struts2中错误处理

定义一个 package，然后其他package都继承 这个package

struts-global

就 有了这个错误处理功能了

然后再自己写个类

struts.xml

     <constant name="struts.devMode" value="true" />
     <constant name="struts.enable.DynamicMethodInvocation" value="false"></constant>
     <!-- <constant name="struts.custom.i18n.resources" value="itcast"></constant> -->
     <package name="struts-global" namespace="/" extends="struts-default">
         <global-results>
             <result name="errHandler" type="chain">
                 <param name="actionName">errorProcessor</param>
             </result>
         </global-results>
         <global-exception-mappings>
             <exception-mapping result="errHandler" exception="java.lang.Exception">
             </exception-mapping>
         </global-exception-mappings>

         <action name="errorProcessor" class="cn.itcast.sh.error.ErrorProcess">

             <result>error.jsp</result>
         </action>
     </package>

cn.itcast.sh.error.ErrorProcess类

 package cn.itcast.sh.error;

 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionSupport;

 public class ErrorProcess extends ActionSupport {
     private Exception exception;

     public Exception getException() {
         return exception;
     }

     public void setException(Exception exception) {
         this.exception = exception;
     }
     @Override
     public String execute()
     {
         ActionContext.getContext().getValueStack().push(this.exception.getMessage());
         return this.SUCCESS;
     }
 }

其他 strut.xml中

 <?xml version="1.0" encoding="utf-8"?>
    <!DOCTYPE struts PUBLIC
     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
     "http://struts.apache.org/dtds/struts-2.3.dtd">
 <struts>
     <package name="user" namespace="/" extends="struts-global">
         <action name="UserAction_*" method="{1}" class="cn.itcast.sh.action.UserAction">
             <result name="userList">/user/list.jsp</result>
         </action>

     </package>
 </struts>