Gson解析新浪微博数据

JSON是JavaScript Object Notation的缩写，可见JSON来源于JavaScript。JSON数据是一系列键值对的集合。

JSON和XML的比较

JSON比XML体积小
JSON和JavaScript交互更加方便
JSON对数据的描述性没有XML好
JSON的速度要远远大于XML
JSON的解析要比XML的解析要方便

JSON已经被大多数开发人员所接受，在网络数据的传输当中应用非常广泛

Json的规格非常简单，只用一个页面几百个字就能说清楚，而且Douglas Crockford声称这个规格永远不必升级，因为该规定的都规定了。

1）并列的数据之间用逗号（"，"）分隔。

2）映射用冒号（"："）表示。

3）并列数据的集合（数组）用方括号("[]")表示。

4）映射的集合（对象）用大括号（"{}"）表示。

详情请看：http://www.json.org/json-zh.html

JSON文件格式化工具:http://jsonformatter.curiousconcept.com/

新浪微博的部分部件格式就像下面所示:在源码里有完整的微博数据，一次可以接收20篇微博。

{"statuses":[{"created_at":"Fri May 18 09:25:28 +0800 2012","id":3446966543302976,"mid":"3446966543302976","idstr":"3446966543302976","text":"知，和行之间，是质一般的鸿沟。很多人讲起道理来头头是道，做起事来一无所知，道理只是用来说的。","source":"<a href=\"http://www.xiaomi.com\" rel=\"nofollow\">小米手机</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":"许单单","name":"许单单","province":"11","city":"2","location":"北京 西城区","description":"专注互联网行业趋势、竞争格局和资本定价。【免责声明】本微博一切言论仅代表个人观点，旨在交流投资经验和教训，不构成任何投资建议。","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投资咨询公司CEO，3W咖啡创始人","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":"北朝鲜这批泼水无赖，小人之尤！近则不逊，远则怨！天天喂他，还要咬人！石油能源粮食日用品都靠中国，全是倒贴！","source":"<a href=\"http://m.weibo.com/web/cellphone.php#ipad\" rel=\"nofollow\">iPad客户端</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":"薛蛮子","name":"薛蛮子","province":"11","city":"5","location":"北京 朝阳区","description":"天使投资人薛蛮子 商业计划书请发信箱charlesxuesub@gmail.com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":"天使投资人、微博打拐发起人之一","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：中方要求朝方确保中国船员安全】针对3艘中国渔船近日被朝鲜方面抓扣报道，中国外交部下午称，中方正通过有关渠道与朝方保持密切沟通，争取有关问题尽早得到妥善解决。中方要求朝方确保中国船员安全与合法权益。答问实录：http://t.cn/zOm5zjU","source":"<a href=\"http://weibo.com/\" rel=\"nofollow\">新浪微博</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":"头条新闻","name":"头条新闻","province":"11","city":"8","location":"北京 海淀区","description":"每日播报全球各类重要资讯、突发新闻，全天24小时即时发布。欢迎报料、投稿，请发私信或者邮件：xlttnews@vip.sina.com。","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":"新浪新闻中心24小时播报全球重大新闻","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数据可以很方便的就把数据和java 类互相转换。因为微博JSON数据

public class ParseJsonMain extends Activity {/** Called when the activity is first created. */TextView jsonTv,userTv;InputStream in;@Overridepublic 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 blocke.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();}
}

这里主要是注意类对象，这个必须没有问题，才能正常的解析数据。

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 intpublic 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 intpublic 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;}}

以此类推，来分解json数据。

程序运行结果：

源码下载：

http://download.csdn.net/detail/comkingfly/4311809

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