JSON是JavaScript Object Notation的縮寫，可見JSON來源于JavaScript。JSON資料是一系列鍵值對的集合。
JSON和XML的比較
- JSON比XML體積小
- JSON和JavaScript互動更加友善
- JSON對資料的描述性沒有XML好
- JSON的速度要遠遠大于XML
- JSON的解析要比XML的解析要友善
JSON已經被大多數開發人員所接受，在網絡資料的傳輸當中應用非常廣泛
Json的規格非常簡單，隻用一個頁面幾百個字就能說清楚，而且Douglas Crockford聲稱這個規格永遠不必更新，因為該規定的都規定了。
1） 并列的資料之間用逗号（"，"）分隔。
2） 映射用冒号（"："）表示。
3） 并列資料的集合（數組）用方括号("[]")表示。
4） 映射的集合（對象）用大括号（"{}"）表示。
詳情請看：http://www.json.org/json-zh.html
JSON檔案格式化工具:http://jsonformatter.curiousconcept.com/
新浪微網誌的部分部件格式就像下面所示:在源碼裡有完整的微網誌資料，一次可以接收20篇微網誌。
{
"statuses":[
{
"created_at":"Fri May 18 09:25:28 +0800 2012",
"id":3446966543302976,
"mid":"3446966543302976",
"idstr":"3446966543302976",
"text":"知，和行之間，是質一般的鴻溝。很多人講起道理來頭頭是道，做起事來一無所知，道理隻是用來說的。",
"source":"<a href=\"http://www.xiaomi.com\" rel=\"nofollow\">小米手機</a>",
"favorited":false,
"truncated":false,
"in_reply_to_status_id":"",
"in_reply_to_user_id":"",
"in_reply_to_screen_name":"",
"geo":null,
"user":{
"id":1558247760,
"idstr":"1558247760",
"screen_name":"許單單",
"name":"許單單",
"province":"11",
"city":"2",
"location":"北京 西城區",
"description":"專注網際網路行業趨勢、競争格局和資本定價。【免責聲明】本微網誌一切言論僅代表個人觀點，旨在交流投資經驗和教訓，不構成任何投資建議。",
"url":"http://blog.sina.com.cn/xudandanpku",
"profile_image_url":"http://tp1.sinaimg.cn/1558247760/50/5610765032/1",
"profile_url":"xddpku",
"domain":"xddpku",
"weihao":"",
"gender":"m",
"followers_count":143057,
"friends_count":932,
"statuses_count":6027,
"favourites_count":568,
"created_at":"Mon Mar 15 11:56:26 +0800 2010",
"following":true,
"allow_all_act_msg":false,
"geo_enabled":false,
"verified":true,
"verified_type":0,
"remark":"",
"allow_all_comment":false,
"avatar_large":"http://tp1.sinaimg.cn/1558247760/180/5610765032/1",
"verified_reason":"Danseq投資咨詢公司CEO，3W咖啡創始人",
"follow_me":false,
"online_status":0,
"bi_followers_count":654,
"lang":"zh-cn"
},
"reposts_count":1,
"comments_count":0,
"mlevel":0,
"visible":{
"type":0,
"list_id":0
}
},
{
"created_at":"Fri May 18 09:25:13 +0800 2012",
"id":3446966480167755,
"mid":"3446966480167755",
"idstr":"3446966480167755",
"text":"北北韓這批潑水無賴，小人之尤！近則不遜，遠則怨！天天喂他，還要咬人！石油能源糧食日用品都靠中國，全是倒貼！",
"source":"<a href=\"http://m.weibo.com/web/cellphone.php#ipad\" rel=\"nofollow\">iPad用戶端</a>",
"favorited":false,
"truncated":false,
"in_reply_to_status_id":"",
"in_reply_to_user_id":"",
"in_reply_to_screen_name":"",
"geo":null,
"user":{
"id":1813080181,
"idstr":"1813080181",
"screen_name":"薛蠻子",
"name":"薛蠻子",
"province":"11",
"city":"5",
"location":"北京 朝陽區",
"description":"天使投資人薛蠻子 商業計劃書請發信箱[email protected]或ctquan.com/manzi",
"url":"",
"profile_image_url":"http://tp2.sinaimg.cn/1813080181/50/5615039894/1",
"profile_url":"charlesxue",
"domain":"charlesxue",
"weihao":"",
"gender":"m",
"followers_count":2751028,
"friends_count":1629,
"statuses_count":44510,
"favourites_count":866,
"created_at":"Mon Sep 06 00:00:00 +0800 2010",
"following":true,
"allow_all_act_msg":true,
"geo_enabled":true,
"verified":true,
"verified_type":0,
"remark":"",
"allow_all_comment":true,
"avatar_large":"http://tp2.sinaimg.cn/1813080181/180/5615039894/1",
"verified_reason":"天使投資人、微網誌打拐發起人之一",
"follow_me":false,
"online_status":1,
"bi_followers_count":1329,
"lang":"zh-cn"
},
"retweeted_status":{
"created_at":"Thu May 17 18:53:02 +0800 2012",
