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Sahil Srivastav
validating username and password from database
2 Answer(s)      3 years and 2 months ago
Posted in : JSP-Servlet


Hello sir, i am developing a login page. i want that when i fill data in text fields. it validate data from database. if enter data is match from database. page goes to next page which is servlet. otherwise display an error message.


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June 7, 2011 at 6:12 PM


Hi Sahil

The problem you shared with us is already have solution. Go through the code below :

http://www.roseindia.net/tutorial/jquery/jquerycheckusername.html

The code below used jQuery post method which check the username availability without changing the page.



August 27, 2012 at 12:28 PM


import java.util.regex.Matcher; import java.util.regex.Pattern;

public class UsernameValidator{

  private Pattern pattern;
  private Matcher matcher;

  private static final String USERNAME_PATTERN = "^[a-z0-9_-]{3,15}$";

  public UsernameValidator(){
      pattern = Pattern.compile(USERNAME_PATTERN);
  }

  public boolean validate(final String username){

      matcher = pattern.matcher(username);
      return matcher.matches();

  }

}



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