SpringBoot 中 使用RabbtiMq 

如图使用redisTemplate 一样的简单方便

模拟发送邮件的情况

pom.xml  

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-amqpartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.amqpgroupId>
            <artifactId>spring-rabbit-testartifactId>
            <scope>testscope>
        dependency>

application.properties

spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.host=192.168.91.128
spring.rabbitmq.port=5672
 
## 根据自己情况而定，可以不用
spring.rabbitmq.listener.simple.acknowledge-mode=manual
spring.rabbitmq.listener.simple.prefetch=100

写在配置文件中，由 RabbitProperties 这个类进行读取，封装到ConnectionFactory 中。

MailConstants （常量）

public class MailConstants {
    public static final Integer DELIVERING = 0;//消息投递中
    public static final Integer SUCCESS = 1;//消息投递成功
    public static final Integer FAILURE = 2;//消息投递失败
    public static final Integer MAX_TRY_COUNT = 3;//最大重试次数
    public static final Integer MSG_TIMEOUT = 1;//消息超时时间
    public static final String MAIL_QUEUE_NAME = "javaboy.mail.queue";
    public static final String MAIL_EXCHANGE_NAME = "javaboy.mail.exchange";
    public static final String MAIL_ROUTING_KEY_NAME = "javaboy.mail.routing.key";
}

RabbitConfig （rabbitMq的配置类）

import org.javaboy.vhr.model.MailConstants;
import org.javaboy.vhr.service.MailSendLogService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class RabbitConfig {
    public final static Logger logger = LoggerFactory.getLogger(RabbitConfig.class);
    @Autowired
    CachingConnectionFactory cachingConnectionFactory;
 
    //发送邮件的
    @Autowired
    MailSendLogService mailSendLogService;
 
    @Bean
    RabbitTemplate rabbitTemplate() {
        RabbitTemplate rabbitTemplate = new RabbitTemplate(cachingConnectionFactory);
 
        //手动应答返回的标志
        rabbitTemplate.setConfirmCallback((data, ack, cause) -> {
            String msgId = data.getId();
            if (ack) {
                logger.info(msgId + ":消息发送成功");
                mailSendLogService.updateMailSendLogStatus(msgId, 1);//修改数据库中的记录，消息投递成功
            } else {
                logger.info(msgId + ":消息发送失败");
            }
        });
        rabbitTemplate.setReturnCallback((msg, repCode, repText, exchange, routingkey) -> {
            logger.info("消息发送失败");
        });
        return rabbitTemplate;
    }
 
    @Bean
    Queue mailQueue() {
        return new Queue(MailConstants.MAIL_QUEUE_NAME, true);
    }
 
    @Bean
    DirectExchange mailExchange() {
        return new DirectExchange(MailConstants.MAIL_EXCHANGE_NAME, true, false);
    }
 
    @Bean
    Binding mailBinding() {
        return BindingBuilder.bind(mailQueue()).to(mailExchange()).with(MailConstants.MAIL_ROUTING_KEY_NAME);
    }
 
}

MailSendTask（定时任务,发送）

@Component
public class MailSendTask {
    
    @Autowired
    MailSendLogService mailSendLogService;
    
    @Autowired
    RabbitTemplate rabbitTemplate;
    
    @Autowired
    EmployeeService employeeService;
 
    @Scheduled(cron = "0/10 * * * * ?")
    public void mailResendTask() {
        List logs = mailSendLogService.getMailSendLogsByStatus();
        if (logs == null || logs.size() == 0) {
            return;
        }
        logs.forEach(mailSendLog->{
            if (mailSendLog.getCount() >= 3) {
                mailSendLogService.updateMailSendLogStatus(mailSendLog.getMsgId(), 2);//直接设置该条消息发送失败
            }else{
                mailSendLogService.updateCount(mailSendLog.getMsgId(), new Date());
                Employee emp = employeeService.getEmployeeById(mailSendLog.getEmpId());
                /**
                 * 参数1：交换机名称
                 * 参数2 ：路由key
                 * 参数三：数据
                 * 参数4：作为唯一标识
                 *
                 */
                rabbitTemplate.convertAndSend(MailConstants.MAIL_EXCHANGE_NAME, MailConstants.MAIL_ROUTING_KEY_NAME, emp, new CorrelationData(mailSendLog.getMsgId()));
            }
        });
    }
}

MailReceiver（接收端）

@Component
public class MailReceiver {
 
    public static final Logger logger = LoggerFactory.getLogger(MailReceiver.class);
 
    @Autowired
    JavaMailSender javaMailSender;
    @Autowired
    MailProperties mailProperties;
    @Autowired
    TemplateEngine templateEngine;
    @Autowired
    StringRedisTemplate redisTemplate;
 
    @RabbitListener(queues = MailConstants.MAIL_QUEUE_NAME)
    public void handler(Message message, Channel channel) throws IOException {
        Employee employee = (Employee) message.getPayload();
        MessageHeaders headers = message.getHeaders();
        Long tag = (Long) headers.get(AmqpHeaders.DELIVERY_TAG);
        String msgId = (String) headers.get("spring_returned_message_correlation");
        if (redisTemplate.opsForHash().entries("mail_log").containsKey(msgId)) {
            //redis 中包含该 key，说明该消息已经被消费过
            logger.info(msgId + ":消息已经被消费");
            channel.basicAck(tag, false);//确认消息已消费
            return;
        }
        //收到消息，发送邮件
        MimeMessage msg = javaMailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(msg);
        try {
            helper.setTo(employee.getEmail());
            helper.setFrom(mailProperties.getUsername());
            helper.setSubject("入职欢迎");
            helper.setSentDate(new Date());
            Context context = new Context();
            context.setVariable("name", employee.getName());
            context.setVariable("posName", employee.getPosition().getName());
            context.setVariable("joblevelName", employee.getJobLevel().getName());
            context.setVariable("departmentName", employee.getDepartment().getName());
            //根据模板发送
            String mail = templateEngine.process("mail", context);
            helper.setText(mail, true);
            javaMailSender.send(msg);
            redisTemplate.opsForHash().put("mail_log", msgId, "javaboy");
            channel.basicAck(tag, false);
            logger.info(msgId + ":邮件发送成功");
        } catch (MessagingException e) {
            //手动应答， tag 消息id ，、
            channel.basicNack(tag, false, true);
            e.printStackTrace();
            logger.error("邮件发送失败：" + e.getMessage());
        }
    }
}

使用总结

0. rabbtMq的本地服务，得开启。（跟redis差不多）

1. 写 application.properties中的rabbitMq的连接配置等

2. rabbitConfig配置文件。（包括：交换机选择与队列的配置，绑定），选择的模式在这里配置

3. 直接使用，导入rabbitTemplate类，使用rabbitTemplate.convertAndSend()方法

4. 接收类

@RabbitListener(queues = MailConstants.MAIL_QUEUE_NAME)
 public void handler(Message message, Channel channel) throws IOException {

        业务逻辑了

        手动接收等等

}

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