RabbitMQ系列-消息确认(发送确认)

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1.需要将Template模版的publisherConfirms或publisherReturns的属性设置为true，此外ConnectionFactory要配置为CachingConnectionFactory的实现类

    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
        connectionFactory.setHost(host);
        connectionFactory.setPort(port);
        connectionFactory.setUsername(username);
        connectionFactory.setPassword(password);
        /**消息确认*/
        connectionFactory.setPublisherConfirms(true);
        /**消息回调*/
        connectionFactory.setPublisherReturns(true);
        return connectionFactory;
    }

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2.需设置mandatory=true,否则不回回调,消息就丢了

    @Bean
    @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
    public RabbitTemplate rabbitTemplate() {
        RabbitTemplate template = new RabbitTemplate(connectionFactory());

        template.setMandatory(true);

        template.setConfirmCallback(new RabbitTemplate.ConfirmCallback() {
            @Override
            public void confirm(CorrelationData correlationData, boolean b, String s) {
                System.out.println("消息确认 ===== ack,是否确认 : " + b + ", 错误原因 : " + s);
                if(correlationData != null){
                    System.out.println("correlationData : " + correlationData.toString());
                }
            }
        });

        template.setReturnCallback(new RabbitTemplate.ReturnCallback() {
            @Override
            public void returnedMessage(Message message, int i, String s, String s1, String s2) {
                System.out.println("消息回调机制 ====== i :" + i + " , s(错误信息) : " + s + " , s1(交换机) : " + s1 + ", s2(队列) :" + s2);
                if(message != null){
                    System.out.println("消息回调机制: message :" + message.toString());
                }
            }
        });

        return template;
    }

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3.消息确认的测试用例

@Component
public class RabbitMQSender {

    private String queueName = "firstQueue";

    private String routingkey = "first";

    @Autowired
    private RabbitAdmin admin;

    @Autowired
    private RabbitTemplate template;

    public void send() throws IOException, TimeoutException {

        System.out.println("开始发送消息....");

        AMQP.BasicProperties persistentTextPlain = com.rabbitmq.client.MessageProperties.PERSISTENT_TEXT_PLAIN;
        System.out.println("success:");
        template.convertAndSend("direct", routingkey, "send message by exchange and routingkey..");

        System.out.println("error:rountingkey");
        template.convertAndSend("direct", routingkey + "1", "send message by exchange and routingkey..");

        System.out.println("error:交换机");
        template.convertAndSend("direct1", routingkey, "send message by exchange and routingkey..");
    }
}

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4.结论

• 如果消息没有到exchange,则confirm回调,ack=false
• 如果消息到达exchange,则confirm回调,ack=true
• exchange到queue成功,则不回调return
• exchange到queue失败,则回调return(需设置mandatory=true,否则不回回调,消息就丢了)