原本想通过easyexcel从2.2.6升级到3.3.3解决一部分问题，结果之前的可以用的代码，却无端的出现bug
1 Sheet index (1) is out of range (0…0)
什么都没有改，就出了问题，那么问题肯定出现在easyexcel版本自身.使用模板填充的方式进行多sheet填错，报错out of range #2731
从easyexcel一个模板动态多个sheet填充，easyexcel2,2,10就有这个问题。
异常如下
java.lang.IllegalArgumentException: Sheet index (1) is out of range (0..0)at org.apache.poi.hssf.usermodel.HSSFWorkbook.validateSheetIndex(HSSFWorkbook.java:569)at org.apache.poi.hssf.usermodel.HSSFWorkbook.getSheetAt(HSSFWorkbook.java:1003)at org.apache.poi.hssf.usermodel.HSSFWorkbook.getSheetAt(HSSFWorkbook.java:131)at com.alibaba.excel.context.WriteContextImpl.initSheet(WriteContextImpl.java:184)at com.alibaba.excel.context.WriteContextImpl.currentSheet(WriteContextImpl.java:135)at com.alibaba.excel.write.ExcelBuilderImpl.addContent(ExcelBuilderImpl.java:54)at com.alibaba.excel.ExcelWriter.write(ExcelWriter.java:73)at com.whty.acc.accountbook.service.impl.AccountBookExcelServiceImpl.exportExcelList(AccountBookExcelServiceImpl.java:146)
代码如下
public void exportExcelList(OutputStream outputStream, String pathName, List<ExcelSheetVO> list, boolean isShowCount, int lastCol) {Resource resource = new ClassPathResource(pathName);InputStream inputStream = null;String fileName = DateUtil.getDateRandom() + ".xls";File file = new File(TmpDic.url + File.separator + fileName);try {inputStream = resource.getInputStream();FileUtils.copyInputStreamToFile(inputStream, file);} catch (IOException e) {e.printStackTrace();}ExcelWriter excelWriter = EasyExcel.write(outputStream).withTemplate(file).build();FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();StyleCellHander styleCellHander = new StyleCellHander(false);for (ExcelSheetVO vo : list) {if (vo.getList() != null) {WriteSheet writeSheet = EasyExcel.writerSheet(vo.getSheetNo(), vo.getSheetName())//标题.registerWriteHandler(new SubsidiaryLedgerSheetWriteHander(vo.getExcelHeadVO(), isShowCount, lastCol))//单元格.registerWriteHandler(new SubsidiaryLedgerSheetStyleCellHander(isShowCount, false)).registerWriteHandler(new CustomCellWriteHandler()).build();excelWriter.fill(vo.getList(), fillConfig, writeSheet);} else {WriteSheet writeSheet = EasyExcel.writerSheet(vo.getSheetNo(), vo.getSheetName()).build();List<List> multipleList = vo.getMultipleList();int titleRownum = 0;int num = 0;for (int i = 0; i < multipleList.size(); i++) {List<LedgerDto> data = multipleList.get(i);if (i > 0) {titleRownum = num;}num = num + data.size() + 3;ExcelHeadVO headVo = new ExcelHeadVO();BeanUtils.copyProperties(vo.getExcelHeadVO(), headVo);if (i > 0) {headVo.setTitle(data.get(0).getSubFullName());headVo.setSubName(data.get(0).getSubCodeName());}WriteTable writeTable = EasyExcel.writerTable(i).head(vo.getClazz())//标题.registerWriteHandler(new TitleSheetWriteHandler(headVo, titleRownum, lastCol))//单元格.registerWriteHandler(styleCellHander).build();excelWriter.write(data, writeSheet, writeTable);}}}excelWriter.finish();file.delete();}
easyexcel一个模板动态多个sheet填充，从这篇文章中找到了解决方案。但结果并没有对方的好，奇怪。
第一个页签空白
第二页签，把上面的模板也导出来了，奇怪了，easyexcel没有结果测试吗？
xlsx格式文件比xls格式文件，体积小一半
一个Sheet多个table，设置表头不需要的话
显示效果如下，上面的模板还在，但是表头信息没有了
easyexcel centos 导出excel无数据 在windows上有 easyexcel导出复杂excel
首先猜想是不是跟sheet名称有关系,于是根据名称来匹配
得到的效果是,页签名称与页签中的内容是匹配的
如果使用,则得到的效果是乱的
WriteSheet writeSheet = EasyExcel.writerSheet(vo.getSheetNo()).needHead(Boolean.TRUE).build();
由于模板也多了一个页签，于是修正
for (int i = 0; i < list.size(); i++){ExcelSheetVO vo = list.get(i);if (i==0){workbook.setSheetName(0,vo.getSheetName());} else{workbook.cloneSheet(0,vo.getSheetName());}}
为什么下面的方式填写数据会为空呢？
WriteSheet writeSheet = EasyExcel.writerSheet(vo.getSheetName())//标题.registerWriteHandler(new SubsidiaryLedgerSheetWriteHander(vo.getExcelHeadVO(), isShowCount, lastCol))//单元格.registerWriteHandler(new SubsidiaryLedgerSheetStyleCellHander(isShowCount, false)).registerWriteHandler(new CustomCellWriteHandler()).build();excelWriter.fill(vo.getList(), fillConfig, writeSheet);
