1.创建一个拦截器，实现HandlerInterceptor接口

package com.example.springboot.common.interceptor;

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;

@Component
public class DuckTestInterceptor implements HandlerInterceptor {

    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {
        System.out.println(this.getClass().getName() + "<------>preHandle");
        return true;
    }

    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        System.out.println(this.getClass().getName() + "<------>postHandle");

    }

    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        System.out.println(this.getClass().getName() + "<------>afterCompletion");

    }

}

2.2：创建java类，继承WebMvcConfigurerAdapter，重写addInterceptors方法，把拦截器类添加到拦截器链中。

package com.example.springboot.common.config;

import com.example.springboot.common.interceptor.DuckTestInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
public class InterceptorRegister extends WebMvcConfigurerAdapter{

    @Autowired
    private DuckTestInterceptor duckTestInterceptor;

    /**
     * @Description 重写该方法可以通过服务器访问电脑本地文件
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry){
        //   file/** 服务器访问路径地址
        registry.addResourceHandler( "file/**")
                .addResourceLocations("file:" +"D:/project/"); //   D:/project/  本地文件存储地址
    }

    /*
     * 添加spring中的拦截器
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(duckTestInterceptor).addPathPatterns("/**");
    }

}

3.测试

A@QG{(%ZXMMQ5@J@B_(WU{P.png

测试访问本地文件1.png

测试访问本地文件2.png