如何实现JSON解析获取响应到NSArray的代码？

Question

iPhone代码如何获得低于响应数组？这里我需要存储内容“Id值”，“LastUpdated值”和“标题”这三个值需要存储在3个不同的数组中如何可能？

这里是回应：

[ 
    { 
     "Contents": [ 
      { 
       "Id": 381, 
       "LastUpdated": "/Date(1338347251003+0000)/", 
       "Title": "Forrester Study - Total Economic Impact of Lync", 
       "Url": "http://infra2apps.blob.core.windows.net/eventapp/Forrester Study - Total Economic Impact of Lync_booth1.pdf" 
      } 
     ], 
     "Id": 1, 
     "ImageUrl": "http://infra2apps.blob.core.windows.net/eventapp/Lync.png", 
     "Name": "Unified Communications & Collaborations", 
     "Sessions": [ 
      { 
       "Description": "Microsoft Lync delivers Unified Communications to help people connect in new ways, anytime, anywhere. Learn how HP and Microsoft are helping customers transform their business infrastructure and gain greater productivity by making every communication an interaction that is more collaborative and engaging.", 
       "EndDate": "/Date(1338922800000+0000)/", 
       "FriendlyName": "TB3257", 
       "Id": 1, 
       "Location": "TBD", 
       "Speakers": [ 
        { 
         "Company": "Microsoft", 
         "Email": "ashimas@microsoft.com", 
         "Name": "Ashima Singhal", 
         "Title": "Group Marketing Manager, Lync" 
        }, 
        { 
         "Company": "HP", 
         "Email": "dragana.beara@hp.com", 
         "Name": "Dragana Beara", 
         "Title": "HP" 
        } 
       ], 
       "StartDate": "/Date(1338920100000+0000)/", 
       "Title": "Connecting People in New Ways with Microsoft Lync" 
      } 
     ] 
    }, 
    { 
     "Contents": [ 
      { 
       "Id": 385, 
       "LastUpdated": "/Date(1338347251143+0000)/", 
       "Title": "Windows 8 Consumer Preview - Product Guide - Business", 
       "Url": "http://infra2apps.blob.core.windows.net/eventapp/Windows 8 Consumer Preview - Product Guide - Business_booth2.pdf" 
      }, 
      { 
       "Id": 383, 
       "LastUpdated": "/Date(1338347251080+0000)/", 
       "Title": "Mitigating Risk - Why Sticking with Windows XP is a Bad Idea", 
       "Url": "http://infra2apps.blob.core.windows.net/eventapp/Mitigating Risk - Why Sticking with Windows XP is a Bad Idea - IDC - May 2012_booth2.pdf" 
      } 
     ], 
     "Id": 2, 
     "ImageUrl": "http://infra2apps.blob.core.windows.net/eventapp/Windows-brand.png", 
     "Name": "Windows the right choice for business", 
     "Sessions": [ 
      { 
       "Description": "Microsoft and HP are partnering together to migrate customers to Windows 7 while working closely together to build new Windows 8 products that will easily integrate into a Windows 7 environment. This session provides insight on how these new offerings will provide enterprise grade solutions with no compromise business devices that increase productivity, security, and manageability and the path to get there.", 
       "EndDate": "/Date(1338935400000+0000)/", 
       "FriendlyName": "TB3256", 
       "Id": 3, 
       "Location": "TBD", 
       "Speakers": [ 
        { 
         "Company": "Microsoft", 
         "Email": "snagy@microsoft.com", 
         "Name": "Sara Nagy", 
         "Title": "Senior Account Manager - OEM" 
        } 
       ], 
       "StartDate": "/Date(1338932700000+0000)/", 
       "Title": "Preparing for Windows 8" 
      } 
     ] 
    }, 
    { 
     "Contents": [ 
      { 
       "Id": 382, 
       "LastUpdated": "/Date(1338347251043+0000)/", 
       "Title": "HP EDW Appliance Solution Brief", 
       "Url": "http://infra2apps.blob.core.windows.net/eventapp/HP EDW Appliance Solution Brief_booth3.pdf" 
      }, 
      { 
       "Id": 380, 
       "LastUpdated": "/Date(1338347250970+0000)/", 
       "Title": "HP DBCA Datasheet", 
       "Url": "http://infra2apps.blob.core.windows.net/eventapp/11475_DBCA-Datasheet_booth3.pdf" 
      } 
     ], 
     "Id": 3, 
     "ImageUrl": "http://infra2apps.blob.core.windows.net/eventapp/SQL.png", 
     "Name": "Enterprise Information Platform", 
     "Sessions": [ 
      { 
       "Description": "The Database Consolidation appliance integrates software and harware into a turnkey solution that creates tremendous opportunities to virtualize demanding applications requiring enterprise-class resiliency. This session will dive into this NEW Private Cloud Appliance, leveraging virtualization and tuned and balanced infrastructure to deliver Private Cloud capabilities. We’ll go into detail including how to inventory and gather performance characteristics to provide detailed appliance-specific sizing and placement guidance using the MAP toolkit, how the appliance architecture enables high IO performance, isolation. and resiliency, and into details around core operational capabilities such as P-to-V and self-service workflow-enabled provisioning of new instances. Also, we will cover advanced capabilities such as chargeback, sustained engineering (upgrades and patching), load balancing with Live Demos that will show off the core capabilities of the appliance.", 
       "EndDate": "/Date(1339017300000+0000)/", 
       "FriendlyName": "TB3323", 
       "Id": 5, 
       "Location": "TBD", 
       "Speakers": [ 
        { 
         "Company": "Microsoft", 
         "Email": "markmort@microsoft.com", 
         "Name": "Mark Mortimore", 
         "Title": "Senior Program Manager, SQL Server Appliances" 
        } 
       ], 
       "StartDate": "/Date(1339014600000+0000)/", 
       "Title": "Cloud on your terms - Database Consolidation Appliance" 
      }, 
      { 
       "Description": "Leveraging virtual and scalable infrastructure - 100s of servers can be efficiently, reliably, and manageably consolidated. This session will dive into the NEW DBC Appliance, leveraging virtualization and tuned and balanced infrastructure. Using demos, we will show all phases of consolidation including how to assess environments using the MAP toolkit, details around core operational capabilities such as P-to-V and self-service workflow-enabled provisioning of new fully configured servers. Also, we will cover advanced capabilities such as chargeback, s load balancing… ", 
       "EndDate": "/Date(1339006800000+0000)/", 
       "FriendlyName": "DT3324", 
       "Id": 6, 
       "Location": "TBD", 
       "Speakers": [ 
        { 
         "Company": "Microsoft", 
         "Email": "markmort@microsoft.com", 
         "Name": "Mark Mortimore", 
         "Title": "Senior Program Manager, SQL Server Appliances" 
        } 
       ], 
       "StartDate": "/Date(1339005600000+0000)/", 
       "Title": "Database Consolidation & Private Cloud Appliance" 
      } 
     ] 
    }, 
    { 
     "Contents": [], 
     "Id": 4, 
     "ImageUrl": "http://infra2apps.blob.core.windows.net/eventapp/WinStorageSvr.png", 
     "Name": "Windows Storage Server", 
     "Sessions": [] 
    }, 
    { 
     "Contents": [], 
     "Id": 5, 
     "ImageUrl": "http://infra2apps.blob.core.windows.net/eventapp/SQL.png", 
     "Name": "Platform Modernization/Migration", 
     "Sessions": [ 
      { 
       "Description": "Microsoft and HP engineering have collaborated on delivering mission critical systems which outperform historic tier 1 platforms. Although many companies rely on the combination of HP and Microsoft for Mission Critical workloads, there has been a lingering doubt that the combined platform can scale to the needs of large enterprises currently relying on IBM Mainframes. This session will describe a signficant study just completed that puts to rest the myths that mainframes are the only platform that scales, can support high-IO and delivery mission critical capabilities. Finally an apples to apples comparison that you can use as you modernize your IT enviornment.", 
       "EndDate": "/Date(1339093200000+0000)/", 
       "FriendlyName": "DT3471", 
       "Id": 8, 
       "Location": "TBD", 
       "Speakers": [ 
        { 
         "Company": "Microsoft", 
         "Email": "scorosen@microsoft.com", 
         "Name": "Scott Rosenbloom", 
         "Title": "SSP Platform Modernization" 
        } 
       ], 
       "StartDate": "/Date(1339092000000+0000)/", 
       "Title": "Mainframe Alternative: Windows Server, SQL Server and HP DL 980" 
      } 
     ] 
    } 
] 

