Java 8: Reading a file into a String

Question

I have a json file in the same package of the controller, and I try to read the file and convert it into String

new String(Files.readAllBytes(Paths.get("CustomerOrganization.json")));

But I got an error:

java.nio.file.NoSuchFileException: CustomerOrganization.json

You have to provide the full path, I think. Where (on your file system) is that file stored? — deHaar
– deHaar, Commented Jul 24, 2019 at 7:52
The path is not relative to the location of your class, but to the location where the program is run. Typically this is the root of the project. — Jonas Berlin
– Jonas Berlin, Commented Jul 24, 2019 at 7:53
you could also try giving reative path from root of project like src/.../controllers/CustomerOrganization.json — Michał Krzywański
– Michał Krzywański, Commented Jul 24, 2019 at 7:54
If you want to find out the path to a file relative to your class, you can use CustomerControllerIT.class.getResource("CustomerOrganization.json") — Jonas Berlin
– Jonas Berlin, Commented Jul 24, 2019 at 7:54
If you expect it in the same package, you should be using resources, not files. — RealSkeptic
– RealSkeptic, Commented Jul 24, 2019 at 7:55

Jonas Berlin · Accepted Answer · 2019-07-24 08:40:43Z

15

Using mostly the same methods you used:

new String(Files.readAllBytes(Paths.get(CustomerControllerIT.class.getResource("CustomerOrganization.json").toURI())));

However, if you need it to work from inside a JAR, you will need to do this instead:

InputStream inputStream = CustomerControllerIT.class.getResourceAsStream("CustomerOrganization.json");
// TODO pick one of the solutions from below url
// to read the inputStream into a string:
// https://stackoverflow.com/a/35446009/1356047

edited Jul 24, 2019 at 8:40

answered Jul 24, 2019 at 7:56

Jonas Berlin

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6 Comments

Jonas Berlin Over a year ago

True, but this was not requested in the question.

RealSkeptic Over a year ago

Nevertheless, if the OP is going to deploy it, it will end up in a Jar. Any solution involving resources should not mix in files, as a project is almost never going to end up deployed as files.

Jonas Berlin Over a year ago

True, added JAR solution as well.

Holger Over a year ago

The URI detour would even work from a jar, when you create the filesystem first. But it must be emphasized that the String(byte[]) constructor will use the system’s default encoding which surely isn’t the right choice for a resource embedded in a Java application. The application should be explicit regarding the resource’s encoding.

AlikElzin-kilaka Over a year ago

What about the encoding?

|

Sukriti Sarkar · Accepted Answer · 2019-07-24 08:07:27Z

4

You have to give the full path as URI like my below code snippet where the json file is in the same package.

try {
        String s = new String(Files.readAllBytes(Paths.get("D:/Test/NTech/src/com/ntech/CustomerOrganization.json")));
        System.out.println(s);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

For more information you can go through the public static Path get(URI uri) method documentation of the Paths class from: https://docs.oracle.com/javase/8/docs/api/java/nio/file/Paths.html

answered Jul 24, 2019 at 8:07

Sukriti Sarkar

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Comments

Asim Irshad · Accepted Answer · 2019-07-24 13:21:30Z

2

Below code snippet should work for you.

Path path = Paths.get(CustomerControllerIT.class.getClassLoader().getResource(fileName).toURI());
byte[] fileBytes = Files.readAllBytes(path);
String fileContent = new String(fileBytes);

answered Jul 24, 2019 at 13:21

Asim Irshad

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