Java - Write CSV File with Apache.commons.csv
<p>I'm using the <a href="https://commons.apache.org/proper/commons-csv/" rel="noreferrer">apache.commons.csv library in Java</a>. I'm reading a CSV file from a web page with this code:</p>

<pre><code>InputStream input = new URL(url).openStream();
        Reader reader = new InputStreamReader(input, "UTF-8");

        defaultParser = new CSVParser(reader, CSVFormat.DEFAULT);
        excelParser = new CSVParser(reader, CSVFormat.EXCEL.withHeader()); 

        defaultParsedData = defaultParser.getRecords();
        excelParsedData = excelParser.getRecords();
</code></pre>

<p>However, I can't find a method in this library to easily write this file to my computer in order to open it up and read from it later on.</p>

<p>I tried this code to save the file.</p>

<pre><code>String outputFile = savePath+".csv";
        CSVPrinter csvFilePrinter = null;
        CSVFormat csvFileFormat = CSVFormat.EXCEL.withHeader();
        FileWriter fileWriter = new FileWriter(outputFile);
        csvFilePrinter = new CSVPrinter(fileWriter, csvFileFormat);

        for (CSVRecord csvRecord : excelParser) {
            for(String dataPoint: csvRecord){
                csvFilePrinter.print(dataPoint);
            }
            csvFilePrinter.print('\n');
         }

        fileWriter.flush();
        fileWriter.close();
        csvFilePrinter.close();
</code></pre>

<p>However, when I try to read the file with this code, nothing prints out:</p>

<pre><code>InputStream input = new FileInputStream(cvsFilePath);
        Reader reader = new InputStreamReader(input, "UTF-8");

        CSVParser load = new CSVParser(reader, CSVFormat.EXCEL);
        //TEST THAT IT WORKED
        java.util.List&lt;CSVRecord&gt; testlist = load.getRecords();
        CSVRecord dataPoint = testlist.get(0);
        System.out.println("print: " + dataPoint.get(0));
</code></pre>

<p>This only prints out "print: "
If I add </p>

<pre><code>System.out.println("print: " + dataPoint.get(1));
</code></pre>

<p>it gives a </p>

<blockquote>
  <p>Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1</p>
</blockquote>

<p>When I open the saved CSV file with notepad there is a blank line and then:</p>

<blockquote>
  <p>2016-03-04,714.98999,716.48999,706.02002,710.890015,1967900,710.890015,"
  ",2016-03-03,718.679993,719.450012,706.02002,712.419983,1956800,712.419983," ",2016-03-02,719.00,720.00,712.00,718.849976,1627800,718.849976,"</p>
</blockquote>