How to write data to txt file in java?

Question

My class:

public class Test{
public static void writeSmth() {
        try {
            BufferedWriter out = new BufferedWriter(
                    new FileWriter("one.txt"));
            out.write("content");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Location of txt file:

/ProjectName/one.txt

when i try to write data nothing happens with this file. I tried:

BufferedWriter out = new BufferedWriter(
                        new FileWriter("/ProjectName/one.txt"));

Got java.io.FileNotFoundException tried:

BufferedWriter out = new BufferedWriter(
                        new FileWriter("./one.txt"));

Still nothing happens.

What is the problem?

did you try the whole absolute path starting form C:/folder1/folder2? — yogidilip, Oct 21 '15 at 20:15
stupid question but are you actually invoking `writeSmth()`? It's static for whatever reason but on a related note there is no main. — secolive, Oct 21 '15 at 20:18
You shouldn't be getting a FileNotFoundException when writing to a file, unless the path doesn't exist or your don't have write permissions for the file — MadProgrammer, Oct 21 '15 at 20:19
Possible duplicate of [java.io.FileNotFoundException: the system cannot find the file specified](http://stackoverflow.com/questions/19871955/java-io-filenotfoundexception-the-system-cannot-find-the-file-specified) — Kick Buttowski, Oct 21 '15 at 20:20

score 2 · Accepted Answer · answered Oct 21 '15 at 20:17

2

You can use System.getProperty(String) to get the user's home directory. For text output I'd prefer a PrintStream. Next, you can write to your output file relative to that path. I'd also use a try-with-resources Statement. Somethin like,

File file = new File(System.getProperty("user.home"), "one.txt");
try (PrintStream ps = new PrintStream(file)) {
    ps.println("content");
} catch (FileNotFoundException e) {
    e.printStackTrace();
}

answered Oct 21 '15 at 20:17

Elliott Frisch

198,278
20
158
249

1

It might not be that the system cannot find the file, but rather that the file is being created in a directory other than where the OP thinks it is. – FredK Oct 21 '15 at 20:23
@FredK I do not think this solution is full proof. what do you think? – Kick Buttowski Oct 21 '15 at 20:24
@KickButtowski Note that OP never calls `close` on `out` (which is *buffered*). – Elliott Frisch Oct 21 '15 at 20:25
@Elliott Frisch what is "user.home"? – Ruslan Lomov Oct 21 '15 at 20:29
@RuslanLomov The user's home directory or folder. It works across operating systems. – Elliott Frisch Oct 21 '15 at 20:30
@Elliott is it default?or how to find that pass? – Ruslan Lomov Oct 21 '15 at 20:35
@RuslanLomov It varies from user to user, and OS to OS. Try `System.out.println(System.getProperty("user.home"));` – Elliott Frisch Oct 21 '15 at 20:37
@Elliott it worked when I wrote project name instead – Ruslan Lomov Oct 21 '15 at 20:37
like this: File file = new File(System.getProperty("ProjectName"), "one.txt"); – Ruslan Lomov Oct 21 '15 at 20:39
@RuslanLomov that's equivalent to `new File("one.txt")` since that property is null. see https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html for a list – zapl Oct 21 '15 at 20:56
@Elliot yes, the stream is buffered, but it will flush when the program terminates, even if the file is not closed. – FredK Oct 21 '15 at 21:21

How to write data to txt file in java?

1 Answers1