文件上传

• 1 、uniapp前端请求头不要添加,app自动添加,添加了获取不到
• 前端加上请求头后端获取文件为空
• 2、后端java代码实例

• @PostMapping("uploadFile")
      public JsonData upload(HttpServletRequest request, @RequestParam("file") MultipartFile files) throws IOException {
  
          //String path = "/api/upload/" + new SimpleDateFormat("yyyy/MM/dd/").format(new Date());
  
          System.out.println(path);
          //文件大小
          BigDecimal b = new BigDecimal((double) files.getSize() / 1048576);
          double f1 = b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
          System.out.println(f1 + "Mb");
  
          System.out.println("截取"+path.substring(path.indexOf("/"),path.length()));
  //        得到文件名
          UploadUtil uploadUtil = new UploadUtil();
          List<String> url = uploadUtil.uploadFile(request, path);
  
          return JsonData.buildSuccess(url,"上传成功");
  
      }

   

• 3、工具类

• public class UploadUtil {
  
      private final static Logger LOG = LoggerFactory.getLogger(UploadUtil.class);
  
      public final static String CDN_URL = "/data/cdnfiles/"; // 图片CDN加速地址
  
      public final static String IMG_URL = "http://i.shihuowang.com";/**
       *  @author: chenzhihao
       *  @description: files[1]="视频1“,files[2]="视频2",path 保存地址
       *  @date:  2021/4/6
       *  @param path 保存地址
       *  @return
       */
      public List<String> uploadFile(HttpServletRequest request, String path){
  
          log.info("request：  "+request.getSession().getServletContext().getRealPath("file"));
  
          CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
  
          commonsMultipartResolver.setDefaultEncoding("utf-8");
  //        File imgFile=null;
          String  url=null;
          List<String> pathRul=new ArrayList<>();
          File newFile=new File(path);
          if(!newFile.exists()){
              newFile.mkdirs();
          }
          if (commonsMultipartResolver.isMultipart(request)){
              MultipartHttpServletRequest mulReq = (MultipartHttpServletRequest) request;
              Map<String, MultipartFile> map = mulReq.getFileMap();
              // key为前端的name属性，value为上传的对象（MultipartFile）
              for (Map.Entry<String, MultipartFile> entry : map.entrySet()) {
                  // 自己的保存文件逻辑
                  log.info("名称：" +entry.getValue().getOriginalFilename());
  //                imgFile = new File(path + "/" + entry.getValue().getOriginalFilename());
                  url=path+entry.getValue().getOriginalFilename();
                  log.info("图片存储的路径：" + url);
                  try {
                      File file1=new File(System.getProperty("user.dir"));
                      String uploadFile = uploadFile(entry.getValue(), file1.getAbsolutePath() + path);
                      pathRul.add(path+uploadFile);
                  }catch (Exception e){
                      pathRul.add(e.getMessage());
                      return pathRul;
                  }
              }
              return pathRul;
          }else {
              return pathRul;
          }
      }
      public String uploadFile(@RequestParam("file") MultipartFile multipartFile, String path) {
          String filename=multipartFile.getOriginalFilename();
          String[] strings = filename.split("\\.");
          String name = System.currentTimeMillis()+"."+strings[strings.length-1];
          try {
              File file=new File(path,name);
              if(!file.exists()){
                  file.mkdirs();
              }
              multipartFile.transferTo(file);
              return name;
          }catch (Exception e){
              return e.getMessage();
          }
      }
  }

   

• 4、测试用postman
• 在body的form-data格式进行