NSJSONSerialization

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NSJSONSerialization发布时间：2020-12-16 19:58:02  所属栏目：百科  来源：网络整理 
导读：- (IBAction)JOSNButtonPressed:(id)sender { 02 03 NSString *str=[@ "http://douban.fm/j/mine/playlist?type=nh=channel=0from=mainsiter=4941e23d79" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 04 05 NSURL *url = [NSURLURLWi

       - (IBAction)JOSNButtonPressed:(id)sender { 
     
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       NSString *str=[@"http://douban.fm/j/mine/playlist?type=n&h=&channel=0&from=mainsite&r=4941e23d79"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 
     
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      NSURL *url = [NSURLURLWithString :str]; 
      
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      // 构造 ASIHTTPRequest 对象 
      
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      ASIHTTPRequest *request = [ASIHTTPRequestrequestWithURL:url]; 
      
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      // 开始同步请求 
      
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      [request startSynchronous]; 
      
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      NSError *error = [request error]; 
      
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      assert(!error); 
      
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      // 如果请求成功，返回 Response // 对于2进制数据，使用：responseData 
      
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      NSData *data = [request responseData]; 
      
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      NSString *tmp=[[NSStringalloc] initWithData:data encoding:NSUTF8StringEncoding]; 
      
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      NSLog(@"%@",tmp); 
      
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      [tmp release]; 
      
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      // 返回一个JSON对象 
      
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      NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 
      
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      NSArray *songArray = [json objectForKey:@"song"]; 
      
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      "song:%@"38 
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      /* 
      
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      NSDictionary *aSony = [songArray objectAtIndex:0]; 
      
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      NSString *array = [aSony objectForKey:@"albumtitle"]; 
      
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      NSLog(@"albumtitle:%@",array); 
      
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      */ 
      
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      // 遍历输出JSON里song里的albumtitle 
      
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      for(NSDictionary *aSony in songArray) 
      
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      { 
      
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      NSString *array = [aSony objectForKey:@"albumtitle"56 
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      "albumtitle:%@"58 
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      } 
      
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      }

 
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01 
       // 自己构建一个JSON

- (IBAction)createaJSON:(id)sender {

NSDictionary *song = [NSDictionarydictionaryWithObjectsAndKeys:@"i can fly""title""4012""length""Tom""Singer"// isValidJSONObject判断对象是否可以构建成json对象

if([NSJSONSerializationisValidJSONObject:song])

{

NSError *error;

// 创造一个json从Data,NSJSONWritingPrettyPrinted指定的JSON数据产的空白，使输出更具可读性。

NSData *jsonData = [NSJSONSerializationdataWithJSONObject:song options:NSJSONWritingPrettyPrintederror:&error];

NSString *json =[[NSStringalloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

"json data:%@"}

}

 
     #define kGlobalQueue    dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0)
#define kDoubanUrl      @"http://douban.fm/j/mine/playlist?type=n&h=&channel=0&from=mainsite&r=4941e23d79"
-(void) loadJsonData:(NSURL *)url
{
    dispatch_async(kGlobalQueue,^{
        NSData *data = [NSData dataWithContentsOfURL:url];
        [self performSelectorOnMainThread:@selector(parseJsonData:) withObject:data waitUntilDone:NO];
    });
}
-(void) parseJsonData:(NSData *)data
{
    NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
    if (json == nil) {
        NSLog(@"json parse failed rn");
        return;
    }
    NSArray *songArray = [json objectForKey:song];
    NSLog(song collection: %@rn,songArray);

    _song = songArray;
    self.songIndex = 0;
    NSDictionary *song = [songArray objectAtIndex:song info: %@tn 
       
     

　　Foundation对象转换为json数据

View Code

NSDictionary *song = [NSDictionary dictionaryWithObjectsAndKeys:i can fly",title4012lengthTomSingerif ([NSJSONSerialization isValidJSONObject:song])
    {
        NSError *error;
        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:song options:NSJSONWritingPrettyPrinted error:&error];
        NSString *json =[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
        NSLog(json data:%@（编辑：李大同）
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