Java – Read a file from resources folder

https://www.mkyong.com/java/java-read-a-file-from-resources-folder/

 this tutorial, we will show you how to read a file from a resources folder, in both Java and Unit Test environment. In simple, put files in a resources folder, and read the file with following code snippets :

ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("file/test.xml").getFile());

1. Project Directory

Review a Maven project Structure.

2. Classic Example

Example to read a file “test.txt” from a resources folder.

main/resources/file/test.txt

This is line 1
This is line 2
This is line 3
This is line 4
This is line 5

Hello.java

package com.mkyong;

import java.io.File;
import java.io.IOException;
import java.util.Scanner;

public class Hello {

  public static void main(String[] args) {
 Hello obj = new Hello();
 System.out.println(obj.getFile("file/test.txt"));
  }

  private String getFile(String fileName) {

 StringBuilder result = new StringBuilder("");

 //Get file from resources folder
 ClassLoader classLoader = getClass().getClassLoader();
 File file = new File(classLoader.getResource(fileName).getFile());

 try (Scanner scanner = new Scanner(file)) {

  while (scanner.hasNextLine()) {
   String line = scanner.nextLine();
   result.append(line).append("\n");
  }

  scanner.close();

 } catch (IOException e) {
  e.printStackTrace();
 }

 return result.toString();

  }

}

Output

This is line 1
This is line 2
This is line 3
This is line 4
This is line 5