在iOS上发送HTTP POST请求 [英] Sending an HTTP POST request on iOS
问题描述
我正在尝试使用我正在开发的iOS应用程序发送HTTP Post但是推送从未到达服务器，尽管我确实获得了代码200作为响应（来自urlconnection）。我从来没有从服务器得到响应也没有服务器检测到我的帖子（服务器确实检测到来自android的帖子）
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)
我确实使用ARC但是设置了pd和urlConnection强大。
I do use ARC but have set pd and urlConnection as strong.
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];
这是我代表的代码
#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
控制台始终打印以下内容仅限行和以下行：
The console always prints the following lines and the following lines only:
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 <>
推荐答案
以下代码描述了一个使用<$ c的简单示例$ c> POST 方法。（如何通过 POST 方法传递数据）
The following code describes a simple example using POST method.(How one can pass data by POST method)
在这里，我将介绍如何使用POST方法。
Here, I describe how one can use of POST method.
1。使用实际用户名和密码设置帖子字符串。
1. Set post string with actual username and password.
NSString *post = [NSString stringWithFormat:@"Username=%@&Password=%@",@"username",@"password"];
2. 使用 NSASCIIStringEncoding对帖子字符串进行编码以及您需要以NSData格式发送的帖子字符串。
2. Encode the post string using NSASCIIStringEncoding and also the post string you need to send in NSData format.
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
您需要发送数据的实际长度。计算帖子字符串的长度。
You need to send the actual length of your data. Calculate the length of the post string.
NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];
3。使用<$ c $等所有属性创建Urlrequest c> HTTP 方法，http标头字段，其长度为post字符串。创建 URLRequest 对象并初始化它。
3. Create a Urlrequest with all the properties like HTTP method, http header field with length of the post string. Create URLRequest object and initialize it.
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
设置要将数据发送到该请求的网址。
Set the Url for which your going to send the data to that request.
[request setURL:[NSURL URLWithString:@"http://www.abcde.com/xyz/login.aspx"]];
现在，设置 HTTP 方法（ POST或GET ）。在你的代码中写下这一行。
Now, set HTTP method (POST or GET). Write this lines as it is in your code.
[request setHTTPMethod:@"POST"];
设置 HTTP 标题字段，长度为发布数据。
Set HTTP header field with length of the post data.
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
还设置HTTP标头字段的编码值。
Also set the Encoded value for HTTP header Field.
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
使用postData设置urlrequest的 HTTPBody 。
Set the HTTPBody of the urlrequest with postData.
[request setHTTPBody:postData];
4. 现在，创建URLConnection对象。使用URLRequest初始化它。
4. Now, create URLConnection object. Initialize it with the URLRequest.
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
它返回初始化的url连接并开始加载url请求的数据。您可以使用 if / else 语句检查您是否 URL 连接是否正确完成。
It returns the initialized url connection and begins to load the data for the url request. You can check that whether you URL connection is done properly or not using just if/else statement as below.
if(conn) {
NSLog(@"Connection Successful");
} else {
NSLog(@"Connection could not be made");
}
5. 从HTTP接收数据请求，您可以使用URLConnection类参考提供的委托方法。
代表方法如下。
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.
// 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
以下是源代码 HTTPPost方法。
这篇关于在iOS上发送HTTP POST请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
