Spring Rabbit Mq的Ack示例

@Configuration
public class RabbitMQConfig {

    @Value("${spring.rabbitmq.host}")
    private String host;

    @Value("${spring.rabbitmq.port}")
    private int port;

    @Value("${spring.rabbitmq.username}")
    private String username;

    @Value("${spring.rabbitmq.password}")
    private String password;

    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
        connectionFactory.setHost(host);
        connectionFactory.setPort(port);
        connectionFactory.setUsername(username);
        connectionFactory.setPassword(password);
        return connectionFactory;
    }

    @Bean
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        rabbitTemplate.setMandatory(true);
        return rabbitTemplate;
    }

    @Bean
    public SimpleRabbitListenerContainerFactory rabbitListenerContainerFactory(ConnectionFactory connectionFactory) {
        SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
        factory.setConnectionFactory(connectionFactory);
        factory.setAcknowledgeMode(AcknowledgeMode.MANUAL); // 手动确认消息
        return factory;
    }

}

@Component
public class MessageConsumer {

    @RabbitListener(queues = "myQueue")
    public void handleMessage(Message message, Channel channel) throws IOException {
        try {
            // 处理消息
            System.out.println("Received message: " + new String(message.getBody()));

            // 手动确认消息
            channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
        } catch (Exception e) {
            // 发生异常时，拒绝消息并重新入队
            channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, true);
        }
    }

}

@Component
public class MessageProducer {

    @Autowired
    private RabbitTemplate rabbitTemplate;

    public void sendMessage(String message) {
        rabbitTemplate.convertAndSend("myQueue", message);
    }

}