struts2拦截器默认拦截器默认跳转全局异常-白红宇

struts2 默认的action访问后缀是action 和无后缀

struts的配置文件的package中的内容的配置有顺序

The content of element type "package" must match "(result- types?, interceptors?, default-interceptor-ref?, default-action- ref?, default-class-ref?, global-results?, global-exception- mappings?, action*)"。

struts2拦截器只会拦截action层，不是action请求不会拦截，拦截action会在 web.xml 中的<error-page> <error-code>404</error-code> <location>/404.jsp</location> </error-page> 前拦截action，当此action不存在时，并不会再次执行web.xml中的<error-page>。

当拦截器拦截action后，可以加一个<default-action-ref name="not404"></default-action-ref>默认的跳转页面。注意，此配置的name指的是配置的action的name

，不是指的result。

不加namespace，是全局所有的action请求都可以用的

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

"http://struts.apache.org/dtds/struts-2.0.dtd">

<interceptor-stack name="loginStack">

<interceptor-ref name="defaultStack"/>

<interceptor-ref name="loginInterceptor" />

</interceptor-stack>

</interceptors>

<default-interceptor-ref name="loginStack" />

<default-action-ref name="not404"></default-action-ref>

<global-results>

<result name="error">/error.jsp</result>

<result name="loginError">/loginError.jsp</result>

</global-results>

<global-exception-mappings>

<exception-mapping exception="java.lang.NullPointerException" result="error" />

<exception-mapping exception="java.sql.SQLException" result="error" />

</global-exception-mappings>

</action>

</package>

</package>

<!-- <include file="com/oracle/jingdong/action/jd/struts-jd.xml" />

</struts>

java**************

package com.oracle.jingdong.filter;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import org.xml.sax.SAXException;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.interceptor.Interceptor;

import com.oracle.jingdong.entity.Buyer;

public class UserLoginFilter extends ActionSupport implements Interceptor{

private static final long serialVersionUID = 1L

public void init() {

System.out.println("chushihua");

}

public void destory() {

System.out.println("销毁");

}

public void destroy() {

// TODO Auto-generated method stub

}

public String intercept(ActionInvocation ai) throws Exception {

// TODO Auto-generated method stub

HttpServletRequest request=ServletActionContext.getRequest();

Buyer buyer=(Buyer)request.getSession().getAttribute("buyerName");

String requestName=ai.getInvocationContext().getName();

System.out.println(requestName);

if(buyer!=null)

return ai.invoke();

else if(requestName.equals("JdManAct_login"))

return ai.invoke();//ai.invoke()是String类型，值为sucess

else

return "loginError";

}