package com.dayu.recharge.utils;

import java.io.FileInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class WSMD5 {
    private static final char HEX_DIGITS[] = {'0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};


    public static void main(String[] args) {
        getMD5Str("geiaginiig@2019");
    }


    /**
     * MD5 加密处理
     *
     * @param str
     * @return
     */
    public static String getMD5Str(String str) {

        try {
            MessageDigest messageDigest = null;
            try {
                messageDigest = MessageDigest.getInstance("MD5");
                messageDigest.reset();
                messageDigest.update(str.getBytes("UTF-8"));
            } catch (NoSuchAlgorithmException e) {
                System.out.println("NoSuchAlgorithmException caught!");
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            byte[] byteArray = messageDigest.digest();
            StringBuffer md5StrBuff = new StringBuffer();
            for (int i = 0; i < byteArray.length; i++) {
                if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
                    md5StrBuff.append("0").append(
                            Integer.toHexString(0xFF & byteArray[i]));
                else
                    md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
            }
            return md5StrBuff.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return str;
    }

    public static String getMD5Str(String str, String str2) {
        return getMD5Str(str + str2);
    }

    public static String toHexString(byte[] b) {
        StringBuilder sb = new StringBuilder(b.length * 2);
        for (int i = 0; i < b.length; i++) {
            sb.append(HEX_DIGITS[(b[i] & 0xf0) >>> 4]);
            sb.append(HEX_DIGITS[b[i] & 0x0f]);
        }
        return sb.toString();
    }

    public static String md5sum(String filename) {
        InputStream fis = null;
        byte[] buffer = new byte[1024];
        int numRead = 0;
        MessageDigest md5;
        try {
            fis = new FileInputStream(filename);
            md5 = MessageDigest.getInstance("MD5");
            while ((numRead = fis.read(buffer)) > 0) {
                md5.update(buffer, 0, numRead);
            }
            return toHexString(md5.digest());
        } catch (Exception e) {
            return "";
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}