) {
        StringBuffer sb = new StringBuffer();
        for (int loop = 0; loop < length; ++loop) {
            sb.append(hexDigits[rand.nextInt(hexDigits.length)]);
        }
        return sb.toString();
    }

    public static String randomNumber(int length) {
        StringBuffer sb = new StringBuffer();
        for (int loop = 0; loop < length; ++loop) {
            sb.append(digits[rand.nextInt(digits.length)]);
        }
        return sb.toString();
    }

    public static String getEncryptionToken(String token) {
        for (int i = 0; i < 6; i++) {
            token = EncryptionUtil.encoderBase64(token.getBytes());
        }
        return token;
    }

    public static String getDecryptToken(String encryptionToken) {
        for (int i = 0; i < 6; i++) {
            encryptionToken = EncryptionUtil.decoderBase64(encryptionToken.getBytes());
        }
        return encryptionToken;
    }

    public static String noHtml(String s){
        if(isBlank(s)) return "";
        else return s.replaceAll("<[.[^<]]*>","");
    }

    public static String transHtml(String s) {
        if(isBlank(s)) return "";
        else return s.replace("<", "<").replace(">", ">");
    }

    public static List<String> findAt(String str) {
        List<String> ats = new ArrayList<String>();
        String pattern = "[@]{1}([a-zA-Z0-9_\u4E00-\u9FA5]{1,})[ $]";
        Pattern regex = Pattern.compile(pattern);
        Matcher regexMatcher = regex.matcher(str);
        while (regexMatcher.find()) {
            ats.add(regexMatcher.group(1));
        }
        return ats;
    }

    public static void main(String[] args) {
        System.out.println(findAt("[@朋也](http://jfbbs.tomoya.cn/user/1a973292fc004c29bfc0d95045c1c340)"));
    }

}