問題描述

我是一個新手，試圖在 java 客戶端中實現 Headers 交換.我知道這就是x-match"綁定參數的用途.當x-match"參數設置為any"時，只需一個匹配的標頭值就足夠了.或者，將x-match"設置為all"要求所有值必須匹配.但是任何人都可以為我提供一個框架代碼以便更好地理解.

i am a newbie trying to implement Headers exchange in java client . im aware that This is what the "x-match" binding argument is for. When the "x-match" argument is set to "any", just one matching header value is sufficient. Alternatively, setting "x-match" to "all" mandates that all the values must match. but can anyone provide me a skeleton code for better understanding.

推薦答案

對于使用 headers 交換，您只需將您的交換聲明為 headers 類型:

For using a headers exchange you just need to declare your exchange as headers type:

channel.exchangeDeclare("myExchange", "headers", true);

然后你需要在消費者消費消息之前聲明一個隊列，它將成為消息的最終目的地:

Then you need to declare a queue that will be the final destination of the messages before a consumer consumes them:

channel.queueDeclare("myQueue", true, false, false, null);

現在我們需要將交換綁定到聲明綁定的隊列.在此聲明中，您可以設置要將消息從交換器路由到隊列的標頭.一個例子可能是:

Now we need to bind the exchange to queue declaring a binding. In this declaration is where you set which headers you want for routing messages from your exchange to your queue. An example could be:

Map<String, Object> bindingArgs = new HashMap<String, Object>();
bindingArgs.put("x-match", "any"); //any or all
bindingArgs.put("headerName#1", "headerValue#1");
bindingArgs.put("headerName#2", "headerValue#2");

...
channel.queueBind("myQueue", "myExchange", "", bindingArgs);
...

這將使用 headerName#1 和 headerName#2 創建綁定.我希望這會有所幫助！

This will create the binding using headerName#1 and headerName#2. I hope this helps!

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