spring cloud开发Greenwich版：消息服务（十七）

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本文利用spring cloud集成消息服务，建立消息生产者与消息消费者，与消息服务器通信

首先需要搭建rabbit消息服务器，这里作为测试，利用在线服务https://www.cloudamqp.com

然后建立消息生产者微服务cloud-stream-producer-rabbitmq

消息生产者微服务需要引入依赖spring-cloud-stream、spring-cloud-stream-binder-rabbit，其pom.xml文件如下；

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<?xml version="1.0" encoding="UTF-8"?>
<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 https://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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ralab</groupId>
    <artifactId>cloud-stream-producer-rabbitmq</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cloud-stream-producer-rabbitmq</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR3</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-rabbit</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.amqp</groupId>
            <artifactId>spring-rabbit-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-test-support</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

User消息类

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package com.ralab.cloudstreamproducerrabbitmq;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@JsonIgnoreProperties(ignoreUnknown = true)
public class User {
    private String userName;
    private String addr;
    private int age;

    public User(){}
    public User(String userName, String addr, int age) {
        this.userName = userName;
        this.addr = addr;
        this.age = age;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

ProducerController3消息生产类

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package com.ralab.cloudstreamproducerrabbitmq;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Source;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableBinding(Source.class)
public class ProducerController3 {

    @Autowired
    @Qualifier(Source.OUTPUT)
    private MessageChannel userChannel;

    @PostMapping("/produce")
    public void publish3(@RequestBody User user) {

        Message<User> msg = MessageBuilder.withPayload(user).build();
        this.userChannel.send(msg);
        //this.binding.greeting().send(msg);
    }
}

application.properties配置

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spring.rabbitmq.addresses=amqp://byqzaxwz:Tlrt32CSQYMHEeitFVUB43wkCSsiUlwo@hornet.rmq.cloudamqp.com/byqzaxwz
spring.cloud.stream.bindings.output.destination = user

server.port=8080

运行该应用CloudStreamProducerRabbitmqApplication

同时建立消息消费者微服务cloud-stream-consumer-rabbitmq，其pom.xml文件如下：

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<?xml version="1.0" encoding="UTF-8"?>
<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 https://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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ralab</groupId>
    <artifactId>cloud-stream-consumer-rabbitmq</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cloud-stream-consumer-rabbitmq</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR3</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-rabbit</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.amqp</groupId>
            <artifactId>spring-rabbit-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-test-support</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

同样需要添加User消息类，与消息生产者微服务相同
添加消息消费类UserListener

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package com.ralab.cloudstreamconsumerrabbitmq;

import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Sink;


@EnableBinding(Sink.class)
public class UserListener {

    @StreamListener(target = Sink.INPUT)
    public void processUserChannelGreeting(User user) {
        System.out.println(user.getUserName()+":"+user.getAddr()+":"+user.getAge());
    }
}

application.properties配置

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spring.rabbitmq.addresses=amqp://byqzaxwz:Tlrt32CSQYMHEeitFVUB43wkCSsiUlwo@hornet.rmq.cloudamqp.com/byqzaxwz
spring.cloud.stream.bindings.input.destination = user
server.port=9090

运行CloudStreamConsumerRabbitmqApplication
查看rabbitmq消息服务器

测试发送消息

然后就可以看到在消息消费者微服务的控制台输出消息

坚持原创技术分享，您的支持是我前进的动力！