Thread: Writing to a text file

Originally Posted by Norm

I've added code tags.
Please next time wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

The code needs import statements and a main() method so that it can be compiled and executed for testing.

Hello,

Sorry about the code tags. This was my first post and I didn't know about them.

Yeah, I guess it does need import statements and a main() method.

--- Update ---

With imports and main(). It creates the file but it doesn't write in it. Obviously, I'm doing something wrong but I don't know what :-(

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
 
public class Monitoring {
 
	private static DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH_mm_ss");
	private static LocalDateTime now;
	private static String perfLogFile;
	private static FileWriter writer;
	private static BufferedWriter out;
 
	public static void InitPerformancesReport(String suffix) {
		now = LocalDateTime.now();
		perfLogFile = dtf.format(now) + "_" + suffix + ".log";
		String directoryName = "C:\\TempsDeResponse";
		File directory = new File(directoryName);
		File file = new File(directoryName + "\\" + perfLogFile);
 
		if (!directory.exists()) {
			directory.mkdir();
		}
 
		try {
			if (file.createNewFile()) {
				System.out.println("File is created");
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println("Cannot create file");
			e.printStackTrace();
		}
 
		try {
			writer = new FileWriter(perfLogFile);
			out = new BufferedWriter(writer);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println("Cannot create writer");
			e.printStackTrace();
		}
	}
 
	public static void WriteToPerformancesReport(String transactionName, Long transactionTime) {
		try {
 
			out.write("TEST");
			out.newLine();
			System.out.println("Written to file");
 
		} catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println("Cannot write to file");
			e.printStackTrace();
		}
 
	}
 
	public static void ExportPerformancesReport() {
		try {
			out.close();
			writer.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}		
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		InitPerformancesReport("EPREMIUM");
		WriteToPerformancesReport("Test", (long)2000);
		ExportPerformancesReport();
	}
}

Originally Posted by Norm

Where does the out instance write to?
The program is writing a file, but not where you are looking for it.

Note: Method names should begin with lowercase letters. Class names begin with uppercase.

Hello,

Yeah I see. I'm declaring the variable file to hold path + filename but then I'm not using it when I create the writer. Thank you for your help.

Thanks also for the tip on coding standards, I will review them. Java is definitely not my usual programming language.

Thank you,
Muriel

Thank you. I may have some input. Is this class file part of a package that will perform the function? a copy() method already exist in another file. java.lang.*.