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                ## return消息機制 1. return listener用于處理一些不可路由的消息; 2. 我們的消息生產者,通過制定一個exchange和routingkey,把消息送達到某一個隊列中去,然后我們的消費者監聽隊列,進行消費處理操作; 3. 但是在某些情況下,如果我們在發送消息的時候,當前的exchange不存在或者制定的路由key路由不到,這個時候如果我們需要監聽這種不可達的消息,就要使用return listener; ## 關鍵配置項 mandatory :如果為true,則監聽器會接收到路由不可達的消息,然后進行后續處理,如果為false,那么broker端自動刪除該消息; ## return消息機制流程 ![](https://img.kancloud.cn/66/6b/666b8ba0ce5fd42e105cc9e2bef81cce_1142x434.png)
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