文件上传功能实现

package org.example.demo2.config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;
@CrossOrigin(origins ="*")
@RestController
@RequestMapping("/param")
@Validated
public class FileParamController{
    @PostMapping("/upload")
    public String uploadFile(@RequestParam("file") MultipartFile file) {
        String uploadFile = "C:\\upload\\images";
        // 1：指定文件上传的目录
        //获取当前年月
        // 获取当前年月
        LocalDate now = LocalDate.now();
        String yearMonth = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        uploadFile=uploadFile+"\\"+yearMonth;
        File targetFile = new File(uploadFile);
        try {
            // 2：如果targetFile不存在，则创建
            if (!targetFile.exists()) {
                targetFile.mkdirs();
            }
            // 3: 指定文件上传后的目录
            String fileName = file.getOriginalFilename();
            File targetFileName = new File(targetFile, fileName); // 先写死
            // 4：文件上传到指定的目录
            file.transferTo(targetFileName);
            Map map=new HashMap<>();
            map.put("filename",fileName);
            map.put("code",200);
            return "/FinforWorx/images/"+yearMonth+"/"+fileName;
        } catch (IOException e) {
            e.printStackTrace();
            Map map=new HashMap<>();
            map.put("des","上传错误");
            map.put("code",500);
            return "上传错误";
        }
    }
}