springboot----拦截器

最新推荐文章于 2025-03-09 20:01:11 发布

Adela0916

最新推荐文章于 2025-03-09 20:01:11 发布

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分类专栏： springboot

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本文介绍了SpringBoot中拦截器的实现步骤，包括编写实现拦截器接口的类，将其注册到容器中，以及设置具体的拦截规则。特别提醒，若不指定则可能拦截所有请求，包括静态资源。

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拦截器步骤

编写一个拦截器实现HandlerInterceptor接口。

package com.fzl.web05admin.interceptor;

import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * 登陆检查
 * 1、配置好拦截器要拦截哪些请求
 * 2、把这些配置放在容器中
 */
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {

    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //登陆检查机制
        HttpSession session = request.getSession();
        log.info("拦截请求的路径是："+request.getRequestURI());
        Object loginUser = session.getAttribute("loginUser");
        if(loginUser != null){
            //放行
            return true;
        }
        //拦截住，未登录，跳转至登录页
        session.setAttribute("msg","请先登录！");
        response.sendRedirect("/");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("postHandler执行！");
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("afterHandler");
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

将拦截器注册到容器中（实现WebMvcConfiguration的addInterceptors）

@Configuration
public class AdminWebConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/**") //拦截所有请求，包括静态资源
                .excludePathPatterns("/","/login","/css/**","/fonts/**","/images/**","/js/**");
        WebMvcConfigurer.super.addInterceptors(registry);
    }
}