最终无奈退回到2.2.6，应该说2.2.6相对最好用了，现在系统报下面的错误
18:57:14.600 ERROR c.w.a.a.controller.AccSubsidiaryLedgerController - The maximum number of cell styles was exceeded. You can define up to 4000 styles in a .xls workbook
java.lang.IllegalStateException: The maximum number of cell styles was exceeded. You can define up to 4000 styles in a .xls workbookat org.apache.poi.hssf.usermodel.HSSFWorkbook.createCellStyle(HSSFWorkbook.java:1298)at org.apache.poi.hssf.usermodel.HSSFWorkbook.createCellStyle(HSSFWorkbook.java:131)at com.alibaba.excel.util.StyleUtil.buildDefaultCellStyle(StyleUtil.java:27)at com.alibaba.excel.util.StyleUtil.buildHeadCellStyle(StyleUtil.java:49)at com.alibaba.excel.write.style.AbstractVerticalCellStyleStrategy.setHeadCellStyle(AbstractVerticalCellStyleStrategy.java:47)at com.alibaba.excel.write.style.AbstractCellStyleStrategy.afterCellDispose(AbstractCellStyleStrategy.java:58)at com.alibaba.excel.util.WriteHandlerUtils.afterCellDispose(WriteHandlerUtils.java:176)
查看代码，原来是poi的限制，跟easyexcel没有直接的关系，因此升不升级没有影响。
单月明细账36个sheet，每个sheet又有20~50个明细科目。
如下面改成xlsx格式
ExcelWriter excelWriter = EasyExcel.write(outputStream).withTemplate(file).excelType(ExcelTypeEnum.XLSX).build();
提示新的错误
Caused by: org.apache.poi.openxml4j.exceptions.OLE2NotOfficeXmlFileException: The supplied data appears to be in the OLE2 Format. You are calling the part of POI that deals with OOXML (Office Open XML) Documents. You need to call a different part of POI to process this data (eg HSSF instead of XSSF)at org.apache.poi.openxml4j.opc.internal.ZipHelper.verifyZipHeader(ZipHelper.java:179)at org.apache.poi.openxml4j.opc.internal.ZipHelper.openZipStream(ZipHelper.java:209)at org.apache.poi.openxml4j.opc.ZipPackage.<init>(ZipPackage.java:98)at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:324)at org.apache.poi.util.PackageHelper.open(PackageHelper.java:37)at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:295)at com.alibaba.excel.util.WorkBookUtil.createWorkBook(WorkBookUtil.java:32)
这个错误说的我使用的是xls的模板，好吧，更正为xlsx的模板，结果提示,EasyExcel实战与笔记,也有人跟我遇到同样的问题。
java.lang.RuntimeException: NotImplementedat org.apache.poi.xssf.streaming.SXSSFSheet.shiftRows(SXSSFSheet.java:1000)at com.alibaba.excel.write.executor.ExcelWriteFillExecutor.shiftRows(ExcelWriteFillExecutor.java:158)at com.alibaba.excel.write.executor.ExcelWriteFillExecutor.fill(ExcelWriteFillExecutor.java:115)at com.alibaba.excel.write.ExcelBuilderImpl.fill(ExcelBuilderImpl.java:78)at com.alibaba.excel.ExcelWriter.fill(ExcelWriter.java:185)
更正模板后，又出现新的问题
java.lang.NullPointerException: nullat com.alibaba.excel.write.executor.ExcelWriteFillExecutor.doFill(ExcelWriteFillExecutor.java:191)at com.alibaba.excel.write.executor.ExcelWriteFillExecutor.fill(ExcelWriteFillExecutor.java:118)at com.alibaba.excel.write.ExcelBuilderImpl.fill(ExcelBuilderImpl.java:78)at com.alibaba.excel.ExcelWriter.fill(ExcelWriter.java:185)
还是改回xls格式，尝试解决单元格样式的问题。回头又发现一个问题，就是第一个页签，与页面内容不匹配的问题。EasyExcel修改模板sheet的名称(解决EasyExcel第一个sheet名称无法修改bug)，有人跟我一样的问题，按照他的方式解决即可。
接下来的问题在于怎么将CellStyle的创建数量降低,poi workbook 的
因为HSSFCellStyle不能直接被实例化，被保护了。
cellstyle 创建不能超过4000的解决方法，这个里面没有提供CacheManage的代码，或许也不需要这么干吧。无非是创建CellStyle,另外一种解决方案
private CellStyle getStyle(ExcelWriter excelWriter){CellStyle cellStyle = excelWriter.writeContext().writeWorkbookHolder().getWorkbook().createCellStyle();//背景为白色cellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());//右对齐cellStyle.setAlignment(HorizontalAlignment.RIGHT);// 下边框cellStyle.setBorderBottom(BorderStyle.THIN);// 左边框cellStyle.setBorderLeft(BorderStyle.THIN);// 上边框cellStyle.setBorderTop(BorderStyle.THIN);// 右边框cellStyle.setBorderRight(BorderStyle.THIN);return cellStyle;}
把样式定义在外层，然后传进去。明天搞个工具再仔细验证，至少目前上面出现的问题，没有出现
照着这个思路继续探究,再体外创建样式，通过构造函数写入进去，这个问题就解决了，需要将getStyle封装工具类里面，这样就可以循环使用了
