Question

我有这个json：

{“myFriends”：{“userId”：“用户ID”，“userName”：“用户名”，“朋友”：[{“u”：“朋友用户ID”，“n”：“朋友用户名“}，{”u“：”朋友用户ID“，”n“：”朋友用户名“}]}}

我希望将他的帖子请求发送给服务器，这是我尝试这样做的当前方式：

+(NSData *)postDataToUrl:(NSString*)urlString :(NSString*)jsonString
{
    NSData* responseData = nil;
    NSURL *url=[NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
    responseData = [NSMutableData data] ;
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
    NSString *bodydata=[NSString stringWithFormat:@"%@",jsonString];

    [request setHTTPMethod:@"POST"];
    NSData *req=[NSData dataWithBytes:[bodydata UTF8String] length:[bodydata length]];
    [request setHTTPBody:req];
    NSURLResponse* response;
    NSError* error = nil;
    responseData = [NSURLConnection sendSynchronousRequest:request     returningResponse:&response error:&error];
    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];

    NSLog(@"the final output is:%@",responseString);

    return responseData;
}

json字符串包含json，但由于某种原因，服务器总是得到nil并返回错误。如何解决这个问题？

Answer 1

告诉您的服务器有关内容类型肯定会有所帮助：

[request addValue:@"application/json"
   forHTTPHeaderField:@"Content-Type"];

此外：在我自己的代码中，我使用：

[request setHTTPBody:[bodydata dataUsingEncoding:NSUTF8StringEncoding]]

Answer 2

这是我的带有NSData参数的POST请求代码：

- (void)uploadJSONData:(NSData*)jsonData toPath:(NSString*)urlString {

    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:kRequestTimeout];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody: data];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%lu", (unsigned long)[data length]] forHTTPHeaderField:@"Content-Length"];

    // Create url connection and fire request
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
    [connection scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [connection start];
}

这是针对异步请求的，但它应该适用于同步。我唯一看到你可能遗失的是＆＃34; Content-Length＆＃34;参数。

从nsstring发送Post http请求

2 个答案: