springboot文件上传测试Controller

package org.javaboy.file_upload;

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

@RestController
public class FileUploadController {

    SimpleDateFormat sdf = new SimpleDateFormat("/yyyy/MM/dd/");
    @PostMapping("/upload")
    public Map fileUpload(MultipartFile file, HttpServletRequest req){
        Map result = new HashMap<>(16);
        //原名称
        String originName = file.getOriginalFilename();
        //如果上传文件后缀不是以PDF结尾则返回result
        if (!originName.endsWith(".pdf")){
            result.put("status","error");
            result.put("msg","文件类型不对");
            return result;
        }
        String format = sdf.format(new Date());
        //存放路径如果没有则新建一个
        String realPath = req.getServletContext().getRealPath("/") + format;
        File folder = new File(realPath);
        if (!folder.exists()){
            folder.mkdirs();
        }
        String newName = UUID.randomUUID().toString() + ".pdf";
        try {
            //把内存图片写入磁盘
            file.transferTo(new File(folder,newName));
            String url = req.getScheme() + "://" + req.getServerName() + ":" + req.getServerPort() + format + newName;
            result.put("status","success");
            result.put("url",url);
        } catch (IOException e) {
            result.put("status","error");
            result.put("msg",e.getMessage());
        }
        return result;
    }
}