code: public <T> HSSFWorkbook object2Excel(List<T> list, String propertyKeys, String propertyShowKeys)
        throws Exception {
      return object2Excel(list, propertyKeys, propertyShowKeys, new DefaultPropertyExtractor());
  
    }
docs: <p>
  object2Excel.
  </p>
  
  @param list a {@link java.util.List} object.
  @param propertyKeys a {@link java.lang.String} object.
  @param propertyShowKeys a {@link java.lang.String} object.
  @param <T> a T object.
  @return a {@link org.apache.poi.hssf.usermodel.HSSFWorkbook} object.
  @throws java.lang.Exception if any.