使用JSONObject.toJSONString过滤掉值为空的key

public static String getJsonResult(int status, String msg, Object data){undefined
        Map<String, Object> resultMap=new HashMap<String, Object>();        
        resultMap.put("status", status);
        resultMap.put("msg", msg);
        resultMap.put("data", data);
        return JSONObject.toJSONString(resultMap);
    }
public static void main(String[] args) {undefined
        System.out.println(getJsonResult(1, "success", null));
    }

JSONObject.toJSONString(Object object, SerializerFeature... features)  

    public static String getJsonResult(int status, String msg, Object data){undefined
        Map<String, Object> resultMap=new HashMap<String, Object>();
        resultMap.put("status", status);
        resultMap.put("msg", msg);
        resultMap.put("data", data);
        return JSONObject.toJSONString(resultMap,SerializerFeature.WriteMapNullValue);
    }

public static void main(String[] args) {undefined
        System.out.println(getJsonResult(1, "success", null));
    }

String value = JSONObject.toJSONString(objectData, SerializerFeature.WriteMapNullValue);