Here you can find the source of getInputStream(String filename)
public static java.io.InputStream getInputStream(String filename)
//package com.java2s; /*//from www.j av a2s. c o m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.FileInputStream; import java.io.IOException; public class Main { public static java.io.InputStream getInputStream(String filename) { File file = null; FileInputStream fin = null; try { file = new File(filename); if (file != null && file.isFile()) { fin = new FileInputStream(file); return fin; } return null; } catch (IOException ex) { fin = null; throw new RuntimeException(ex); } } }