FileNotFoundException in src/main/resources

Question

i placed a file in my maven project under src/main/resources the files name is simply temp.txt.

When i try to open the file:

BufferedReader br = new BufferedReader(new FileReader(new File("./temp.txt")));

I get an error:

Exception in thread "main" java.io.FileNotFoundException: \temp.txt

all files under src/main/resources are placed in the root folder of the classpath under maven. So why cant the program find the file here?

Answer 1

If you're going to package the file in the class path, then read it as such.. from the class path.

Maven Structure

src
   main
       resources
               file.txt

After it builds, the file gets placed in the root of the class path. So use

InputStream is = getClass().getResourceAsStream("/file.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(is));

The / in front of file.txt will bring you to the root, from whatever package the class is in.

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UPDATE

Test example

package com.underdogdevs.stackoverflow;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class TestResourceFile {

    public static void main(String[] args) throws IOException {
        InputStream is = TestResourceFile.class.getResourceAsStream("/test.txt");
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        String line;
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
    }
}