long startTime=System.currentTimeMillis();

long costTime = System.currentTimeMillis() - startTime;

* in spring  you can use api whcih calculate in nano seconds
 

 

public static String replace(String orig, String from, String to)

{

int start = orig.indexOf(from);

if(start == -1)

return orig;

int lf = from.length();

char[] origChars = orig.toCharArray();

StringBuffer buffer = new StringBuffer();

int copyFrom = 0;

while(start != -1)

{

buffer.append(origChars, copyFrom, start - copyFrom);

buffer.append(to);

copyFrom = start + lf;

start = orig.indexOf(from, copyFrom);

}

buffer.append(origChars, copyFrom, origChars.length - copyFrom);

return buffer.toString();

}

 

private String logout(HttpServletRequest req, HttpServletResponse resp)

 {

  String logoutURL = "http://" + req.getServerName() + ":" + req.getServerPort() + "/abc";

  if(PasswordProtected)

  {

   logoutURL = logout_URL;

  }

  HttpSession ses = req.getSession();

  if(ses == null)

  {

   return logoutURLforme;

  }

  ses.invalidate();

  return logoutURLforme;

 }