使用 busboy meanstack 上传图像 undefined

Question

我正在尝试制作具有图像上传功能的注册表单，因此我通过帖子和 enctype = "multipart/form-data" 获取 ejs 端的值

<form method="post" action= "/SignUp" enctype="multipart/form-data" >
    <div class="form-group">
        <label for="firstName">First name</label>
        <input type="text" name="firstName" id="firstName" class="form-control" value="<%= locals.firstName || '' %>" required />
    </div>
    <div class="form-group">
        <label for="lastName">Last name</label>
        <input type="text" name="lastName" id="lastName" class="form-control" value="<%= locals.lastName || '' %>" required />
    </div>
    <div class="form-group">
        <label for="username">Username</label>
        <input type="text" name="username" id="username" class="form-control" value="<%= locals.username || '' %>" required />
    </div>
    <div class="form-group">
        <label for="password">Password</label>
        <input type="password" name="password" id="password" class="form-control" required />
    </div>
    <div class = "from-group">
      <label for = "Image">Image</label>
      <input Content-Type = "multipart/form-data" type ="file" name = "Image" id = "Image" class = "form-control" required/>
    </div
    <br />
    <br />
    <div class="form-group">
        <button type="submit" class="btn btn-primary">Register</button>
        <a href="/login" class="btn btn-link">Cancel</a>
    </div>
</form>

我使用 busboy 从服务器端处理它

  SignUp:function(req,res){
  let reg = new Registrations();
  var busboy = new Busboy({
    headers: req.headers,
    limits: {
      fileSize: 6*1024*1024 //2MB limit
    }
  });
    var stream;
    var fstream;
       busboy.on('field', function(fieldname, val, fieldnameTruncated, valTruncated) {
         if(fieldname == 'firstName')
         reg.firstName = val;
         else if (fieldname == 'lastName')
          reg.lastName = val;
          else if(fieldname == 'username')
          reg.username = val;
          else {
            reg.password = val;
          }


       })
      busboy.on('file', function(fieldname,file, filename,encoding,mimeType){
      stream = __dirname + '/img/' + filename;
      fstream = fs.createWriteStream(__dirname + '/img/' + filename);
      file.pipe(fstream);
      fstream.on('close', function(){
          reg.Image = stream;
        reg.save(function(err,reg){
          if(err){
            res.send(err.message)
            console.log(err);
          }else{
            console.log(reg);
          }
        })
      })
    })
    busboy.on('finish', function() {

    })
    res.render('login');

  }

每次尝试时都会显示此错误
TypeError: Cannot read property 'on' of undefined on the line

req.busboy.on('file', function(fieldname,file, filename,encoding,mimeType)

你能告诉我这是什么问题吗？

Answer 1

在第一次查看busboy-doc 之后，在我看来，busboy 没有中间件，它正在扩展请求，请参见代码 sn-p：

var busboy = new Busboy({ headers: req.headers });
    busboy.on('file',...

Answer 2

我之前使用 busboy 上传图片，我将与您分享配置以及它是如何完成的。

1. 导入busboy模块

   var Busboy = require('busboy');

2. 然后在你的 post 端点内声明 busboy 对象

   var busboy = new Busboy({
     headers: req.headers,
     limits: {
       fileSize: 6*1024*1024 //2MB limit
     }
   });
   

3. 接下来是 post 端点

   中的其余代码

   busboy.on('field', function(fieldname, val, fieldnameTruncated, valTruncated) {
          //extract intput-field from upload-form
   });
   
   
   busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
         //process each file upload, check for size, mimetype, 
         //store if all checks passed, delete otherwise, move to 
         //next file
   });
   
   
   //finish call back when all files are uploaded
   busboy.on('finish', function() {
       //do cleanup and other related work 
   });
   
   return req.pipe(busboy);
   

我创建了一个项目要点，我使用 busboy 上传多张图片并进行以下检查

1. 从上传表单中提取输入字段
2. 确保文件大小不超过指定的 XMB
3. 确保 mimetypes 有效
4. 一旦找到超过 XMB (X.1MB) 的文件，则中止上传并移至下一个文件
5. 如果文件满足所有检查，则将其存储在本地

这里是公共要点的链接Upload Multiple Files with Busboy Nodejs ExpressJS

Answer 3

我改用了 multer，它工作正常

https://github.com/expressjs/multer