一旦出口，JAVA找不到/绘制图像 [英] Once exported, java cannot find/draw images

问题描述

您好stackoverflowites，

Hello stackoverflowites,

我在开发2D游戏的过程中，当我运行Eclipse中，我的程序加载它的所有图像和资源的罚款。不过，我使用创建我的图片和图像图标的未必然，推荐的方式，这是如下图所示：

I am in the process of developing a 2d game, and when I run it inside of eclipse, my program loads all of it's images and resources fine. However, I am using the not-necessarily-recommended way of creating my images and image icons, which is shown below:

bannerLogo.setIcon(new ImageIcon("/res/client/BannerHeader.jpg"));

现在，导出到一个罐子时，它不显示图像（其中因为即时通讯没有使用正确的方法的预期。）

Now, when exporting to a jar, it does not show the image (which is expected since im not using the correct way.)

我搜索了正确的方式做到这一点，这是我发现的是：

I searched for the correct way to do it, which I found was:

URL imgURL = getClass().getResource("/res/client/BannerHeader.jpg");
Image bannerImg = Toolkit.getDefaultToolkit().getImage(imgURL);
bannerLogo.setIcon(new ImageIcon(bannerImg));

这没有任何工作，我得到一个未捕获错误获取图像：跟踪，刚刚告诉我，我的网址（imgUrl的）为空。 （这是当我的Eclipse内运行，你要知道，我甚至没有带出口它尚未）

And that didn't work either, I get an "Uncaught error fetching image: " trace, which just tells me that my URL (imgURL) is null. (This is when I run inside of eclipse, mind you, I havn't even exported it yet)

我想它是与我的类路径，但我想不出什么。

I figure it has something to do with my classpath,however I cannot figure out what.

在Eclipse中，我的包结构如下：

Inside of eclipse, my package structure is as follows:

（父目录，项目名称）

+ src文件夹，有正常的包等，构建路径

+src folder, has normal packages, etc, on build path

+资源文件夹，（RES），而不是构建路径（试过构建路径上，没有什么变化）

+resource folder, ("res"), not on build path (tried it on build path, nothing changed)

+++资源文件夹的子目录

+++subdirectories of resource folder

林在这里做什么人的损失。对不起，文字的墙。

Im at a loss of what to do here guys. Sorry for the wall of text.

推荐答案

您code最初寻找图像文件和文件不JAR文件，只是资源的内部存在。所以，你是正确的使用 getClass.getResource（/ RES /客户/ BannerHeader.jpg）尝试; 。但要确保图像实际上是在一个目录类文件目录的jar文件，并使用相对于类路径目录的路径。

Your code was initially looking for image files, and files do not exist inside of a Jar file, just resources. So you were correct to try using getClass.getResource("/res/client/BannerHeader.jpg");. But make sure that the image is in fact in the jar file in a directory off of the class file directory, and use a path that is relative to the class path directory.

该错误不告诉你，这是错误的，或者该文件是空的，而是你需要把这个在try / catch块。我建议你​​阅读例外教程了解这一点。

The error isn't telling you that this is wrong or that the file is null, but rather you need to place this in a try/catch block. I suggest that you read the Exceptions Tutorial for more on this.

修改1 结果
当你说你有一个未捕获的异常错误，在我看来，你有一个编译错误，而不是一个运行时异常。很抱歉的混乱。

Edit 1
When you stated you had an uncaught exception error, it seemed to me that you had a compilation error, not a run-time exception. Sorry for the confusion.

至于在何处放置的图像，它一定程度上取决于你所使用的IDE。我使用Eclipse，我加了，我称之为图像，并把我的图片有我的Java文件包目录的目录。然后我用资源来寻找图像/ myImage.jpg这个参数。

As for where to place the images, it somewhat depends on what IDE you're using. I use Eclipse, and I add a directory off of my java file package directory that I call images and place my images there. I then use resources to look for "images/MyImage.jpg".

举例来说，假设我在Eclipse包看起来像这样：

For example, say my packages in Eclipse look like so:

因此​​，类文件位于MyPackage的包中，并把影像文件，GridBoxClassPic.JPG位于图像关闭目录类文件的目录，这样我就可以使用String 字符串找到它RESOURCE_PATH =图像/ GridBoxClassPic.JPG;

So the class files are located in the myPackage package, and the image file, GridBoxClassPic.JPG is located in the images directory off of the class file directory, so I can find it using the String String RESOURCE_PATH = "images/GridBoxClassPic.JPG";.

这code可以显示图片：

This code could show the image:

import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;

public class MyClass {
   private static final String RESOURCE_PATH = "images/GridBoxClassPic.JPG";

   public MyClass() {
      try {
         BufferedImage image = ImageIO.read(getClass().getResource(RESOURCE_PATH));
         ImageIcon icon = new ImageIcon(image);
         JLabel label = new JLabel(icon);
         JOptionPane.showMessageDialog(null, label);
      } catch (IOException e) {
         e.printStackTrace();
      }
   }

   public static void main(String[] args) {
      new MyClass();
   }
}

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