Here you can find the source of getResourceAsStream(Class> clazz, String fileName)
public static InputStream getResourceAsStream(Class<?> clazz, String fileName)
//package com.java2s; /*//from w w w. ja v a 2 s . com * Copyright 2010 Granule Inc. * * 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.InputStream; public class Main { public static InputStream getResourceAsStream(Class<?> clazz, String fileName) { InputStream is = clazz.getResourceAsStream(fileName); if (is == null) { is = clazz.getClassLoader().getResourceAsStream(fileName); } if (is == null) { is = ClassLoader.getSystemResourceAsStream(fileName); } if (is == null) { is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName); } return is; } }