搭建struts框架必须的jar包：commons-fileupload-1.2.2.jar；commons-io-2.0.1.jar；commons-lang-2.5.jar；freemarker-2.3.16.jar；javassist-3.11.0.GA.jar；ognl-3.0.1.jar；servlet-api.jar；struts2-core-2.2.3.1.jar；xwork-core-2.2.3.1.jar