在jar中访问pom.xml

Question

public static void main(String[] args) throws IOException {
    String filePath = args[0];
    JarFile jar = new JarFile(new File(filePath));
    Enumeration<JarEntry> zipEntries = jar.entries();
    String pomPath = null;
    for (JarEntry entry : Collections.list(zipEntries)) {
        if (entry.getName().contains("pom.xml")) {
            pomPath = entry.getName();
            System.out.println(pomPath);
        }
    }

}

now it prints out where the pom.xml located in jar file. META-INF/maven/~~~~/~~~~/pom.xml

And now I want to access to pom.xml file. I did some research and I think I need to use one of below

InputStream is = obj.getClass().getClassLoader().getResourceAsStream(pomPath);

when calling this, I don't know what to use for the calling obj, so I just set up null string as a calling object and it says null pointer exception.

Also, I saw somewhere that I need to use JarInputStream to access JarFile . But I have no idea using it. Help me!

Answer 1

Say you are in the class of the main, MainClass:

MainClass.class.getResourceAsStream("/....");

Mind that the path must start with a slash (absolute path), otherwise it would be relative to the package directory of that class.