无法在导出的jar中找到/打开图像 [英] Unable to locate/open image inside exported jar

问题描述

我已经探讨了Stack Overflow中与此问题相关的每一个解决方案，我遇到的解决方案仅在我的IDE（Eclipse Mars）中工作，但是当导出时它们都失败。

我有一个图像文件，我只想从我的导出的jar里面加载。

从项目布局中可以看到，图像是直接在项目文件夹 CooldownTrackerJava 。要参考它，我已经尝试了各种方法。

  //我的类的名称是AddItemDialog 
 
 //方法1 
 String filePath = File.separator +Images+ File.separator +questionMark.png; 
 InputStream inputStream = AddItemDialog.class.getResourceAsStream（filePath）; 
 BufferedImage img = ImageIO.read（inputStream）; 
  

我以几种方式尝试过方法1。我在文件路径的开头尝试了没有 File.separator 。我明白前者是指一个绝对的路径，而后者是相对的。我也尝试将Images文件夹移动到我的类文件所在目录下。

当导出和测试多次时，所有这些都失败了给我一个 NullPointerException 。

  //方法2 
 String saveLocation = File.separator +Images+ File.separator +questionMark.png; 
 Image img = Toolkit.getDefaultToolkit（）。getImage（getClass（）。getResource（saveLocation））; 
  

解决方案

解决方案是一个两部分的努力。首先，我将图像文件夹移动到 src 目录中，如下所示。对马修的赞许。

然后我删除 File.separator ，并用正斜杠 / 替换。感谢fge。

不要使用File.separator（）。类路径上资源路径的分隔符始终为/。如果您使用Windows，您将总是会收到错误的结果。

我使用方法1的变体来测试它。两种方法都可以正常工作。

  String saveLocation =/Images/questionMark.png; 
 InputStream inputStream = this.getClass（）。getResourceAsStream（saveLocation）; 
 try {
 BufferedImage img = ImageIO.read（inputStream）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
  

I have explored every single solution related to this problem on Stack Overflow, and the solutions I encountered worked only in my IDE (Eclipse Mars), but when exported they all failed.

I have an image file I simply want to load from inside my exported jar.

As you can see from the project layout, Images is a folder directly inside of the project folder CooldownTrackerJava. To refer to it, I've tried a variety of methods.

//My class' name is AddItemDialog

//Method 1
String filePath = File.separator + "Images" + File.separator + "questionMark.png";
InputStream inputStream = AddItemDialog.class.getResourceAsStream(filePath);
BufferedImage img = ImageIO.read(inputStream);

I tried method 1 in a few ways. I tried it with and without the File.separator at the start of the filePath. I understand that the former refers to an absolute path, while the latter is relative. I also tried moving the Images folder inside of the directory where my class files were.

All of these failed giving me a NullPointerException when exported and tested multiple times.

//Method 2
String saveLocation = File.separator + "Images" + File.separator + "questionMark.png";    
Image img = Toolkit.getDefaultToolkit().getImage(getClass().getResource(saveLocation));

As per this post I tried the above method however it still did not work.

I've tried many variations aside from the ones mentioned in this post but none of them have been successful when I exported the jar.

Do I need to add the Images folder to my build path? Should I move it to the src folder? Am I missing one obvious step? All suggestions would be highly appreciated. Also here is the layout of the exported jar file.

解决方案

The solution was a two-part effort. Firstly, I moved my Images folder into the src directory as shown below. Kudos to Matthew.

I then removed File.separator and replaced it with a forward slash/. Thanks to fge.

Do not use File.separator(). Separators for resource paths on the class path is always /. If you use Windows you will therefore always get the wrong result.

I used a variant of method 1 to test it. Both methods will work though.

String saveLocation = "/Images/questionMark.png";
InputStream inputStream = this.getClass().getResourceAsStream(saveLocation);
try {
    BufferedImage img = ImageIO.read(inputStream);
} catch (IOException e) {
    e.printStackTrace();
}

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