How to read nextChar from a file or how to read ip:port from a txt file

[sirin_adam]

Hello!

I need to read from a txt file ip:port (or in some lines ip:portDdateCinteger). But i can not do it because there is no nextChar method on Scanner class.

The txt file is like this:

332.234.32.11.11.222:8080
123.32.45.43.32.11:8976D12.01.2010C5
44.44.111.114.44.43:220
222.333.44.55.66.77:8089
111.11.11.11.22.33:8080D01.01.2009C1

...

There are million line on txt file. I need to read one by one from my Java program by reading ip, port, if exist date and check number.

This program must work multi-platform. Thats why i get the end of line string with System.getProperty("line.separator") method.

Can someone help me please?

Thank you!

[harinath_2007]

you can use StringTokenizer class inorder to differentiate ip and port

[NormR1]

Have you tried the Scanner class's useDelimiter() method?
Try this:

Scanner input = new Scanner("332.234.32.11.11.222:8080");
            input.useDelimiter("\\.");
            while(input.hasNext()) {
              System.out.println("next="  + input.next());
            }

[sirin_adam]

StringTokenizer and useDelimiter can not solve my problem :( because i am not sure if the line ends with end_of_line character or 'D' character. StringTokenizer and useDelimiter can split the string if we know which character splits the string. I told you some line has date and check number hut some of them does not.

[NormR1]

i am not sure if the line ends with end_of_line character or 'D' character

If you don't know the delimiters for a line, that makes it very hard to read a "line".
By 'D' do you mean the character 'D' or 0xd ?
What is the format of the data on a line? How will you know when you are at the end of a line?

[sirin_adam]

With that:
read.useDelimiter(" : | " + end_of_line+ "|D|C");
i can not understand if the line ends or not :(

If you don't know the delimiters for a line, that makes it very hard to read a "line".
By 'D' do you mean the character 'D' or 0xd ?
What is the format of the data on a line? How will you know when you are at the end of a line?

I mean the character 'D' .

The format of line is very simple

ip:port OR ip:portDdateCnumber
example for each
332.234.32.11.11.222:8080 OR 123.32.45.43.32.11:8976D12.01.2010C5

It will be very simple if java scanner had a nextChar() method :( .

End of line character is System.getProperty("line.separator")

[NormR1]

End of line character is System.getProperty("line.separator")

On my system that character has a value of 0x0d0a.
What is the value on your system?

String lineSep =  System.getProperty("line.separator");
      System.out.print("l.s="); 
      for(int i=0; i < lineSep.length(); i++)
          System.out.print(Integer.toHexString(lineSep.charAt(i)) + " ");  // l.s=d a

What does the Scanner class do when reading a file with lines separated by 0x0d0a characters? Have you tried that?

[sirin_adam]

On my system that character has a value of 0x0d0a.
What is the value on your system?

String lineSep =  System.getProperty("line.separator");
      System.out.print("l.s="); 
      for(int i=0; i < lineSep.length(); i++)
          System.out.print(Integer.toHexString(lineSep.charAt(i)) + " ");  // l.s=d a

What does the Scanner class do when reading a file with lines separated by 0x0d0a characters? Have you tried that?

My line sperator is "d a" at the moment(i am on windows now). (My program must work multiplatform (linux-unix-win) ).

Why you asked my end seperator ?

[NormR1]

Why you asked my end seperator ?

Your program needs to read each line. To do that it needs to know what defines the end of a line.
When a line has been read, then you need to parse the line to get the values from the line.
Are you able to read the file, line by line?
Write a small simple test program to read the first 10 lines from the file and print them out to be sure you can read a line.

[sirin_adam]

I solve the problme. I don't need to understand if i am on end of line. Because i read first all the line and i put it on a string. After that i read the Scanner.next with useDelimiter(" : |D|C"). If it gives error (which i catch it with try-catch) when i read with Scanner.next that means this line includes just ip and port. if it will not give me an error that means it has also date and check numnber. I try it it works :)

Thanks for your helping me... :)