SpringBoot+RabbitMQ，发送邮件

RabbitMQ、邮箱配置

# rabbitmq
spring.rabbitmq.host=
spring.rabbitmq.port=
#spring.rabbitmq.virtual-host=
spring.rabbitmq.username=
spring.rabbitmq.password=
# 开启confirms回调 P -> Exchange
spring.rabbitmq.publisher-confirms=true
# 开启returnedMessage回调 Exchange -> Queue
spring.rabbitmq.publisher-returns=true
# 设置手动确认(ack) Queue -> C
spring.rabbitmq.listener.simple.acknowledge-mode=manual
spring.rabbitmq.listener.simple.prefetch=100

# mail
spring.mail.host=smtp.163.com
spring.mail.username=
spring.mail.password=
spring.mail.from=
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

发送邮件配置类

@Component
@Slf4j
public class MailUtil {

    @Value("${spring.mail.from}")
    private String from;

    @Autowired
    private JavaMailSender mailSender;

    /**
     * 发送简单邮件
     *
     * @param mail
     */
    public boolean send(Mail mail) {
        String to = mail.getTo();// 目标邮箱
        String title = mail.getTitle();// 邮件标题
        String content = mail.getContent();// 邮件正文

        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(from);
        message.setTo(to);
        message.setSubject(title);
        message.setText(content);

        try {
            mailSender.send(message);
            log.info("邮件发送成功");
            return true;
        } catch (MailException e) {
            log.error("邮件发送失败, to: {}, title: {}", to, title, e);
            return false;
        }
    }

    /**
     * 发送附件邮件
     *
     * @param mail 邮件
     * @param file 附件
     */
    public boolean sendAttachment(Mail mail, File file) {
        String to = mail.getTo();
        String title = mail.getTitle();
        String content = mail.getContent();

        MimeMessage message = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(title);
            helper.setText(content);
            FileSystemResource resource = new FileSystemResource(file);
            String fileName = file.getName();
            helper.addAttachment(fileName, resource);
            mailSender.send(message);
            log.info("附件邮件发送成功");
            return true;
        } catch (Exception e) {
            log.error("附件邮件发送失败, to: {}, title: {}", to, title, e);
            return false;
        }
    }

}

JsonUtil

@Slf4j
public class JsonUtil {

    private static ObjectMapper objectMapper = new ObjectMapper();
    private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";

    static {
        // 对象的所有字段全部列入
        objectMapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);
        // 取消默认转换timestamps形式
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        // 忽略空bean转json的错误
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        // 统一日期格式
        objectMapper.setDateFormat(new SimpleDateFormat(DATE_FORMAT));
        // 忽略在json字符串中存在, 但在java对象中不存在对应属性的情况, 防止错误
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    }

    public static <T> String objToStr(T obj) {
        if (null == obj) {
            return null;
        }

        try {
            return obj instanceof String ? (String) obj : objectMapper.writeValueAsString(obj);
        } catch (Exception e) {
            log.warn("objToStr error: ", e);
            return null;
        }
    }

    public static <T> T strToObj(String str, Class<T> clazz) {
        if (StringUtils.isBlank(str) || null == clazz) {
            return null;
        }

        try {
            return clazz.equals(String.class) ? (T) str : objectMapper.readValue(str, clazz);
        } catch (Exception e) {
            log.warn("strToObj error: ", e);
            return null;
        }
    }

    public static <T> T strToObj(String str, TypeReference<T> typeReference) {
        if (StringUtils.isBlank(str) || null == typeReference) {
            return null;
        }

        try {
            return (T) (typeReference.getType().equals(String.class) ? str : objectMapper.readValue(str, typeReference));
        } catch (Exception e) {
            log.error("strToObj error", e);
            return null;
        }
    }

}

MessageHelper

public class MessageHelper {

    public static Message objToMsg(Object obj){
        if (null == obj){
            return null;
        }
        Message message = MessageBuilder.withBody(JsonUtil.objToStr(obj).getBytes()).build();
        message.getMessageProperties().setDeliveryMode(MessageDeliveryMode.PERSISTENT);//消息持久化
        message.getMessageProperties().setContentType(MessageProperties.CONTENT_TYPE_JSON);
        return message;
    }

    public static <T> T msgToObj(Message message,Class<T> clazz){
        if (null == message || null == clazz){
            return null;
        }
        String str = new String(message.getBody());
        T obj = JsonUtil.strToObj(str, clazz);
        return obj;
    }
}

RabbitConfig

@Configuration
@Slf4j
public class RabbitConfig {
    @Autowired
    private CachingConnectionFactory connectionFactory;
    @Autowired
    private MsgLogService msgLogService;

    @Bean
    public RabbitTemplate rabbitTemplate(){
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        rabbitTemplate.setMessageConverter(converter());

