easyexcel中poi

陈旧的项目导出excel时用的POI3.14，现在引入easyexcel2.2.6，报错。

Caused by: java.lang.NoClassDefFoundError: org/apache/poi/util/DefaultTempFileCreationStrategy
 at com.alibaba.excel.util.FileUtils.createPoiFilesDirectory(FileUtils.java:138)
 at com.alibaba.excel.write.ExcelBuilderImpl.(ExcelBuilderImpl.java:30)
 at com.alibaba.excel.ExcelWriter.(ExcelWriter.java:47)
 at com.alibaba.excel.write.builder.ExcelWriterBuilder.build(ExcelWriterBuilder.java:130)
 at com.alibaba.excel.write.builder.ExcelWriterBuilder.sheet(ExcelWriterBuilder.java:146)
 at com.alibaba.excel.write.builder.ExcelWriterBuilder.sheet(ExcelWriterBuilder.java:134)

easyexcel依赖POI3.17+，POI版本冲突。POI3.14之前用的地方很多，提升版本代价太大。

现使用maven-shade-plugin来保证POI多版本共存。原理是将POI3.17中的类换一个包名，从而和POI3.14中的类区分开。

1. 重新编译easyexcel源码包，使用maven-shade-plugin替换poi包名

2. 将打好的easyexcel.jar放入项目中，添加到本地依赖

   项目中也用到了asm3.3.1，easyexcel引用了asm4.2，也将asm包名替换

   
   
       
           
               org.apache.maven.plugins
               maven-shade-plugin
               3.2.4
               
                   
                       package
                       
                           shade
                       
                       
                           true
                           
                               
                                   
                                   org.apache.poi
                                   shade.org.apache.poi
                               
                               
                                   org.objectweb.asm
                                   shade.org.objectweb.asm
                               
                           
                       
                   
               
           
       
   
   
   
   
   
   
       com.alibaba
       easyexcel
       2.2.6
       ${basedir}/src/main/webapp/WEB-INF/lib/easyexcel-2.2.6.jar
       system