java.lang.NoClassDefFoundError: org/apache/commons/io/output/UnsynchronizedByteArrayOutputStream

导出EXECL表格的时候报：

java.lang.NoClassDefFoundError: org/apache/commons/io/output/UnsynchronizedByteArrayOutputStream

原因：版本在5.1.0的时候导出EXECL会出错，报加载不到当前类

<dependency>
   <groupId>org.apache.poigroupId>
   <artifactId>poiartifactId>
   <version>5.1.0version>
dependency>

<dependency>
   <groupId>org.apache.poigroupId>
   <artifactId>poi-ooxmlartifactId>
   <version>5.1.0version>
dependency>

解决办法一（降版本）：把poi的版本降低到5.0.0即可解决

<dependency>
   <groupId>org.apache.poigroupId>
   <artifactId>poiartifactId>
   <version>5.0.0version>
dependency>

<dependency>
   <groupId>org.apache.poigroupId>
   <artifactId>poi-ooxmlartifactId>
   <version>5.0.0version>
dependency>

解决办法二（升版本）：把commons-io和log4j-api的版本升级到下面版本

<dependency>
    <groupId>commons-iogroupId>
    <artifactId>commons-ioartifactId>
    <version>2.11.0version>
dependency>

<dependency>
    <groupId>org.apache.logging.log4jgroupId>
    <artifactId>log4j-apiartifactId>
    <version>2.17.1version>
dependency>