Getting the string values of an enum

Question

I want to make a program that downloads some files that are needed to run a gain. It's like a launcher that automatically downloads updates. This is the enum I have:

public class Configuration {

    public enum downloadFiles {
        load1 ("load1.png", "https://dl.dropboxusercontent.com/u/51947680/Xenolith/load1.png"),
        load2 ("load2.png", "https://dl.dropboxusercontent.com/u/51947680/Xenolith/load2.png"),
        load3 ("load3.png", "https://dl.dropboxusercontent.com/u/51947680/Xenolith/load3.png");

        public String fileName, URL;

        private downloadFiles(String fileName, String URL) {
            this.fileName = fileName;
            this.URL = URL;
        }

        public String getFileName() {
            return fileName;
        }

        public String getURL() {
            return URL;
        }

    }

}

I also have a class that downloads the files, which is:

public class DownloadUtility {
    private static final int BUFFER_SIZE = 4096;

    /**
     * Downloads a file from a URL
     * @param fileURL HTTP URL of the file to be downloaded
     * @param saveDir path of the directory to save the file
     * @throws IOException
     */
    public static void downloadFile(String fileName, String fileURL)
            throws IOException {
        URL url = new URL(fileURL);
        HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
        int responseCode = httpConn.getResponseCode();

        // always check HTTP response code first
        if (responseCode == HttpURLConnection.HTTP_OK) {
            String disposition = httpConn.getHeaderField("Content-Disposition");
            String contentType = httpConn.getContentType();
            int contentLength = httpConn.getContentLength();

            System.out.println("Content-Type = " + contentType);
            System.out.println("Content-Disposition = " + disposition);
            System.out.println("Content-Length = " + contentLength);
            System.out.println("fileName = " + fileName);

            // opens input stream from the HTTP connection
            InputStream inputStream = httpConn.getInputStream();
            String saveFilePath = System.getProperty("user.home") + "/Desktop" + File.separator + fileName;

            // opens an output stream to save into file
            FileOutputStream outputStream = new FileOutputStream(saveFilePath);

            int bytesRead = -1;
            byte[] buffer = new byte[BUFFER_SIZE];
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }

            outputStream.close();
            inputStream.close();

            System.out.println("File downloaded");
        } else {
            System.out.println("No file to download. Server replied HTTP code: " + responseCode);
        }
        httpConn.disconnect();
    }
}

So what I want to do is that the downloadFiles method downloads all the files in the enum sequentially. Btw is this a good way of doing this? If there is a better way, can you please tell me, because I'm trying to learn to code java in a neat way.

So which bit are you stuck on? It's not clear why you have an instance method called downloadFiles which takes a filename and a URL, despite the fact that the enum itself knows the file and URL... — Jon Skeet
– Jon Skeet, Commented Nov 18, 2015 at 20:06
I'm stuck on getting the downloadFile method to download the file from the link in the enum and saving it as the name that's in the enum. — RuuddR
– RuuddR, Commented Nov 18, 2015 at 20:09
Well it doesn't help that your enum has an unconventional name - that's what makes me think it was a method. But Enum.getValues is probably your friend... — Jon Skeet
– Jon Skeet, Commented Nov 18, 2015 at 20:12
What downloadFiles method? I see a downloadFiles enum, a downloadFiles constructor, and a downloadFile method. Is there another method? Where is it? — RealSkeptic
– RealSkeptic, Commented Nov 18, 2015 at 20:16
Okay, what should I name the enum? How should I make the for loop work? I'm thinking of something with for (i = 0; i < Configuration.DownloadFile.getLength; i ++), but that doesn't work. @RealSkeptic I meant downloadFiles method, should I name these things different? — RuuddR
– RuuddR, Commented Nov 18, 2015 at 20:16

Harsh Poddar · Accepted Answer · 2015-11-18 20:19:36Z

1

You can do the following:

for(Configuration.downloadFiles df : Configuration.downloadFiles.values()){
    DownloadUtility.downloadFile(df.getFileName(), df.getURL());
}

answered Nov 18, 2015 at 20:19

Harsh Poddar

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