Writing to a file

[Rahul Sudip Bose]

I am trying to make a java program to make a simple XML files for my Deployment descriptors in Tomcat, in windows 7.
The problems are :
1.The web.txt file is blank
2.The web.txt file is not renamed to web.xml

I have a doubt, can i make a .xml file and write text to it OR, do i have to make a .txt file - write the text - and then rename it to .xml ?

The code :

import java.io.*;
import java.util.*;

public class XML
{
	
	public static void main(String ...args)
	{
		String app = "<web-app>";
		String app_e = "</web-app>";
		
		File web_xml = new File("web.txt"); 
		PrintWriter pw = null; 
		
		try
		{
			web_xml.createNewFile();// throws io-exception
			pw = new PrintWriter(web_xml);
			
		}catch(IOException ex){System.out.println("SORRY : Problem in creating web.xml file !");}
		
			Scanner sc = new Scanner(System.in);
			System.out.println("\nWelcome to the xml-maker...");

		System.out.println("Enter the name of WEB-APP !!!");
		String WEB_APP = sc.nextLine(); 
		
		pw.println(app);
		pw.println("your xml file is");
		pw.println(app_e);
	
	
	//changing the extention of web.txt to web.xml
	File xml = new File("web.xml");
	web_xml.renameTo(xml); 
	
	}//main

}

[Vishwanath Krishnamurthi]

Rahul Sudip Bose wrote:
1.The web.txt file is blank

Try flushing the printWriter:

pw.flush();

Rahul Sudip Bose wrote:
I have a doubt, can i make a .xml file and write text to it OR, do i have to make a .txt file - write the text - and then rename it to .xml ?

Yes, You can create an xml file and write to it.

And one more thing, don't forget to close the PrintWriter

[Rob Spoor]

Vishwanath is right. You don't flush() or close() the stream, so it may still cache the data. flush() ensures this cached data is written to the file; close() automatically flushes as well.

As for the renaming not working, that's because you didn't close() the stream. As a result, the JVM still has a lock on the file, and that causes the renaming to fail.

[Rahul Sudip Bose]

Thanks to all for making it work.

Theory for other readers with same doubt : flush and close