在 iOS 上发送 HTTP POST 请求
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Sending an HTTP POST request on iOS
提问by Daan Luttik
I'm trying to send an HTTP Post with the iOS application that I'm developing but the push never reaches the server although I do get a code 200 as response (from the urlconnection). I never get a response from the server nor does the server detect my posts (the server does detect posts coming from android)
我正在尝试使用我正在开发的 iOS 应用程序发送 HTTP Post，但推送从未到达服务器，尽管我确实收到了代码 200 作为响应（来自 urlconnection）。我从来没有得到服务器的响应，服务器也没有检测到我的帖子（服务器确实检测到来自 android 的帖子）
I do use ARC but have set pd and urlConnection as strong.
我确实使用 ARC，但已将 pd 和 urlConnection 设置为强。
This is my code for sending the request
这是我发送请求的代码
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];
this is my code for the delegate
这是我的委托代码
#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
The console always prints the following lines and the following lines only:
控制台总是打印以下几行并且仅打印以下几行：
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 <>
回答by iPatel
The following code describes a simple example using POSTmethod.(How one can pass data by POSTmethod)
下面的代码描述了一个使用POST方法的简单示例。（如何通过POST方法传递数据）
Here, I describe how one can use of POST method.
在这里，我描述了如何使用 POST 方法。
1.Set post string with actual username and password.
1.使用实际用户名和密码设置帖子字符串。
NSString *post = [NSString stringWithFormat:@"Username=%@&Password=%@",@"username",@"password"];
2.Encode the post string using NSASCIIStringEncodingand also the post string you need to send in NSData format.
2.使用 post 字符串NSASCIIStringEncoding以及您需要以 NSData 格式发送的 post 字符串进行编码。
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
You need to send the actual length of your data. Calculate the length of the post string.
您需要发送数据的实际长度。计算post字符串的长度。
NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];
3.Create a Urlrequest with all the properties like HTTPmethod, http header field with length of the post string. Create URLRequestobject and initialize it.
3.创建一个带有所有属性的 Urlrequest，如HTTP方法、带有 post 字符串长度的 http 标头字段。创建URLRequest对象并初始化它。
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
Set the Url for which your going to send the data to that request.
设置您要向该请求发送数据的 URL。
[request setURL:[NSURL URLWithString:@"http://www.abcde.com/xyz/login.aspx"]];
Now, set HTTPmethod (POST or GET). Write this lines as it is in your code.
现在，设置HTTP方法（POST 或 GET）。按照代码中的原样编写此行。
[request setHTTPMethod:@"POST"];
Set HTTPheader field with length of the post data.
HTTP使用 post 数据的长度设置头字段。
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
Also set the Encoded value for HTTP header Field.
还要设置 HTTP 标头字段的编码值。
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
Set the HTTPBodyof the urlrequest with postData.
HTTPBody使用 postData设置urlrequest 的 。
[request setHTTPBody:postData];
4.Now, create URLConnection object. Initialize it with the URLRequest.
4.现在，创建 URLConnection 对象。使用 URLRequest 对其进行初始化。
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
It returns the initialized url connection and begins to load the data for the url request. You can check that whether you URLconnection is done properly or not using just if/elsestatement as below.
它返回初始化的 url 连接并开始加载 url 请求的数据。您可以URL使用如下所示的if/else语句检查连接是否正确完成。
if(conn) {
NSLog(@"Connection Successful");
} else {
NSLog(@"Connection could not be made");
}
5.To receive the data from the HTTP request , you can use the delegate methods provided by the URLConnection Class Reference. Delegate methods are as below.
5、从HTTP请求中接收数据，可以使用URLConnection Class Reference提供的delegate方法。委托方法如下。
// 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
Also ReferThisandThisdocumentationfor POSTmethod.
And here is best example with source code of HTTPPost Method.
这是HTTPPost 方法源代码的最佳示例。
回答by Mannam Brahmam
-(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];
}
回答by nickygerritsen
I am not really sure why, but as soon as I comment out the following method it works:
我不太确定为什么，但是一旦我注释掉以下方法，它就会起作用：
connectionDidFinishDownloading:destinationURL:
Furthermore, I don't think you need the methods from the NSUrlConnectionDownloadDelegate protocol, only those from NSURLConnectionDataDelegate, unless you want some download information.
此外，我认为您不需要 NSUrlConnectionDownloadDelegate 协议中的方法，只需要 NSURLConnectionDataDelegate 中的方法，除非您需要一些下载信息。
回答by Esqarrouth
Heres the method I used in my logging library: https://github.com/goktugyil/QorumLogs
这是我在日志库中使用的方法：https: //github.com/goktugyil/QorumLogs
This method fills html forms inside Google Forms. Hope it helps someone using Swift.
此方法在 Google 表单中填充 html 表单。希望它可以帮助使用 Swift 的人。
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)
回答by Dilip Tiwari
Objective C
目标 C
Post API with parameters and validate with url to navigate if json
response key with status:"success"
发布带有参数的 API 并使用 url 进行验证以导航
状态是否为“成功”的json响应键
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 Response: {"status":"success","user_id":"58","user_name":"dilip","result":"You have been logged in successfully"} Working code
JSON 响应：{"status":"success","user_id":"58","user_name":"dilip","result":"您已成功登录"} 工作代码
**
**
回答by Ronny Morán
Sending an HTTP POST request on iOS (Objective c):
在 iOS 上发送 HTTP POST 请求（目标 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];
}
回答by Tech
Using Swift 3 or 4 you can access these http request for sever communication.
使用 Swift 3 或 4，您可以访问这些 http 请求以进行服务器通信。
// For POST data to request
// 用于POST数据请求
func postAction() {
//declare parameter as a dictionary which contains string as key and value combination. considering inputs are valid
let parameters = ["id": 13, "name": "Hyman"] 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() }
// For get the data from request
// 从请求中获取数据
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()
}
}
// For get the download content like image or video from request
// 用于从请求中获取图像或视频等下载内容
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()
}
