The sendMessage() function creates an AsyncMessage, which is an implementation of the IMessage interface, and then sends the message using the producer’s send() method.

sendMessage()函数先创建一个AsyncMessage，其是IMessage接口的一个实现，然后使用producer的send()方法发送此消息。

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The sendMessage() function creates an AsyncMessage, which is an implementation of the IMessage interface, and then sends the message using the producer’s send() method.

sendMessage()函数先创建一个AsyncMessage，其是IMessage接口的一个实现，然后使用producer的send()方法发送此消息。

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