package com.zhgd.xmgl.util;

import lombok.extern.slf4j.Slf4j;

import java.security.MessageDigest;

@Slf4j
public class MD5 {

    // 全局数组
    private final static String[] strDigits = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    public MD5() {
    }

    // 返回形式为数字跟字符串
    private static String byteToArrayString(byte bByte) {
        int iRet = bByte;
        // log.info("iRet="+iRet);
        if (iRet < 0) {
            iRet += 256;
        }
        int iD1 = iRet / 16;
        int iD2 = iRet % 16;
        return strDigits[iD1] + strDigits[iD2];
    }

    // 返回形式只为数字
    private static String byteToNum(byte bByte) {
        int iRet = bByte;
        log.info("iRet1=" + iRet);
        if (iRet < 0) {
            iRet += 256;
        }
        return String.valueOf(iRet);
    }

    // 转换字节数组为16进制字串
    private static String byteToString(byte[] bByte) {
        StringBuffer sBuffer = new StringBuffer();
        for (int i = 0; i < bByte.length; i++) {
            sBuffer.append(byteToArrayString(bByte[i]));
        }
        return sBuffer.toString();
    }

    public static String GetMD5Code(String strObj) {
        String resultString = null;
        try {
            resultString = new String(strObj);
            MessageDigest md = MessageDigest.getInstance("MD5");
            // md.digest() 该函数返回值为存放哈希值结果的byte数组
            resultString = byteToString(md.digest(strObj.getBytes("UTF-8")));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return resultString;
    }

    public static void main(String[] args) {
        MD5 md5 = new MD5();
        log.info(md5.GetMD5Code("testapp_keytestfieldsnickformatxmlmethodtaobao.user.seller.getsessiontestsign_methodmd5timestamp2013-05-06 13:52:03v2.0test").toUpperCase());
    }
}