Question

我正在尝试将csv文件上传到服务器。下面是我在html中的代码：

<form method="post" id="uploadCSV" enctype="multipart/form-data">
    File to upload: <input type="file" id="uploadfile" name="file" accept="text/csv">

 <input type="submit" value="Upload" id="uploadcsv" ng-click="uploadCSV()"> Press here to upload the file!
</form>

我的JS： -

 $scope.uploadCSV  = function() 

{

        var fileToLoad = document.getElementById("uploadfile").files[0];

        var csvreporturl = "/api/oel/csv";
        $http.post(csvreporturl, fileToLoad).then(function(response, status) {
           console.log("posted:",response);
        });

  }

最后Spring Boot中的控制器： -

@RequestMapping(value = "/api/oel/csv", method = RequestMethod.POST)

 String uploadFileHandler(@RequestBody MultipartFile fileToLoad) throws FileNotFoundException, IOException

{

        String name = fileToLoad.getName();
        if (!fileToLoad.isEmpty()) {
            try {
                byte[] bytes = fileToLoad.getBytes();

                // Creating the directory to store file
                //String rootPath = System.getProperty("catalina.home");
                File dir = new File("../dashboard-0.0.12/oel");
                if (!dir.exists())
                    dir.mkdirs();

                // Create the file on server
                File serverFile = new File(dir.getAbsolutePath()
                        + File.separator + name);
                BufferedOutputStream stream = new BufferedOutputStream(
                        new FileOutputStream(serverFile));

                stream.write(bytes);
                stream.close();



                return "You successfully uploaded file=" + name;
            } catch (Exception e) {
                return "You failed to upload " + name + " => " + e.getMessage();
            }
        } else {
            return "You failed to upload " + name
                    + " because the file was empty.";
        }
    }

我面临以下错误： -

无法加载资源：服务器响应状态为500   （HTTP / 1.1 500）

可能未经处理的拒绝：   { “数据”：{ “时间戳”：1510643953084， “状态”：500， “错误”：“内部   服务器   错误 “ ”异常“： ”显示java.lang.NullPointerException“， ”消息“：” 无   信息   可用的”， “路径”： “/ API / OEL / CSV”}， “状态”：500， “配置”：{ “方法”： “POST”， “transformRequest”：[空]， “transformResponse”：[空]， “jsonpCallbackParam”： “回调”， “URL”： “/ API / OEL / CSV”， “数据”：{}， “报头”：{ “接受”：“应用/ JSON，   text / plain的，    / “ ”内容类型“： ”应用/ JSON;字符集= UTF-8“}}， ”状态文本“：” HTTP / 1.1   500" }

有人可以帮忙吗？

由于

Answer 1

我建议这样做：Apache Commons FileUpload

if (ServletFileUpload.isMultipartContent(request)) {
    FileItemFactory factoryItem = new DiskFileItemFactory();
    ServletFileUpload uploadFile = new ServletFileUpload(factoryItem);

    try {
        List items = uploadFile.parseRequest(request);
        Iterator iterator = items.iterator();
        while (iterator.hasNext()) {
            FileItem item = (FileItem) iterator.next();

            if (!item.isFormField()) {
                String fileName = item.getName();

                String root = getServletContext().getRealPath("/");
                File path = new File(root + "/uploads");
                if (!path.exists()) {
                    boolean status = path.mkdirs();
                }

                File uploadedFile = new File(path + "/" + fileName);
                System.out.println(uploadedFile.getAbsolutePath());
                item.write(uploadedFile);
            }
        }
    } catch (FileUploadException ex) {
        ex.printStackTrace();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

尝试将CSV文件上传到服务器时出现空指针异常

1 个答案:

尝试将CS​​V文件上传到服务器时出现空指针异常

1 个答案:

尝试将CSV文件上传到服务器时出现空指针异常