import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.Around;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Pointcut;

@Aspect

public class demoInterceptor {

private demoInterceptor() {

};

@Pointcut("execution(* com.demo.controller.login(..))")

private void interceptor() {

};

@Around("interceptor()")

public Object aroundLogin(ProceedingJoinPoint point) throws Throwable {

HttpServletRequest request = null;

HttpServletResponse response = null;

Object[] args = point.getArgs();

for (int i = ; i < args.length; i++) {

if (args[i] instanceof HttpServletRequest) {

request = (HttpServletRequest) args[i];

}

if (args[i] instanceof HttpServletResponse) {

response = (HttpServletResponse) args[i];

}

}

if (request.getParameter("j_username").equals("demo")) {

return point.proceed();

} else {

response.sendRedirect("/login.do");

return null;

}

}

}

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

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:aop="http://www.springframework.org/schema/aop"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-3.0.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

<aop:aspectj-autoproxy/>

<bean class="demoInterceptor"/>

</beans>