Using Scanner and FileReader to read from a file in real time
Hi
I would like to read continually from a text file (which is continually being appended to) and display each line as it appears in the textfile (in a text area).
What I would like to know is do I have to continually reopen the file (using FileReader) and buffer it into a Scanner everytime I want to read the changes made to it? There must be a better way.
Much appreciation for any help.
[416 byte] By [
msparka] at [2007-11-27 11:47:43]
I think you have to reopen your file every time you want to update your textarea.
Why you don't use a database? You can then read the last row which has been recently updated.
I tried to reopen the file in a while loop, after scanner has read the last line. But if I it seems that if I amend the file and resave it using a seperate application, the new line isn't read. Here's the relevant code:
while(showScreen == true){
try {
fs = new Scanner(new BufferedReader(new FileReader(outFile)));
fs.useDelimiter("\\r");
} catch(IOException e){
System.out.println("Problems opening file. IO exception: " + e.toString());
return;
}
if (fs!=null){
//Call method to read and display each line in textArea
readAndDisplay();
fs.close();
fs = null;
}
//Wait half a second before checking if there is anymore text
try {
wait(500);
} catch (InterruptedException e){
System.out.println("File reading interrupted");
return;
}
}// while
Any ideas as to why this doesn't work?
