学步园

struts自定义拦截器可以继承AbstractInterceptor，或者实现Interceptor接口

实现接口要重写三个方法。

public class ValidLoginIntercept implements Interceptor{

	public void destroy() {
		
	}

	public void init() {
		
	}

	public String intercept(ActionInvocation arg0) throws Exception {
		return null;
	}
	
}

下面是这次的练习代码

package com.interceptor;

import java.util.Map;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

//自定义拦截器
public class ValidLoginIntercept extends AbstractInterceptor {

	@Override
	public String intercept(ActionInvocation arg0) throws Exception {
		
		Map session=arg0.getInvocationContext().getSession();
		String username=(String)session.get("sessionusername");
		if(username==null)
		{
			return Action.INPUT;
		}else
		{
			return arg0.invoke();
		}
	}

}

struts.xml的配置

<!-- 拦截器的使用 -->
		<interceptors>
		<!-- 定义拦截器 -->
			<interceptor name="validLoginIntercept" class="com.interceptor.ValidLoginIntercept" ></interceptor>
			<interceptor-stack name="invalLogin">
			<interceptor-ref name="defaultStack"></interceptor-ref>
			<interceptor-ref name="validLoginIntercept"></interceptor-ref>
			</interceptor-stack>
		</interceptors> 
		<action name="loginAction2" class="com.struts.LoginAction" method="login">
		<!-- 在action中调用拦截器 -->
			<interceptor-ref name="defaultStack"></interceptor-ref>
			<result name="success">/taglogin.jsp</result>
			<result name="failed">/taglogin.jsp</result>
			<result name="input">/taglogin.jsp</result>
		</action>