问题描述

我是一个新手，试图在 java 客户端中实现 Headers 交换.我知道这就是x-match"绑定参数的用途.当x-match"参数设置为any"时，只需一个匹配的标头值就足够了.或者，将x-match"设置为all"要求所有值必须匹配.但是任何人都可以为我提供一个框架代码以便更好地理解.

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.

推荐答案

对于使用 headers 交换，您只需将您的交换声明为 headers 类型:

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

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

然后你需要在消费者消费消息之前声明一个队列，它将成为消息的最终目的地:

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);

现在我们需要将交换绑定到声明绑定的队列.在此声明中，您可以设置要将消息从交换器路由到队列的标头.一个例子可能是:

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);
...

这将使用 headerName#1 和 headerName#2 创建绑定.我希望这会有所帮助！

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

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