Java POI: Convert Excel to CSV by XSSFReader

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1. 

  public String convertExcelToCsv(File uploadedFile, String reportType)
            throws InvalidFormatException, IOException, InterruptedException
    {
        logger.info(String
                .format("Start convertExcelToCsv, uploadedFile.name: [%s], reportTYpe: [%s]",
                        uploadedFile.getName(), reportType));

        String csvFileName = String.format("%s%s%s_%s.csv", tempCsvDir,
                File.separator, reportType, Calendar.getInstance()
                        .getTimeInMillis());

        BlockingQueue> rowDataQueue = new ArrayBlockingQueue>(
                10000);
        ExecutorService executorService = Executors.newFixedThreadPool(2);
        executorService.submit(new CustomizedXSSFReader(uploadedFile,
                rowDataQueue));
        executorService.submit(new CustomizedXSSFWriter(csvFileName,
                rowDataQueue));
        executorService.shutdown();

        while (!executorService.isTerminated())
        {
            logger.info("Main thread waits 1 more second for convertExcelToCsv");
            executorService.awaitTermination(1, TimeUnit.SECONDS);
        }

        logger.info(String.format(
                "Finished convertExcelToCsv, csvFileName: [%s]", csvFileName));
        return csvFileName;
    }

 

2. 

public class CustomizedXSSFReader implements Callable