RocketMQ實現發佈-訂閱模式

1.爲了減小報錯，多加了個fastjson的包java     <dependency>     <groupId>com.alibaba.rocketmq</groupId>     <artifactId>rocketmq-client</artifactId>     <version>3.0.10.1</version>    </dependency>    <dependency>  

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