ios中json解析

安哥网络

以下是ios中三种不同解析方式：

jsonkit需要导入JSONKit.h、JSONKit.m文件，可在官网上下https://github.com/johnezang/JSONKit。
  1、JSONKit解析方式：

1. NSString *jsonString = @"[{"age":18,"book":{"price":23.2,"title":"booooooook1"},"name":"samyou"},{"age":22,"book":{"price":21,"title":"booooooook2"},"name":"samsam"}]";
   
2. 
   
3.     NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
   
4. //    NSDictionary *resultDic = [jsonData objectFromJSONData];
   
5.     NSArray *resultDic = [jsonData objectFromJSONData];
   
6.     NSString *nstr = [resultDic JSONString];//json字符串
   
7.     NSLog(@"str : %@",nstr);
   
8.     NSLog(@"age= %@", [resultDic valueForKey:@"age"]);
   
9.     NSLog(@"book= %@", [resultDic valueForKey:@"book"]);
   
10.     NSArray *books = [resultDic valueForKey:@"book"];
    
11.     NSLog(@"book.price===%@",[books valueForKey:@"price"]);

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2、SBJSON解析方式（通过plist文件进行读取）：
https://github.com/stig/json-framework可下载。

data.plist文件内容：[{"auctionId":1000,"auctionName":"苹果"},{"auctionId":1001,"auctionName":"李子"}]

1. //json解析
   
2.     NSString *filePath = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"];
   
3.     //获取字典
   
4.     NSDictionary *dataDict = [NSDictionary dictionaryWithContentsOfFile:filePath];
   
5.     //获取json key值
   
6.     NSString *jsonData = [dataDict objectForKey:@"auction"];
   
7.     if(jsonData == nil){
   
8.         NSLog(@"无数据！");
   
9.     }else{
   
10.         //得到jsoin数组
    
11.         NSArray *jsonArray = [jsonData JSONValue];
    
12.         NSLog(@"jsonArray:%@",jsonArray);
    
13.         //通过key获取对应的值
    
14.         //写法一
    
15.         NSString *auctionId = [jsonArray valueForKey:AUCTION_ID];
    
16.         NSLog(@"auctionId : %@",auctionId);
    
17.         //写法二
    
18. //        NSArray *auctionId = [jsonArray valueForKey:AUCTION_ID];
    
19. //        for(int i=0;i<[auctionId count];i++){
    
20. //            NSLog(@"auction : %@",[auctionId objectAtIndex:i]);
    
21. //        }
    
22.         //写法三(以下方法不行)
    
23. //        for(int i=0;i<[jsonArray count];i++){
    
24. //            Auction *auction = [jsonArray objectAtIndex:i];
    
25. //            NSLog(@"Auction.auctionName : %@",auction.auctionName);
    
26. //        }
    
27.   
    
28.     }
    
29.     [jsonData release];

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3、ios5自带API进行json解析，NSJSONSerialization类

1. NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
   
2.         [dictionary setValue:@"Anthony" forKey:@"name"];
   
3.         [dictionary setValue:[NSNumber numberWithUnsignedInteger:30] forKey:@"Age"];
   
4.         NSArray *arrayChildren = [[NSArray alloc] initWithObjects:@"A", @"B",  nil];
   
5.         [dictionary setValue:arrayChildren forKey:@"children"];
   
6.         NSError *error = nil;
   
7.         NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
   
8.         NSLog(@"jsonData : %@",[jsonData description]);
   
9.         if (error) {
   
10.             NSLog(@"dic->%@",error);
    
11.         }
    
12.         id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments error:&error];
    
13.         if (nil != jsonObject) {
    
14.             if ([jsonObject isKindOfClass:[NSDictionary class]]){
    
15.                 NSDictionary *resultDic = (NSDictionary *)jsonObject;
    
16.                 NSLog(@"Received JSON Dictionary : %@", resultDic);
    
17.             } else {
    
18.                 NSLog(@"Error JSON data.");
    
19.             }
    
20.         }

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本文摘自：http://wenxin2009.iteye.com/blog/1671691