Spring cannot find the file via specified path - spring

Question

My files hierarchy:
>resources:
>static:
>css:
>json:
>networks:
>network-list.json
>js:
>img:
I've tried to create a new file via:
File jsonNetworkDetailsFile = new File("/json/networks/network-list.json");
File jsonNetworkDetailsFile = new File("static/json/networks/network-list.json");
File jsonNetworkDetailsFile = new File("../json/networks/network-list.json");
File jsonNetworkDetailsFile = new File("../../json/networks/network-list.json");
File jsonNetworkDetailsFile = new File("/json/networks/network-list.json");
...and some more. None of it works.
I'm still getting the
java.io.FileNotFoundException: the system cannot find the path specified
What's the proper way?
EDIT
Found a solution. Had to include full path to the file like:
File jsonNetworkDetailsFile = new File("src/main/resources/static/json/networks/Turtlecoin/turtlecoin-pools.json");
EDIT2
As TwiN stated - it's impossible to reference a file through File object as soon as the app is packed into .jar. A proper solution would include:
InputStream jsonNetworkDetailsFile = new ClassPathResource("/static/json/networks/network-list.json").getInputStream();

Answer 1

InputStream is = new ClassPathResource("/someFile.txt").getInputStream();
where /someFile.txt is in your resources folder.
As mentioned in the documentation for ClassPathResource:
Supports resolution as java.io.File if the class path resource resides
in the file system, but not for resources in a JAR. Always supports
resolution as URL.
In other words, you'll want to use the getInputStream() method for your case:
InputStream is = new ClassPathResource("/someFile.txt").getInputStream();
try {
String contents = new String(FileCopyUtils.copyToByteArray(is), StandardCharsets.UTF_8);
System.out.println(contents); // do something with the content here
is.close();
} catch (IOException e) {
e.printStackTrace();
}
I'm mentioning this because ClassPathResource also has a getFile() method.
For more details, see reference

Answer 2

Try something like this :
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("classpath:static/json/networks/network-list.json").getFile());
You could also use :
#Value(value = "static/json/networks/network-list.json")
private Resource myFile;
And then :
myFile.getInputStream()
(will only work on a class annoted with #Component, #Service... etc)

Answer 3

you can try this to load files from ressources :
ClassLoader loader = Thread.currentThread().
getContextClassLoader();
InputStream configStream = loader.getResourceAsStream("/static/json/networks/network-list.json");

Answer 4

I think you should give the exact location to File object. Another solution:
File currDir = new File(".");
String path = currDir.getAbsolutePath();
// String path = "C:\\ExternalFiles\\"; // Or you can give staticly
File jsonNetworkDetailsFile = new File(path);
Hope it helps.