SpringMVC-快速入门（6.4）- SpringMVC的拦截器（Interceptor）和过滤器（Filter）应用概述多个过滤器与拦截器的代码执行顺序

107 阅读 0 评论 71 点赞

我是靠谱客的博主文静戒指，最近开发中收集的这篇文章主要介绍SpringMVC-快速入门（6.4）- SpringMVC的拦截器（Interceptor）和过滤器（Filter）应用概述多个过滤器与拦截器的代码执行顺序，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

本章将近一步介绍SpringMVC的拦截器（Interceptor）和过滤器（Filter）的应用场景。因个人时间有限，先贴个引用文章
基于SpringMVC的拦截器（Interceptor）和过滤器（Filter）的区别与联系

过滤器（Filter）和拦截器（Interceptor）之间的最大区别就是，过滤器可以包装 Request 和 Response，而拦截器并不能。

多个过滤器与拦截器的代码执行顺序

1.1、定义两个过滤器

public class TestFilter1 extends OncePerRequestFilter {

	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {
		//在DispatcherServlet之前执行
		System.out.println("############TestFilter1 doFilterInternal executed############");
	    
		filterChain.doFilter(request, response);
		
		//在视图页面返回给客户端之前执行，但是执行顺序在Interceptor之后
		System.out.println("############TestFilter1 doFilter after############");
}

public class TestFilter2 extends OncePerRequestFilter {

	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {
		System.out.println("############TestFilter2 doFilterInternal executed############");
		filterChain.doFilter(request, response);
		System.out.println("############TestFilter2 doFilter after############");
	}
}

1.2、web.xml中注册这两个过滤器

<!-- 自定义过滤器：testFilter1 -->	
 	<filter>
		<filter-name>testFilter1</filter-name>
		<filter-class>cn.zifangsky.filter.TestFilter1</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>testFilter1</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- 自定义过滤器：testFilter2 -->	
 	<filter>
		<filter-name>testFilter2</filter-name>
		<filter-class>cn.zifangsky.filter.TestFilter2</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>testFilter2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

2.1、定义两个拦截器

public class BaseInterceptor implements HandlerInterceptor{
	
	/**
	 * 在DispatcherServlet之前执行
	 * */
	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
		System.out.println("************BaseInterceptor preHandle executed**********");
		return true;
	}

	/**
	 * 在controller执行之后的DispatcherServlet之后执行
	 * */
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		System.out.println("************BaseInterceptor postHandle executed**********");
	}
	
	/**
	 * 在页面渲染完成返回给客户端之前执行
	 * */
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		System.out.println("************BaseInterceptor afterCompletion executed**********");
	}
}

public class TestInterceptor implements HandlerInterceptor {

	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
		System.out.println("************TestInterceptor preHandle executed**********");
		return true;
	}

	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		System.out.println("************TestInterceptor postHandle executed**********");
	}

	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		System.out.println("************TestInterceptor afterCompletion executed**********");
	}
}

2.2、springmvc-servlet.xml中注册这两个拦截器

    <!-- 拦截器 -->
 	<mvc:interceptors>
		<!-- 对所有请求都拦截，公共拦截器可以有多个 -->
		<bean name="baseInterceptor" class="com.ymqx.interceptor.BaseInterceptor" />
		
		<mvc:interceptor>		
			<!-- 对/test.html进行拦截 -->
			<mvc:mapping path="/test.html"/>
			<!-- 特定请求的拦截器只能有一个 -->
			<bean class="com.ymqx.interceptor.TestInterceptor" />
		</mvc:interceptor>
	</mvc:interceptors>

3、新增一个测试使用的Controller

@Controller
@RequestMapping("/interceptor")
public class InterceptorController {
    @RequestMapping("/action1")
    public void action1(@RequestBody Product product){
        System.out.println("Product：" + product);
    }
}