修改topic订阅发布问题

file-center/src/main/resources/mapper/MqttTopicMapper.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.ho.filecenter.mapper.MqttTopicMapper">
+
+    <select id="getSnList" resultType="java.lang.String">
+        select topic from mqtt_topic
+    </select>
+</mapper>