Spring MVC拦截器实现

到这段时，

想起来了以前学底层一些的servlet & jsp技术时，

过滤器和拦截器也有相关实现，

但比起来，spring的实现，可用性高很多。

其它代码不再放上来，

只放拦截器实现和xml配置吧。

AuthorizationInterceptor.java

package org.fkit.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.fkit.domain.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class AuthorizationInterceptor implements HandlerInterceptor {
	
	private static final String[] IGNORE_URI = {"/loginForm", "/login"};
	
	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object Handler, Exception exception) throws Exception {
		System.out.println("AuthorizationInterceptor afterCompletion-->");
		
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, 
			Object handler, ModelAndView mv)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("AuthorizationInterceptor postCompletion-->");
		
	}

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, 
			Object handler) throws Exception {
		// TODO Auto-generated method stub
		System.out.println("AuthorizationInterceptor preCompletion-->");
		boolean flag = false;
		String servletPath = request.getServletPath();
		for (String s : IGNORE_URI) {
			if (servletPath.contains(s)) {
				flag = true;
				break;
			}
		}
		
		if (!flag) {
			User user = (User) request.getSession().getAttribute("user");
			if (user == null ) {
				System.out.println("AuthorizationInterceptor拦截讲求：");
				request.setAttribute("message", "请先登陆再访问网站");
				request.getRequestDispatcher("loginForm").forward(request, response);
				
			} else {
				System.out.println("AuthorizationInterceptor 放行请求：");
				flag = true;
			}
		}
		return flag;
	}

}

<?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:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
		http://www.springframework.org/schema/mvc
		http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-4.2.xsd">
		
	<context:component-scan base-package="org.fkit.controller"/>
	<mvc:annotation-driven />
	<mvc:default-servlet-handler/>
	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/*"/>
			<bean class="org.fkit.interceptor.AuthorizationInterceptor" />
		</mvc:interceptor>
	</mvc:interceptors>
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix">
			<value>/WEB-INF/content/</value>
		</property>
		<property name="suffix">
			<value>.jsp</value>
		</property>
	</bean>
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="maxUploadSize">
			<value>10285760</value>
		</property>	
		<property name="defaultEncoding">
			<value>UTF-8</value>
		</property>
	</bean>



	
</beans>