Mengirim permintaan HTTP POST di iOS

86

Saya mencoba mengirim HTTP Post dengan aplikasi iOS yang saya kembangkan tetapi push tidak pernah mencapai server meskipun saya mendapatkan kode 200 sebagai respons (dari urlconnection). Saya tidak pernah mendapatkan respon dari server dan tidak juga server mendeteksi posting saya (server mendeteksi posting yang berasal dari android)

Saya menggunakan ARC tetapi telah menetapkan pd dan urlConnection sebagai kuat.

Ini adalah kode saya untuk mengirimkan permintaan

 NSMutableURLRequest *request = [[NSMutableURLRequest alloc]
                                    initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@",dk.baseURL,@"daantest"]]];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"text/xml"
   forHTTPHeaderField:@"Content-type"];

    NSString *sendString = @"<data><item>Item 1</item><item>Item 2</item></data>";

    [request setValue:[NSString stringWithFormat:@"%d", [sendString length]] forHTTPHeaderField:@"Content-length"];

    [request setHTTPBody:[sendString dataUsingEncoding:NSUTF8StringEncoding]];
    PushDelegate *pushd = [[PushDelegate alloc] init];
    pd = pushd;
    urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:pd];
    [urlConnection start];

ini adalah kode saya untuk delegasi

#import "PushDelegate.h"

@implementation PushDelegate
@synthesize data;

-(id) init
{
    if(self = [super init])
    {
        data = [[NSMutableData alloc]init];
        [data setLength:0];
    }
    return self;
}


- (void)connection:(NSURLConnection *)connection didWriteData:(long long)bytesWritten totalBytesWritten:(long long)totalBytesWritten
{
    NSLog(@"didwriteData push");
}
- (void)connectionDidResumeDownloading:(NSURLConnection *)connection totalBytesWritten:(long long)totalBytesWritten expectedTotalBytes:(long long)expectedTotalBytes
{
    NSLog(@"connectionDidResumeDownloading push");
}

- (void)connectionDidFinishDownloading:(NSURLConnection *)connection destinationURL:(NSURL *)destinationURL
{
    NSLog(@"didfinish push @push %@",data);
}

- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
{
    NSLog(@"did send body");
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [self.data setLength:0];
    NSHTTPURLResponse *resp= (NSHTTPURLResponse *) response;
    NSLog(@"got response with status @push %d",[resp statusCode]);
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)d
{
    [self.data appendData:d];

    NSLog(@"recieved data @push %@", data);
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSString *responseText = [[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding];

    NSLog(@"didfinishLoading%@",responseText);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    [[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Error ", @"")
                                message:[error localizedDescription]
                               delegate:nil
                      cancelButtonTitle:NSLocalizedString(@"OK", @"")
                      otherButtonTitles:nil] show];
    NSLog(@"failed &push");
}

// Handle basic authentication challenge if needed
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    NSLog(@"credentials requested");
    NSString *username = @"username";
    NSString *password = @"password";

    NSURLCredential *credential = [NSURLCredential credentialWithUser:username
                                                             password:password
                                                          persistence:NSURLCredentialPersistenceForSession];
    [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
}

@end

Konsol selalu mencetak baris berikut dan baris berikut saja:

2013-04-01 20:35:04.341 ApprenticeXM[3423:907] did send body
2013-04-01 20:35:04.481 ApprenticeXM[3423:907] got response with status @push 200
2013-04-01 20:35:04.484 ApprenticeXM[3423:907] didfinish push @push <>
ios objective-c automatic-ref-counting http-post nsurlconnection Daan Luttik
sumber

Jawaban:

188

Kode berikut menjelaskan contoh sederhana menggunakan POSTmetode. ( Bagaimana seseorang dapat melewatkan data dengan POSTmetode )

Di sini, saya menjelaskan bagaimana seseorang dapat menggunakan metode POST.

1. Setel string postingan dengan nama pengguna dan kata sandi sebenarnya.

NSString *post = [NSString stringWithFormat:@"Username=%@&Password=%@",@"username",@"password"];

2. Encode string postingan menggunakan NSASCIIStringEncodingdan juga string postingan yang perlu Anda kirim dalam format NSData.

NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

Anda perlu mengirimkan panjang sebenarnya dari data Anda. Hitung panjang string posting.

NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];

3. Buat Urlrequest dengan semua properti seperti HTTPmetode, bidang header http dengan panjang string posting. Buat URLRequestobjek dan lakukan inisialisasi.

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

Atur Url yang akan Anda kirimi data ke permintaan itu.

[request setURL:[NSURL URLWithString:@"http://www.abcde.com/xyz/login.aspx"]];

Sekarang, setel metode HTTP ( POST atau GET ). Tulis baris ini seperti yang ada di kode Anda.

[request setHTTPMethod:@"POST"];

Atur HTTPkolom header dengan panjang data posting.

