这个问题是缺少jar包
除了ognl-2.6.11.jar,struts2-core-2.1.6.jar,xwork-2.1.2.jar,commons-logging-1.0.4.jar外,
还需要添加freemarker-2.3.13.jar,commons-fileupload-1.2.1.jar,commons-io-1.3.2.jar
转自 http://blog.csdn.net/winer2008/article/details/3882018
