Question

我正在使用nodejs和busboy接收json编码的文件。现在我想读取这个文件并在控制台上打印。

我想这应该很简单，但不知怎的，我不知道如何阅读和打印整个文件..

router.addRoute('/', function (req, res, params) {
    if (req.method === 'POST') {

        var busboy = new Busboy({ headers: req.headers });

        busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {
      console.log('File [' + fieldname + ']: filename: ' + filename + ', encoding: ' + encoding + ', mimetype: ' + mimetype);

            // We are streaming! Handle chunks
            file.on('data', function (data) {
        //read file
            });

            // Completed streaming the file.
            file.on('end', function () {
                console.log('Finished with ' + fieldname);
            });
        });

        // Listen for event when Busboy is finished parsing the form.
        busboy.on('finish', function () {
            res.statusCode = 200;
            res.end();
        });

        req.pipe(busboy);
    }
});

Answer 1

in＆＃34; file.on（＆＃39; data＆＃39;）＆＃34;回调你可以把文件的内容作为字符串。

    router.addRoute('/', function (req, res, params) {
    if (req.method === 'POST') {

        var busboy = new Busboy({ headers: req.headers });

        busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {
      console.log('File [' + fieldname + ']: filename: ' + filename + ', encoding: ' + encoding + ', mimetype: ' + mimetype);

            // We are streaming! Handle chunks
            file.on('data', function (data) {
            console.log(data);
            });

            // Completed streaming the file.
            file.on('end', function () {
                console.log('Finished with ' + fieldname);
            });
        });

        // Listen for event when Busboy is finished parsing the form.
        busboy.on('finish', function () {
            res.statusCode = 200;
            res.end();
        });

        req.pipe(busboy);
    }
});

如果它是不完整的流数据。 file.on（＆＃39; data＆＃39;）将每次触发部分文件内容，直到文件完成。如果你需要file.on（＆＃39; end＆＃39;）回调和a全局变量。见下文，

router.addRoute('/', function (req, res, params) {
    if (req.method === 'POST') {
        var wholeData = '';
        var busboy = new Busboy({ headers: req.headers });

        busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {
      console.log('File [' + fieldname + ']: filename: ' + filename + ', encoding: ' + encoding + ', mimetype: ' + mimetype);

            // We are streaming! Handle chunks
            file.on('data', function (data) {
            wholeData+=data;
            });

            // Completed streaming the file.
            file.on('end', function () {
                console.log('Finished with ' + fieldname);
                console.log(wholeData);
            });
        });

        // Listen for event when Busboy is finished parsing the form.
        busboy.on('finish', function () {
            res.statusCode = 200;
            res.end();
        });

        req.pipe(busboy);
    }
});

使用nodejs中的POST请求将文件打印到控制台

1 个答案: