JSON属性名不知道时，对JSON数据的解析——转数组

如下：想要取得data数组下的每组数据的

• ——>replies——>（变动id）——>self——>content的内容

{
    "data": [{
        "nick_name": "u5c0fu57ce",
        "content": "u6c34u7535u8d39u4e0du6309u7269u4ef7u5c40u5b9au4ef7u6536u53d6u3002
nu7535u7ebfu7535u7f06u7ebfu8defu8001u5316u751au81f3u7834u635fuff0cu5bb9u6613u53d1u751fu6f0fu7535u3001u89e6u7535u5371u9669u3002",
        "replies": {
            "164955758975185775": {
                "self": {
                    "nick_name": "u9ad8u53efu60e0",
                    "content": "u5df2u5bf9u7269u4e1au6536u8d39u8fdbu884cu76d1u7ba1uff0cu5982u6709u8fddu89c4u884cu4e3au5c06u5904u7f5au6574u6539u3002[u63e1u624b]nu5c06u8fdbu4e00u6b65u6392u67e5u7535u8defu7ba1u9053u95eeu9898uff0cu611fu8c22u4f60u7684u53cdu9988u3002",
                   
                }
            }
        },
       
        
    }, {
        "nick_name": "u968fu98ce",
        "content": "u6709u7684u5145u7535u6869u574fu4e86uff0cu5e0cu671bu5febu901fu4feeu7406u4e00u4e0b",
        "replies": {
            "164955729095210928": {
                "self": {
                    
                    "nick_name": "u9ad8u53efu60e0",
                    "content": "u8c22u8c22u4f60u7684u5efau8baeuff0cu5df2u91c7u7eb3[u63e1u624b]",
             
                }
            }
        },
    }, {
       
        "nick_name": "Bruce.Li",
        "content": "u6211u4eecu7684u5c0fu533au5bf9u6211u6765u8bf4u5c31u662fu5929u5802uff0cu5230u5904u90fdu662fu6811u6728u82b1u8349uff0cu51e0u4e4eu6ca1u6709u7a7au767du7684u571fu58e4u3002u800cu6700u8fd1u6211u5374u53d1u73b0u4e00u4e2au5f88u4e25u91cdu7684u95eeu9898u3002u6d47u5b8cu82b1u7684u6c34u7ecfu5e38u653eu8086u5730u6d41u6dccu7740uff0cu6c34u7ba1u5b50u968fu610fu88abu4e22u5728u4e00u4e2au6811u5751u91ccuff0cu9a6cu8defu4e0au6d41u6dccu4e86u79efu6c34uff0cu4e00u8fc7u8f66u5c31u4f1au6e85u8d77u6ce5u6c34u3002",
        
        "replies": {
            "164955455236202926": {
                "self": {
                    
                    "nick_name": "u9ad8u53efu60e0",
                    "content": "[u5472u7259]u597du7684uff0cu611fu8c22u60a8u7684u5efau8baeuff0cu5c06u91c7u53d6u6539u8fdbu63aau65bd",
                  
                }
            }
        },
       
    }]
}

• 须知：1、对json对象格式的数据，我们可以通过属性名来得到对应的数据

  JSONObject data= jsonData.getJSONObject(i);
              String nick_username=data.getString("nick_name");
  

• 2、对于数组类型的数据，可以通过遍历。该数据的data 就相当于一个数组

• 拿到每一条数据下的self 要先进入 "164955758975185775"这种变动ID层

  • 先进入replies层，这个直接利用先遍历数组data，再进行getstring（“replies”）拿到

  • 再将replies的数据转化为数组——json对象的数据转为数组，才可以不考虑属性名，利用遍历来获得数据。这是关键一步

  • 接下来就是遍历进入变动的ID层

  • ID层后 就可以再根据JSON对象 的self属性拿到 self层数据

  • 下同 拿到content

    JSONObject repliesData = JSONObject.parseObject(replies);
    JSONObject selfData=(JSONObject) repliesData.values().toArray()[0];
    

public class JSON_advice {
    public static String[] rply;
    public static String[] usercontent;
    public static String[] creatTime;
    public static String[] nickName;
    public  static  Map map ;
    public static Map Advice() throws IOException {
        rply=new String[50];
        usercontent=new String[50];
        creatTime=new String[50];
        nickName=new String[50];
        map= new HashMap();
        String fileName = "C:\Users\stype\Desktop\json.txt";
        String s = Files.readString(Paths.get(fileName));
        JSONObject jsonObject = JSONObject.parseObject(s); //转为json
        JSONArray jsonData=jsonObject.getJSONArray("data");
        for (int i = 0; i < jsonData.size(); i++) {
            JSONObject data= jsonData.getJSONObject(i);
            String nick_username=data.getString("nick_name");
            String content=data.getString("content");
            String replies=data.getString("replies");
            String creattime=data.getString("created_at");
            JSONObject repliesData = JSONObject.parseObject(replies);
            JSONObject selfData=(JSONObject) repliesData.values().toArray()[0];//obj转数组
            JSONObject self1 = JSONObject.parseObject(selfData.getString("self"));
            String rely=self1.getString("content");
            rply[i]=rely;
            usercontent[i]=content;
            creatTime[i]=creattime;
            nickName[i]=nick_username;
        }
        map.put("rply",rply );
        map.put("usercontent",usercontent );
        map.put("creatTime",creatTime );
        map.put("nicksName",nickName );
        return map;
    }