How to read/write in java to a file which is in NetBeans project itself

Question

I did search to find a solutions for this issue but I could not get proper ansewer.

My problem is I have a NetBeans project which has following folder structure.

MyProject

      Source Packages
      ---------------
                     controller 
                     .
                     .
                     .
                     .
                     databaseconfiguration
                     application
                          Application.java
                     source
                          DbConfig.txt

DbConfig.txt is in source . Application.java is in application

in Application.java I do read DbConfig.txt. as following code

String path = ClassLoader.getSystemResource("source/DbConfig.txt").getPath();

File f = new File(path);
        fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        while (br.ready()) {
            String line = br.readLine();
            if(line.isEmpty()){
                continue;
            }
            else{
         JOptionPane.showConfirmDialog(null,line);
        }

}

this is working fine when I run in Netbeans IDE.

But after building , when I try to run this using MyProject.jar it gives null pointer exception (java -jar MyProject.jar in cmd)

Please tell me how to sort out this problem. Thanks in advance.

score 1 · Answer 1 · edited May 23 '17 at 12:31

1

As long as your file is in classpath, just use ClassLoader to return an InputStream for the resource instead of using it as a File ( you cannot read the resources from within the jar as simple Files)

InputStream in = getClass().getResourceAsStream(path); 
BufferedReader reader = new BufferedReader(new InputStreamReader(in));

More information here How do I read a resource file from a Java jar file?

edited May 23 '17 at 12:31

Community

1
1

answered Mar 24 '16 at 11:52

ingrid.e

531
2
11

Thanx for the answering .I am still getting the issue even I change the way you said. – Lasan Mar 24 '16 at 12:22
can you post the update on the ticket with how and what you tried? – ingrid.e Mar 24 '16 at 14:10

Gokul · Answer 2 · 2016-03-24T11:55:28.190

0

In the folder, from where you are running MyProject.jar, create another folder named "source" and in "source" place the file "DbConfig.txt"

Your directory should look something like this

../SomeFolder
--------------
              MyProject.jar
              .
              .
              .
              source
                    DbConfig.txt

edited Mar 24 '16 at 11:55

answered Mar 24 '16 at 11:48

Gokul

455
6
17

How to read/write in java to a file which is in NetBeans project itself

MyProject

2 Answers2