SpringBoot整合SpringMvc拦截器

步骤：

1、编写拦截器（实现HandlerInterceptor）
2、编写配置类（实现WebMvcConfigurer）

编写拦截器

package com.example.demo.interceptor;

import lombok.extern.slf4j.XSlf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

//配置拦截器
public class MyInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("这是 preHandle");
        return true;
    }

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

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("这是 afterCompletion");

    }
}

编写配置类

package com.example.demo.config;

import com.example.demo.interceptor.MyInterceptor;
import org.springframework.context.annotation.Bean;
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 ItMvcConfig implements WebMvcConfigurer {

//    注册拦截器
    @Bean
    public MyInterceptor mvcConfig(){
        return new MyInterceptor();
    }

//    添加拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(mvcConfig()).addPathPatterns("/*");
    }
}