Writing to a file in Java with

Question

I'm trying to print out some stock market information to a file. I take information from a URL, and put that into a csv. Right now it's giving me this error message:

ERROR, make sure no other processes are using dumpFile\DIS.csv and run program again
dumpFile\DIS will be skipped or innacurate
java.io.FileNotFoundException: dumpFile\DIS.csv (The system cannot find the path specified)

the code in question is this:

    DataInputStream in=null;
    FileOutputStream fOut = null;
    DataOutputStream out = null;
    String fileName = getDataFolder()+File.separator+symbol+".csv";

    try {
        URL remoteFile = new URL(downloadURL);
        URLConnection fileStream = remoteFile.openConnection();
        in = new DataInputStream(new BufferedInputStream(
                fileStream.getInputStream()));

        fOut = new FileOutputStream(fileName);
        out = new DataOutputStream(new BufferedOutputStream(fOut));

        int data;
        while ((data = in.read()) != -1) {
            out.write(data);
            //System.out.println(data);
        }
    }

The downloadURL variable is the url I want to download from and I know that is correct. The getDataFolder returns "dumpFile". Symbol is the symbol for the company on the stock market, GOOG, DIS, etc... In the call which generated the error message I showed I was calling it with symbol = "DIS". This is mostly code from my prof so I'm not 100% sure how it actually works but I think what it should do is make a file called "dumpFile"+symbol+".csv" and write to that. Am I wrong in that? As to the part about making sure it isn't open somewhere else, I don't have it open anywhere on my computer, I don't even have a file called dumpFile\DIS.csv.

Answer 1

Make sure the directory "dumpFile" exists. If getDataFolder() can sometimes return something other than "dumpFile", do something like the following:

File folder = new File(getDataFolder());
if(!folder.exists()){
  folder.mkdir();
}