以java.io.File对象的形式读取位于jar中的文件

Question

Similar questions to this one were posted, but none of the answers seems to help in my case. I am writing a package that uses Google's credentials to obtain Google Apps users. For this, I am using a service account, and so in order to retrieve the credentials, I need to provide (among others) a p12 signature file:

   Credential credential = null;
    try {
        credential = new GoogleCredential.Builder().setTransport(httpTransport)
                .setJsonFactory(jsonFactory)
                .setServiceAccountId(serviceAccountEmail)
                .setServiceAccountScopes(SCOPES)
                .setServiceAccountUser(serviceAccountUser)
            .setServiceAccountPrivateKeyFromP12File( java.io.File ))

The last function must receive a java.io.File object of the p12 signature file. Now, this whole thing runs inside a jar I am providing to others, and that creates most of the problems. I couldn't read the file when running inside the jar no matter which approach I took. Among things I tried:

return new File(GoogleUserFactory.class.getClassLoader().getResource("/" +  filePath).toURI()); 

// (I also tried without the "/" and using class.GetResource() directly)

URL url = GoogleUserFactory.class.getResource("/" + filePath);
return new File(url.getPath());  

// I also tried class.GetClassLoader.GetResource()...

Even tried to read the file as a InputStreamReader and write to a new File (which after I will create a File object for and return it), but since I am in a jar, I cannot seem to have permissions to write a new file)

Answer 1

可能是你可以使用.setServiceAccountPrivateKey(SecurityUtils.loadPrivateKeyFromKeyStore(SecurityUtils.getPkcs12KeyStore(), SOME_INPUT_STREAM, "notasecret", "privatekey", "notasecret");作为建议在这里 ？

Answer 2

Please try without getClassLoader(). Probably you tried it. but it must work. if you receive NullPointerException filePath can be wrong.

File file = new File(GoogleUserFactory.class.getResource("/" + filePath).toURI());