md5加入指定的加密规则，进行加密

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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"));    }}
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