MD5加密

MD5加密

/**
     * MD5 加密  为32位或16位的16进制字符串（默认为32位） 
     * @param str
     * @param type 32-32位 16-16位
     * @return
     */
    public static String encryptMD5(String str,String type) {
        MessageDigest messageDigest = null;
        try {   
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();   
            messageDigest.update(str.getBytes("UTF-8"));   
        } catch (NoSuchAlgorithmException e) {
            System.out.println("NoSuchAlgorithmException caught!");
            System.exit(-1);
        } 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]));
        }  
        if (type.equals("16")) {
            return md5StrBuff.toString().substring(8,24);  
        }else {
            return md5StrBuff.toString();  
        } 
    }