How to read file from resources folder

Source https://howtodoinjava.com/core-java/io/read-file-from-resources-folder/

Project Structure

Below image describe the folder structure used in this example.

Read file using ClassLoader.getResource().toURI()

In this example, we will use the ClassLoader reference of instance of class.

package com.howtodoinjava.demo; import java.io.File; import java.io.IOException; import java.nio.file.Files; public class ReadResourceFileDemo {     public static void main(String[] args) throws IOException     {         String fileName = "config/sample.txt";         ClassLoader classLoader = new ReadResourceFileDemo().getClass().getClassLoader();         File file = new File(classLoader.getResource(fileName).getFile());                   //File is found         System.out.println("File Found : " + file.exists());                   //Read File Content         String content = new String(Files.readAllBytes(file.toPath()));         System.out.println(content);     } }

If you do not want to create any un-necessary instance of any class then you may utilize system classloader instance as below:

String fileName = "config/sample.txt"; // ClassLoader classloader = Thread.currentThread().getContextClassLoader(); ClassLoader classLoader = ClassLoader.getSystemClassLoader(); File file = new File(classLoader.getResource(fileName).getFile()); //File is found System.out.println("File Found : " + file.exists()); //Read File Content String content = new String(Files.readAllBytes(file.toPath())); System.out.println(content);

Program output is shown below.

Output:

File Found : true
Test Content

Read file using Spring’s ResourceUtils.getFile()

If your application happens to be spring based application then you may directly take advantage of ResourceUtils class.

File file = ResourceUtils.getFile("classpath:config/sample.txt") //File is found System.out.println("File Found : " + file.exists()); //Read File Content String content = new String(Files.readAllBytes(file.toPath())); System.out.println(content);

Program output is shown below.

Output:

File Found : true
Test Content

Happy Learning !!

References:

Spring ResourceUtils
ClassLoader.getResource()