"id":3446746988027751,
"mid":"3446746988027751",
"idstr":"3446746988027751",
"text":"【外交部：中方要求朝方確定中國船員安全】針對3艘中國漁船近日被北韓方面抓扣報道，中國外交部下午稱，中方正通過有關管道與朝方保持密切溝通，争取有關問題盡早得到妥善解決。中方要求朝方確定中國船員安全與合法權益。答問實錄：http://t.cn/zOm5zjU",
"source":"<a href=\"http://weibo.com/\" rel=\"nofollow\">新浪微網誌</a>",
"favorited":false,
"truncated":false,
"in_reply_to_status_id":"",
"in_reply_to_user_id":"",
"in_reply_to_screen_name":"",
"geo":null,
"user":{
"id":1618051664,
"idstr":"1618051664",
"screen_name":"頭條新聞",
"name":"頭條新聞",
"province":"11",
"city":"8",
"location":"北京 海澱區",
"description":"每日播報全球各類重要資訊、突發新聞，全天24小時即時釋出。歡迎報料、投稿，請發私信或者郵件：[email protected]。",
"url":"http://news.sina.com.cn/",
"profile_image_url":"http://tp1.sinaimg.cn/1618051664/50/5631943776/0",
"profile_url":"breakingnews",
"domain":"breakingnews",
"weihao":"",
"gender":"f",
"followers_count":12861287,
"friends_count":89,
"statuses_count":47001,
"favourites_count":6,
"created_at":"Fri Aug 28 16:34:36 +0800 2009",
"following":false,
"allow_all_act_msg":true,
"geo_enabled":true,
"verified":true,
"verified_type":3,
"remark":"",
"allow_all_comment":true,
"avatar_large":"http://tp1.sinaimg.cn/1618051664/180/5631943776/0",
"verified_reason":"新浪新聞中心24小時播報全球重大新聞",
"follow_me":false,
"online_status":1,
"bi_followers_count":80,
"lang":"zh-cn"
},
"reposts_count":1058,
"comments_count":855,
"mlevel":0,
"visible":{
"type":0,
"list_id":0
}
},
"reposts_count":2,
"comments_count":0,
"mlevel":0,
"visible":{
"type":0,
"list_id":0
}
},
],
"hasvisible":false,
"previous_cursor":0,
"next_cursor":3446963247215854,
"total_number":2196
主界面：使用Gson解析json資料可以很友善的就把資料和java 類互相轉換。因為微網誌JSON資料
public class ParseJsonMain extends Activity {
/** Called when the activity is first created. */
TextView jsonTv,userTv;
InputStream in;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
jsonTv=(TextView)findViewById(R.id.json_show);
userTv=(TextView)findViewById(R.id.user_json_show);
Gson gson = new Gson();
WeiboObject response = gson.fromJson(getJsonData("weibo.json"),WeiboObject.class);
jsonTv.setText(""+response.next_cursor);
List<StatusesInfo> results = response.statuses;
StringBuilder sb=new StringBuilder();
StringBuilder idShow=new StringBuilder();
StringBuilder retweeed=new StringBuilder();
int n=0;
for (StatusesInfo result : results) {
sb.append(result.created_at+"\n");
if(result.retweeted_status==null){
n++;
}else{
retweeed.append(result.retweeted_status.text+"\n");
}
idShow.append(result.visible.list_id+"\n");
}
Log.e("kingfly", "id="+idShow);
Log.e("kingfly", ""+n);
userTv.setText(sb.toString()+"\n"+retweeed.toString());
}
public String getJsonData(String fileName) {
String x = null;
try {
InputStream in = getResources().getAssets().open(fileName);
x = fileToString(in, "UTF-8");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return x;
}
public static String fileToString(InputStream in, String charset) {
StringBuffer sb = new StringBuffer();
try {
LineNumberReader reader = new LineNumberReader(new BufferedReader(
new InputStreamReader(in, charset)));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line).append(System.getProperty("line.separator"));
}
reader.close();
} catch (UnsupportedEncodingException e) {
} catch (IOException e) {
}
