struts2各版本引用库

1、核对lib包
commons-fileupload-1.2.1.jar，
commons-io-1.3.2.jar
commons-logging-1.0.4.jar
freemarker-2.3.16.jar
ognl-3.0.jar
struts2-core-2.2.1.jar
xwork-core-2.2.1.jar）
注意2.1以前是没有commons-fileupload-1.2.1.jar，

2、如果struts2版本是2.1以前
web.xml配置过滤器的时候应该是这样：

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<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher  
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

如果struts2 版本是2.1以上

web.xml配置

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<filter>  
<filter-name>struts2</filter-name>  
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter  
</filter-class>  
</filter>  
<filter-mapping>  
<filter-name>struts2</filter-name>  
<url-pattern>/*</url-pattern>  
</filter-mapping>  
</web-app>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

3、在使用struts-2.2.1时，需要引入javassist-3.7.ga.jar，而这个在struts-2.2.1\lib下是没有的，需要在struts-2.2.1\apps\struts2-blank-2.2.1.war下的lib中找。