5.2 KiB
5.2 KiB
RabbitMQ
基本示例
生产者
@SpringBootTest
class MqDemoApplicationTests {
@Autowired
private RabbitTemplate rabbitTemplate;
/**
* 1. 测试发送消息,示例代码
* 2. 测试成功的情况
*/
@Test
void publishTest() {
String exchangeDirect = RabbitMQMessageListenerConstants.EXCHANGE_DIRECT;
String routingKeyDirect = RabbitMQMessageListenerConstants.ROUTING_KEY_DIRECT;
rabbitTemplate.convertAndSend(exchangeDirect, routingKeyDirect, "你好小球球~~~");
Bunny bunny = Bunny.builder().rabbitName("Bunny").age(2).build();
rabbitTemplate.convertAndSend(exchangeDirect, routingKeyDirect, JSON.toJSONString(bunny));
}
}
消费者
@Component
@Slf4j
public class MessageListenerOrder {
@RabbitListener(bindings = @QueueBinding(
exchange = @Exchange(value = EXCHANGE_DIRECT),
value = @Queue(value = QUEUE_NAME, durable = "true"),
key = ROUTING_KEY_DIRECT
)
)
public void processMessage(String dataString, Message message, Channel channel) {
System.out.println("消费端接受消息:" + dataString);
}
}
可靠性
在Rabbi中队列和交换机都是持久化的,自动删除都是False。
生产者确认
配置文件
rabbitmq:
host: ${bunny.rabbitmq.host}
port: ${bunny.rabbitmq.port}
username: ${bunny.rabbitmq.username}
password: ${bunny.rabbitmq.password}
virtual-host: ${bunny.rabbitmq.virtual-host}
publisher-confirm-type: correlated # 交换机确认
publisher-returns: true # 队列确认
RabbitMQ配置
[!NOTE]
@PostConstruct 注解
作用:在Bean依赖注入完成后执行初始化方法(构造器之后,afterPropertiesSet()
之前)。特点:
- 方法需无参、返回void,名称任意
- 执行顺序:构造器 → 依赖注入 →
@PostConstruct
- 若抛出异常,Bean创建会失败
注意:
- 代理类(如
@Transactional
)中,会在原始对象初始化时调用prototype
作用域的Bean每次创建均会执行- 避免耗时操作,推荐轻量级初始化
替代方案:
InitializingBean
接口 或@Bean(initMethod="xxx")
@Slf4j
@Configuration
@RequiredArgsConstructor
public class RabbitConfiguration implements RabbitTemplate.ConfirmCallback, RabbitTemplate.ReturnsCallback {
private final RabbitTemplate rabbitTemplate;
@PostConstruct
public void initRabbitTemplate() {
rabbitTemplate.setConfirmCallback(this);
rabbitTemplate.setReturnsCallback(this);
}
@Override
public void confirm(CorrelationData correlationData, boolean ack, String cause) {
System.out.println("============correlationData <回调函数打印> = " + correlationData);
System.out.println("============ack <输出> = " + ack);
System.out.println("============cause <输出> = " + cause);
}
@Override
public void returnedMessage(ReturnedMessage returnedMessage) {
// 发送到队列失败才会走这个
log.error("消息主体:{}", returnedMessage.getMessage().getBody());
log.error("应答码:{}", returnedMessage.getReplyCode());
log.error("消息使用的父交换机:{}", returnedMessage.getExchange());
log.error("消息使用的路由键:{}", returnedMessage.getRoutingKey());
}
}
测试失败的情况
交换机找不到
/* 测试失败交换机的情况 */
@Test
void publishExchangeErrorTest() {
String exchangeDirect = RabbitMQMessageListenerConstants.EXCHANGE_DIRECT;
String routingKeyDirect = RabbitMQMessageListenerConstants.ROUTING_KEY_DIRECT;
rabbitTemplate.convertAndSend(exchangeDirect, routingKeyDirect, "----失败的消息发送----");
Bunny bunny = Bunny.builder().rabbitName("Bunny").age(2).build();
rabbitTemplate.convertAndSend(exchangeDirect + "~", routingKeyDirect, JSON.toJSONString(bunny));
}
队列找不到
/* 测试失败队列的情况 */
@Test
void publishQueueErrorTest() {
String exchangeDirect = RabbitMQMessageListenerConstants.EXCHANGE_DIRECT;
String routingKeyDirect = RabbitMQMessageListenerConstants.ROUTING_KEY_DIRECT;
rabbitTemplate.convertAndSend(exchangeDirect, routingKeyDirect, "----失败的队列发送----");
Bunny bunny = Bunny.builder().rabbitName("Bunny").age(2).build();
rabbitTemplate.convertAndSend(exchangeDirect, routingKeyDirect + "~", JSON.toJSONString(bunny));
}
备份交换机
[!NOTE]
创建好的交换机是无法修改的,只能删除重新建立。
创建广播类型的交换机,因为没有路由键,只能通过广播的方式去找。
创建与备份交换机的队列,交换机是广播的模式,不指定路由键。
通过指定Alternate exchange
的交换机进行绑定。第一个填写的不是备份交换机,是投递交换机,之后通过Alternate exchange
绑定备份的交换机。