springboot上传资源到本地，数据库中存url

import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.UUID;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.InputStreamResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import dao.upAnddownDao;
import po.Sdownload;

@RestController
@RequestMapping("/test")
public class textController {

    @Autowired
    private upAnddownDao uad;

    // 上传
    @PostMapping("/upload")
    // 必须要有MultipartFile类型参数。而且参数名必须与表单file控件名一致
    public String upload(MultipartFile file) {
        // 上传图片存储目录
        String path = "d:/upload";
        // 获取文件名并使用UUID生成新文件名
        System.out.println(file);
        String fileName = file.getOriginalFilename();
        System.out.println(fileName);
        System.out.println(fileName.substring(fileName.lastIndexOf(".")));
        String newFileName = UUID.randomUUID() + fileName.substring(fileName.lastIndexOf("."));
        // 在指定上传图片存储目录中创建新文件
        File targetFile = new File(path, newFileName);
        // 如果找不到指定目录和文件，就新创建此目录和文件
        if (!targetFile.exists()) {
            targetFile.mkdirs();
        }
        // 将文件写入硬盘（myFile在内存中）
        try {
            file.transferTo(targetFile);
        } catch (Exception e) {
            e.printStackTrace();
        }

        Sdownload dl = new Sdownload();
        String url = path + "/" + newFileName;
        System.out.println(url);
        dl.setUrl(url);
        dl.setDeltag(0);
        Integer result = uad.upload(dl);
        System.out.println(result);

        return "ok";
    }

    // 下载
    @RequestMapping(value = "/down", method = RequestMethod.GET)
    public ResponseEntity<InputStreamResource> downfile(Integer dlid) throws IOException {
        System.out.println(dlid);
        Sdownload sdl = uad.download(dlid);
        String url = sdl.getUrl();

        // 明确要读取的文件
        File file = new File(url);
        FileSystemResource fsr = new FileSystemResource(file);

        // 设置响应输出流的头部信息
        HttpHeaders hh = new HttpHeaders();
        String fname = URLEncoder.encode(file.getName(), "utf-8");
        System.out.println(fname);
        hh.add("Content-Disposition", "attachment;filename=\"" + fname + "\"");
        hh.add("Cache-Control", "no-cache, no-store, must-revalidate");
        hh.add("Pragma", "no-cache");
        hh.add("Expires", "0");

        // 完成响应输出
        return ResponseEntity.ok().headers(hh).contentLength(fsr.contentLength())
                .contentType(MediaType.parseMediaType("application/octet-stream;charset=utf-8"))
                .body(new InputStreamResource(fsr.getInputStream()));

    }

}