import java.io.UnsupportedEncodingException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import org.springframework.util.StringUtils;

public class MD5 {

    private static final String ALGORITHM = "MD5";

    public MD5() {

    }

    /**md5的UTF-8编码加密.

    * @param text 待加密的文本

    * @return 加密后统一转成大写的文本

    * @version v1.0.0

     */

    public static String encrypt(String text) {

        byte[] hash;

        try {

            MessageDigest digest = MessageDigest.getInstance(ALGORITHM);

            hash = digest.digest(text.getBytes("UTF-8"));

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

            return null;

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

            return null;

        }

        StringBuilder hex = new StringBuilder(hash.length * 2);

        for (byte b : hash) {

            if ((b & 0xFF) < 0x10)

                hex.append("0");

            hex.append(Integer.toHexString(b & 0xFF));

        }

        String md5 = hex.toString();

        md5 = md5.toUpperCase();

        return md5;

    }

    /**md5的UTF-8编码加密.

    * @param text 待加密的文本

    * @param key 校验字符串

    * @return 加密后统一转成大写的文本

    * @version v1.0.0

     */

    public static String encrypt(String text, String key) {

       if(StringUtils.isEmpty(key)){

           return null;

       }

       return encrypt(new StringBuilder(text).append(key).toString());

    }

    public static void main(String args[]) {

        System.out.println(encrypt("中国", "123"));

        System.out.println(encrypt("12345611"));

        System.out.println(encrypt("123456","11"));

    }

}