reading .txt file

[mmcnitt]

I'm making a login applet and i can get it to output the information necessary to a file, and i can get it to input all the information from the file for me. However i can't seem to find out how to make it search the file for the information.

I don't wish to show my code, but here's basically the output input method i'm using

import java.io.*;

public class OutputInput
{
	// Main method
	public static void main (String args[])
	{
		try
		{
		    // Open an output stream
		    FileOutputStream fout = new FileOutputStream ("myfile.txt");
			String myName = ("Hello World!!!\nLine 2\nLine 3");
		    // Print a line of text
		    new PrintStream(fout).println (myName);
			
		    // Close our output stream
		    fout.close();		
			
			
			// Open the file that is the first 
			// command line parameter
			FileInputStream fstream = new FileInputStream("myfile.txt");
			// Get the object of DataInputStream
			DataInputStream in = new DataInputStream(fstream);
			BufferedReader br = new BufferedReader(new InputStreamReader(in));
			String strLine;
			//Read File Line By Line
			while ((strLine = br.readLine()) != null)   
			{
				// Print the content on the console
				System.out.println (strLine);
			}
			//Close the input stream
			in.close();
		}
		//Catch exception if any
		catch (Exception e)
		{
			System.err.println("Error: " + e.getMessage());
		}
	}
}

so if i wanted it to just look and see if the file said "Line 3"?

[mmcnitt]

well i ended up making a work around where it just makes a seperate file for each login, but if anyone has any ideas for how i can so it in one file that'd be great

[ckeyrouz]

inside this loop add the following search commands:

while ((strLine = br.readLine()) != null)   
			{
				// Print the content on the console
				System.out.println (strLine);
                                //search for a certain string
                               if(strLine.indexOf("yourString") != -1)
                               {
                                        System.out.println("String found");
                                }
                               else
                               {
                                         System.out.println("String not found");
                                }
			}

[mmcnitt]

thanks ckeyrouz but the only problem i have with that is that so long as you don't misspell it, it finds the string.

ex.

password is hello

h -String found
he -String found
leave it blank -String found
t -String not found

[cs_student]

I think that the Pattern class would help you better search for the items you want. This way you can determine what is and isn't acceptable as a match.

[mmcnitt]

i ended up using a Scanner, actually works quite well, thanks for y'alls help ckeyrouz and cs student