【Java】MD5 加密

參考資料 ----
Android - how to encrypt a string?

 
public String md5(String s) 
{
    try 
    {
        // Create MD5 Hash
        MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
        digest.update(s.getBytes());
        byte messageDigest[] = digest.digest();

        // Create Hex String
        StringBuffer hexString = new StringBuffer();
        for(int i=0; i<messageDigest.length; i++)
        {
            hexString.append(Integer.toHexString(0xFF & messageDigest[i]));
        }
        return hexString.toString();
    } 
    catch (NoSuchAlgorithmException e) 
    {
        e.printStackTrace();
    }
    return "";
}