如何通过 Post 方法使用 JSON 模型将 JSON 字典作为参数传递？

Question

我想使用 uploadUrl 将 JSON 字典作为参数传递，但它给了我一个 Unsupported Url 错误代码 1002。

当我在 Postman 上点击此 URL 时，它运行良好。如何使用 JSON 模型实现这一点？

NSString *uploadUrl =@"<Your host URL>";

[JSONHTTPClient postJSONFromURLWithString:uploadUrl params:nil
                               completion:^(NSDictionary *json, JSONModelError *err)
{
    if(err == nil)
    {
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"success" message:@"uploaded" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        completionHanldler(json);
    }
    else
    {
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Failed" message:@"uploaded" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];

        NSMutableDictionary *errorDict=[[NSMutableDictionary alloc]init];
        if(err.code==-1009)
            [errorDict setObject:@"The Internet connection appears to be offline."forKey:@"error"];
        else
            [errorDict setObject:@"Error occurred. Please try again!"forKey:@"error"];

        completionHanldler(errorDict);
    }
}];

Answer 1

stringByAddingPercentEscapesUsingEncoding

这个方法解决了这个问题。以前我分配了不受支持的 URL。

NSError * err;
NSData * jsonData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:&err];
NSString *myString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
// This line is the answer.
myString = [myString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

NSString *uploadUrl = [NSString stringWithFormat:@"<MY host URL>"?data=%@",myString];

[JSONHTTPClient postJSONFromURLWithString:uploadUrl params:nil
                               completion:^(NSDictionary *json, JSONModelError *err)
{
    if(err == nil)
    {
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"success" message:@"uploaded" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        completionHanldler(json);
    }
    else
    {
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Failed" message:@"uploaded" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];

        NSMutableDictionary *errorDict=[[NSMutableDictionary alloc]init];
        if(err.code==-1009)
            [errorDict setObject:@"The Internet connection appears to be offline."forKey:@"error"];
        else
            [errorDict setObject:@"Error occurred. Please try again!"forKey:@"error"];

        completionHanldler(errorDict);
    }
}];

Answer 2

查看您的问题和 API。您想向后端发送一些信息，您需要使用POST 方法发布信息，并且您的数据为json 格式。

您可以使用任何在线 API 代理（例如 POSTMAN 或 hurlit）测试请求。

我希望你清楚，你不能使用GET请求发送超过256个字节，因为你的API是POST请求。在您现有的方法中进行以下更改，您就完成了。

NSString *uploadUrl =@"<Your host URL>";
NSDictionary *dictParams = @{@"key" : @"value"};
[JSONHTTPClient postJSONFromURLWithString:uploadUrl params:dictParams
                               completion:^(NSDictionary *json, JSONModelError *err)
 {
 }];

Answer 3

试试这个：

NSString *uploadUrl =@"<Your host URL>";
NSDictionary *val = @{<Add your params as key : value here>};
NSArray *innerParameter = @[val];
NSDictionary *parameter =@{@"Passports":innerParameter};


[JSONHTTPClient postJSONFromURLWithString:uploadUrl params:parameter
                               completion:^(NSDictionary *json, JSONModelError *err)
{
    if(err == nil)
    {
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"success" message:@"uploaded" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        NSError *error;
        NSDictionary *resultDict = [NSJSONSerialization JSONObjectWithData:objectData  options:NSJSONReadingMutableContainers error:&jsonError]; // this is a dictionary NOT the JSON
        completionHanldler(resultDict);
    }
    else
    {
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Failed" message:@"uploaded" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];

        NSMutableDictionary *errorDict=[[NSMutableDictionary alloc]init];
        if(err.code==-1009)
            [errorDict setObject:@"The Internet connection appears to be offline."forKey:@"error"];
        else
            [errorDict setObject:@"Error occurred. Please try again!"forKey:@"error"];

        completionHanldler(errorDict);
    }
}];

编辑：

使用 AFNetworking 进行相同的网络调用

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *val = @{<Params as key : value>};
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager POST:@"<your host URL>" parameters:val success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"JSON: %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

编辑 2：

首先，我认为后端是在 POST 中完成的，但它正在通过 URL 编码。经过多次试验和错误，即使在 GET 中尝试过，也无法完成。据我了解，后端无法识别 JSON 格式的 POST 方法，因此您只能以 URL 编码方式发送它。