Here you can find the source of getResourceAsFile(String resourcePath)
private static File getResourceAsFile(String resourcePath)
//package com.java2s; /*/*from w w w . jav a2 s .com*/ * Copyright (C) 2018 Nafundi * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public class Main { private static File getResourceAsFile(String resourcePath) { try { InputStream in = ClassLoader.getSystemClassLoader().getResourceAsStream(resourcePath); if (in == null) { return null; } File tempFile = File.createTempFile(String.valueOf(in.hashCode()), ".tmp"); tempFile.deleteOnExit(); try (FileOutputStream out = new FileOutputStream(tempFile)) { //copy stream byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = in.read(buffer)) != -1) { out.write(buffer, 0, bytesRead); } } return tempFile; } catch (IOException e) { e.printStackTrace(); return null; } } }