如何postjson数据到web服务器

Question

我是 XCode 的新人。我想将一些数据发送到只能接受和发送 json 数据的网络服务器。所以我尝试了下面的代码。

 NSMutableDictionary *newDatasetInfo = @{
                                  @"userName":@"abc",
                                  @"passWord":@"1234",
                                  @"apiKey":@"456789"
                                  }.mutableCopy;     
     NSError *myError = nil;
    NSData *post = [NSJSONSerialization dataWithJSONObject:newDatasetInfo options:NSJSONWritingPrettyPrinted  error:&myError];


NSURLSessionConfiguration *sessionConfig=[NSURLSessionConfiguration defaultSessionConfiguration];
sessionConfig.HTTPAdditionalHeaders=@{
                                      @"Accept":@"application/json"
                                      };
NSURLSession *session=[NSURLSession sessionWithConfiguration:sessionConfig];   
NSString *postdatalength=[NSString stringWithFormat:@"%lu",(unsigned long)[post length]];
NSMutableURLRequest *request=[[NSMutableURLRequest alloc] init];
[request setURL:([NSURL URLWithString:@"http://xx.xx.xx.xx/efg/ijk/login"])];
[request setHTTPMethod:@"POST"];
[request setValue:postdatalength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:post];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"requestReply: %@", requestReply);             

}];
[postDataTask resume];

但是在运行上面的代码之后我得到了下面的消息

POSTed JSON could not be parsed.

有谁知道这里的错误是什么？请帮忙。

Answer 1

替换下面几行

NSMutableDictionary *newDatasetInfo = @{
                              @"userName":@"abc",
                              @"passWord":@"1234",
                              @"apiKey":@"456789"
                              }.mutableCopy;     
 NSError *myError = nil;
NSData *post = [NSJSONSerialization dataWithJSONObject:newDatasetInfo options:NSJSONWritingPrettyPrinted  error:&myError];

和

NSDictionary *newDatasetInfo = @{
                                        @"userName":@"abc",
                                        @"passWord":@"1234",
                                        @"apiKey":@"456789"
                                        };

NSError *myError = nil;
NSData *post = [NSJSONSerialization dataWithJSONObject:newDatasetInfo options:0  error:&myError];

并确保您的所有参数（如用户名、密码等）都是真实的，检查两次。您应该先在 postman 或 advance rest client 中检查服务。这些是检查 Web 服务的不同工具。

希望这会有所帮助:)

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