SpringBoot---------拦截器

目录

 拦截器概念

 拦截器实现的代码:

---

 拦截器概念

 图示拦截器

 拦截器实现的代码:

 自定义拦截器

package com.example.springboot_learn.Interceptor;

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

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

public class testiterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("这里是前置拦截器");
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("这里是中间拦截器");
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("这里是后置拦截器");
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

 拦截器MVC配置

package com.example.springboot_learn.Interceptor;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MVCCONFIG implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new testiterceptor())
                //“”里是添加要拦截的路径
                .addPathPatterns("/**")
                //“”里是设置不拦截的路径
                .excludePathPatterns("/Book1");

    }
}

结果

idea什么都不会输出，因为没有被拦截