updates

src/main/java/com/example/zxweb/controller/GatewayController.java

@@ -47,9 +47,9 @@ public class GatewayController {
         JSONObject requestBody = JSONObject.parseObject(format);
         JSONObject responseBody = IotUtils.postApi(IotApiEnum.getPathByText("向设备发送方法"), requestBody);
         JSONObject data = requestBody.getJSONObject("data");
-        if (!data.isEmpty()) {
+        if (data!=null) {
             JSONObject outputData = data.getJSONObject("outputData");
-            if (!outputData.isEmpty()) {
+            if (outputData!=null) {
                 List<JSONObject> list = outputData.getJSONArray("list").toJavaList(JSONObject.class);
                 List<JSONObject> subList = list.stream().skip((long) (pageNum - 1) * pageSize).limit(pageSize).collect(Collectors.toList());
                 outputData.put("list",subList);