1、在模块中加入配置，以访问静态资源

package com.itheima.reggie.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;


@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    /**
     * 设置静态资源映射
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
      registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");
      registry.addResourceHandler("/front/**").addResourceLocations("classpath:/front/");
    }
}