        //消息是否成功发送到 Exchange          CorrelationData
        rabbitTemplate.setConfirmCallback((correlationData,ack,cause)->{
            if (ack){
                log.info("消息成功发送到Exchange");
                String msgId = correlationData.getId();
                msgLogService.updateStatus(msgId, Constant.MsgLogStatus.DELIVER_SUCCESS);
            } else {
                log.info("消息发送到Exchange失败, {}, cause: {}",correlationData,cause);
            }
        });

        // 触发setReturnCallback回调必须设置mandatory=true, 否则Exchange没有找到Queue就会丢弃掉消息, 而不会触发回调
        rabbitTemplate.setMandatory(true);
        // 消息是否从Exchange路由到Queue, 注意: 这是一个失败回调, 只有消息从Exchange路由到Queue失败才会回调这个方法
        rabbitTemplate.setReturnCallback((message, replyCode, replyText, exchange, routingKey)->{
            log.info("消息从Exchange路由到Queue失败: exchange: {}, route: {}, replyCode: {}, replyText: {}, message: {}", exchange, routingKey, replyCode, replyText, message);
        });

        return rabbitTemplate;
    }

    @Bean
    public Jackson2JsonMessageConverter converter(){
        return new Jackson2JsonMessageConverter();
    }


    public static final String MAIL_QUEUE_NAME = "mail.queue";
    public static final String MAIL_EXCHANGE_NAME = "mail.exchange";
    public static final String MAIL_ROUTING_KEY_NAME = "mail.routing.key";

    //创建queue
    @Bean(name = "mailQueue")
    public Queue mailQueue(){
        return new Queue(MAIL_QUEUE_NAME,true);
    }
    @Bean(name = "mailExchange")
    public DirectExchange mailExchange(){
        return new DirectExchange(MAIL_EXCHANGE_NAME,true,false);
    }
    //绑定队列到交换机声明使用的routingkey
/*    @Bean
    public Binding mailBinding(){
        Binding with = BindingBuilder.bind(mailQueue()).to(mailExchange()).with(MAIL_ROUTING_KEY_NAME);
        return BindingBuilder.bind(mailQueue()).to(mailExchange()).with(MAIL_ROUTING_KEY_NAME);
    }*/
    //绑定队列道交换机
    @Bean
    public Binding queueExchange(@Qualifier("mailQueue")Queue queue, @Qualifier("mailExchange")Exchange exchange){
        return BindingBuilder.bind(queue).to(exchange).with(MAIL_ROUTING_KEY_NAME).noargs();
    }

}

生产消息

    public ServerResponse send(Mail mail) {
        String msgId = RandomUtil.UUID32();
        mail.setMsgId(msgId);
        MsgLog msgLog = new MsgLog(msgId,mail,RabbitConfig.MAIL_EXCHANGE_NAME,RabbitConfig.MAIL_ROUTING_KEY_NAME);
        //消息入库
        msgLogMapper.insert(msgLog);
        //mq队列
        CorrelationData correlationData = new CorrelationData(msgId);
        rabbitTemplate.convertAndSend(RabbitConfig.MAIL_EXCHANGE_NAME,RabbitConfig.MAIL_ROUTING_KEY_NAME, MessageHelper.objToMsg(mail),correlationData);

        return ServerResponse.success(ResponseCode.MAIL_SEND_SUCCESS.getMsg());
    }

MailConsumer消费消息, 发送邮件

@Component
@Slf4j
public class SimpleMailConsumer {
    @Autowired
    private MsgLogService msgLogService;
    @Autowired
    private MailUtil mailUtil;

    @RabbitListener(queues = RabbitConfig.MAIL_QUEUE_NAME)
    public void consumer(Message message, Channel channel) throws IOException {
        Mail mail = MessageHelper.msgToObj(message, Mail.class);
        log.info("收到消息： {}",mail.toString());

        String msgId = mail.getMsgId();

        MsgLog msgLog = msgLogService.selectByMsgId(msgId);
        if (null ==msgLog || msgLog.getStatus().equals(Constant.MsgLogStatus.CONSUMED_SUCCESS)){
            log.info("重复消费，msgId: {}",msgId);
            return;
        }

        MessageProperties properties = message.getMessageProperties();
        long tag = properties.getDeliveryTag();

        boolean success = mailUtil.send(mail);
        if (success){
            msgLogService.updateStatus(msgId,Constant.MsgLogStatus.CONSUMED_SUCCESS);
            channel.basicAck(tag,false);//消费确认
        }else {
            //未被ack的消息(unacked)会重新入队并被消费, 这样就保证了消息不会走丢。
            channel.basicNack(tag,false,true);
        }
    }
}

原作者地址
注：抄别人的，自己只做个记录

本文地址：https://blog.csdn.net/weixin_43176399/article/details/107395495

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