java MD5

public static final String EncoderPwdByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException { 

 　MessageDigest md5 = MessageDigest.getInstance("MD5");

　　BASE64Encoder base64en = new BASE64Encoder();

　　String newstr = base64en.encode(md5.digest(str.getBytes("utf-8")));

　　return newstr;

}