Re: How to include a text file in my executable JAR file?

From:

Jeff Higgins <jeff@invalid.invalid>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 23 Aug 2012 11:51:08 -0400

Message-ID:

<k15jh0$vjj$1@dont-email.me>

On 08/23/2012 11:23 AM, Jan Burse wrote:

Try:
URLConnection con = myUrl.openConnection();
InputStream in = con.getInputStream();

You can then copy from the in, via a Java loop.

zyng schrieb:

Hi:

My Java program needs to access a text file(in fact, the Java code
will use Linux System command "cp" to copy this text file to a
destination folder during running). Suppose this is my Java program
HelloWorld.java:

package aa.bb.cc;

public class HelloWorld
{
...

public static void main(final String[] args)
{
final URL myUrl =
this.getClass().getClassLoader().getResource("namelist.txt");

final File nameFile = new File(myUrl.getPath());
if(windowlayoutFile.exists() == false)
{
System.out.println(nameFile.getAbsolutePath() + " does not exist!!!");
}
else
{
System.out.println(nameFile.getAbsolutePath() + " exists");
}
}
}

This is the directory and file structure in my file system:
/HOME/java_project/src/aa/bb/cc/HelloWorld.java
/HOME/java_project/build/aa/bb/cc/HelloWorld.class
/HOME/java_project/nonsrc/namelist.txt

In Eclipse, I have added nonsrc as "external class folder" and the
code above works!

Eclipse has added nonsrc to the classpath
and getResource is able to find it.

Use a relative URL?

The output is:

/HOME/java_project/nonsrc/windowlayout.xml exists
I am still not clear why use "external class folder", but it works in
Eclipse.

Now, my problem is when creating an executable JAR
file(helloworld.jar), my JAR content is(shown by the command "jar tf
helloworld.jar"):
aa/bb/cc/HelloWorld.class
namelist.txt

Now, if i am at /HOME/test directory and the JAR file is here too:
java -jar helloworld.jar

This is the confusing output:
/HOME/test/file:/HOME/test/robot.jar!/namelist.txt does not exist!!!

The answers by Google just do not give me a clear whole picture of
what is going on. (I don't want to put namelist.txt at the same
package location as HelloWorld.java. I guess, if I do that, I maybe
able to make it work by myself)

I am surprised by an exclamation shown in the file path too. I have
never used the class URL in the past, which is used in my code now.

Thank you very much.