[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

Tetapkan juga nilai Encoded untuk HTTP header Field.

[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

Setel permintaan HTTPBodyurl dengan postData.

[request setHTTPBody:postData];

4. Sekarang, buat objek URLConnection. Inisialisasi dengan URLRequest.

NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];

Ini mengembalikan koneksi url yang diinisialisasi dan mulai memuat data untuk permintaan url. Anda dapat memeriksa apakah URLkoneksi Anda dilakukan dengan benar atau tidak menggunakan pernyataan hanya if / else seperti di bawah ini.

if(conn) {
    NSLog(@"Connection Successful");
} else {
    NSLog(@"Connection could not be made");
}

5. Untuk menerima data dari permintaan HTTP, Anda dapat menggunakan metode delegasi yang disediakan oleh Referensi Kelas URLConnection. Metode delegasi adalah seperti di bawah ini.

// This method is used to receive the data which we get using post method.
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data

// This method receives the error report in case of connection is not made to server. 
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 

// This method is used to process the data after connection has made successfully.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection

Juga Lihat Ini dan Dokumentasi ini untuk metode. POST

Dan inilah contoh terbaik dengan kode sumber Metode HTTPPost.

iPatel
sumber
1
Periksa juga apakah tidak ada cache yang sedang berlangsung. Itu akan menjelaskan mengapa Anda mendapat '200', tanpa terjadi apa-apa di server.
Jelle
Periksa jawaban yang diterima dari stackoverflow.com/questions/405151/… dan / atau google untuk "kebijakan cache nsurlconnection"
Jelle
1
Meskipun jawaban telah diterima berkali-kali, kode yang diberikan dalam jawaban ini memiliki sejumlah masalah yang mencolok, dan dalam praktiknya akan merepotkan.
CouchDeveloper
1
@iPatel Tapi bisakah kita mengirim data gambar menggunakan kode metode posting yang diberikan di atas.
iHulk
1
Sayangnya, kode ini salah dan rentan terhadap serangan injeksi. Jika pengguna kebetulan memiliki karakter "&" dalam sandi, semua karakter selanjutnya akan diuraikan sebagai parameter POST tambahan. Manipulasi yang disengaja dimungkinkan.
ge0rg
4 
-(void)sendingAnHTTPPOSTRequestOniOSWithUserEmailId: (NSString *)emailId withPassword: (NSString *)password{
//Init the NSURLSession with a configuration
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];

//Create an URLRequest
NSURL *url = [NSURL URLWithString:@"http://www.example.com/apis/login_api"];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];

//Create POST Params and add it to HTTPBody
NSString *params = [NSString stringWithFormat:@"email=%@&password=%@",emailId,password];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];

//Create task
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    //Handle your response here
    NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
     NSLog(@"%@",responseDict);
}];
   [dataTask resume];
}
Mannam Brahmam
sumber
2

Saya tidak begitu yakin mengapa, tetapi segera setelah saya mengomentari metode berikut ini berhasil:

connectionDidFinishDownloading:destinationURL:

Selain itu, saya rasa Anda tidak memerlukan metode dari protokol NSUrlConnectionDownloadDelegate, hanya yang dari NSURLConnectionDataDelegate, kecuali Anda menginginkan beberapa informasi unduhan.

nickygerritsen
sumber
Saya ingin informasi unduhan itu sebabnya saya memiliki fungsi connectionDidFinishDownloading: destinationURL:
Daan Luttik
1
Rupanya NSURLConnectionDownloadDelegate hanya berfungsi di aplikasi Kios .... Setidaknya itulah yang dikatakan utas ini: stackoverflow.com/questions/6735121/…
nickygerritsen
2

Inilah metode yang saya gunakan di perpustakaan logging saya: https://github.com/goktugyil/QorumLogs

Metode ini mengisi formulir html di dalam Google Formulir. Semoga bisa membantu seseorang yang menggunakan Swift.

var url = NSURL(string: urlstring)

var request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "POST"
request.setValue("application/x-www-form-urlencoded; charset=utf-8", forHTTPHeaderField: "Content-Type")
request.HTTPBody = postData.dataUsingEncoding(NSUTF8StringEncoding)
var connection = NSURLConnection(request: request, delegate: nil, startImmediately: true)
Esqarrouth
sumber
1

Mengirim permintaan HTTP POST di iOS (Tujuan c):

-(NSString *)postexample{

// SEND POST
NSString *url = [NSString stringWithFormat:@"URL"];
NSString *post = [NSString stringWithFormat:@"param=value"];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];


NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod:@"POST"];
[request setURL:[NSURL URLWithString:url]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];

NSError *error = nil;
NSHTTPURLResponse *responseCode = nil;

//RESPONDE DATA 
NSData *oResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&responseCode error:&error];

if([responseCode statusCode] != 200){
    NSLog(@"Error getting %@, HTTP status code %li", url, (long)[responseCode statusCode]);
    return nil;
}

//SEE RESPONSE DATA
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Response" message:[[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];

return [[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];
}
Ronny Morán
sumber
Ini baru ... Mendapatkan balasan 4 tahun setelah pertanyaan Anda diposting: p
Daan Luttik
Fungsi "postexample" ini lebih cepat dari Respon : p @DaanLuttik
Ronny Morán
1

Menggunakan Swift 3 atau 4 Anda dapat mengakses permintaan http ini untuk memutuskan komunikasi.

