public ExcelWriter flush(OutputStream out, boolean isCloseOut) throws IORuntimeException {
		Assert.isFalse(this.isClosed, "ExcelWriter has been closed!");
		try {
			this.workbook.write(out);
			out.flush();
		} catch (IOException e) {
			throw new IORuntimeException(e);
		} finally {
			if (isCloseOut) {
				IoUtil.close(out);
			}
		}
		return this;
	}
public ExcelWriter flush ( OutputStream out , boolean isCloseOut ) throws IORuntimeException { Assert . isFalse ( this . isClosed , "ExcelWriter has been closed!" ) ; try { this . workbook . write ( out ) ; out . flush ( ) ; } catch ( IOException e ) { throw new IORuntimeException ( e ) ; } finally { if ( isCloseOut ) { IoUtil . close ( out ) ; } } return this ; }
将Excel Workbook刷出到输出流

@param out 输出流
@param isCloseOut 是否关闭输出流
@return this
@throws IORuntimeException IO异常
@since 4.4.1