CODEWITHSUNDEEP
java
joesan
joesan

Reputation: 15385

Load a file outside of a Jar

I have a folder called lib that contains all my Jar files and in one of the Jar files class, I have a main method which is called by a batch file. In the same folder location as my lib, I have another folder structure path/to/a/resource/myresource.txt

How can I load this file from a class inside the Jar file? I tried the following and both resulted in null:

getClass().getResource("path/to/a/resource/myresource.txt")
getClass().getClassLoader().getResource("path/to/a/resource/myresource.txt")

Any ideas? Even with an absolute path, it failed! Any suggestions?

Upvotes: 1

Views: 1517

Answers (5)

JamesB
JamesB

Reputation: 7894

You can use:

getClass().getResourceAsStream("path/to/a/resource/myresource.txt")

However, for this to work, you need to add the path '.' to the Class-Path entry of the JAR's MANIFEST.MF file.

http://docs.oracle.com/javase/tutorial/deployment/jar/downman.html

Upvotes: 1

user3458
user3458

Reputation:

You can either load the file from file system 

new FileReader(relativeOrAbsoluteFilesystemLocation)

or you can add the directory in question to your classpath:

java -cp "lib/*;lib" ...

and then use your original method.

(Unix uses : rather than ; as classpath separator)

Upvotes: 0

peter_the_oak
peter_the_oak

Reputation: 3710

Your path seems not to be precise enough. Further, this question has been worked before.

Have a look here:

How to Load File Outside of, but Relative to, the JAR?

How to get the path of a running JAR file?

Upvotes: 0

AlexWien
AlexWien

Reputation: 28727

File file = new File("C:/folder/myFile.txt");

or if you know the relative path:

 File file = new File("../../path/myFile.txt");

Upvotes: 0

Sanjeev
Sanjeev

Reputation: 9946

Two things you tried are used to read files from class-path since this folder is not on your classpath you can read it directly with any of the java File IO classes.

Upvotes: 0

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