json解析2 - 复杂json解析

导入fastjson依赖的jar包

 <dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.60</version></dependency>

先看看数据结构：

对应json字符串：

{"item":[{"media_id":"DjkC7IK8dPuF6LkHXdpM7bGRF_ae0dk0ZG_0XIi-rvo","content":{"news_item":[{"title":"1","author":"欧阳宇","digest":"1","content":"neirong","content_source_url":"http://ouyangyu.com","thumb_media_id":"DjkC7IK8dPuF6LkHXdpM7S6ApFtUuIYUXJ9bgr4KTuA","show_cover_pic":0,"url":"url","thumb_url":"url","need_open_comment":1,"only_fans_can_comment":0},{"title":"1","author":"欧阳宇","digest":"1","content":"neirong","content_source_url":"http://ouyangyu.com","thumb_media_id":"DjkC7IK8dPuF6LkHXdpM7S6ApFtUuIYUXJ9bgr4KTuA","show_cover_pic":0,"url":"url","thumb_url":"url","need_open_comment":1,"only_fans_can_comment":0}],"create_time":1526465140,"update_time":1526465513},"update_time":1526465513},{"media_id":"DjkC7IK8dPuF6LkHXdpM7T_W4zTBQZtLsxEzFW1c2iE","content":{"news_item":[{"title":"1","author":"欧阳宇","digest":"1","content":"neirong","content_source_url":"http://ouyangyu.com","thumb_media_id":"DjkC7IK8dPuF6LkHXdpM7S6ApFtUuIYUXJ9bgr4KTuA","show_cover_pic":0,"url":"url","thumb_url":"url","need_open_comment":1,"only_fans_can_comment":0}],"create_time":1526465140,"update_time":1526465513},"update_time":1526465513}],"total_count":4,"item_count":4
}

