读取不在可运行jar中的主包中的文本文件 [英] Read text file that is not in the main package in a runnable jar

问题描述

我有一个Swing Java程序，在包含不同类型的JSON的子文件夹的名为'res'的资源文件夹中读取* .txt文件。当我直接从Eclipse运行，一切都很好。如果我创建一个可执行的jar它不工作。我设法使它的工作与一个可怕的解决方案，把我所有的文本文件包在他们被叫。

要阅读他们，我使用这一行代码： / p>

  InputStream is = this.getClass（）。getResourceAsStream（file +.txt）; 
  

其中file是一个字符串。我以为这将在jar中搜索指定的文件，但显然不是。我试图将路径放在文件res / subfolder / name_of_file.txt和子文件夹/ name_of_file.txt上，但无效。
这是我的项目的结构

 项目
 src 
 com.package 
 res 
 JSON_type1 
 JSON_type2 
 file.txt 
  

从com.package，我有一个类必须从JSON_type2 / file.txt读取。除了将文本文件保存在子文件夹中的明显原因是，我的GUI将使用这些子文件夹的内容填充一个下拉列表。

从我的从其他问题汇总，getResourceAsStream（）本来是我的解决方案，如果我想把我的文本文件保存在包中被调用的位置。除此之外，我发现了一些关于子类化的一些 ClassLoader 并覆盖 findResource（）。如果可能，我想避免这种解决方案，因为我远不熟悉该类及其功能。

如果您需要更多信息，请告诉我们。

谢谢

PS：这个问题源于我之前的问题

  //添加前导/表示从class-path的根目录搜索
 String file =/res/JSON_type2/file.txt; 
 InputStream is = this.getClass（）。getResourceAsStream（file）; 
  

I have a Swing Java program that reads *.txt files in a resource folder called 'res' containing subfolders of different kind of JSONs. When I run directly from Eclipse, all is fine. If I create an executable jar it doesn't work. I managed to make it work with an horrifying solution, putting all my text files in the package where they are called.

To read them I use this line of code:

InputStream is = this.getClass().getResourceAsStream(file + ".txt");

where file is a string. I thought this would search in the jar the specified file but obviously not. I tried to put the path to the files, res/subfolder/name_of_file.txt and subfolder/name_of_file.txt but to no avail. Here is the structure of my project

Project
   src
      com.package
   res
      JSON_type1
      JSON_type2
         file.txt

From com.package, I have a class that must read from JSON_type2/file.txt. Besides the obvious reason to keep my text file organized in the subfolders is that my GUI will populates a drop down list with the content of those subfolders.

From what I've gather from other questions here, getResourceAsStream() would have been my solution if I wanted to keep my text files in the package where they are called. Other than that I found something about subclassing ClassLoader and overwriting findResource(). If possible I want to avoid this solution as I'm far from being familiar with that class and its functionalities.

Should you need more informations, let me know.

Thank you

P.S.: This question arose from my previous question here

解决方案

// added leading / to indicate search from root of class-path
String file = "/res/JSON_type2/file.txt";
InputStream is = this.getClass().getResourceAsStream(file);

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