I have looked at How to access resources in JAR file? and How do I copy a text file from a jar into a file outside of the jar? and many other questiions but couldnt actually get an answer. What I'm trying to do is copy contents of a file in res/CDC.txt that is in jar, to somewhere out of a jar. Now, on my computer it works but when I try it on different computer I get FileNotFoundException. So, I figured out why it works on mine. I have a CLASSPATH set to .;D:\myname\Java\JavaFiles where all my java files are located in packages. In "JavaFiles" directory there is also "res/CDC.txt". So, when I start my application, it first checks the current directory myapp.jar is located in for "res/CDC.txt", and then it checks "JavaFiles" and finds it. Other computers do not have it. So, this was my initial code:
public final class CT
{
//Other fields
private static CT ct;
private NTSystem nts;
private File f1;
private File f6;
private PrintWriter pw1;
private BufferedReader br1;
//Other fields
public static void main(String[] args)
{
try
{
showMessage("Executing program...");
ct = new CT();
ct.init();
ct.create();
ct.insertData();
//Other code
showMessage("Program executed!");
}
catch(Exception e)
{
showMessage("An exception occured! Program closed.");
e.printStackTrace();
System.exit(0);
}
}
private void init()
throws IOException
{
//Other initialization
nts = new NTSystem();
f1 = new File("C:\\Users\\" + nts.getName() + "\\blahblah");
f6 = new File("res\\CDC.txt");
br1 = new BufferedReader(new FileReader(f6));
//Other initialization
showMessage("Initialized");
}
private void create()
throws IOException
{
//Makes sure file/dir exists, etc
pw1 = new PrintWriter(new BufferedWriter(new FileWriter(f1)), true);
//Other Stuff
showMessage("Created");
}
private void insertData()
throws IOException
{
String line = br1.readLine();
while(line != null)
{
pw1.println(line);
line = br1.readLine();
}
//Other stuff
showMessage("Data inserted");
}
private static void showMessage(String msg)
{
System.out.println(msg);
}
}
which I changed to
public final class CT
{
//Other fields
private static CT ct;
private NTSystem nts;
private byte[] buffer;
private File f1;
private URL url1;
private FileOutputStream fos1;
private InputStream is1;
//Other fields
public static void main(String[] args)
{
try
{
showMessage("Executing program...");
ct = new CT();
ct.init();
ct.create();
ct.insertData();
//Other code
showMessage("Program executed!");
}
catch(Exception e)
{
showMessage("An exception occured! Program closed.");
e.printStackTrace();
System.exit(0);
}
}
private void init()
throws IOException
{
//Other initialization
nts = new NTSystem();
buffer = new byte[4096];
f1 = new File("C:\\Users\\" + nts.getName() + "\\blahblah");
url1 = getClass().getClassLoader.getResource("res\\CDC.txt"); //Also tried url1 = ct.getClass().getClassLoader.getResource("res\\CDC.txt"); or url1 = this.getClass().getClassLoader.getResource("res\\CDC.txt"); or url1 = CT.getClass().getClassLoader.getResource("res\\CDC.txt");
is1 = url1.openStream();
//Other initialization
showMessage("Initialized");
}
private void create()
throws IOException
{
//Makes sure file/dir exists, etc
pw1 = new PrintWriter(new BufferedWriter(new FileWriter(f1)), true);
//Other Stuff
showMessage("Created");
}
private void insertData()
throws IOException
{
int read = is1.read(buffer);
while(line != null)
{
fos1.write(buffer, 0, read);
read = is1.read(buffer);
}
//Other stuff
showMessage("Data inserted");
}
private static void showMessage(String msg)
{
System.out.println(msg);
}
}
And this time I always get NullPointerException. So, how to read folders and files that are within jar?
Thanks
