source: src/main/java/it/finki/charitable/config/MvcConfig.java

package it.finki.charitable.config;

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

import java.nio.file.Path;
import java.nio.file.Paths;

@Configuration
public class MvcConfig implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        exposeDirectory("post-photos", registry);
        exposeDirectory("moderator-photos", registry);
    }

    private void exposeDirectory(String dirName, ResourceHandlerRegistry registry) {
        Path uploadDir = Paths.get(dirName);
        String uploadPath = uploadDir.toFile().getAbsolutePath();
        if(dirName.startsWith("../")) {
            dirName = dirName.replace("../", "");
        }
        registry.addResourceHandler("/" + dirName + "/**").addResourceLocations("file:/"+ uploadPath + "/");
    }
}