Java InputStream fails to read file from within JAR

Question

I am trying to read a file from my executable .jar file but it keeps getting null values.

I have this code:

public DanceEventTicketScanner(String txtfile){
    sv = new ScannerView(this);
    findcode = false;
    InputStream is = this.getClass().getResourceAsStream("/resources/copy.csv");
    if (is == null) JOptionPane.showMessageDialog(null, "Resource not located.");
}

In the JAR file i have (as normal) a folder containing all my .class files and in the same directory a folder named resources which holds the copy.csv file.

This code however does not recognize the file.

Does anyone have any ideas?

Related question: http://stackoverflow.com/questions/3369794/how-can-i-read-file-from-jar-in-java — , Mar 05 '13 at 18:36
In the same directory as what? /resources would need to be in the root of the JAR file for your code to work. — user207421, Mar 06 '13 at 00:17

score 4 · Answer 1 · edited May 01 '19 at 22:30

4

Remove the first slash:

InputStream is = this.getClass().getResourceAsStream("resources/copy.csv");

edited May 01 '19 at 22:30

Laurel

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answered Mar 05 '13 at 18:40

A4L

17,353
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score 2 · Answer 2 · answered Mar 05 '13 at 18:42

2

getClass().getResourceAsStream(..) will use a path relative to the class (so inc. package dirs). getClass().getClassLoader().getResourceAsStream(..) will use an absolute path. So change your code and get the class loader and it will work.

answered Mar 05 '13 at 18:42

Zubzub

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so if i use the second one you said, would i still be just giving "/resources/copy.csv" as the parameter? – user1604443 Mar 05 '13 at 18:43
2

This answer is not correct. See the Javadoc. If an absolute path is specified it will use it. – user207421 Mar 06 '13 at 00:17

Java InputStream fails to read file from within JAR

2 Answers2

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