【JMeter】获取json响应报文中数组长度

 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();
               }
         }
         catch(Exception e){
             return "pathnotfound";
         }
     }
 }
 //------------------------------------------------------------------------------------------------------------------
 public static void fun(){
     String response_data=prev.getResponseDataAsString();//prev为JMeter预定义变量
     String JsonPath="$.data.detail.length()";
     String result=Test.readjson(response_data,JsonPath);
     int resultToNum=Integer.parseInt(result);
     log.info("------------------------详情长度："+result+"----------------------");
 }
 fun();