code: public void setExcludeFromExportColumns(final String[] excludeFromExportColumns) {
          if (excludeFromExportColumns != null) {
              this.excludeFromExportColumns = excludeFromExportColumns.clone();
          } else {
              this.excludeFromExportColumns = null;
          }
      }
docs: The columns names contained in the array will be igored if
  setExportOnlyColumns() is called.
  
  Any columns names contained in this list will be excluded from
  the export in Excel.
  
  @param excludeFromExportColumns the excludeFromExportColumns to set