添加新的静态目录，原有static目录需要重新编译之后才能访问到新增的图片

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        // 前面的upload意思是，访问的时候路径上要加上upload，不然也访问不到。
        // 后面的upload意思是，你图片上传的路径，我的图片上传就在upload文件中(新创建的的文件夹)。
        registry.addResourceHandler("/upload/**").addResourceLocations("file:upload/");
    }

ImageUploadController

package com.example.demo.controller;

import com.example.demo.utils.Result;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.net.InetAddress;

@RestController
public class ImageUploadController {
    private static final String UPLOAD_DIR = System.getProperty("user.dir") + "\\upload\\images\\";

    @PostMapping("/upload")
    public Result uploadImage(@RequestParam MultipartFile file, @RequestParam String type, HttpServletRequest request) {
        if (file.isEmpty()) {
            return Result.error();
        }
        String fileName = file.getOriginalFilename();
        String suffixName = fileName.substring(fileName.lastIndexOf("."));
        // 解决中文问题，liunx下中文路径，图片显示问题
        // fileName = UUID.randomUUID() + suffixName;
        File dest = new File(UPLOAD_DIR + fileName);
        // 检测是否存在目录
        if (!dest.getParentFile().exists()) {
            dest.getParentFile().mkdirs();
        }
        try {
            file.transferTo(dest);
            // 获取当前服务的IP地址
            String serverIP = InetAddress.getLocalHost().getHostAddress();
            System.out.println(serverIP);
            // 获取当前服务的端口号
            String serverPort = request.getServerPort() + "";
            System.out.println(serverPort);
            return Result.ok("http://" + serverIP + ":" + serverPort + "/upload/images/" + fileName);
        } catch (IllegalStateException e) {
            e.printStackTrace();
            return Result.error();
        } catch (IOException e) {
            e.printStackTrace();
            return Result.error();
        }
    }
}