Java Md5加密字符串（32位）

 

 

     /**
     * MD5加密字符串
     *
     * @param str
     * @return
     * @throws NoSuchAlgorithmException
     * @throws UnsupportedEncodingException
     */
    public static String encoderByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        md5.update((str).getBytes("UTF-8"));
        byte b[] = md5.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));
        }

        return buf.toString();
    }