springmvc的Interceptor拦截器和servlet的filter过滤器

springmvc的Interceptor拦截器和servlet的filter过滤器

1、springmvc的Interceptor拦截器和servlet的filter过滤器springboot实现方式

package com.liubaihui.lianxi01.controller;

import org.springframework.stereotype.Component;

import javax.servlet.*;
import java.io.IOException;

@Component
public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("过滤器dofilter被执行了");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("过滤器初始化方法执行了");
    }
}

package com.liubaihui.lianxi01.controller;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle被执行了");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle被执行了");
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion被执行了");
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

package com.liubaihui.lianxi01.controller;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Component
public class MyMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor())
                .addPathPatterns("/**");
    }
}

2、springmvc的Interceptor拦截器和servlet的filter过滤器区别

1、filter是servlet提供的、interceptor是springmvc提供的接口

2、filter是基于回调执行的，interceptor是动态代理方式实现的

3、filter可以做一下初始化方法init()处理

4、interceptor可以处理controller方法执行前中后执行做处理，filter只能做请求一次拦截请求

3、springmvc的Interceptor拦截器和servlet的filter过滤器和aop执行顺序

过滤器----拦截器---aop

参考：过滤器实现3种方式：https://blog.csdn.net/shaoming314/article/details/121366966