从外部Jar文件中读取文件？ [英] Read a file from inside of an external Jar file?

问题描述

我正在尝试使用java读取外部jar文件中的文件。
例如，我有两个jar文件。一个是foo.jar，另一个是bar.jar。 bar.jar里面是文件foo-bar.txt。如何使用foo.jar中的代码从bar.jar中读取文件foo-bar.txt...？这甚至可能..？
我知道我可以从foo.jar中读取一个文件，使用

I'm trying to read a file from inside an external jar using java.. For example, I have two jar files. One is "foo.jar" the other is "bar.jar". Inside of "bar.jar" is the file "foo-bar.txt". How do i read the file "foo-bar.txt" from inside of "bar.jar" using code in "foo.jar"...? Is this even possible..? I know that i can read a file from iside of foo.jar using

this.getClass().getClassLoader().getResourceAsStream("foo-bar.txt");

但是我不知道如何从外部的jar里面执行。有人可以帮我吗？

But I don't know how to do it from an external jar.. can someone help me?

推荐答案

InputStream in = null;
String inputFile = "jar:file:/c:/path/to/my.jar!/myfile.txt";
if (inputFile.startsWith("jar:")){
  try {
    inputURL = new URL(inputFile);
    JarURLConnection conn = (JarURLConnection)inputURL.openConnection();
    in = conn.getInputStream();
  } catch (MalformedURLException e1) {
    System.err.println("Malformed input URL: "+inputURL);
    return;
  } catch (IOException e1) {
    System.err.println("IO error open connection");
    return;
  }
} 

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