How to use

setResource

method

in

org.springframework.batch.item.file.ResourceAwareItemWriterItemStream

  /**
   * Create output resource (if necessary) and point the delegate to it.
   */
  private File setResourceToDelegate() throws IOException {
    String path = resource.getFile().getAbsolutePath() + suffixCreator.getSuffix(resourceIndex);
    File file = new File(path);
    delegate.setResource(new FileSystemResource(file));
    return file;
  }
}

/**
 * Create output resource (if necessary) and point the delegate to it.
 */
private File setResourceToDelegate() throws IOException {
  resource = resourceLocator.getResource(executionContext);
  delegate.setResource(resource);
  LOGGER.debug("Setting resource={} to delegate", resource != null ? resource.getFile().getAbsolutePath() : "null");
  return resource.getFile();
}

private void initializeStreams() throws Exception {
  if (createBackupFile) {
    outputResource = new FileSystemResource(File.createTempFile(resource.getFilename(), ".tmp", resource.getFile().getParentFile()));
  } else {
    outputResource = resource;
  }
  reader.setResource(resource);
  writer.setResource(outputResource);
}

  /**
   * Create output resource (if necessary) and point the delegate to it.
   */
  private File setResourceToDelegate() throws IOException {
    String path = resource.getFile().getAbsolutePath() + suffixCreator.getSuffix(resourceIndex);
    File file = new File(path);
    delegate.setResource(new FileSystemResource(file));
    return file;
  }
}

@Override
public void write(List<? extends ExcelRow> items) throws Exception {
  if (!initialized && items.size() > 0) {
    SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
    String suffix = format.format(items.get(0).getDate());
    File file = ExcelFileUtils.getFile(new File(directoryPath), fileName, suffix, fileExtension);
    delegate.setResource(new FileSystemResource(file));
    delegate.open(executionContext);
    initialized = true;
  }
  delegate.write(items);
}

@Override
protected void doOpen() throws Exception {
  if (executionContext.containsKey(getExecutionContextKey(RESOURCE_KEY))) {
    resource = new FileSystemResource(executionContext.getString(getExecutionContextKey(RESOURCE_KEY), ""));
    // It's a restart
    delegate.open(executionContext);
    delegate.setResource(resource);
    // We don't have to create the resource
    opened = true;
    LOGGER.trace("Stream is opened");
  } else {
    opened = false;
    LOGGER.trace("Stream is not opened yet");
  }
}