我如何将json字符串发布到服务器 [英] How can i post json string to server

问题描述

这是我必须发布的json字符串...

This is json string that I have to post...

{
    "data": {
        "description": "",
        "current_value": "",
        "serialno": "",
        "condition": "",
        "category": "category",
        "purchase_value": "",
        "new_or_used": "",
        "gift_or_purchase": "",
        "image": ""
    },
    "subtype": "fd3102d8-bc19-424b-bca2-774a8fd7ea6f"
}

如何以JSON格式发布？

How to post as JSON?

推荐答案

当然这个Q我们重复一遍，但是这里有完整的示例代码，作为一个长期的例程。只需复制并粘贴。

Surely this Q us a duplicate, but here's full example code, as one long routine. Just copy and paste.

首先设置JSON ...

First set up the JSON...

-(void)sendTestJsonCommand
    {
    NSMutableDictionary *dict = @{
        @"heights":@"4_5_7",
        @"score":@"4",
        @"title":@"Some Title",
        @"textBody":@"Some Long Text",
        @"happy":@"y"
        }.mutableCopy;

    NSError *serr;

    NSData *jsonData = [NSJSONSerialization
        dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&serr];

    if (serr)
        {
        NSLog(@"Error generating json data for send dictionary...");
        NSLog(@"Error (%@), error: %@", dict, serr);
        return;
        }

    NSLog(@"Successfully generated JSON for send dictionary");
    NSLog(@"now sending this dictionary...\n%@\n\n\n", dict);

接下来，正确地异步发送命令和json到你的服务器......

Next, correctly asynchronously send the command and json to your server...

#define appService [NSURL \
  URLWithString:@"http://www.corp.com/apps/function/user/pass/id/etc"]

    // Create request object
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:appService];

    // Set method, body & content-type
    request.HTTPMethod = @"POST";
    request.HTTPBody = jsonData;
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];

    [request setValue:
        [NSString stringWithFormat:@"%lu",
        (unsigned long)[jsonData length]] forHTTPHeaderField:@"Content-Length"];

    // you would almost certainly use MBProgressHUD at this point
    // to display some sort of spinner or similar action on the UX

最后，（A）使用NSURLConnection正确连接，（B）正确解释从服务器返回给您的信息。

Finally, (A) connect correctly using NSURLConnection, and (B) correctly interpret the information which comes back to you from your server.

    [NSURLConnection sendAsynchronousRequest:request
        queue:[NSOperationQueue mainQueue]
        completionHandler:^(NSURLResponse *r, NSData *data, NSError *error)
        {

        if (!data)
            {
            NSLog(@"No data returned from server, error ocurred: %@", error);
            NSString *userErrorText = [NSString stringWithFormat:
               @"Error communicating with server: %@", error.localizedDescription]
            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);

        // LOOK at that output on your console to learn how to parse it.
        // to get individual values example blah = responseDict[@"fieldName"];
        }];

    }

希望能节省一些人打字！

Hope it saves someone some typing!

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