企业买好域名后怎么做网站,wordpress需要调用缩略图,做类似淘宝的网站开发需要什么,阿里邮箱 网站开发1.RabbitMQ延时队列
延迟队列存储的对象是对应的延迟消息#xff0c;所谓“延迟消息”是指当消息被发送以后#xff0c;并不想让消费者立刻拿到消息#xff0c;而是等待特定时间后#xff0c;消费者才能拿到这个消息进行消费 注意RabbitMQ并没有延时队列慨念,…1.RabbitMQ延时队列
延迟队列存储的对象是对应的延迟消息所谓“延迟消息”是指当消息被发送以后并不想让消费者立刻拿到消息而是等待特定时间后消费者才能拿到这个消息进行消费 注意RabbitMQ并没有延时队列慨念,其实是通过死信实现 应用场景:订单30分钟未支付取消…
2.整合springboot
创建springboot Maven项目,其pom文件内容如下:
?xml version1.0 encodingUTF-8?
project xmlnshttp://maven.apache.org/POM/4.0.0 xmlns:xsihttp://www.w3.org/2001/XMLSchema-instancexsi:schemaLocationhttp://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsdmodelVersion4.0.0/modelVersionparentgroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-parent/artifactIdversion2.4.2/versionrelativePath/ !-- lookup parent from repository --/parentgroupIdcom.hong/groupIdartifactIdspringboot-rabbitmq/artifactIdversion0.0.1-SNAPSHOT/versionnamespringboot-rabbitmq/namedescriptionspringboot整合Rabbitmq/descriptionpropertiesjava.version17/java.version/propertiesdependenciesdependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter/artifactId/dependency!--RabbitMQ 依赖--dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-amqp/artifactId/dependencydependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-web/artifactId/dependencydependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-test/artifactIdscopetest/scope/dependencydependencygroupIdcom.alibaba/groupIdartifactIdfastjson/artifactIdversion1.2.47/version/dependencydependencygroupIdorg.projectlombok/groupIdartifactIdlombok/artifactIdversion1.18.24/version/dependency!--swagger--dependencygroupIdio.springfox/groupIdartifactIdspringfox-swagger2/artifactIdversion3.0.0/version/dependencydependencygroupIdio.springfox/groupIdartifactIdspringfox-swagger-ui/artifactIdversion3.0.0/version/dependency!--RabbitMQ 测试依赖--dependencygroupIdorg.springframework.amqp/groupIdartifactIdspring-rabbit-test/artifactIdscopetest/scope/dependency/dependenciesbuildpluginsplugingroupIdorg.springframework.boot/groupIdartifactIdspring-boot-maven-plugin/artifactIdversion2.4.2/version/plugin/plugins/build/project3.配置文件application.properties
spring.rabbitmq.host10.211.55.4
spring.rabbitmq.port5672
spring.rabbitmq.usernameadmin
spring.rabbitmq.password1234564.添加Swagger配置类
package com.hong.springboot.rabbitmq.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;/*** Description: Swagger配置类* Author: hong* Date: 2024-01-24 10:38* Version: 1.0**/
Configuration
EnableSwagger2
public class SwaggerConfig {Beanpublic Docket webApiConfig() {return new Docket(DocumentationType.SWAGGER_2).groupName(webApi).apiInfo(webApiInfo()).select().build();}private ApiInfo webApiInfo() {return new ApiInfoBuilder().title(rabbitmq接口文档).description(本文档描述了 rabbitmq 微服务接口定义).version(1.0).contact(new Contact(JAVA小生不才, https://blog.csdn.net/qq_41596346?spm1011.2423.3001.5343, hst1406959716163.com)).build();}
}5.队列TTL配置列 package com.hong.springboot.rabbitmq.config;import org.springframework.amqp.core.*;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import java.util.HashMap;
import java.util.Map;/*** Description: TTL队列配置类* Author: hong* Date: 2024-01-24 09:57* Version: 1.0**/Configuration
public class TTLQueeueConfig {public static final String X_EXCHANGE X;public static final String QUEUE_A QUEUE_A;public static final String QUEUE_B QUEUE_B;//死信交换机public static final String Y_DEAD_LETTER_EXCHANGE Y;//死信队列public static final String DEAD_LETTER_QUEUE QD;// 声明 xExchangeBean(xExchange)public DirectExchange xExchange() {return new DirectExchange(X_EXCHANGE);}// 声明 死信队列交换机Bean(yExchange)public DirectExchange yExchange() {return new DirectExchange(Y_DEAD_LETTER_EXCHANGE);}//声明队列 A ttl 为 10s 并绑定到对应的死信交换机Bean(queueA)public Queue queueA() {MapString, Object