I'm getting FileNotFoundException while running a war

问题

Here is a code line, which I use to access xml file.

Contacts contactsEntity = (Contacts) um.unmarshal(new FileReader(new File(classLoader.getResource("Contacts.xml").getFile())));

Here is what I get while running a war:

java.io.FileNotFoundException: file:\D:\apache-tomcat-8.0.50\webapps\pb\WEB-INF\lib\phonebook-server-0.0.1-SNAPSHOT.jar!\Contacts.xml (The filename, directory name, or volume label syntax is incorrect)

P.S. It is 100% not an issue with file access, because I made a simple project which generates JAXB classes, unmarshals the same xml from resources folder and everything works fine.

Here is a structure of project:

回答1:

You've tagged spring, so I assume you can use it.

Does your war get unpacked after deployment (e.g. by Tomcat)?

If yes,

Use ClassPathResource#getFile()

Your problem is the String that gets returned by getFile(). It contains an exclamation mark (!) and a file: protocol. You could handle all that yourself and implement your own solution for this, but this would be reinventing the wheel.

Fortunately, Spring has a org.springframework.core.io.ClassPathResource. To get the file, simple write new ClassPathResource("filename").getFile(); In your case, you need to replace

Contacts contactsEntity = (Contacts) um.unmarshal(new FileReader(new File(classLoader.getResource("Contacts.xml").getFile())));

with

Contacts contactsEntity = (Contacts) um.unmarshal(new FileReader(new ClassPathResource("Contacts.xml").getFile()));

Now your program should also work when it's deployed and unpacked.

If no (recommended, use this if you're not sure),

You have to use an InputStream, as the resource doesn't exist as a file on the filesystem, but is rather packed inside of an archive.

This should work:

Contacts contactsEntity = (Contacts) um.unmarshal(new InputStreamReader(new ClassPathResource("Contacts.xml").getInputStream()));

(without Spring):

Contacts contactsEntity = (Contacts) um.unmarshal(new InputStreamReader(classLoader.getResourceAsStream("Contacts.xml")));

来源：https://stackoverflow.com/questions/49445042/im-getting-filenotfoundexception-while-running-a-war