struts2 必备的几个jar包 ognl-3.0.jar javassist-3.7.ga.jar commons-logging-1.1.1.jar commons-fileupload-1.2.2.jar freemarker-2.3.16.jar struts2-core-2.2.1.1.jar struts2-json-plugin-2.2.1.1.jar xwork-core-2.2.1.1.jar