Including a text file inside a jar file and reading it [duplicate]

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Java resource as file

I am kind of new to Java and I am trying to get a text file inside a Jar file.

At the moment when I execute my jar I have to have my text file in the same folder as the jar fil. If the text file is not there I'll get a NullPointerException, which I want to avoid.

What I want to do is to get the txt file inside the jar so I wont have this problem. I tried some guides but they didn't seem to work. My current read function goes like this:

public static HashSet<String> readDictionary() { HashSet<String> toRet = new HashSet<>(); try { // Open the file that is the first // command line parameter FileInputStream fstream = new FileInputStream("Dictionary.txt"); try (DataInputStream in = new DataInputStream(fstream)) { BufferedReader br = new BufferedReader(new InputStreamReader(in)); String strLine; //Read File Line By Line while ((strLine = br.readLine()) != null) { // Read Lines toRet.add(strLine); } } return toRet; } catch (Exception e) {//Catch exception if any System.err.println("Error: " + e.getMessage()); } return null; }

Rohit Mistry · Accepted Answer · 2019-06-23 19:02:33Z

Don't try to find a file as a "file" in a Jar file. Use resources instead.

Get a reference to the class or class loader and then on the class or class loader call getResourceAsStream(/* resource address */);.

See similar questions below (avoid creating new questions if possible):

Community · Accepted Answer · 2017-05-23 12:10:51Z

// add a leading slash to indicate 'search from the root of the class-path' URL urlToDictionary = this.getClass().getResource("/" + "Dictionary.txt"); InputStream stream = urlToDictionary.openStream();

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