Here you can find the source of loadImage(InputStream s)
public static BufferedImage loadImage(InputStream s) throws IOException
//package com.java2s; /******************************************************************************* * MIT License//ww w .ja v a 2s .c om * * Copyright (c) 2016 Ashur Rafiev * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. *******************************************************************************/ import java.awt.Image; import java.awt.MediaTracker; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.io.DataInputStream; import java.io.IOException; import java.io.InputStream; import javax.swing.JPanel; public class Main { private static final MediaTracker imageAssist = new MediaTracker(new JPanel()); public static BufferedImage loadImage(InputStream s) throws IOException { Image img = Toolkit.getDefaultToolkit().createImage(loadBytes(s)); try { imageAssist.addImage(img, 1); imageAssist.waitForID(1); imageAssist.removeImage(img); } catch (InterruptedException e) { throw new IOException("Interrupted while loading image"); } BufferedImage bufImg = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB); bufImg.getGraphics().drawImage(img, 0, 0, null); return bufImg; } public static byte[] loadBytes(InputStream s) throws IOException { DataInputStream in = new DataInputStream(s); byte bytes[] = new byte[in.available()]; in.readFully(bytes); in.close(); return bytes; } }