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Message:

Parsing strings

Posted by Hiran on January 16, 2002 at 2:32 PM

Why don't you read in the lines one at a time (use a BufferedReader), parse the line and check for certain criteria. For example, you can check to see if there is a space anywhere in the string, and then store it to display to the user. You can also check for double @ symbols, and anything else that constitutes an invalid email. I've included some code to demonstrate.

public class FindInvalidEmail
{
  private BufferedReader emailFile;
  // Creates a BufferedReader object using the fileName string
  // for the path and file name
  public FindInvalidEmail(String fileName)
  {
     emailFile = new BufferedReader(new FileReader(fileName));
  }
  // Finds the invalid email and returns it
  public String parseString()
  { 
    String lineOfFile = "";
    String invalidEmail = "There are no invalid email addresses";
    while ((lineOfFile = emailFile.readLine()) != "")
    {  
       for (int i=0; i       {  
          if (lineOfFile.charAt(i) == ' ')
          {  
            invalidEmail = "The invalid email address is " + lineOfFile
          }
       }
    }
    return invalidEmail;
  }
  public static void main(String[] args)
  {
    FindInvalidEmail invEm = new FindInvalidEmail("c:\\test.txt");
    System.out.println(invEm.parseString());
  }

> >

> > public class testproggie
> > {
> >     public static void main(String args[])
> >     {
> >         byte invalidemail[]={112,108,101,97,115,101,32,100,111,32,121,111,117,114,32,111,119,110,32,104,111,109,101,119,111,114,107};
> > 	FileInputStream in=new FileInputStream("images\\aa.txt");
> > 	int b=0;
> > 	while (true)
> > 	{
> >             b=in.read();
> > 	    if(b==-1) break;
> > 	}
> >         System.out.println("The invalid address is : " + new String(invalidemail));
> >     }
> > }
> >