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Mar 25th, 2009

Re: Delete last line from text file

While you do not need to use the DOM API to handle the XML, it is recommened. Just going through and deleting the last line and appending what you think is right can result in poorly formed XML documents.

If you are having troubles understanding the DOM API please feel free to post your code and ask questions, there are plenty of us here to help.

The basic idea of working with DOM is to:

Get your Document
Load your XML into it
Manipulate/create the tree
Save the document

Adding / removing nodes is very easy and you can build a tree as deep as you need.

Killer_Typo

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Solved Threads: 39

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778 posts
since Apr 2004

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Dec 16th, 2009

Solution to your problem

You don't need to use DOM API for something as simple as this. Here is the code that you can use directly. I've implemented using RandomAccessfile.

Java Syntax (Toggle Plain Text)
import java.io.*;
public class PlayerAdder
{
	public static void main(String args[]) {
		String playerName = "John" ;
		String pointCount = "10";
		String minutes	= "30";
		try{
			RandomAccessFile rand = new RandomAccessFile("playerData.xml","rw");
			long OldLength = rand.length();
			long NewLength = OldLength - 20;
			rand.setLength(NewLength);
			rand.seek(rand.length());
			///adding tags and their data
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("<player>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("\t");
			rand.writeBytes("<playerName>");
			rand.writeBytes(playerName);
			rand.writeBytes("</playerName>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("\t");
			rand.writeBytes("<pointCount>");
			rand.writeBytes(pointCount);
			rand.writeBytes("</pointCount>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("\t");
			rand.writeBytes("<minutes>");
			rand.writeBytes(minutes);
			rand.writeBytes("</minutes>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("</player>");
			rand.writeBytes("\n");
			rand.writeBytes("</indianaTuxPlayer>");
			rand.close();
		}
		catch(Exception e)
		{
			System.out.println("Exception occured :"+e);
		}
	}
}
import java.io.*;
public class PlayerAdder
{
	public static void main(String args[]) {
		String playerName = "John" ;
		String pointCount = "10";
		String minutes	= "30";
		try{
			RandomAccessFile rand = new RandomAccessFile("playerData.xml","rw");
			long OldLength = rand.length();
			long NewLength = OldLength - 20;
			rand.setLength(NewLength);
			rand.seek(rand.length());
			///adding tags and their data
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("<player>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("\t");
			rand.writeBytes("<playerName>");
			rand.writeBytes(playerName);
			rand.writeBytes("</playerName>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("\t");
			rand.writeBytes("<pointCount>");
			rand.writeBytes(pointCount);
			rand.writeBytes("</pointCount>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("\t");
			rand.writeBytes("<minutes>");
			rand.writeBytes(minutes);
			rand.writeBytes("</minutes>");
			rand.writeBytes("\n");
			rand.writeBytes("\t");
			rand.writeBytes("</player>");
			rand.writeBytes("\n");
			rand.writeBytes("</indianaTuxPlayer>");
			rand.close();
		}
		catch(Exception e)
		{
			System.out.println("Exception occured :"+e);
		}
	}
}

camocspro

Reputation Points: 10

Solved Threads: 2

Newbie Poster

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4 posts
since Dec 2009

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Dec 16th, 2009

Re: Delete last line from text file

:sigh: double :sigh:

masijade

Moderator

Reputation Points: 1471

Solved Threads: 490

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since Feb 2006

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