原因：没有commons-fileupload包导致，然后就在pom里加入了依赖。
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
如果还没有解决，去网上下载这个jar包，把它放在在lib的里面，就解决了这个问题。
文件上传出现：Failed to introspect Class [org.springframework.web.multipart.commons.CommonsMultipartResolver] from ClassLoader [ParallelWebappClassLoade
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