Java: use URL object for File object

Question

I want to read some data for my app. Here my code:

 URL url = Myclass.class.getResource("/data/file.txt"); //Myclass is my class name
    File file = new File(url.toString());  //maybe I met error here. 
//File Constructor just receive String object, I don't know how to convert
    FileInputStream reader = new FileIputStream(file);

I don't know how to change url to File to read it. Please tell me how to solve.

Thanks :)

Looking for stackoverflow.com/questions/10006098/… ?

Ravindra Gullapalli
– Ravindra Gullapalli

2012-04-13 10:23:52 +00:00
Commented Apr 13, 2012 at 10:23 — Ravindra Gullapalli
– Ravindra Gullapalli, Commented Apr 13, 2012 at 10:23

hqt · Accepted Answer · 2014-03-14 08:24:19Z

1

You can't read a resource as if it were a file. The following syntax should work:

InputStream resource = MyClass.class.getResourceAsStream("/data/file.txt");

To avoid relative / absolute path issues, you can also use:

InputStream resource = MyClass.class.getClassLoader().getResourceAsStream("/data/file.txt");

edited Mar 14, 2014 at 8:24

hqt

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answered Apr 13, 2012 at 9:37

assylias

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8 Comments

hqt Over a year ago

I meet error: FileNotFound Exception, although I'm sure that file.txt in data folder

assylias Over a year ago

How about getResourceAsStream("data/file.txt");? (without the leading /)

hqt Over a year ago

Yes. I still meet this error. I can use getresource when I load an image:Toolkit.getDefaultToolkit().getImage(View.class.getResource("/data/icon.png"));

assylias Over a year ago

See my edit. You can also have a look at stackoverflow.com/questions/873960/…

Andrew Thompson Over a year ago

"although I'm sure that file.txt in data folder" Test it by looking inside the Jar. (Sheesh..)

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