前言
本章講解RabbitMQ的交換器之Topic
方法
1.概念
topic(主題,規則匹配),該類型交換器主要根據路由鍵進行模糊匹配
需求:在我們的普通訂單和VIP訂單的業務邏輯中,會產生相關的日誌。我們知道,日誌是分級別的,這裏我們僅僅採集INFO、ERROR級別的日誌。如果按照Direct交換器的處理規則,我們需要創建四個隊列來處理,即普通訂單的INFO日誌、普通訂單的ERROR日誌、VIP訂單的INFO日誌、VIP訂單的ERROR日誌,這裏我們認爲沒有必要,完全可以分爲兩類,即INFO日誌和ERROR日誌的隊列分別的進行處理。由此,我們將使用模糊匹配的規則,即Topic交換器
2.環境搭建
1)創建Provider和Consumer工程
2)修改pom文件
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
</parent>
<groupId>cn.edu.ccut</groupId>
<artifactId>rabbitmq-topic-provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<!-- 設定Java的版本 -->
<java.version>1.8</java.version>
<!-- 解決pom.xml首行報錯 -->
<maven-jar-plugin.version>3.1.0</maven-jar-plugin.version>
</properties>
<dependencies>
<!-- 配置springBoot的web啓動器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 配置rabbitmq的啓動器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
<!-- 配置devtools -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<!-- 配置springBoot的test啓動器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>cn.edu.ccut.App</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
3)修改application.properties
Provider:
spring.application.name=springboot-rabbitmq
#rabbitmq config
spring.rabbitmq.host=192.168.1.108
spring.rabbitmq.port=5672
spring.rabbitmq.username=jwang
spring.rabbitmq.password=123456
#exchange config
mq.config.exchange=log.topic
Consumer:
spring.application.name=springboot-rabbitmq
#rabbitmq config
spring.rabbitmq.host=192.168.1.108
spring.rabbitmq.port=5672
spring.rabbitmq.username=jwang
spring.rabbitmq.password=123456
#exchange config
mq.config.exchange=log.topic
mq.config.queue.info=log.info
mq.config.queue.error=log.error
2.編寫Provider
創建兩個Provider類,GeneralProvider和VipProvider
GeneralProvider:
package cn.edu.ccut;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class GeneralProvider {
@Autowired
private AmqpTemplate rabbitTemplate;
@Value("${mq.config.exchange}")
private String exchange;
public void sendMsg(String msg){
//發送普通訂單的日誌消息
rabbitTemplate.convertAndSend(exchange, "general.log.info", "general...info..."+msg);
rabbitTemplate.convertAndSend(exchange, "general.log.error", "general...error..."+msg);
}
}
VipProvider:
package cn.edu.ccut;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class VipProvider {
@Autowired
private AmqpTemplate rabbitTemplate;
@Value("${mq.config.exchange}")
private String exchange;
public void sendMsg(String msg){
//發送普通訂單的日誌消息
rabbitTemplate.convertAndSend(exchange, "vip.log.info", "vip...info..."+msg);
rabbitTemplate.convertAndSend(exchange, "vip.log.error", "vip...error..."+msg);
}
}
3.編寫Consumer代碼
創建兩個Consumer類,ErrorConsumer和InfoConsumer來分別處理兩個級別的日誌
ErrorConsumer:
路由鍵採用的是模糊匹配的方式:*.log.error
package cn.edu.ccut;
import org.springframework.amqp.core.ExchangeTypes;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
@RabbitListener(bindings=
@QueueBinding(
value=@Queue(name="${mq.config.queue.error}",autoDelete="true"),
exchange=@Exchange(name="${mq.config.exchange}",type=ExchangeTypes.TOPIC),
key="*.log.error"
)
)
public class ErrorConsumer {
@RabbitHandler
public void receiveMsg(String msg){
System.out.println("Vip Message is "+msg);
}
}
InfoConsumer:
路由鍵採用的是模糊匹配的方式:*.log.info
package cn.edu.ccut;
import org.springframework.amqp.core.ExchangeTypes;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
@RabbitListener(bindings=
@QueueBinding(
value=@Queue(name="${mq.config.queue.info}",autoDelete="true"),
exchange=@Exchange(name="${mq.config.exchange}",type=ExchangeTypes.TOPIC),
key="*.log.info"
)
)
public class InfoConsumer {
@RabbitHandler
public void receiveMsg(String msg){
System.out.println("Info Message is "+msg);
}
}
4.編寫測試類進行測試
package cn.edu.ccut;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest(classes=App.class)
public class RabbitMQTest {
@Autowired
private GeneralProvider generalProvider;
@Autowired
private VipProvider vipProvider;
@Test
public void testSendMsg() throws Exception{
generalProvider.sendMsg("general message !");
vipProvider.sendMsg("vip message !");
}
}
啓動Consumer,然後運行Provider測試代碼,我們會在控制檯發現如下結果:
這說明,我們的測試完全的成功。