JAVA--递归获取嵌套json中所有key

快来打我* 2024-03-22 17:10 71阅读 0赞

当我们遇到复杂嵌套json，不知道其中有哪些属性，但是又想取到每条数据的所有值，并且想要拼接key让数据mapping成（全路径名称：值）的方式，可以参照如下方式：

import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    import org.apache.commons.lang3.StringUtils;
    
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.Map;
    
    public class JsonUtil {
        
        public static void main(String[] args) {
        
            String jsonStr = "{\"k8s_app_name\":\"roc\",\"json_extract\":{\"data\":{\"volume\":6,\"rcu\":{\"battery\":{\"temperature\":32,\"chargingStatus\":1,\"percent\":99}},\"robotStatus\":1,\"asrStatus\":1},\"serviceCode\":\"\",\"resultCode\":0,\"rcuId\":\"5013951A62CB\",\"source\":\"ROC\",\"robotId\":\"5013951A62CB\",\"resultInfo\":\"\",\"accountId\":\"AZ019179\",\"robotType\":\"patrol\",\"rodType\":\"reportMetrics\",\"tenantId\":\"patrol_jindi3\",\"guid\":\"9c20192006b845fd90714d5069b93d8b\",\"tag\":\"\",\"moduleId\":\"reportStatus\",\"timestamp\":\"2023-03-31T23:59:58.672+08:00\"},\"label\":\"bj-prod-221_roc_roc_roc-operation-service_harixaudit\",\"k8s_svc_name\":\"roc-operation-service\",\"k8s_env_name\":\"bj-prod-221\",\"output\":\"eskafka\"}";
    
            HashMap<String, Object> map = new HashMap<>();
            Map<String, Object> resultMap = analysisJson(jsonStr, "", map);
    
            Iterator<String> iterator = resultMap.keySet().iterator();
            while (iterator.hasNext()) {
        
                String next = iterator.next();
                System.out.println("result_key: " + next);
            }
        }
    
        public static Map<String, Object> analysisJson(String jsonStr, String flag, Map<String, Object> jsonMap) {
        
            try {
        
                JSONObject jsonObject = JSON.parseObject(jsonStr);
                Iterator it = jsonObject.keySet().iterator();
                while (it.hasNext()) {
        
                    String key = it.next().toString();
                    Object object = jsonObject.get(key);
                    if (null != object && isJson(object.toString())) {
        //如果key中是一个json对象
                        String path = "";
                        if (StringUtils.isNotBlank(flag)) {
        
    //                    path = flag + "." + key;
                            path = flag + "_" + key.replaceAll("\\$", "_D_");
                        } else {
        
                            path = key.replaceAll("\\$", "_D_");
                        }
    //                    jsonMap.put(path, object);
                        analysisJson(object.toString(), path, jsonMap);
                    } else {
        //如果key中是其他
                        String path = "";
                        if (StringUtils.isNotBlank(flag)) {
        
    //                    path = flag + "." + key;
                            path = flag + "_" + key.replaceAll("\\$", "_D_");
                        } else {
        
                            path = key.replaceAll("\\$", "_D_");
                        }
                        System.out.println(path + ":" + object.toString() + " ");
                        jsonMap.put(path, object);
                    }
                }
    
            } catch (Exception ignored) {
        
    
            }
            return jsonMap;
        }
    
        public static boolean isJson(String str) {
        
            if (StringUtils.isBlank(str)) {
        
                return false;
            }
            Object parse = null;
            try {
        
                parse = JSON.parse(str);
            } catch (Exception e) {
        
                return false;
            }
            if (parse instanceof JSONObject) {
        
                return true;
            }
            return false;
        }
    }