args new HashMap(3);//声明当前队列绑定的死信交换机args.put(x-dead-letter-exchange, Y_DEAD_LETTER_EXCHANGE);//声明当前队列的死信路由 keyargs.put(x-dead-letter-routing-key, YD);//声明队列的 TTLargs.put(x-message-ttl, 10000);return QueueBuilder.durable(QUEUE_A).withArguments(args).build();}// 声明队列 A 绑定 X 交换机Beanpublic Binding queueaBindingX(Qualifier(queueA) Queue queueA,Qualifier(xExchange) DirectExchange xExchange) {return BindingBuilder.bind(queueA).to(xExchange).with(XA);}//声明队列 B ttl 为 40s 并绑定到对应的死信交换机Bean(queueB)public Queue queueB() {MapString, Object args new HashMap(3);//声明当前队列绑定的死信交换机args.put(x-dead-letter-exchange, Y_DEAD_LETTER_EXCHANGE);//声明当前队列的死信路由 keyargs.put(x-dead-letter-routing-key, YD);//声明队列的 TTLargs.put(x-message-ttl, 40000);return QueueBuilder.durable(QUEUE_B).withArguments(args).build();}//声明死信队列 QDBean(queueD)public Queue queueD() {return new Queue(DEAD_LETTER_QUEUE);}//声明队列 B 绑定 X 交换机Beanpublic Binding queuebBindingX(Qualifier(queueB) Queue queueB,Qualifier(xExchange) DirectExchange xExchange) {return BindingBuilder.bind(queueB).to(xExchange).with(XB);}//声明死信队列 QD 绑定关系Beanpublic Binding deadLetterBindingQAD(Qualifier(queueD) Queue queueD,Qualifier(yExchange) DirectExchange yExchange) {return BindingBuilder.bind(queueD).to(yExchange).with(YD);}
}6.消息生产者
package com.hong.springboot.rabbitmq.controller;import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.text.SimpleDateFormat;
import java.util.Date;/*** Description: 消息生产者* Author: hong* Date: 2024-01-28 10:15* Version: 1.0**/
Slf4j
RequestMapping(ttl)
RestController
public class SendMessageController {Autowiredprivate RabbitTemplate rabbitTemplate;GetMapping(sendMsg/{message})public void sendMsg(PathVariable String message) {log.info(当前时间{},发送一条信息给两个 TTL 队列:{},new SimpleDateFormat(yyyy-MM-dd HH:mm:ss).format(new Date()) , message);rabbitTemplate.convertAndSend(X, XA, 消息来自ttl为10S的QA队列: message);rabbitTemplate.convertAndSend(X, XB, 消息来自ttl为10S的QB队列: message);}
}7.消息消费者代码
package com.hong.springboot.rabbitmq.consumer;import com.hong.springboot.rabbitmq.config.TTLQueeueConfig;
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.stereotype.Component;import java.text.SimpleDateFormat;
import java.util.Date;/*** Description: 死信消费者* Author: hong* Date: 2024-01-28 10:22* Version: 1.0**/
Slf4j
Component
public class DeadLetterQueueConsumer {RabbitListener(queues QD)public void receiveD(Message message, Channel channel) {String msg new String(message.getBody());log.info(当前时间{},收到死信队列信息{},new SimpleDateFormat(yyyy-MM-dd HH:mm:ss).format(new Date()) , msg);}}启动项目发起http://localhost:8080/ttl/sendMsg/JAVA%E5%B0%8F%E7%94%9F%E4%B8%8D%E6%89%8D请求
8.代码优化
QA和QB的ttl都写死啦若是再来1个时间不同的咋处理
8.1.TTLQueeueConfig优化
代码中添加如下代码 //QC 不设置ttl 消息自带ttlpublic static final String QUEUE_C QC;//声明队列 C 死信交换机 Bean(queueC)public Queue queueC() {MapString, Object args new HashMap(3);//声明当前队列绑定的死信交换机args.put(x-dead-letter-exchange, Y_DEAD_LETTER_EXCHANGE);//声明当前队列的死信路由 keyargs.put(x-dead-letter-routing-key, YD);//没有声明 TTL 属性return QueueBuilder.durable(QUEUE_C).withArguments(args).build();}//声明队列C绑定 X 交换机Beanpublic Binding queueCBindingX(Qualifier(queueC) Queue queueC,Qualifier(xExchange) DirectExchange xExchange) {return BindingBuilder.bind(queueC).to(xExchange).with(XC);}8.2.生产者代码优化
添加如下方法 /*** 延时队列优化* param message 消息* param ttlTime 延时的毫秒*/GetMapping(sendExpirationMsg/{message}/{ttlTime})public void sendMsg(PathVariable String message, PathVariable String ttlTime) {rabbitTemplate.convertAndSend(X, XC, message, correlationData - {correlationData.getMessageProperties().setExpiration(ttlTime);return correlationData;});log.info(当前时间{},发送一条时长{}毫秒TTL信息给队列C:{}, new SimpleDateFormat(yyyy-MM-dd HH:mm:ss).format(new Date()) , ttlTime, message);}
