spring boot配置訪問本地資源文件（繼承WebMvcConfigurationSupport並實現addResourceHandlers）

0、參考https://blog.csdn.net/weixin_40404189/article/details/88825791

1、application.yml文件配置，在硬盤上創建一個文件夾

file:
  #rootPath: /home/resource
  rootPath: D:/resource/

2、新建一個類繼承WebMvcConfigurationSupport並實現addResourceHandlers

package com.dataagg.security;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.*;

import cn.dev33.satoken.interceptor.SaAnnotationInterceptor;

@Configuration
public class MySaTokenConfig extends WebMvcConfigurationSupport {
    @Value("${file.rootPath}")
    public String rootPath;

    // 注冊sa-token的攔截器，打開注解式鑒權功能
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new SaAnnotationInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/file/**");      // 放出 file
    }

    /**
     * 過濾訪問資源文件
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/file/**").addResourceLocations(
                "file:" + rootPath);
        super.addResourceHandlers(registry);
    }

}

3、瀏覽器訪問方式

（1）http://127.0.0.1:后台端口/接口名/file/11.png

如：http://127.0.0.1:8080/api/file/11.png