Answer 1

对不起，不解释下面的代码由于时间问题

-(void) dataRecieved: (NSDictionary *) receivedDict 
{ 
NSArray *contentsArray = [receivedDict objectForKey:@"Contents"]; 
NSArray *sessionsArray = [receivedDict objectForKey:@"Sessions"]; 

for (NSDictionary *contentsDict in contentsArray) 
    { 
     Contents *objContents = [[Contents alloc]init]; 
     objContents.id = [contentsDict objectForKey:@"ID"]; 
     objContents.lastUpdate = [contentsDict objectForKey:@"LastUpdate"]; 
     objContents.title = [contentsDict objectForKey:@"Title"]; 

     [contentObjectsArray addObject: objContents]; 
    } 

    for (NSDictionary *sessionsDict in sessionsArray) 
    { 
     Sessions *objSessions = [[Sessions alloc]init]; 
     objSessions.id = [contentsDict objectForKey:@"ID"]; 
     objSessions.endDate = [contentsDict objectForKey:@"EndDate"]; 

     NSArray *speakersArray = [receivedDict objectForKey:@"Speakers"]; 

     for (NSDictionary *spearkersDict in speakersArray) 
     { 
      Speakers *objSpeakers = [[Speakers alloc]init]; 
      objSpeakers.title = [spearkersDict objectForKey:@"Title"]; 
      [objSessions.speakerssObjectsArray addObject: objSpeakers]; 
     } 

     [sessionsObjectsArray addObject:objSessions]; 
    } 
} 

Answer 2

您的回答是没有有效的JSON。你不能用标准的JSON解析器解析它。 （您可以使用http://jsonlint.com/进行验证。）

//编辑： 所以编辑后，您确实有有效的JSON数据。要解析它，你可以使用任何你发现的JSON解析框架（一个流行的框架，例如json-framework）。

但是，如果您只为iOS5构建，则可以使用系统库NSJSONSerialization。

Answer 3

如果你的目标iOS 5或更高版本，JSON支持是本地的，所以你不需要添加任何外部库或实现解析器。你只需使用NSJSONSerialization。

See the documentation

示例代码：

NSError* error = nil; 

NSArray* parsed = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error]; 

if(!error) { 
    //Process here 
} 

如果你的目标IOS版本低于iOS 5的那么JSON解析本身并不支持，你必须自己实现解析器，或使用外部库适合您的需求。库 例子： SBJSON

Answer 4

使用SBJsonParser解析JSON，你可以使用这个link直观了解JSON，这样你就可以知道哪里会使用哪个数据结构，其余的就像@imsult所说的那样。