0

尝试将文件从 Angularjs UI 上传到 nodejs 服务器但遇到 bodyparser 问题，添加限制会抛出 -

"SyntaxError: Unexpected token - in JSON at position 0",

如果未添加限制，则抛出 -

“有效载荷太大”

我正在使用 connect-multiparty 中间件来上传文件。在 bodyparser 中尝试使用 {limit: '50mb'} 并且也没有任何限制。

用户界面代码 -

$('#imgupload').on('change', function  (evt) {
   let uploadedFiles = evt.target.files;
   let formData = new FormData();
    for (var i = 0; i < uploadedFiles.length; i++) {
        formData.append("uploads[]", uploadedFiles[i], 
        uploadedFiles[i].name);
    }
   let url =   "/upload";
   httpService.restApi(url,formData)
       .then(function (response) {
           console.log("the file has been uploaded to local server 
           ",response);
   });
});

Nodejs（服务器代码）-

const  multipart  =  require('connect-multiparty');  
const  multipartMiddleware  =  multipart({ uploadDir:  './uploads' });

app.use(bodyParser.json({limit: '50mb'}));

app.use(bodyParser.urlencoded({extended: true}));

app.post('/upload', multipartMiddleware, (req, res) => {  
    res.json({
        'message': 'File uploaded succesfully.'
    });
});
4

2 回答 2

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如果您使用 multer 并使用 $http 进行 API 调用，将“Content-Type”标头显式设置为 multipart/form-data，您将收到“Multer: Boundary not found error”，如果您删除“Content-Type”标头或将其设置为 false 它会抛出 - “将循环结构转换为 JSON 错误”。因此，我使用“fetch”来进行 API 调用，因为它自动识别了“Content-Type”。

UI代码（修改如下） -

$('#imgupload').unbind('change').on('change', function  (evt) {
    evt.stopPropagation();
    evt.preventDefault();
   let uploadedFiles = evt.target.files;


   let formData = new FormData();
   for(let i=0; i<uploadedFiles.length;i++){
    formData.append("uploads", uploadedFiles[i], uploadedFiles[i].name);
   }

   let url = '/upload';
   var req = {
    method: 'POST',
    body: formData
   }

   fetch(url,req).then(function(response) {
        console.log("the file has been uploaded to local server ",response);
        $scope.uploadToSftp();
   });

});

Nodejs 代码（修改如下） -

const multer = require('multer');
const storage = multer.diskStorage({
 destination: function (req, file, cb) {
   cb(null, './uploads/')
 },
 filename: function (req, file, cb) {
   cb(null, file.originalname)
 }
})
const multipartMiddleware  =  multer({ storage:  storage });

app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({  
  extended: true
}));

app.post('/upload', multipartMiddleware.array("uploads",2), function(req, res) 
{
  console.log("the upload api is called");
  return res.send(req.files);
});
于 2019-05-17T13:04:22.763 回答
0

bodyParser从路径中删除中间件：

const  multipart  =  require('connect-multiparty');  
const  multipartMiddleware  =  multipart({ uploadDir:  './uploads' });

̶a̶p̶p̶.̶u̶s̶e̶(̶b̶o̶d̶y̶P̶a̶r̶s̶e̶r̶.̶j̶s̶o̶n̶(̶{̶l̶i̶m̶i̶t̶:̶ ̶'̶5̶0̶m̶b̶'̶}̶)̶)̶;̶

̶a̶p̶p̶.̶u̶s̶e̶(̶b̶o̶d̶y̶P̶a̶r̶s̶e̶r̶.̶u̶r̶l̶e̶n̶c̶o̶d̶e̶d̶(̶{̶e̶x̶t̶e̶n̶d̶e̶d̶:̶ ̶t̶r̶u̶e̶}̶)̶)̶;̶

app.post('/upload', multipartMiddleware, (req, res) => {  
    res.json({
        'message': 'File uploaded succesfully.'
    });
});

内容是application/form-data，不是application/json或application/x-www-form-urlencoded。

于 2019-05-16T15:45:34.290 回答