解析代码：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;public class Test3 {public static void main(String[] args) throws Exception {String jsonStr = "{\"item\":[" +"{\"media_id\":\"DjkC7IK8dPuF6LkHXdpM7bGRF_ae0dk0ZG_0XIi-rvo\","+"\"content\":{\"news_item\":["+"{\"title\":\"1\",\"author\":\"欧阳宇\",\"digest\":\"1\","+"\"content\":\"neirong\","+"\"content_source_url\":\"http://ouyangyu.com\","+"\"thumb_media_id\":\"DjkC7IK8dPuF6LkHXdpM7S6ApFtUuIYUXJ9bgr4KTuA\","+"\"show_cover_pic\":0,"+"\"url\":\"url\","+"\"thumb_url\":\"url\","+"\"need_open_comment\":1,"+"\"only_fans_can_comment\":0"+"},"+"{\"title\":\"1\",\"author\":\"欧阳宇\",\"digest\":\"1\","+"\"content\":\"neirong\","+"\"content_source_url\":\"http://ouyangyu.com\","+"\"thumb_media_id\":\"DjkC7IK8dPuF6LkHXdpM7S6ApFtUuIYUXJ9bgr4KTuA\","+"\"show_cover_pic\":0,"+"\"url\":\"url\","+"\"thumb_url\":\"url\","+"\"need_open_comment\":1,"+"\"only_fans_can_comment\":0"+"}"+"],"+"\"create_time\":1526465140,"+"\"update_time\":1526465513"+"},"+"\"update_time\":1526465513"+"},"+"{\"media_id\":\"DjkC7IK8dPuF6LkHXdpM7T_W4zTBQZtLsxEzFW1c2iE\","+"\"content\":{\"news_item\":["+"{\"title\":\"1\",\"author\":\"欧阳宇\",\"digest\":\"1\","+"\"content\":\"neirong\","+"\"content_source_url\":\"http://ouyangyu.com\","+"\"thumb_media_id\":\"DjkC7IK8dPuF6LkHXdpM7S6ApFtUuIYUXJ9bgr4KTuA\","+"\"show_cover_pic\":0,"+"\"url\":\"url\","+"\"thumb_url\":\"url\","+"\"need_open_comment\":1,"+"\"only_fans_can_comment\":0"+"}"+"],"+"\"create_time\":1526465140,"+"\"update_time\":1526465513"+"},"+"\"update_time\":1526465513"+"}"+"],"+"\"total_count\":4," +    "\"item_count\":4"+"}";String jsonStr2 = "{\"list\":["+"{\"ref_date\":\"2018-05-16\",\"user_source\":0,\"msgid\":\"2455330874_1\",\"title\":\"fdsa\","+"\"int_page_read_user\":1,\"int_page_read_count\":1,\"ori_page_read_user\":0,\"ori_page_read_count\":0,"+"\"share_user\":0,\"share_count\":0,\"add_to_fav_user\":0,\"add_to_fav_count\":0},"+"{\"ref_date\":\"2018-05-16\",\"user_source\":0,\"msgid\":\"2455330883_1\",\"title\":\"1\","+"\"int_page_read_user\":1,\"int_page_read_count\":2,\"ori_page_read_user\":1,\"ori_page_read_count\":1,"+"\"share_user\":0,\"share_count\":0,\"add_to_fav_user\":0,\"add_to_fav_count\":0},"+"{\"ref_date\":\"2018-05-16\",\"user_source\":0,\"msgid\":\"2455330883_2\",\"title\":\"2\","+"\"int_page_read_user\":1,\"int_page_read_count\":1,\"ori_page_read_user\":1,\"ori_page_read_count\":1,"+"\"share_user\":0,\"share_count\":0,\"add_to_fav_user\":0,\"add_to_fav_count\":0},"+"{\"ref_date\":\"2018-05-16\",\"user_source\":0,\"msgid\":\"2455330883_3\",\"title\":\"3\",\"int_page_read_user\":1,\"int_page_read_count\":1,\"ori_page_read_user\":0,\"ori_page_read_count\":0,\"share_user\":0,\"share_count\":0,\"add_to_fav_user\":0,\"add_to_fav_count\":0},"+"{\"ref_date\":\"2018-05-16\",\"user_source\":0,\"msgid\":\"2455330883_4\",\"title\":\"4\",\"int_page_read_user\":1,\"int_page_read_count\":1,\"ori_page_read_user\":0,\"ori_page_read_count\":0,\"share_user\":0,\"share_count\":0,\"add_to_fav_user\":0,\"add_to_fav_count\":0},"+"{\"ref_date\":\"2018-05-16\",\"user_source\":0,\"msgid\":\"2455330883_5\",\"title\":\"5\",\"int_page_read_user\":1,\"int_page_read_count\":1,\"ori_page_read_user\":0,\"ori_page_read_count\":0,\"share_user\":0,\"share_count\":0,\"add_to_fav_user\":0,\"add_to_fav_count\":0}"+"]"+"}";//原json字符串System.out.println("原json字符串");System.out.println("jsonStr:"+jsonStr);//1.第一层解析JSONObject map1 = JSON.parseObject(jsonStr);JSONArray item = map1.getJSONArray("item");Integer total_count = (Integer)map1.get("total_count");Integer item_count = (Integer)map1.get("item_count");System.out.println("第一层解析");System.out.println("item:"+item.toJSONString());System.out.println("total_count:"+total_count);System.out.println("item_count:"+item_count);//2.第二层解析for(int i=0;i<item.size();i++){JSONObject map2 = item.getJSONObject(i);Integer update_time = (Integer) map2.get("update_time");JSONObject content = map2.getJSONObject("content");JSONArray news_item = content.getJSONArray("news_item");Integer create_time = (Integer) content.get("create_time");Integer update_time2 = (Integer) content.get("update_time");System.out.println("第二层解析");System.out.println("content:"+content.toJSONString());System.out.println("create_time:"+create_time);System.out.println("update_time2:"+update_time2);//3.第三层解析for(int j=0;j<news_item.size();j++){JSONObject map3 = news_item.getJSONObject(j);String title = (String) map3.get("title");String author = (String) map3.get("author");String content_source_url = (String) map3.get("content_source_url");Integer need_open_comment = (Integer) map3.get("need_open_comment");System.out.println("第三层解析");System.out.println("title:"+title);System.out.println("author:"+author);System.out.println("content_source_url:"+content_source_url);System.out.println("need_open_comment:"+need_open_comment);}}}}

结果：大致如图

结论：主要使用两个对象的方法

JSONObject map1 = JSON.parseObject(jsonStr); //map对象
JSONArray item = map1.getJSONArray("item");    //数组对象

注意：map获值的类型：字符串或者基本数据类型，注意数据类型

方法2：gons解析

       Gson g1=new Gson();Map m3 = g1.fromJson(jsonStr, HashMap.class);System.out.println(m3.toString());System.out.println(m3.get("item_count"));System.out.println(m3.get("item"));ArrayList l1=(ArrayList) m3.get("item");for(int i=0;i<l1.size();i++){Map m4 = (Map)l1.get(i);System.out.println("update_time:"+m4.get("update_time"));}

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