MD5加密

MD5加密后转为小写16进制

public static String Md5(String plainText) {
        StringBuffer buf = new StringBuffer("");
        String result;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(plainText.getBytes());
            byte b[] = md.digest();
            int i;

            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            byte[] bytes = new String(buf).getBytes();
            result = DatatypeConverter.printHexBinary(bytes);

        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        return result;
    }

MD5加密后转为小写32进制

public static String encryption(String plainText) {
        String re_md5 = new String();
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(plainText.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            re_md5 = buf.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return re_md5;
    }