fastjson tool class writing

package test;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import org.mortbay.util.ajax.JSON;

import java.util.*;

public class FastJSONUtils {

    public static void main(String[] args) {

        Map iotMsg = new HashMap<String, Map<String,Map<String,Object>>>();

        Map headMsg = new HashMap();
        headMsg.put("method","iotmon");
        headMsg.put("gw_id","pg");
        headMsg.put("sensor_id","11");
        headMsg.put("msg_time",new Long(1531105889464L));
        headMsg.put("msg_id",new Integer(256));
        headMsg.put("version","1.0");

        iotMsg.put("head",headMsg);

//        Set set = headMsg.keySet();
//        Collection values = headMsg.values();
//        System.out.println(set.toString());
//        System.out.println(values.toString());
//        Object head = iotMsg.get("head");
//        System.out.println(head);
        Map inspectMsg = new HashMap<String,Object>();
        inspectMsg.put("f0",new String("14.6,10.8,12.4,38.6,39.4,58.2,58.24,394.4,375,304.4"));
        Map<String,Map<String, Object>> bodyMsg = new HashMap<String, Map<String, Object>>();
        bodyMsg.put("inspect",inspectMsg);
        iotMsg.put("body",bodyMsg);

        String str_json = FastJSONUtils.convertMapToJson(iotMsg);
        System.out.println("str_json :" + str_json);

        String head = FastJSONUtils.getJsonString("head", str_json);

        //System.out.println(FastJSONUtils.getJsonString("sensor_id","head"));//会报错，必须转成map才能取出key的value值
        Map<String, Object> map = FastJSONUtils.parseJsonToMap(head);
        System.out.println("map对象是：" + map);
        System.out.println(map.get("method"));

        String body = FastJSONUtils.getJsonString("body", str_json);
        String inspect = FastJSONUtils.getJsonString("inspect", body);
        System.out.println(inspect);
       // String f0 = FastJSONUtils.getJsonString("f0", "inspect");
        Map<String, Object> mapinsp = FastJSONUtils.parseJsonToMap(inspect);
        System.out.println("mapinsp对象是：" + mapinsp);
        System.out.println(mapinsp.get("f0"));
        
     

    }



    /**
     * 将Map转换成json
     * @param map
     * @author dd123
     * @date 2020-6-13
     */
    public static String convertMapToJson(Map<String, Object> map){
        return JSON.toString(map);
    }
    /**
     * 将Object转换成json
     * @param obj
     * @author dd123
     * @date 2020-3-12
     */
    public static String convertObjToJson(Object obj,SerializerFeature feature){
        return com.alibaba.fastjson.JSON.toJSONString(obj,feature);
    }

    /**
     * 将Object转换成json
     * @param obj
     * @author lihan
     * @date 2019-3-12
     */
    public static String convertObjToJson(Object obj){
        return com.alibaba.fastjson.JSON.toJSONString(obj);
    }


    /**
     * 获取json的类型
     * @param json
     * @author dd123
     * @date 2021-2-13
     */
    public static JsonType getJSONType(String json) {
        /**    if (StringUtils.isEmpty(json)) {
         return JsonType.JSON_TYPE_ERROR;
         }
         **/

        final char[] strChar = json.substring(0, 1).toCharArray();
        final char firstChar = strChar[0];

        if (firstChar == '{') {
            return JsonType.JSON_TYPE_OBJECT;
        } else if (firstChar == '[') {
            return JsonType.JSON_TYPE_ARRAY;
        } else {
            return JsonType.JSON_TYPE_ERROR;
        }
    }

    /**
     * 获取指定key的值
     * @param json
     * @author wangyl
     * @date 2021-2-13
     */
    public static String getJsonString(String key, String json) {
        JSONObject jsonObject = com.alibaba.fastjson.JSON.parseObject(json);
        return jsonObject.getString(key);
    }

    /**
     * 获取指定key的值
     * @param json
     * @author dd123
     * @date 2019-6-13
     */
    public static int getJsonInt(String key, String json) {
        JSONObject jsonObject = com.alibaba.fastjson.JSON.parseObject(json);
        return jsonObject.getInteger(key);
    }

    /**
     * 获取指定key的值
     * @param json
     * @author dd123
     * @date 2019-6-13
     */
    public static long getJsonLong(String key, String json) {
        JSONObject jsonObject = com.alibaba.fastjson.JSON.parseObject(json);
        return jsonObject.getLongValue(key);
    }

    /**
     * 将json解析成map
     * @author dd123
     * @date 2020-6-13
     */
    //@SuppressWarnings("unchecked")
    public static Map<String,Object> parseJsonToMap(String mapJson){
        return (Map<String,Object>)JSONObject.parse(mapJson);
    }

    public enum JsonType {
        JSON_TYPE_OBJECT,
        JSON_TYPE_ARRAY,
        JSON_TYPE_ERROR
    }


}