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使用RabbitMQ异步执行业务

1.导入依赖

<!-- 引入RabbitMq依赖 -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

2.编写RabbitMQ配置文件

# rabbitmq配置
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=root
spring.rabbitmq.password=root
spring.rabbitmq.virtual-host=/handsomeforum
# 手动指定ack
spring.rabbitmq.listener.simple.acknowledge-mode=manual
# 开启confirm机制
spring.rabbitmq.publisher-confirm-type=simple
# 开启return机制
spring.rabbitmq.publisher-returns=true

3.编写RabbitMQ配置类

package com.handsome.rabbitmq;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/** * @Author Handsome * @Date 2022/7/4 10:12 * @Version 1.0 */
@SuppressWarnings({ 
   "all"})
	@Configuration
	public class RabbitMQConfig { 
   
	// 1.创建交换机
	@Bean
		public TopicExchange getTopicExchange() { 
   
		return new TopicExchange("handsomeforum-topic-exchange", true, false);
	}

	// 2.创建队列
	@Bean
		public Queue getQueue() { 
   
		return new Queue("handsomeforum-queue", true, false, false, null);
	}

	// 3.将交换机和队列绑定在一起
	@Bean
		public Binding getBinding() { 
   
		return BindingBuilder.bind(getQueue()).to(getTopicExchange()).with("handsomeforum.*");
	}

}

4.设置Return和Confirm机制

package com.handsome.rabbitmq;

import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

/** * @Author Handsome * @Date 2022/7/4 12:11 * @Version 1.0 */
@SuppressWarnings({ 
   "all"})
@Component
@Slf4j
public class PublisherConfirmAndReturnConfig implements RabbitTemplate.ConfirmCallback, RabbitTemplate.ReturnCallback { 
   
    @Autowired
    private RabbitTemplate rabbitTemplate;

    @PostConstruct
    private void initMethod() { 
   
        rabbitTemplate.setConfirmCallback(this);
        rabbitTemplate.setReturnCallback(this);
    }

    @Override
    public void confirm(CorrelationData correlationData, boolean ack, String cause) { 
   
        if (ack) { 
   
            log.info("消息已经送到Exchange中~");
        } else { 
   
            log.error("消息没有送到Exchange中~");
        }
    }

    @Override
    public void returnedMessage(Message message, int replyCode, String replyText, String exchange, String routingKey) { 
   
        log.error("消息没有送到Queue中~");
    }
}

5.将消息发送到交换机

// 发消息给mq异步更新文章浏览量
Map mqMap = new HashMap<>();
mqMap.put("bid", bid);
rabbitTemplate.convertAndSend("handsomeforum-topic-exchange",
"handsomeforum.readblog",
JSONObject.toJSONString(mqMap));

6.消费者消费消息

package com.handsome.rabbitmq;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.handsome.pojo.Blog;
import com.handsome.pojo.Question;
import com.handsome.pojo.UserLogin;
import com.handsome.service.BlogService;
import com.handsome.service.QuestionService;
import com.handsome.service.UserLoginService;
import com.handsome.service.VerifyMailboxService;
import com.handsome.utils.HandsomeUtils;
import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Component;

import javax.mail.internet.MimeMessage;
import java.io.IOException;

/** * @Author Handsome * @Date 2022/7/4 10:24 * @Version 1.0 */
@SuppressWarnings({ 
   "all"})
@Component
@Slf4j
public class Consumer { 
   

    // 配置文件中取值
    @Value(value = "${handsome.myMailbox}")
    private String myMailbox;

    @Autowired
    JavaMailSenderImpl mailSender;
    @Autowired
    VerifyMailboxService verifyMailboxService;

    @Autowired
    UserLoginService userLoginService;
    @Autowired
    BlogService blogService;
    @Autowired
    QuestionService questionService;

    // 自动ack
// @RabbitListener(queues = "handsomeforum-queue")
// public void getMessage(Object message) { 
   
// System.out.println("接收到的消息->" + message);
// }

    @RabbitListener(queues = "handsomeforum-queue")
    public void getMessage(@Payload String msg, Channel channel, Message message) throws IOException { 
   
        // 1.获取routingKey
        String routingKey = message.getMessageProperties().getReceivedRoutingKey();
        // 2.使用switch
        switch (routingKey) { 
   
            // 更新文章浏览量
            case "handsomeforum.readblog":
                JSONObject readblogObject = JSON.parseObject(msg);
                String bid = (String) readblogObject.get("bid");
                Blog blog = blogService.getOne(new QueryWrapper<Blog>().eq("bid", bid));
                blog.setViews(blog.getViews() + 1);
                // todo: redis缓存. 防止阅读重复
                blogService.updateById(blog);
                // 手动ack channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
                break;
        }
    }
}

7.RabbitMQ的作用

RabbitMQ即一个消息队列,主要是用来实现应用程序的异步和解耦,同时也能起到消息缓冲,消息分发的作用。
使用RabbitMQ实现异步更新文章浏览量，提升阅读文章时的响应速度。从直接更新数据库耗时450ms到异步更新数据库耗时50ms，明显提升接口性能，非常的nice~

RabbitMq忘记用户名和密码怎么办？

1.启动RabbitMq容器

2.进入RabbitMq容器

3.创建账号

rabbitmqctl add_user newadmin newpassword

4.设置用户角色

rabbitmqctl set_user_tags newadmin administrator

5.设置用户权限

rabbitmqctl set_permissions -p / newadmin "." "." ".*"

6.newadmin为新管理员账号 newpassword为密码 进行登录

7.登录成功

8.找回原用户名

9.更新root用户密码

10.用root用户登录

11.删除newadmin用户

12.成功找回root用户，非常非常的nice~

我的学习论坛

HandsomeForum:用Java编写的学习论坛，打造我们自己的圈子！(http://huangjunjie.vip:66)
文章链接(使用RabbitMQ异步执行业务):http://huangjunjie.vip:66/blog/read/66incxp18s5nfhqgwt
文章链接(RabbitMq忘记用户名和密码怎么办？):http://huangjunjie.vip:66/question/read/0y4jzhrj5ipdu86wd1