File contents reset when file exists already

Newbie & Debugging Questions
#1 
	private void initFiles() throws IOException {
		String path = Main.class.getProtectionDomain().getCodeSource()
				.getLocation().getPath();
		String decodedPath = URLDecoder.decode(path, "UTF-8");

		File clientConfig = new File(decodedPath + "clientConfig.cfg");
		boolean existed = true;

		if (!clientConfig.exists()) {
			clientConfig.createNewFile();
			existed = false;
		}

		BufferedWriter cfgWriter = new BufferedWriter(new FileWriter(
				clientConfig));

		if (!existed) {
			cfgWriter.write("127.0.0.1:10008");
		    cfgWriter.flush();
		}

		BufferedReader cfgReader = new BufferedReader(new FileReader(
				clientConfig));

		String serverInfo[] = cfgReader.readLine().split(":");

		host = serverInfo[0];
		port = Integer.parseInt(serverInfo[1]);

		cfgReader.close();
		cfgWriter.close();
	}

I believe that the title should be self explanatory, when I execute the jar without the clientConfig.cfg it works fine, but when it exists already its contents are reset and that causes the rest of the code to stop working

#2

Because when you open it with the buffered writer you override your file with an empty one.

You should use NIO2 to have more controll, i.e. :


        Path a = Paths.get("file.xyz");
        Files.newBufferedWriter(a, Charset.defaultCharset(), StandardOpenOption.TRUNCATE_EXISTING);

there are other options which create new file everytime or only if it does not exist already and so on

#3

I don’t believe NIO2 is the answer here. If he doesn’t want to write anything, he shouldn’t open a file for writing. Move the FileWriter code inside the [icode]if(!existed)[/icode] block.

#4

Thanks Riven!