Question

I have a huge program that I have spent 100+ hours on. It would not work when I exported it even though it worked fine in Ecipse. I made a smaller program with just that code to test it out. I have searched and changed my code and I still can’t get my program to work when I export and run my jar file. It works great in Eclipse. I have tried file reader, stream, buffer, standing on my head, and changed to anything I have seen online about reading a file that is included in the jar file. I am new to coding so some things still confuse me. I changed the .java to .zip and looked at the pieces and the file is in there.

My read code is

private void readFile(){
    try {
        System.out.println("starting array");       
        String[] myarray;  
        myarray = new String[5];  
        System.out.println("myarray"+myarray);  
        url = getClass().getResource("classifyinginfo.txt"); 
        System.out.println("url is "+url);
        readbuffer = new BufferedReader(new FileReader(url.getPath()));          
        line1 = readbuffer.readLine();
        line1 = readbuffer.readLine();                  
        line1 = readbuffer.readLine();                  
        line1 = readbuffer.readLine();                                      
        { String splitarray[] = line1.split(",");
            firstentry = splitarray[0];
            myarray[0]=splitarray[3];
            myarray[1]=splitarray[4];
            myarray[2]=splitarray[5];
            myarray[3]=splitarray[6];
            myarray[4]=splitarray[7]; 

            //line2 and 3 readbuffer etc

            Arrays.sort(myarray);
            for(int i=0; i < myarray.length; i++){
                System.out.println(myarray[i]);

                textArea.append(myarray[i]+"\n");}
        }       


        System.out.println(Arrays.toString(myarray)); 
        //  textArea.setText(Arrays.toString(myarray));


        readbuffer.close(); } catch (IOException e) {
        System.out.println("we have an error");}           
    System.out.println("Line: " + line1 );
} 

please please tell me how to make this work in and out of Eclipse.

Answer 1

You just do like this:

url = getClass().getResource("classifyinginfo.txt"); 
readbuffer = new BufferedReader(new InputStreamReader(url.openStream()));          
line1 = readbuffer.readLine();

The FileReader class can read individual files on disk, and that’s all. But you don’t need to use it once you have a URL. Modified in this way, the program will work whether the file is in a jar or not.

You can actually eliminate the URL altogether and just do this:

readbuffer =
    new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("classifyinginfo.txt")));          
line1 = readbuffer.readLine();