• 文件上传并返回查看地址


    由于项目中要用到文件上传,将文件上传到指定的目录中,并且生成网络地址,以供之后通过网络地址进行请求查看

    支持多文件上传

     SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd/");
    
         /**
          * 上传文件
          * @param uploadFiles
          * @param request
          * @return
          */
    
         @ApiOperation(value = "文件上传", notes = "文件上传")
         @DataSource(name = DataSourceNames.MASTER)
         @PostMapping("/uploads")
         public String upload(MultipartFile[] uploadFiles, HttpServletRequest request,
                              @RequestParam(name = "dataId", required = false) Integer dataId,
                              @RequestParam(name = "lx", required = false) String lx,
                              @RequestParam(name = "ly", required = false) String ly
         ) {
             List list = new ArrayList();//存储生成的访问路径
             if (uploadFiles.length > 0) {
                 for (int i = 0; i < uploadFiles.length; i++) {
                     MultipartFile uploadFile = uploadFiles[i];
                     //设置上传文件的位置在该项目目录下的uploadFile文件夹下,并根据上传的文件日期,进行分类保存
    //                 String realPath = request.getSession().getServletContext().getRealPath("uploadFile");
    //                realPath = "192.168.20.4:90";
                     String format = sdf.format(new Date());
                     File folder = new File("E:\\dist\\uploadFile" + format);   // 这里的dist就是前端部署时使用的dist文件夹   format是利用时间格式创建的文件夹
                     if (!folder.isDirectory()) {
                         folder.mkdirs();
                     }
    
                     String oldName = uploadFile.getOriginalFilename();
                     System.out.println("oldName = " + oldName);
                     String newName = UUID.randomUUID().toString() + oldName.
                             substring(oldName.lastIndexOf("."), oldName.length());
                     System.out.println("newName = " + newName);
                     try {
                         //保存文件
                         uploadFile.transferTo(new File(folder, newName));
                         //生成上传文件的访问路径
                         String filePath = request.getScheme() + "://" + request.getServerName() + ":"+ request.getServerPort() + "/uploadFile" + format + newName;
                         list.add(filePath);
                     } catch (IOException e) {
                         e.printStackTrace();
                     }
                 }
                 //根据条件查询,对应的类型,对应的字段是以及存在对应的文件
                 QueryWrapper<UploadFiles> queryWrapper = new QueryWrapper<>();
                 queryWrapper.lambda().eq(UploadFiles::getDataId,dataId)
                 .eq(UploadFiles::getLx,lx)
                 .eq(UploadFiles::getLy,ly)
                 .orderByDesc(UploadFiles::getCreateTime);
                 List<UploadFiles> list1 = uploadFilesService.list(queryWrapper);
                 UploadFiles uploadFile = new UploadFiles();
                 //如果存在,即更新对应的文件地址,不存在则根据传入值新增文件记录
                 if (list1.size() > 0)
                 {
                     uploadFile = list1.get(0);
                     uploadFile.setUrl(list.toString());
                 }else
                 {
                     uploadFile.setCreateTime(new Date());
                     uploadFile.setDataId(dataId);
                     uploadFile.setLx(lx);
                     uploadFile.setLy(ly);
                     uploadFile.setUrl(list.toString());
                 }
                 uploadFilesService.saveOrUpdate(uploadFile);
                 return list.toString();
             } else if (uploadFiles.length == 0) {
                 return "请选择文件";
             }
             return "上传失败";
         }

    参考文档:https://blog.csdn.net/Shu2018ai/article/details/97623776

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  • 原文地址:https://www.cnblogs.com/1gaoyu/p/16288684.html
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