struts拦截器

spring-security模块实现了权限控制功能.

自定义过滤器
1.自定义一个类实现Interceptor接口.
2.配置在调用的action中.并且加入默认的过滤器栈.只要你要使用默认的过滤器栈.

<interceptors>
			<interceptor name="auth" class="com.meiyoudao.filter.AuthFilter"></interceptor>
		</interceptors>
        <action name="welcome" class="com.meiyoudao.action.WelcomeAction">
        	<interceptor-ref name="auth"></interceptor-ref>
        	<interceptor-ref name="defaultStack"></interceptor-ref>
            <result>/welcome.jsp</result>
        </action>

/**
 * 
 */
package com.meiyoudao.filter;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

/**
 * @author meiyoudao
 *
 */
public class AuthFilter implements Interceptor {

	/* (non-Javadoc)
	 * @see com.opensymphony.xwork2.interceptor.Interceptor#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub

	}

	/* (non-Javadoc)
	 * @see com.opensymphony.xwork2.interceptor.Interceptor#init()
	 */
	public void init() {
		// TODO Auto-generated method stub

	}

	/* (non-Javadoc)
	 * @see com.opensymphony.xwork2.interceptor.Interceptor#intercept(com.opensymphony.xwork2.ActionInvocation)
	 */
	public String intercept(ActionInvocation invocation) throws Exception {
		System.out.println("do something filter begin...");
		String str = invocation.invoke();
		System.out.println("do something filter end...");
		return str;
	}

}