java——spring boot集成RabbitMQ——高级特效——可靠性投递——spring boot实现return机制

标签：java String spring boot springframework import org public

交换机到队列的可靠性保证机制：

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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pom文件：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>springrmqtopicsender</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.5</version>
        <relativePath/>
    </parent>


    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

    </dependencies>

</project>

 

 

 

 

 

 

 

 

 

yml文件：

server:
  port: 8082
spring:
  rabbitmq:
    host: 127.0.0.1
    port: 5672
    username: guest
    password: guest
    publisher-confirm-type: correlated
    publisher-returns: true

 

 

 

 

 

 

 

回调配置文件：

package org.example.config;

import org.springframework.amqp.core.ReturnedMessage;
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;

@Component
public class MyConfirmCallback implements RabbitTemplate.ConfirmCallback,RabbitTemplate.ReturnsCallback {

    //把监听器注入到RabbitTemplate中
    @Autowired
    RabbitTemplate rabbitTemplate;


    @PostConstruct
    public void init()
    {
        rabbitTemplate.setConfirmCallback(this);
        rabbitTemplate.setReturnsCallback(this);

    }


    @Override
    public void confirm(CorrelationData correlationData, boolean ack, String cause) {


        /**
         *
         * 生产者发送消息给交换机；交换机返回ack的同时，还会带一些消息云数据，云数据从correlationData中获得
         *
         * correlationData中包括：
         *
         *     private volatile String id;
         *
         *     private volatile ReturnedMessage returnedMessage;
         *
         *     ============================================================================
         *
         *     ack是个布尔值。如果生产者发送一个消息到交换机，交换机签收成功，返回true。否则返回false；
         *
         *     ================================================================================
         *
         *     cause：原因。ack返回false时，返回的具体原因
         *
         */

        String id = correlationData.getId();

        if(ack)
        {
            //消息投递成功
            System.out.println("消息投递成功：" + id);
        }
        else {
            //失败。存入到缓存中，通过定时任务，定时发送
            System.out.println("消息投递失败，原因" + cause);
        }

    }

    @Override
    public void returnedMessage(ReturnedMessage returned) {
        /**
         * 当消息没有传递到队列的时候的回调方法：
         *
         *    private final Message message;
         *
         *     private final int replyCode;
         *
         *     private final String replyText;
         *
         *     private final String exchange;
         *
         *     private final String routingKey;
         *
         */

        System.out.println("消息" + returned.getMessage() + "没有成功投递到队列");
    }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

配置交换机：

package org.example.config;

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

/**
 * 主题交换机
 * topic策略可以根据routingKey的规则（通配符方式）进行去匹配队列进行转发规则为*.#.*
 */
@Configuration
public class RabbitTopicConfig
{


    public final static String TOPIC_NAME = "amqp-topic";


    @Bean
    TopicExchange topicExchange()
    {

        return new TopicExchange(TOPIC_NAME,true,false);

    }


}

 

 

 

 

 

 

发送消息：

package org.example.sender;

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 java.util.UUID;

/**
 * 消息生产者 发送消息
 */
@Component
public class MessageSender {

    @Autowired
    RabbitTemplate rabbitTemplate;

    /**
     * 发送消息
     * @param info
     */
    public void send(String info)
    {

        System.out.println("发送消息>>>"+info);

        CorrelationData correlationData = new CorrelationData();

        String uuid = UUID.randomUUID().toString();
        System.out.println(uuid);

        correlationData.setId(uuid);

        rabbitTemplate.convertAndSend("amqp-topic","ahuawei.a",info,correlationData);
    }

}

 

 

 

 

 

 

 

 

 

 

 

发送：

package org.example.controller;

import org.example.sender.MessageSender;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Auther: [email protected]
 * @Date: 2020/10/4 11:34
 */
@RestController
public class IndexController {

    @Autowired
    MessageSender messageSender;

    @RequestMapping("/index")
    public String index()
    {

        messageSender.send("中国——路由——华为");
        return "SUCCESS";
    }

}

 

 

 

 

 

 

 

 

 

 

 

启动服务：

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class HelloWorldApplication
{

    public static void main(String[] args)
    {

        SpringApplication.run(HelloWorldApplication.class, args);

    }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

标签：java,String,spring,boot,springframework,import,org,public
From： https://www.cnblogs.com/xiaobaibailongma/p/17156862.html