JSON长度

import com.jayway.jsonpath.JsonPath;
import com.jayway.jsonpath.Predicate;
import net.minidev.json.JSONArray;
public class Test {
    public static String readjson(String json, String jsonPath) {
        try
        {
            Object value = JsonPath.read(json, jsonPath, new Predicate[0]);      

            if (value instanceof Integer)
              {
                return value.toString();
              }else if (value instanceof String)
              {
                    return value.toString();
              }else if (value instanceof Boolean)
              {
                    return value.toString();
              }else if (value instanceof JSONArray)
              {
                  JSONArray arr = (JSONArray)value;
                  if(!arr.isEmpty()){return arr.toJSONString();}
                  return "";
              }else if (value instanceof LinkedHashMap)
              {
                    return value.toString();
              }else if (value instanceof float)
              {
                    return value.toString();
              }else{
                  return  value.toString();
              }
              print("------------------------JsonPath详情value长度："+value+"----------------------");
        }
        catch(Exception e){
            return "pathnotfound";
        }
    }
}
//--------------------------------------------------------------------------------------------------------

public static void fun(){
    String response_data=prev.getResponseDataAsString();//prev为JMeter预定义变量
    String JsonPath="$.tts[0].text.length()";
     print("------------------------JsonPath："+JsonPath+"----------------------");
    String result=Test.readjson(response_data,JsonPath);
    int resultToNum=Integer.parseInt(result);
    print("------------------------详情长度："+result+"----------------------");
    log.info("------------------------详情长度："+result+"----------------------");
}
fun();