return sb.toString();
}
}
這裡主要是注意類對象，這個必須沒有問題，才能正常的解析資料。
public class WeiboObject {
public List<StatusesInfo> statuses;
@SerializedName("hasvisible")
public boolean hasvisible;
@SerializedName("previous_cursor")
public int previous_cursor;
@SerializedName("next_cursor")
public String next_cursor;
@SerializedName("total_number")
public int total_number;
}
public class StatusesInfo {
public String created_at;
public String id; // change to int
public String idstr;
public String text;
public boolean favorited;
public boolean truncated;
public String in_reply_to_status_id;
public String in_reply_to_user_id;
public String in_reply_to_screen_name;
public List<GeoInfo> geo;
public String mid; // change to int
public int reposts_count;
public int comments_count;
public int melvel;
public VisibleInfo visible;
public UserInfo user;
public RetweetedStatus retweeted_status;
public String source;
public List<GeoInfo> getGeo() {
return geo;
}
public void setGeo(List<GeoInfo> geo) {
this.geo = geo;
}
public String getIdstr() {
return idstr;
}
public void setIdstr(String idstr) {
this.idstr = idstr;
}
public UserInfo getUser() {
return user;
}
public void setUser(UserInfo user) {
this.user = user;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public String getCreated_at() {
return created_at;
}
public void setCreated_at(String created_at) {
this.created_at = created_at;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public boolean isFavorited() {
return favorited;
}
public void setFavorited(boolean favorited) {
this.favorited = favorited;
}
public boolean isTruncated() {
return truncated;
}
public void setTruncated(boolean truncated) {
this.truncated = truncated;
}
public String getIn_reply_to_status_id() {
return in_reply_to_status_id;
}
public void setIn_reply_to_status_id(String in_reply_to_status_id) {
this.in_reply_to_status_id = in_reply_to_status_id;
}
public String getIn_reply_to_user_id() {
return in_reply_to_user_id;
}
public void setIn_reply_to_user_id(String in_reply_to_user_id) {
this.in_reply_to_user_id = in_reply_to_user_id;
}
public String getIn_reply_to_screen_name() {
return in_reply_to_screen_name;
}
public void setIn_reply_to_screen_name(String in_reply_to_screen_name) {
this.in_reply_to_screen_name = in_reply_to_screen_name;
}
public String getMid() {
return mid;
}
public void setMid(String mid) {
this.mid = mid;
}
public int getReposts_count() {
return reposts_count;
}
public void setReposts_count(int reposts_count) {
this.reposts_count = reposts_count;
}
public int getComments_count() {
return comments_count;
}
public void setComments_count(int comments_count) {
this.comments_count = comments_count;
}
public int getMelvel() {
return melvel;
}
public void setMelvel(int melvel) {
this.melvel = melvel;
}
public VisibleInfo getVisible() {
return visible;
}
public void setVisible(VisibleInfo visible) {
this.visible = visible;
}
public RetweetedStatus getRetweeted_status() {
return retweeted_status;
}
public void setRetweeted_status(RetweetedStatus retweeted_status) {
this.retweeted_status = retweeted_status;
}
}
以此類推，來分解json資料。
程式運作結果：
源碼下載下傳：
http://download.csdn.net/detail/comkingfly/4311809
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