打开打包在JAR中的PDF文件

问题描述：

我正在尝试打开在运行时打包到jar文件中的PDF文件。基本思想是用户单击帮助选项，然后显示PDF格式的帮助文件。现在我在linefit包中的LineFit.class中尝试打开帮助PDF：

I am trying to open a PDF file that is packaged into the jar file during runtime. The basic idea is that the user clicks the help option and then it displays a help file that is a PDF. Right now I have this in LineFit.class in the linefit package to try and open the help PDF:

try {
  File test = new File(LineFit.class.getClass().getResource("/linefit/helpTest.pdf").toURI());
  try {
      Desktop.getDesktop().open(test);
  } catch (IOException e1) {
      // TODO Auto-generated catch block
      e1.printStackTrace();
  } 
} catch (URISyntaxException e2) {
  // TODO Auto-generated catch block
  e2.printStackTrace();
}

当我运行它时它在eclipse中工作但是如果我尝试将它导出到一个可运行的JAR文件，它不会打开PDF文件，当我查看JAR时，PDF与eclipse中的文件夹在同一文件夹中。

It works in eclipse when I run it but if I try to export it to a runnable JAR file it does not open the PDF file and when I look into the JAR, the PDF is in the same folder as when it was in eclipse.

答

新文件（URI）仅适用于文件： URI。当类加载器在jar中找到资源时，它返回一个 jar URI，例如 jar：file：/ C：/ Program％20Files / test .jar！/ foo / bar 。

new File(URI) only works for file: URIs. When a classloader finds a resource in a jar, it returns a jar URI, for example jar:file:/C:/Program%20Files/test.jar!/foo/bar.

从根本上说，文件类适用于文件系统上的文件。您不能使用它来表示JAR或其他存档中的文件。您将不得不将文件从jar中复制到常规文件中，然后创建引用此新文件的文件。要从jar中读取文件，可以使用 JarURLConnection。带有您的URL的getInputStream ，或者您可以调用 ClassLoader.getResourceAsStream 。

Fundamentally, the File class is for files on the filesystem. You can't use it to represent a file within a JAR or another archive. You're going to have to copy the file out of the jar and into a regular file, then create a File referencing this new file. To read the file from the jar, you could use JarURLConnection.getInputStream with the URL you have, or you could call ClassLoader.getResourceAsStream.

打开打包在JAR中的PDF文件

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