如何在ios中使用NSURLConnection调用webService答案

【问题标题】：How to call webService Using NSURLConnection in ios如何在ios中使用NSURLConnection调用webService
【发布时间】：2016-06-17 12:07:11
【问题描述】：

实际上，我现在正在使用 JSON 类来调用 Web 服务，但现在我想使用 NSURLConnection 调用该 Web 服务，任何人都可以为我提供代码。

请提供我必须导入的框架的详细信息。

提前谢谢你。

【问题讨论】：

"NSURLConnection + JSON" 没有给你回复？ Google 上的第一个链接之一：stackoverflow.com/questions/20995815/…
您可以使用 AFNetworking 库进行 Web 服务调用。
你为什么使用NSURLConnection？它在 iOS 9.0 中已弃用。而是使用 NSURLSession 相同。您可以参考 Mattt Thompson 的 tutorial on NSURLSession。

标签： ios objective-c nsurlconnection sendasynchronousrequest

【解决方案1】：

NSURL *url = [NSURL URLWithString:stringurl];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];

[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
 {
     NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
     NSLog(@"%@",dictionary);
 }];

你可以用这个。

【讨论】：

但强烈建议不要使用新代码。首选[[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {...}];。

【解决方案2】：

你可以使用同步来做这样的事情：

NSURL *url=[NSURL URLWithString:urlString];
NSURLRequest *req=[NSURLRequest requestWithURL:url];
NSData *data=[NSURLConnection sendSynchronousRequest:req returningResponse:nil error:nil];
NSString *response=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSDictionary *dd=[response JSONValue];

或使用委托方法

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
NSURLResponse *response = nil;


 // Create url connection and fire request
       NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
      [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];


#pragma mark NSURLConnection Delegate Methods

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    // A response has been received, this is where we initialize the instance var you created
    // so that we can append data to it in the didReceiveData method
    // Furthermore, this method is called each time there is a redirect so reinitializing it
    // also serves to clear it

    _responseData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    // Append the new data to the instance variable you declared
    NSString* newStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];


    NSError* error;
    NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data
                                                         options:kNilOptions
                                                           error:&error];

   // NSArray* latestLoans = [json objectForKey:@"loans"];

    NSLog(@"json: %@", json);


    [_responseData appendData:data];
}

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
                  willCacheResponse:(NSCachedURLResponse*)cachedResponse {
    // Return nil to indicate not necessary to store a cached response for this connection
    return nil;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    // The request is complete and data has been received
    // You can parse the stuff in your instance variable now

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    // The request has failed for some reason!
    // Check the error var
}

【讨论】：

【解决方案3】：

使用以下代码调用 SOAP Web 服务 (POST)：

-(NSString *)posturl:(NSString *)url withpoststring:(NSString *)postString {

   NSString *post = postString;
   NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
   NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];
   NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
   NSString *URL = url;
   NSLog(@"%@", URL);
   NSLog(@"%@",post);

   [request  setURL:[NSURL URLWithString:URL]];
   [request setHTTPMethod:@"POST"];
   [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
   [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
   [request setHTTPBody:postData];

   NSError *error;
   NSURLResponse *response;
   NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
   NSString *data = [[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];

   if ([data isEqualToString:@""]) {

   } else {
      data = stringByStrippingHTML(data);
   }

   return data;
}

【讨论】：