Question

NSData* jsonDataToSendTheServer;

NSDictionary *setUser = [NSDictionary
            dictionaryWithObjectsAndKeys:[@"u" stringByAppendingString:my.id],@"id",
                                        @"GET_USER_INFO",@"command",
                                        @"",@"value",
                                        nil];

 NSLog(@"%@", jsonDataToSendTheServer);

这是我的代码。当我运行上面的代码时，我得到了这个打印

<7b226964 223a2275 35383738 37373334 31222c22 636f6d6d 616e6422 3a224745 545f5553 45525f49 4e464f22 2c227661 6c756522 3a22227d>

我不知道我是否可以创建一个json。

我该如何解决这个问题？

Answer 1

您缺少此行以将其转换为json

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

这是NSJSONSerialization的教程，可以帮助您： http://www.raywenderlich.com/5492/working-with-json-in-ios-5

之后，您可以将NSData转换为NSString进行打印：

Convert UTF-8 encoded NSData to NSString

Answer 2

您可以尝试以下创建JSON：

NSArray *objects=[[NSArray alloc]initWithObjects:objects here,nil];
NSArray *keys=[[NSArray alloc]initWithObjects:corresponding keys of objects,nil];
NSDictionary *dict=[NSDictionary dictionaryWithObjects:objects forKeys:keys];
NSData *jsonData=[NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];

这在我的案例中完美无缺

Answer 3

尝试以下

NSDictionary *o1 = [NSDictionary dictionaryWithObjectsAndKeys:
@"ABCD", @"key1",
@"EFG", @"key2",
nil];

NSDictionary *o2 = [NSDictionary dictionaryWithObjectsAndKeys:
@"XYZ", @"key1",
@"POI", @"key2",
nil];

NSArray *array = [NSArray arrayWithObjects:o1, o2, nil];

NSString *jsonString = [array JSONRepresentation];

//将jsonString发送到服务器执行上面的代码后，jsonString包含：

[
    {
        "key1": "ABCD",
        "key2": "EFG"
    },
    {
        "key1": "XYZ",
        "key2": "POI"
    }
]

Answer 4

试试这个

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Answer 5

NSDictionary *jsonObject = @{
                                 @"a":@[
                @{
                                             @"title1”:@“AA”,
                                             @"title2” : @“BB”,
                                             @"subcats" : @[
                                                     @{
                                                         @"title1” : @“CC”,
                                                         @"title2” :@“DD”
                                                         }

                                                     ]

                                             }
                                         ]



                                 };

Answer 6

NSMutableString * mutableString = nil; NSString * string = @＆＃34;＆＃34 ;;

@try
{
    if (mutableString == nil)
    {
        mutableString = [[NSMutableString alloc] init];
    }

    [mutableString appendFormat:@"{"];
    [mutableString appendFormat:@"\"string1\":%@"",",@""];
    [mutableString appendFormat:@"\"string2\":\"%@\"",@""];
    [mutableString appendFormat:@"}"];
    jsonString = mutableString ;
}
@catch (NSException *exception)
{

}
@finally
{
    return string;
}

如何在objective-c中创建json

6 个答案: