我想解析json数组，如下所示。我需要获得id，category等。
"items":[{
"id": "s_A7tiCV_XQ",
"uploaded": "2014-08-30T17:52:42.000Z",
"updated": "2014-10-17T10:06:04.000Z",
"uploader": "laharimusic",
"category": "Music",
"title": "Aagadu Audio Jukebox || Super Star Mahesh Babu, Tamannaah [HD]",
"description": "Aagadu Audio Jukebox Subscribe to our Youtube Channel: http://bit.ly/1hE4KpS iTunes : http://goo.gl/SqNCep Buy Your Copy on Flipkart : http://goo.gl/4WGcuN H...",
"thumbnail":{
"sqDefault": "https://i.ytimg.com/vi/s_A7tiCV_XQ/default.jpg",
"hqDefault": "https://i.ytimg.com/vi/s_A7tiCV_XQ/hqdefault.jpg"
},
"player":{
"default": "https://www.youtube.com/watch?v=s_A7tiCV_XQ&feature=youtube_gdata_player",
"mobile": "https://m.youtube.com/details?v=s_A7tiCV_XQ"
},
"content":{
"5": "https://www.youtube.com/v/s_A7tiCV_XQ?version=3&f=videos&app=youtube_gdata",
"1": "rtsp://r3---sn-a5m7zu7r.c.youtube.com/CiILENy73wIaGQl0_ZUgtjvwsxMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp",
"6": "rtsp://r3---sn-a5m7zu7r.c.youtube.com/CiILENy73wIaGQl0_ZUgtjvwsxMYESARFEgGUgZ2aWRlb3MM/0/0/0/video.3gp"
},
"duration": 1594,
"aspectRatio": "widescreen",
"rating": 4.201516,
"likeCount": "2534",
"ratingCount": 3166,
"viewCount": 1113129,
"favoriteCount": 0,
"commentCount": 610,
"accessControl":{
"comment": "allowed",
"commentVote": "allowed",
"videoRespond": "moderated",
"rate": "allowed",
"embed": "allowed",
"list": "allowed",
"autoPlay": "allowed",
"syndicate": "allowed"
}
}