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POLoading Images from a Jarfile
 

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  1. POLoading Images from a Jarfile
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    <p>Alright so here is my problem and my question to you.....</p> <p>I have a game in which it needs to load images from the jar file (all the images are packed into the jar file like so): I first have the unzip of the jar file: <img src="https://i.stack.imgur.com/7ruhX.png" alt="Unziped Jar File"></p> <p>Then it goes to: <img src="https://i.stack.imgur.com/10o6R.png" alt="cards folder"></p> <p>Then inside each of those folder i have something that looks like this: <img src="https://i.stack.imgur.com/gapLk.jpg" alt="what the other folders look like also"></p> <p>Now reminder above is the Jarfile GameClient.jar unziped and you see where the cards are in it.</p> <p>So here is my code for trying to load each and every one of those images into memory</p> <pre><code> private void addCardsAndChangeSize() throws IOException { String tempString; ImageIcon tempIcon; allCards.clear(); ClassLoader cldr = this.getClass().getClassLoader(); URL imageURL; for(int i = 0; i &lt; all.length; i++) { for(int x = 0; x &lt; clubs.length; x++) { tempString = all[i][x]; tempString = "/cards/"+cardFolders[i]+"/"+tempString; imageURL = cldr.getResource(tempString); tempIcon = resizeImage(new ImageIcon(imageURL),70,70,false); tempString = all[i][x]; tempIcon.setDescription(tempString); allCards.add(tempIcon); } } backCard = resizeImage(new ImageIcon(cldr.getResource(back)),70,70,false); } </code></pre> <p>So i call that in the contructor to load all the images into an ArrayList here is the whole class if you want to know what i do.</p> <pre><code>package global; import java.awt.*; import java.io.IOException; import java.net.URL; import java.util.ArrayList; import java.util.Collections; import java.util.Random; import javax.imageio.ImageIO; import javax.swing.*; public class Cards { private ImageIcon backCard = new ImageIcon("cards/backCard.jpg"); private String back = "/cards/backCard.jpg"; private String[] cardFolders = { "clubs","diamonds","hearts","spades" }; private String[] clubs = { "aceClubs.jpg","eightClubs.jpg","fiveClubs.jpg","fourClubs.jpg","jackClubs.jpg", "kingClubs.jpg","nineClubs.jpg","queenClubs.jpg","sevenClubs.jpg","sixClubs.jpg", "tenClubs.jpg","threeClubs.jpg","twoClubs.jpg" }; private String[] diamonds = { "aceDia.jpg","eightDia.jpg","fiveDia.jpg","fourDia.jpg","jackDia.jpg","kingDia.jpg", "nineDia.jpg","queenDia.jpg","sevenDia.jpg","sixDia.jpg","tenDia.jpg","threeDia.jpg", "twoDia.jpg" }; private String[] hearts = { "aceHearts.jpg","eightHearts.jpg","fiveHearts.jpg","fourHearts.jpg","jackHearts.jpg", "kingHearts.jpg","nineHearts.jpg","queenHearts.jpg","sevenHearts.jpg","sixHearts.jpg", "tenHearts.jpg","threeHearts.jpg","twoHearts.jpg" }; private String[] spades = { "aceSpades.jpg","eightSpades.jpg","fiveSpades.jpg","fourSpades.jpg","jackSpades.jpg", "kingSpades.jpg","nineSpades.jpg","queenSpades.jpg","sevenSpades.jpg","sixSpades.jpg", "tenSpades.jpg","threeSpades.jpg","twoSpades.jpg" }; private String[][] all = { clubs,diamonds,hearts,spades }; private ArrayList&lt;ImageIcon&gt; allCards = new ArrayList&lt;ImageIcon&gt;(); public Cards() { try { addCardsAndChangeSize(); shuffle(); } catch(Exception e) {e.printStackTrace();} } /** * @param x Cards name with extension * @return Face Value of Card */ public static int getFaceValue(String x) { int face = 0; switch(x) { case "aceClubs.jpg": case "aceDia.jpg": case "aceHearts.jpg": case "aceSpades.jpg": face = 1; break; case "eightClubs.jpg": case "eightDia.jpg": case "eightHearts.jpg": case "eightSpades.jpg": face = 8; break; case "fiveClubs.jpg": case "fiveDia.jpg": case "fiveHearts.jpg": case "fiveSpades.jpg": face = 5; break; case "fourClubs.jpg": case "fourDia.jpg": case "fourHearts.jpg": case "fourSpades.jpg": face = 4; break; case "jackClubs.jpg": case "jackDia.jpg": case "jackHearts.jpg": case "jackSpades.jpg": case "kingClubs.jpg": case "kingDia.jpg": case "kingHearts.jpg": case "kingSpades.jpg": case "queenClubs.jpg": case "queenDia.jpg": case "queenHearts.jpg": case "queenSpades.jpg": case "tenClubs.jpg": case "tenDia.jpg": case "tenHearts.jpg": case "tenSpades.jpg": face = 10; break; case "twoClubs.jpg": case "twoDia.jpg": case "twoHearts.jpg": case "twoSpades.jpg": face = 2; break; case "threeClubs.jpg": case "threeDia.jpg": case "threeHearts.jpg": case "threeSpades.jpg": face = 3; break; case "sixClubs.jpg": case "sixDia.jpg": case "sixHearts.jpg": case "sixSpades.jpg": face = 6; break; case "sevenClubs.jpg": case "sevenDia.jpg": case "sevenHearts.jpg": case "sevenSpades.jpg": face = 7; break; case "nineClubs.jpg": case "nineDia.jpg": case "nineHearts.jpg": case "nineSpades.jpg": face = 9; break; } return face; } //shuffles all the cards in the deck private void shuffle() { long seed = System.nanoTime(); Collections.shuffle(allCards, new Random(seed)); } /** * Chooses a card at random from the deck. Also removes that card when chosen * @return randomly chosen card */ public ImageIcon getRandomCard() { int index = ((int)Math.random() * allCards.size()); return allCards.remove(index); } /** * @return Image of the back of a card */ public ImageIcon getBackCard() {return backCard;} public static ImageIcon parseImage(String x) { if(x.contains("Dia")) return new ImageIcon("cards/diamonds/"+x); else if(x.contains("Clubs")) return new ImageIcon("cards/clubs/"+x); else if(x.contains("Hearts")) return new ImageIcon("cards/hearts/"+x); else if(x.contains("Spades")) return new ImageIcon("cards/spades/"+x); return null; } //adds all the cards and adds a description to them loaded into memory private void addCardsAndChangeSize() throws IOException { String tempString; ImageIcon tempIcon; allCards.clear(); ClassLoader cldr = this.getClass().getClassLoader(); URL imageURL; for(int i = 0; i &lt; all.length; i++) { for(int x = 0; x &lt; clubs.length; x++) { tempString = all[i][x]; tempString = "/cards/"+cardFolders[i]+"/"+tempString; imageURL = cldr.getResource(tempString); tempIcon = resizeImage(new ImageIcon(imageURL),70,70,false); tempString = all[i][x]; tempIcon.setDescription(tempString); allCards.add(tempIcon); } } backCard = resizeImage(new ImageIcon(cldr.getResource(back)),70,70,false); } //resizes images public ImageIcon resizeImage(ImageIcon imageIcon, int width, int height, boolean max) { Image image = imageIcon.getImage(); Image newimg = image.getScaledInstance(-1, height, java.awt.Image.SCALE_SMOOTH); int width1 = newimg.getWidth(null); if ((max &amp;&amp; width1 &gt; width) || (!max &amp;&amp; width1 &lt; width)) newimg = image.getScaledInstance(width, -1, java.awt.Image.SCALE_SMOOTH); return new ImageIcon(newimg); } </code></pre> <p>}</p> <p>I keep getting null pointer exception on the <code>tempIcon = resizeImage(new ImageIcon(imageURL),70,70,false);</code></p> <p>Can anyone tell me why this isn't loading the images properly? Reminder i am pre-loading them into memory. My question is not how to make this better i am just simply asking what am i doing wrong with the class loader and stuff like that......</p> <p>I am somewhat new at java and i know some of this code will look horrible to you but please again i am not asking how to make this code "pro" im just looking for the explanation why its giving me null.</p> <p>Thanks!</p> <p>P.S. If you need more pictures of info or w.e. i will try to put that up right away</p>
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    1. COJava is case sensitive when reading resources from Jar files. Are you sure that the file extension is '.jpg' and not '.JPG' ?
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    2. COIt is .jpg not .JPG but thanks for that for further use
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    3. COWhich card exactly is causing the problem? Is it the first card you try to load? There might be a typo somewhere in your big list of card filenames. You should check `imageURL` for null and if so throw an exception that gives you the filename that caused the problem. That might reveal the cause.
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