Spring中过滤器(Filter)和拦截器(Interceptor)的区别和联系解析

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

public class Myfilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("Myfilter init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("Myfilter doFilter before");
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("Myfilter doFilter after");
    }

    @Override
    public void destroy() {
        System.out.println("Myfilter destroy");
    }
}

<!-- 注册过滤器 -->
    <filter>
        <filter-name>myfilter</filter-name>
        <filter-class>com.hardy.config.Myfilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>myfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

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 {
        // 在拦截点（Controller方法处理之前）执行拦截 若返回的是false则中断执行 反之亦然
        System.out.println("MyInterceptor preHandle");
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        // 在处理过程中（Controller方法处理完之后  DispatcherServlet进行视图的渲染之前）执行拦截
        System.out.println("MyInterceptor postHandle");
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 在DispatcherServlet进行视图的渲染后 返回前进行拦截
        System.out.println("MyInterceptor afterCompletion");
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

    <!-- 配置拦截器 -->
    <mvc:interceptors>
        <mvc:interceptor>
            <!-- 拦截所有的mvc控制器(Controller) -->
            <mvc:mapping path="/**"/>
            <!-- 放行机制 指定对某个页面不进行拦截 -->
            <!-- 拦截器只对action起作用 因此填入的不是页面路径 而是方法 -->
            <mvc:exclude-mapping path="/login"/>
            <!-- 指定使用哪个拦截器 -->
            <bean class="com.hardy.config.MyInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>