请问easyexecl 分页写数据为0kb

ExcelWriter excelWriter = EasyExcel.write(outputStream).needHead(true).excelType(ExcelTypeEnum.XLSX).registerWriteHandler(new CustomCellWriteHandlerConfig()).head(list).build();

for(int i=0;i<data.size;i++)
{
WriteSheet writeSheet = EasyExcel.writerSheet(i, "sheet" + i).build();
excelWriter.write(data.get(i),writeSheet);
}
写出的execl打不开，大小为0;

调用 excelWriter.finish(); 了没有

最后调用excelWriter.flush();和outputStream.flush();看下