Question

我有一个简单的asp.net Web服务，它返回json格式的数据。我想发送带有参数的http post请求来获取json数据。 如何发送请求并获取数据？

发布请求

POST /JsonWS.asmx/FirmaGetir HTTP/1.1
Host: localhost
Content-Type: application/x-www-form-urlencoded
Content-Length: length

firID=string

答案：

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length    
<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">string</string>

我正在尝试一些代码，但它们无效。

NSString *firmadi =@"";
NSMutableData *response;


-(IBAction)buttonClick:(id)sender
{
    NSString *firid = [NSString stringWithFormat:@"800"];

    response = [[NSMutableData data] retain];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.23/testService/JsonWS.asmx?op=FirmaGetir"]];

    NSString *params = [[NSString alloc] initWithFormat:@"firID=%@",firid];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    if(theConnection)
    {
        response = [[NSMutableData data] retain];

    }
    else 
    {
        NSLog(@"theConnection is null");
    }

}

-(void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)responsed
{
    [response setLength:0];
     NSURLResponse * httpResponse;

    httpResponse = (NSURLResponse *) responsed;

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
{
    [response appendData:data];
    //NSLog(@"webdata: %@", data);

}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError*)error
{
    NSLog(@"error with the connection");
    [connection release];
    [response release];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    response = [[NSMutableData data] retain];

 NSString *responseString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
    NSLog(@"%@",responseString);

}

Answer 1

你在这做什么：

[[NSURLConnection alloc] initWithRequest:request delegate:self];

此行返回NSURLConnection，但您不存储它。这对你无能为力。

在阅读之前，您正在清除数据：

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    response = [[NSMutableData data] retain]; // This line is clearing your data get rid of it
    NSString *responseString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
    NSLog(@"%@",responseString);

}

修改

-(IBAction)buttonClick:(id)sender { NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.23/testService/JsonWS.asmx?op=FirmaGetir"] cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:15]; [request setHTTPMethod:@"POST"]; [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody:[@"firID=800" dataUsingEncoding:NSUTF8StringEncoding]]; self.connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; [self.connection start]; } #pragma NSURLConnection Delegates - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { if (!self.receivedData){ self.receivedData = [NSMutableData data]; } [self.receivedData appendData:data]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { NSString *responseString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding]; NSLog(@"%@",responseString); }

Answer 2

今天早上我遇到了这个问题，现在我就明白了。我想你问题的关键是如何使用参数的POST方法。实际上，这很简单。

（1）首先，您应该确保您的文件已准备好发送。这里我们说它是一个名为 stringReady 的NSString。我们在名为postRequest的方法中使用它作为参数（这里不是我们想要讨论的HTTP POST参数。不用担心）。

// Send JSON to server
- (void) postRequest:(NSString *)stringReady{
// Create a new NSMutableURLRequest
NSMutableURLRequest *req = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.xxxxxx.io/addcpd.php"]];
[req setHTTPMethod:@"POST"];

（2）现在，我们说服务器想要获取的参数被称为＆＃34; data＆＃34;，这就是如何将参数插入HTTP主体的方式。

// Add the [data] parameter
NSString *bodyWithPara = [NSString stringWithFormat:@"data=%@",stringReady];

请参阅使用POST方法添加参数的方法。您只需将参数放在要发送的文件之前即可。如果你知道你的参数是什么，那么你最好查看这个网站：

https://www.hurl.it/

这将帮助您测试您是否正确发送文件，它将在网站底部显示响应。

（3）第三，我们将NSString打包到NSData并将其发送到服务器。

// Convert the String to NSData
NSData *postData = [bodyWithPara dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
// Set the content length and http body
NSString *postLength = [NSString stringWithFormat:@"%lu",(unsigned long)[postData length]];
[req addValue:postLength forHTTPHeaderField:@"Content-Length"];
[req setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[req setHTTPBody:postData];
// Create an NSURLSession
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *task = [session dataTaskWithRequest:req
                                        completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                            // Do something with response data here - convert to JSON, check if error exists, etc....
                                            if (!data) {
                                                NSLog(@"No data returned from the sever, error occured: %@", error);
                                                return;
                                            }

                                            NSLog(@"got the NSData fine. here it is...\n%@\n", data);
                                            NSLog(@"next step, deserialising");

                                            NSError *deserr;
                                            NSDictionary *responseDict = [NSJSONSerialization
                                                                          JSONObjectWithData:data
                                                                          options:kNilOptions
                                                                          error:&deserr];
                                            NSLog(@"so, here's the responseDict\n\n\n%@\n\n\n", responseDict);
                                        }];

[task resume];}

希望这可以帮助那些陷入困境的人。

带参数的Http Post请求

2 个答案: