如何在 iOS 7 中解析从 .NET Web 服务收到的 JSON 响应

Posted 2023-03-08

【中文标题】如何在 iOS 7 中解析从 .NET Web 服务收到的 JSON 响应

【英文标题】：How to Parse JSON Response in iOS 7 received from .NET Web Service

【发布时间】：2014-09-04 09:18:15

【问题描述】：

这是我在 REST CONSOLE 上测试我的 Web 服务时的 JSON 响应

"d": "\"token\":\"45b95300-e1ff-4bc1-b45c-9b87babc4df3\",\"timestamp\":\"09/04/2014 12:40:12 PM\""

这是我的日志详细信息：

Server Response :<NSHTTPURLResponse: 0x8ea8b70>  URL: http://dev-jrn.stits.co:777/Authonticate.aspx/authenticate   status code: 500, headers 
"Content-Length" = 91;
"Content-Type" = "application/json; charset=utf-8";
Date = "Thu, 04 Sep 2014 07:18:30 GMT";
Server = "Microsoft-IIS/7.5";
"X-Powered-By" = "ASP.NET";
jsonerror = true;
 

我的客户端代码

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
        NSString *post =[[NSString alloc] initWithFormat:@"username=%@&password=%@",[self.textUserName text],[self.textPassword text]];
        NSLog(@"PostData: %@",post);

        NSURL *url=[NSURL URLWithString:@"http://dev-jrn.stits.co:777/Authonticate.aspx/authenticate"];
        NSDictionary *jsonDict = [[NSDictionary alloc] initWithObjectsAndKeys:
                                  @"username", @"abc",
                                  @"password", @"abc",
                                  nil];

        NSError *error;
        NSData *postData = [NSJSONSerialization dataWithJSONObject:jsonDict options:0 error:&error];

        NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];

        NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
        [request setURL:url];
        [request setHTTPMethod:@"POST"];
        [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
        [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
        [request setValue:@"application/json; character=utf-8" forHTTPHeaderField:@"Content-Type"];
        [request setHTTPBody:postData];

        //[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[url host]];
        [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response,NSData *data, NSError *error)


       // NSLog(@"Response code: %ld", (long)[response statusCode]);
            if(error || !data)
               NSLog(@"Server Error : %@", error);
            
        else
        
            NSLog(@"Server Response :%@",response);
            NSError* error;
            NSDictionary* json = [NSJSONSerialization
                                  JSONObjectWithData:data
                                  options:kNilOptions
                                  error:&error];

            NSArray* latest = [json objectForKey:@"d"];
            NSLog(@"items: %@", latest);//Returning items: (null)
        
        
         ];

代码工作正常，但我知道我错过了一些东西。请帮助。 提前致谢

【参考方案1】：

[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:@"application/json; character=utf-8" forHTTPHeaderField:@"Content-Type"];

替换这个

[request setValue:@"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

【讨论】：

URL: dev-jrn.stits.co:777/Authonticate.aspx/authenticate 状态码: 200, headers "Cache-Control" = private; “内容长度”= 409； “内容类型”=“文本/html；字符集=utf-8”；日期 =“星期四，2014 年 9 月 4 日 09:59:31 GMT”；服务器 = "微软-IIS/7.5"; “X-AspNet-版本”=“4.0.30319”； "X-Powered-By" = "ASP.NET"; 2014-09-04 18:03:41.355 LoginDemoUsingWebService[22086:3a03] items: (null) 我在替换后仍然不需要你能建议如何解析这个响应 json 数组或我如何获取

在你的 NSLog(@"items: %@", latest) => items: (null) value.放置断点并检查你是否有任何空字符串值。你能检查一下。

我已经检查了你的代码。在用户名和密码中获取空值，那么你将如何得到响应。

是的，我得到的是空值。你能告诉我如何解决这个问题

检查那些链接链接edumobile.org/iphone/iphone-programming-tutorials/…。 ***.com/questions/15749486/…

【参考方案2】：

而不是这个

NSDictionary *jsonDict = [[NSDictionary alloc] initWithObjectsAndKeys:
                              @"username", @"abc",
                              @"password", @"abc",
                              nil];

试试

NSDictionary *jsonDict = [[NSDictionary alloc] initWithObjectsAndKeys:
                              @"abc", @"username",
                              @"dch", @"password",
                              nil];