加密工具类MD5Util

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package com.yxb.base.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.lang.StringUtils;

public class MD5Util {
    public MD5Util() {
    }

    public static final String EncoderByMd5(String strKey) {
        char[] md5String = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

        try {
            byte[] btInput = strKey.getBytes();
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;

            for(int i = 0; i < j; ++i) {
                byte byte0 = md[i];
                str[k++] = md5String[byte0 >>> 4 & 15];
                str[k++] = md5String[byte0 & 15];
            }

            return new String(str);
        } catch (Exception var10) {
            return null;
        }
    }

    public static String encoderWithSalt(String str, String salt) {
        try {
            StringBuffer stingBuffer = new StringBuffer();
            MessageDigest digest = MessageDigest.getInstance("MD5");
            if (StringUtils.isBlank(salt)) {
                salt = "";
            }

            byte[] bs = digest.digest((str + salt).getBytes());
            byte[] var5 = bs;
            int var6 = bs.length;

            for(int var7 = 0; var7 < var6; ++var7) {
                byte b = var5[var7];
                int i = b & 255;
                String hexString = Integer.toHexString(i);
                if (hexString.length() < 2) {
                    hexString = "0" + hexString;
                }

                stingBuffer.append(hexString);
            }

            return stingBuffer.toString();
        } catch (NoSuchAlgorithmException var11) {
            var11.printStackTrace();
            return null;
        }
    }
}