注意：仅需要如下这些jar包，否则启动时会出错
commons-lang3-3.2.jar
commons-logging-1.1.3.jar
commons-logging-api-1.1.jar
freemarker-2.3.19.jar
javassist-3.11.0.GA.jar
ognl-3.0.6.jar
struts2-core-2.3.20.jar
xwork-core-2.3.20.jar
commons-fileupload-1.3.1.jar
commons-io-2.2.jar
commons-lang-2.4.jar