NodeJS 强大的上传不起作用:'files'未定义,没有错误

0x6upsns  于 2023-06-05  发布在  Node.js
关注(0)|答案(6)|浏览(590)

我正在尝试使用强大的上传文件,下面的教程在Node Beginner Book。在这段代码之后,我有一个服务器模块,它将request对象传递给requestHandler模块。主页面加载具有以下处理程序的表单:

function start(response) {
    console.log("Request handler 'start' was called.");

    var body = '<html>'+
        '<head>'+
        '<meta http-equiv="Content-Type" content="text/html"; '+
        'charset=UTF-8" />'+
        '</head>'+
        '<body>'+
        '<form action="/upload" enctype="multipart/form-data method="post">'+
        '<input type="file" name="upload" multiple="multiple"'+
        '<input type="submit" value="Upload file" />'+
        '</form>'+
        '</body>'+
        '</html>';

    response.writeHead(200, {"Content-Type": "text/html"});
    response.write(body);
    response.end();

}

提交表单时,/upload路径触发以下上传处理程序函数:

function upload(response,request) {
    console.log("Request handler 'upload' was called.");

    var form = new formidable.IncomingForm();
    console.log("about to parse");
    form.parse(request, function(error, fields, files) {
        console.log("parsing done");

        console.log(util.inspect({error: error, fields: fields, files: files}));

        fs.rename(files.upload.path, "/tmp/test.png", function(error) {
            if (error) {
                console.log(error);
                fs.unlink("/tmp/test.png");
                fs.rename(files.upload.path, "/tmp/test.png");
            }
        });
        response.writeHead(200, {"Content-Type": "text/html"});
        response.write("received image:<br/>");
        response.write("<img src='/show' />");
        reponse.end();
    });

}

但是,当单击上载按钮时,服务器崩溃并出现以下错误:

/home/****/Coding/nodebeginner/requestHandlers.js:38
        fs.rename(files.upload.path, "/tmp/test.png", function(erro
                              ^
TypeError: Cannot read property 'path' of undefined
    at /home/****/Coding/nodebeginner/requestHandlers.js:38:25
    at IncomingForm.<anonymous> (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:104:9)
    at IncomingForm.EventEmitter.emit (events.js:92:17)
    at IncomingForm._maybeEnd (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:551:8)
    at Object.end (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:238:12)
    at IncomingMessage.<anonymous> (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:129:30)
    at IncomingMessage.EventEmitter.emit (events.js:92:17)
    at _stream_readable.js:920:16
    at process._tickCallback (node.js:415:13)

所以显然files变量是未定义的。我想可能有一个错误,但没有error变量被设置为null。所以我有点困惑。想法?

vaqhlq81

vaqhlq811#

我也有同样的问题。表单标记的enctype属性缺少一个右双引号(“)。

l0oc07j2

l0oc07j22#

我也有同样的问题。我想你可以在Node Beginner Book的最后看到这些代码。我通过删除server.js文件中的以下代码修复了它:

//      req.setEncoding("utf8");
//        req.addListener("data", function(postDataChunk) {
//            postData += postDataChunk;
//        });
//        req.addListener("end", function() {
//            route(handle, pathname, res, req);
//        });
Just do:

route(handle,path,res,req);

And last, you must be careful at html form tags.

Sorry for my English and best wishes!

***VinRover Nguyen***
daupos2t

daupos2t3#

我被同一个问题卡住了。听起来像上传类已被替换或拼写错误。尝试将引用从files.upload.path更改为files.upload.path。它在这里工作。查看master分支以获取更多信息:Git

o2g1uqev

o2g1uqev4#

看起来你的“var body”中有一些错误。尝试:

var body = '<html>' +
  '<head>' +
  '<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />' +
  '</head>' +
  '<body>' +
  '<form action="/upload" enctype="multipart/form-data" method="post">' +
  '<input type="file" name="upload" multiple="multiple">' +
  '<input type="submit" value="Upload File">' +
  '</form>' +
  '</bidy>' +
  '</html>';
s5a0g9ez

s5a0g9ez5#

form. parse中回调的参数名称有错误。
Node Beginner Book将代码显示为:

form.parse(request, function(error, fields, files) {
    //code
}

回调函数中的参数不应为复数:

form.parse(request, function(error, field, file) {
    //code
}

查看/node_modlues/offensive/lib/incoming_form. js中的IncomingForm.prototype.parse。回调正在侦听单数的“field”和“file”。

8ljdwjyq

8ljdwjyq6#

这是一个老问题,但如果有人在2023年仍然遇到这个问题,请在下面尝试。

const form = new formidable.IncomingForm();

form.parse(req, async (error, fields, files) => {
  if (error) {        
    console.error(`Error at form.parse: ${error}`);
    return res.status(500).send(`Error handling upload request.`);
  } 

  if (!files || !files.file) {
    console.error(`No file received.`);
    return res.status(400).send('No file received.');
  }

//Your code

}

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