延迟消息

src/main/java/com/example/rabbitmq/config/CreateObjectQueue.java

@@ -10,4 +10,9 @@ public class CreateObjectQueue {
     public Queue ObjectQueue() {
         return new Queue("object,queue");
     }
+
+    @Bean
+    public Queue objectQueue1() {
+        return new Queue("object.queue");
+    }
 }

src/main/java/com/example/rabbitmq/config/ErrorConfig.java

@@ -0,0 +1,39 @@
+package com.example.rabbitmq.config;
+
+import org.springframework.amqp.core.Binding;
+import org.springframework.amqp.core.BindingBuilder;
+import org.springframework.amqp.core.DirectExchange;
+import org.springframework.amqp.core.Queue;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.amqp.rabbit.retry.MessageRecoverer;
+import org.springframework.amqp.rabbit.retry.RepublishMessageRecoverer;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ConditionalOnProperty(prefix = "spring.rabbitmq.listener.simple.retry", name = "enabled", havingValue = "true")
+public class ErrorConfig {
+    @Bean
+    public DirectExchange errorExchange() {
+        return new DirectExchange("error.exchange");
+    }
+
+    @Bean
+    public Queue errorQueue() {
+        return new Queue("error.queue");
+    }
+
+    @Bean
+    public Binding errorBinding(Queue errorQueue, DirectExchange errorExchange) {
+        return BindingBuilder
+                .bind(errorQueue())
+                .to(errorExchange())
+                .with("error");
+    }
+
+    @Bean
+    public MessageRecoverer messageRecoverer(RabbitTemplate rabbitTemplate) {
+        return new RepublishMessageRecoverer(rabbitTemplate, "error.exchange");
+    }
+}

src/main/java/com/example/rabbitmq/config/MqConfig.java

@@ -1,5 +1,7 @@
 package com.example.rabbitmq.config;
 
+import org.springframework.amqp.core.Queue;
+import org.springframework.amqp.core.QueueBuilder;
 import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
 import org.springframework.amqp.support.converter.MessageConverter;
 import org.springframework.context.annotation.Bean;
@@ -11,4 +13,12 @@ public class MqConfig {
     public MessageConverter messageConverter() {
         return new Jackson2JsonMessageConverter();
     }
+
+    // 设置消息唯一id
+    @Bean
+    public MessageConverter jacksonMessageConverter() {
+        Jackson2JsonMessageConverter jsonMessageConverter = new Jackson2JsonMessageConverter();
+        jsonMessageConverter.setCreateMessageIds(true);
+        return jsonMessageConverter;
+    }
 }

src/main/java/com/example/rabbitmq/listener/MqListener.java

@@ -93,4 +93,17 @@ public class MqListener {
     public void listenTopicQueue2(String message) {
         System.out.println("topic.queue2 收到了 【消息]" + message);
     }
+
+    /**
+     * 监听延迟队列
+     * @param message 消息
+     */
+    @RabbitListener(bindings = @QueueBinding(
+            value = @Queue(value = "delay.queue", durable = "true"),
+            exchange = @Exchange(value = "delay.direct", delayed = "true"),
+            key = "hi"
+    ))
+    public void listenDelayLazyQueue(String message) {
+        log.info("接收到 lazy.queue消息：{}", message);
+    }
 }

src/main/resources/application.yml

@@ -8,10 +8,14 @@ spring:
     username: root
     password: 123456
     port: 5672
-    host: 192.168.31.140
+#    host: 192.168.31.140
+    host: 192.168.2.156
     listener:
       simple:
         prefetch: 1
+        acknowledge-mode: none # 默认机制
+        retry:
+          enabled: true # 开启重试机制
     connection-timeout: 1s # 连接延迟
     template:
       retry:

src/test/java/com/example/rabbitmq/TestSendDelayMessage.java

@@ -0,0 +1,30 @@
+package com.example.rabbitmq;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.amqp.AmqpException;
+import org.springframework.amqp.core.Message;
+import org.springframework.amqp.core.MessagePostProcessor;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+public class TestSendDelayMessage {
+    @Autowired
+    private RabbitTemplate rabbitTemplate;
+
+    /**
+     * 发送延迟消息
+     * 如果有很多定时消息对CPU压力会很大，如果设置延迟消息很长会对CPU压力很大
+     */
+    @Test
+    void testSendDelayMessage() {
+    rabbitTemplate.convertAndSend("delay.direct", "hi", "hello", new MessagePostProcessor() {
+        @Override
+        public Message postProcessMessage(Message message) throws AmqpException {
+            message.getMessageProperties().setDelay(10000);
+            return message;
+        }
+    });
+    }
+}