check e-mail address

painkiller6.6.6 · 04-04-2003, 01:37 AM

Hi, I'm doing an applet in java where I get users e-mail address. I'm trying to check if the e-mail is right written, something@something.something .Do you know how to do it?, or some webpage that can explain it?.
Thanks in advance.

grub · 04-04-2003, 04:04 AM

Hi painkiller, I think for solutions you have to search on any java site or java documentation.

FredrikN · 04-04-2003, 08:56 AM

Wait some minutes and I can write something for you.......

FredrikN · 04-04-2003, 09:14 AM

test@linuxquestions.org "is valid"

test@linuxquestionsorg "not valid"

test@linuxquestions@org "not valid"

test.linuxquestions@org "not valid"

test@linuxquestions.org. "not valid" (ending with a dot)

and so on......

It's not perfekt 100% but I hope it's better than nothing

Code:

import java.util.*;

public class EmailChecker
{
	
	private int countAt;
	private int countDot;
	private int countRight;
	private int pos;
	private int target;
	private String right;
	private StringTokenizer strTok;
		
	public boolean check(String adress)
	{
		
				
		for(int j = 0 ; j < adress.length() ; j++)
		{
			if(adress.charAt(j)=='@')
				countAt++;
	
			if(adress.charAt(j)=='.')
				countDot++;
				
		}
		
		if((countAt != 1) || (countDot < 1))
		{
			return false;
		}
		
		//Check so there is something before the @ and after
		
		if((adress.charAt(0) == '@') || (adress.charAt((adress.length())-1) == '@') || (adress.charAt((adress.length())-1) == '.'))
		{
			return false;
		}
		
		for(int j = 0 ; j < adress.length() ; j++)
		{
			if(adress.charAt(j)=='@')
				target = pos++;
	
			pos++;	
		}		
		
		if(target < adress.length()+1)
		{
		
			if((adress.charAt(target+1) == '.') || (adress.charAt(target+2) == '.'))
			{
				return false;
			}
		}	
		
		strTok = new StringTokenizer(adress,"@");
		
		while(strTok.hasMoreTokens())
		{
			right = strTok.nextToken();
		}
		
		//Checking for a . after @
		for(int j = 0 ; j < right.length() ; j++)
		{
			if(right.charAt(j)=='.')
				countRight++;
		}		
		
		if(countRight < 1)
		{
			return false;
		}
	
		
		if(right.length() < 3)
		{
			return false;
		}
		
			
		return true;
	}
		
	
}

mukul_joshi · 04-08-2003, 12:32 AM

Check out this Site http://www.network-tools.com it has got a Email Validation there

Shak · 04-11-2003, 06:39 AM

I didnt do this in Java but I did it in PHP, the way that I did it was to make sure that it was valid by splitting it round the @ sign and checking both of the sections for anything invalid, I then ran the checkdns function on the domain to check that it exists.

Shak

FredrikN · 04-11-2003, 06:43 AM

I did something similar in PHP to a few months ago and I was also checking with DNS if the domain existed.

But in an performences point of view it's a bad idé.

It all depends on how fast you want the 'Email checking' to be

Shak · 04-11-2003, 06:51 AM

Thats a fair point, it depends what its for, if its for something really important then its worth taking the time out to do it

Shak

FredrikN · 04-11-2003, 06:53 AM

That's true

painkiller6.6.6 · 06-13-2003, 02:30 AM

Thanks a lot. Sorry for answering so so late, but I had some problems, bike crash, and I wasn´t in the mood of programming, now everything is OK and I'm back.

Looking_Lost · 06-13-2003, 06:19 AM

You can do regular expression checking the same sort of way as perl does on strings if you just want to test the syntax

stringname.match("<expression")

something you could look into I guess if you wanted.