Eclipse 无法读取 src 文件夹中的文本文件

Question

I am implementing a Branch Predictor for one of my classes and I am trying to read files from my src folder in Eclipse but for some reason it is not able to open the files. I have done this before with the exact same process so I'm not sure what is different.

traceFile is set from the command line and if I print "input", it will print out the correct file path and I have confirmed it is there manually.

ClassLoader loader = BiModalPredictor.class.getClassLoader();
File input = new File(loader.getResource(traceFile).getFile());
Scanner fin = new Scanner(input);

Is there any insight as to why this might be happening? I've tried restarting Eclipse, refreshing the files, and I've also tested it on another program which worked. No idea why it can't find this file.

Answer 1

Resources on the classpath, ie available through the classloaders getResource method, will not be files on the file system when your application is deployed as a jar file, or deployed in general. Do not use File with such resources, instead use getResourceAsStream to access the resource content.

Besides, your code is wrong. getResource() returns a URL . If you want a File object from a URL , you should use new File(uri) , where the URI is obtained by calling url.toURI() .

File input = new File(loader.getResource(traceFile).toURI());