我已经使用nodejs实现了服务器,并使用multer处理文件上传。
当我使用Postman上载文件时,文件已成功上载,并且控制台日志“上载图像api”也出现了。
但是,当我使用Swift从iOS上传文件时,尽管该文件也已成功上传,但控制台日志“上传图片api”和“表单解析完成”从未出现。这意味着未调用回调onParseEnd,我想这就是它冻结在那里并且不转到“上传图像api”部分的原因。
为什么在使用iOS上传文件时未调用onParseEnd?当我使用Postman时,一切都很好。
Nodejs和Multer:
router.post('/upload', multer({
dest: './public/uploads/user/',
onFileUploadStart: function (file,req,res) {
console.log(file.originalname + ' is starting ...')
return true;
},
onFileUploadComplete: function (file) {
console.log(file.fieldname + ' uploaded to ' + file.path)
},
onParseStart: function () {
console.log('Form parsing started at: ', new Date())
},
onParseEnd: function (req, next) {
console.log('Form parsing completed at: ', new Date());
// call the next middleware
next();
}
}), function(req,res,next){
console.log("upload image api");
});
iOS快速:
var session = NSURLSession.sharedSession()
let url = NSURL(string:url)
var request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = method
request.setValue("Keep-Alive", forHTTPHeaderField: "Connection")
request.setValue("Cache-Control", forHTTPHeaderField: "no-cache")
// set Content-Type in HTTP header
let boundaryConstant = "Boundary-\(NSUUID().UUIDString)";
let contentType = "multipart/form-data; boundary=\(boundaryConstant)"
request.setValue(contentType, forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
let filename = "image.jpg"
var body = NSMutableData()
body.appendString("--\(boundaryConstant)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(key)\"; filename=\"\(filename)\"\r\n")
body.appendString("Content-Type: \(dataType)\r\n\r\n")
body.appendData(data)
body.appendString("\r\n")
body.appendString("--\(boundaryConstant)\r\n")
request.HTTPBody = body
var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
println("Response: \(response)")
var strData = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Body: \(strData)")
var err: NSError?
var statusCode : Int = (response is NSHTTPURLResponse) ? (response as! NSHTTPURLResponse).statusCode : 404
var json : NSDictionary?
if(statusCode == 204){
json = NSDictionary()
}else{
json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSDictionary
}
// Did the JSONObjectWithData constructor return an error? If so, log the error to the console
if((err != nil)) {
println(err!.localizedDescription)
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Error could not parse JSON: '\(jsonStr)'")
completed(succeeded: false, data: nil, statusCode: statusCode)
}
else {
// The JSONObjectWithData constructor didn't return an error. But, we should still
// check and make sure that json has a value using optional binding.
if let parseJSON = json {
completed(succeeded: true, data: json, statusCode: statusCode)
return
}
else {
// Woa, okay the json object was nil, something went worng. Maybe the server isn't running?
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Error could not parse JSON: \(jsonStr)")
completed(succeeded: false, data: nil, statusCode: statusCode)
}
}
})
task.resume()
以下是在以上快速代码中使用的appendString函数。
func appendString(string: String) {
let data = string.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)
appendData(data!)
}
最佳答案
我已经使用Alamofire了,问题解决了。
https://github.com/Alamofire/Alamofire
Alamofire.upload(.POST, URLString: url, multipartFormData: { multipartFormData in
multipartFormData.appendBodyPart(data: data, name: key, fileName: "image.jpg", mimeType: "image/jpg")
}, encodingCompletion: { encodingResult in
switch encodingResult {
case .Success(let upload, _, _):
upload.responseJSON { request, response, data, error in
println("Response: \(response)")
var json = data as? NSDictionary
println("Body: \(json)")
var statusCode : Int = (response != nil) ? response!.statusCode : 404
completed(succeeded: true, data: json, statusCode: statusCode)
}
case .Failure(let encodingError):
completed(succeeded: false, data: nil, statusCode: 404)
}
})
如果有人知道前一种方法不起作用的原因,请发表评论。谢谢。
关于ios - 使用iOS上传文件时,为什么在nodejs multer上未调用onParseEnd回调?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/32054182/