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>