cassandra+spring-boot使用简记，亲测可用

一. spring-boot 融会cassandra

1. maven 依附

         <!--cassandra 配置-->
           <!--<dependency>
               <groupId>org.springframework.data</groupId>
               <artifactId>spring-data-cassandra</artifactId>
           </dependency>--> //不要引入了，避免启动时，必需保证cassandra可用
           <dependency>
               <groupId>com.datastax.cassandra</groupId>
               <artifactId>cassandra-driver-core</artifactId>
               <version>3.4.0</version>
           </dependency>
   
           <dependency>
               <groupId>com.datastax.cassandra</groupId>
               <artifactId>cassandra-driver-mapping</artifactId>
               <version>3.4.0</version>
           </dependency>      <!--