用Eclipse导出后，我的可运行JAR无法打开，可能是由于资源不足

Question

I've searched through dozens of threads all over the Internet (including stackoverflow) and I haven't found anything that helped me, maybe because I'm too dumb to understand it. I'm kind of new to Java so that might be it.

Anyway, the program runs perfectly inside Eclipse, it gets all the needed images, files, etc. Once I export it as a runnable JAR, I can't open it, not even with the command prompt (says "Unable to access).

This is what I tried, importing the resources:

package main;

import java.io.File;

public class Loader {

    public static String path = "/Z:/Eclipse/workspace/FirstGame/src/";

    static File smoothFont;
    static File roughFont;
    static File alahuSong;
    static File deathAlahu;
    static File hitSoundAlahu;
    static File hitSoundBit;
    static File deathBit;
    static File hpBit;
    static File selectbit;
    static File songBit;
    static File colorFile;
    static File easyScoreFile;
    static File normalScoreFile;
    static File hardScoreFile;
    static File insaneScoreFile;
    static File meSteam;
    static File manelFaxe;
    static File mePassado;
    static File manelSteam;

    public static void load(Game game) {
        game.getClass().getResource(path + "res/summerStormSmooth.ttf");
        game.getClass().getResource(path + "res/summerStormRough.ttf");
        game.getClass().getResource(path + "res/alahuSong.ogg");
        game.getClass().getResource(path + "res/deathAlahu.ogg");
        game.getClass().getResource(path + "res/hitSoundAlahu.ogg");
        game.getClass().getResource(path + "res/hitSoundBit.ogg");
        game.getClass().getResource(path + "res/deathBit.ogg");
        game.getClass().getResource(path + "res/hpBit.ogg");
        game.getClass().getResource(path + "res/selectBit.ogg");
        game.getClass().getResource(path + "res/songBit.ogg");
        game.getClass().getResource(path + "res/colorFile.txt");
        game.getClass().getResource(path + "res/easyScoreFile.txt");
        game.getClass().getResource(path + "res/normalScoreFile.txt");
        game.getClass().getResource(path + "res/hardScoreFile.txt");
        game.getClass().getResource(path + "res/insaneScoreFile.txt");
        game.getClass().getResource(path + "res/meSteam.png");
        game.getClass().getResource(path + "res/manelFaxe.png");
        game.getClass().getResource(path + "res/mePassado.png");
        game.getClass().getResource(path + "res/manelSteam.png");
    }
}

Also, this is how my build is organized: :D

I can give you any more information you need, thanks for your help!

Answer 1

You are passing an invalid String value. The String argument accepted by Class.getResource is not a file name.

You should be passing a path relative to the root of your .jar. If you're not sure exactly which files are in your .jar file, either examine the .jar file in Eclipse, or use a Command Window to view the .jar file with jar tf MyApplication.jar .

If your project is set up correctly, it probably bundles the contents of the res directory into your final .jar file, in which case the correct way to invoke Class.getResource is:

static URL smoothFont;
static URL roughFont;
// ...
static URL colorFile;
// ...
static URL meSteam;

public static void load(Game game) {
    smoothFont = Loader.class.getResource("/summerStormSmooth.ttf");
    roughFont = Loader.class.getResource("/summerStormRough.ttf");
    // ...
    colorFile = Loader.class.getResource("/colorFile.txt");
    // ...
    meSteam = Loader.class.getResource("/meSteam.png");
    // ...
}

You cannot refer to your data as File s when they are inside a .jar file, because they're just entries in the .jar file—byte sequences representing compressed data—and not actual separate files.

Fortunately, loading a URL is just as easy as loading a File:

Font loadedSmoothFont;
try (InputStream stream = smoothFont.openStream()) {
    loadedSmoothFont = Font.createFont(Font.TRUETYPE_FONT, stream);
}

String colorFileContents;
try (Scanner scanner = new Scanner(colorFile.openStream())) {
    colorFileContents = scanner.useDelimiter("\\z").next();
}

BufferedImage meSteamImage = ImageIO.read(meSteam);