// Untuk meminta data POST

 func postAction()  {
//declare parameter as a dictionary which contains string as key and value combination. considering inputs are valid
let parameters = ["id": 13, "name": "jack"] as [String : Any]
//create the url with URL
let url = URL(string: "www.requestURL.php")! //change the url
//create the session object
let session = URLSession.shared
//now create the URLRequest object using the url object
var request = URLRequest(url: url)
request.httpMethod = "POST" //set http method as POST
do {
    request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) // pass dictionary to nsdata object and set it as request body
} catch let error {
    print(error.localizedDescription)
}
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
//create dataTask using the session object to send data to the server
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
    guard error == nil else {
        return
    }
    guard let data = data else {
        return
    }
    do {
        //create json object from data
        if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
            print(json)
            // handle json...
        }
    } catch let error {
        print(error.localizedDescription)
    }
})
task.resume() }

// Untuk mendapatkan data dari permintaan

func GetRequest()  {
    let urlString = URL(string: "http://www.requestURL.php") //change the url

    if let url = urlString {
        let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
            if error != nil {
                print(error ?? "")
            } else {
                if let responceData = data {
                    print(responceData) //JSONSerialization
                    do {
                        //create json object from data
                        if let json = try JSONSerialization.jsonObject(with:responceData, options: .mutableContainers) as? [String: Any] {
                            print(json)
                            // handle json...
                        }
                    } catch let error {
                        print(error.localizedDescription)
                    }
                }
            }
        }
        task.resume()
    }
}

// Untuk mendapatkan konten unduhan seperti gambar atau video dari permintaan

func downloadTask()  {
    // Create destination URL
    let documentsUrl:URL =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL!
    let destinationFileUrl = documentsUrl.appendingPathComponent("downloadedFile.jpg")
    //Create URL to the source file you want to download
    let fileURL = URL(string: "http://placehold.it/120x120&text=image1")
    let sessionConfig = URLSessionConfiguration.default
    let session = URLSession(configuration: sessionConfig)
    let request = URLRequest(url:fileURL!)

    let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
        if let tempLocalUrl = tempLocalUrl, error == nil {
            // Success
            if let statusCode = (response as? HTTPURLResponse)?.statusCode {
                print("Successfully downloaded. Status code: \(statusCode)")
            }

            do {
                try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
            } catch (let writeError) {
                print("Error creating a file \(destinationFileUrl) : \(writeError)")
            }

        } else {
            print("Error took place while downloading a file. Error description: %@", error?.localizedDescription ?? "");
        }
    }
    task.resume()

}
Tech
sumber
1

Tujuan C

Posting API dengan parameter dan validasi dengan url untuk menavigasi jika
kunci respons json dengan status: "berhasil"

NSString *string= [NSString stringWithFormat:@"url?uname=%@&pass=%@&uname_submit=Login",self.txtUsername.text,self.txtPassword.text];
    NSLog(@"%@",string);
    NSURL *url = [NSURL URLWithString:string];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    NSURLResponse *response;
    NSError *err;
    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
    NSLog(@"responseData: %@", responseData);
    NSString *str = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    NSLog(@"responseData: %@", str);
        NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData
                                                         options:kNilOptions
                                                           error:nil];
    NSDictionary* latestLoans = [json objectForKey:@"status"];
    NSString *str2=[NSString stringWithFormat:@"%@", latestLoans];
    NSString *str3=@"success";
    if ([str3 isEqualToString:str2 ])
    {
        [self performSegueWithIdentifier:@"move" sender:nil];
        NSLog(@"successfully.");
    }
    else
    {
        UIAlertController *alert= [UIAlertController
                                 alertControllerWithTitle:@"Try Again"
                                 message:@"Username or Password is Incorrect."
                                 preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction* ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
                                                   handler:^(UIAlertAction * action){
                                                       [self.view endEditing:YES];
                                                   }
                             ];
        [alert addAction:ok];
        [[UIView appearanceWhenContainedIn:[UIAlertController class], nil] setTintColor:[UIColor redColor]];
        [self presentViewController:alert animated:YES completion:nil];
        [self.view endEditing:YES];
      }

JSON Respon : {"status": "sukses", "user_id": "58", "user_name": "dilip", "result": "Anda telah berhasil login"} Kode yang berfungsi

**

Dilip Tiwari
sumber