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建议先去看文档 快速开始 、常见问题 触发场景描述 使用模板文件生成excel文件，使用流（InputStream）作为模板，则报错（错误见异常）
经过分析，可能的原因
文件流是xls作为模板的，源码中在初始化excelType的时候，对inputStream做为模板的情况做处理未处理，默认成了xlsx。请大佬确认下这个需要修复吗？
目前解决方法，自己拿到inputStream之后判断是xls还是xlsx，在设置excelType。
ExcelWriter excelWriter = EasyExcel.write(outputStream).withTemplate(templateFile).excelType(ExcelTypeEnum.XLSX).build();
触发Bug的代码
FileOutputStream outputStream = new FileOutputStream("test11.xls");
ClassPathResource classPathResource = new ClassPathResource("template/test.xls");
InputStream templateFile = classPathResource.getInputStream();
ExcelWriter excelWriter = EasyExcel.write(outputStream).withTemplate(templateFile).build();提示的异常或者没有达到的效果
com.alibaba.excel.exception.ExcelGenerateException: Create workbook failure
at com.alibaba.excel.context.WriteContextImpl.<init>(WriteContextImpl.java:87)
at com.alibaba.excel.write.ExcelBuilderImpl.<init>(ExcelBuilderImpl.java:35)
at com.alibaba.excel.ExcelWriter.<init>(ExcelWriter.java:47)
at com.alibaba.excel.write.builder.ExcelWriterBuilder.build(ExcelWriterBuilder.java:130)
at xxx.xxx.xxx.SettlementBillService.exportBill(SettlementBillService.java:219)
at xxx.xxx.xxx.SettlementBillService$$FastClassBySpringCGLIB$$d057b4a3.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
at xxx.xxx.xxx.SettlementBillService$$EnhancerBySpringCGLIB$$c54f3362.exportBill(<generated>)
at xxx.xxx.xxx.SettlementBillServiceTest.exportBill(SettlementBillServiceTest.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
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)
at com.alibaba.excel.context.WriteContextImpl.<init>(WriteContextImpl.java:85)
... 39 more