消息的持久化

.idea/uiDesigner.xml

@@ -0,0 +1,124 @@
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src/main/java/io/jiulinxiri/rabbitmq/three/README.md

@@ -1,4 +1,4 @@
-## 队列的持久化
+### 队列的持久化
 之前我们创建的队列都是非持久化的，rabbitmq 如果重启的化，该队列就会被删除掉，如果
 要队列实现持久化 需要在声明队列的时候把 durable 参数设置为持久化
 ```java
@@ -12,4 +12,15 @@ channel.queueDeclare (ACK QUEUE NAME, durable, exclusive: false, autoDelete: fal
 
 以下为控制台中持久化与非持久化队列的 UI 显示区
 
-<img src="https://vip2.loli.io/2021/11/29/QzOEIWBaY1yUukt.png" style="width:60%"/>
+<img src="https://vip2.loli.io/2021/11/29/QzOEIWBaY1yUukt.png" style="width:60%"/>
+
+### 消息的持久化
+消息实现持久化需要在消息生产者修改代码，MessageProperties.PERSISTENT_TEXT_PLAIN 添
+加这个属性。
+```java
+channel.basicPublish("", ACK_QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes());
+```
+注: 将消息标记为持久化并不能完全保证不会丢失消息。尽管它告诉 RabbitMQ 将消息保存到磁盘，但是
+这里依然存在当消息刚准备存储在磁盘的时候 但是还没有存储完，消息还在缓存的一个间隔点。此时并没
+有真正写入磁盘。持久性保证并不强，但是对于我们的简单任务队列而言，这已经绰绰有余了。如果需要
+更强有力的持久化策略。

src/main/java/io/jiulinxiri/rabbitmq/three/Task02.java

@@ -1,6 +1,7 @@
 package io.jiulinxiri.rabbitmq.three;
 
 import com.rabbitmq.client.Channel;
+import com.rabbitmq.client.MessageProperties;
 import io.jiulinxiri.rabbitmq.utils.RabbitMqUtils;
 
 import java.io.IOException;
@@ -19,7 +20,10 @@ public class Task02 {
         Scanner scanner = new Scanner(System.in);
         while (scanner.hasNext()) {
             String message = scanner.next();
-            channel.basicPublish("", ACK_QUEUE_NAME, null, message.getBytes());
+//            channel.basicPublish("", ACK_QUEUE_NAME, null, message.getBytes());
+            // 消息的持久化
+            // MessageProperties.PERSISTENT_TEXT_PLAIN代表的是消息的持久化
+            channel.basicPublish("", ACK_QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes());
             System.out.println(message + " 消息发送完成！");
         }
     }