json解析2 - 复杂json解析

电玩女神 2022-12-10 15:00 251阅读 0赞

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：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpZ3VhbmdfODIw_size_16_color_FFFFFF_t_70][]

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

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpZ3VhbmdfODIw_size_16_color_FFFFFF_t_70 1][]

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  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpZ3VhbmdfODIw_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpZ3VhbmdfODIw_size_16_color_FFFFFF_t_70 3][]

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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