Consul官网：https://www.consul.io/
Consul简介：
Consul 是一套开源的分布式服务发现和配置管理系统，由 HashiCorp 公司 用 Go 语言开发。
它提供了微服务系统中的 服务治理、配置中心、控制总线等功能。这些功能中的每一个都可以根据需要单独使用，也可以一起使用以构建全方位的服务网格，总之Consul 提供了一种完整的服务网格解决方案。
它具有很多优点。包括：基于raft 协议，比较简洁；支持健康检查，同时支持HTTP和DNS协议，支持跨数据中心的WAN集群，提供图形界面，跨平台，支持Linux、Mac、Windows。
下载地址：https://www.consul.io/downloads
中文文档地址：https://www.springcloud.cc/spring-cloud-consul.html
下载完成后只有一个 consul.exe文件，可以在当前路径下用cmd控制台查看版本信息、启动
以开发模式启动：consul agent -dev
访问：http://localhost:8500
Consul的使用：
核心步骤：
1. POM引入依赖。
<dependency> <groupId>org.springframework.cloudgroupId> <artifactId>spring-cloud-starter-consul-discoveryartifactId> dependency>
2. YML配置。
spring:
application:
name: cloud-payment-service
cloud:
consul:
host: localhost
port: 8500
discovery:
service-name: ${spring.application.name}
3. 启动类添加注解。
@EnableDiscoveryClient
示例：
新建支付服务： cloud-providerconsul-payment8006
POM：
xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>yct-cloud-parentartifactId>
<groupId>com.yct.springcloudgroupId>
<version>1.0-SNAPSHOTversion>
parent>
<modelVersion>4.0.0modelVersion>
<artifactId>cloud-providerconsul-payment8006artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-consul-discoveryartifactId>
dependency>
<dependency>
<groupId>com.yct.springcloudgroupId>
<artifactId>cloud-base-mybatisplusartifactId>
<version>${project.version}version>
dependency>
<dependency>
<groupId>com.yct.springcloudgroupId>
<artifactId>cloud-base-apiartifactId>
<version>${project.version}version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-actuatorartifactId>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-typehandlers-jsr310artifactId>
<version>1.0.2version>
dependency>
<dependency>
<groupId>com.baomidougroupId>
<artifactId>mybatis-plus-boot-starterartifactId>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druid-spring-boot-starterartifactId>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
dependency>
<dependency>
<groupId>com.baomidougroupId>
<artifactId>mybatis-plus-boot-starterartifactId>
dependency>
<dependency>
<groupId>com.baomidougroupId>
<artifactId>mybatis-plus-generatorartifactId>
dependency>
<dependency>
<groupId>org.apache.velocitygroupId>
<artifactId>velocity-engine-coreartifactId>
<version>2.2version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jdbcartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
<scope>runtimescope>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
project>
YML：
server: port: 8006 spring: application: name: cloud-payment-service datasource: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: org.gjt.mm.mysql.Driver url: jdbc:mysql://localhost:3306/cloud2020?useUnicode=true&characterEncoding=utf-8&useSSL=false username: root password: 123456 cloud: consul: host: localhost port: 8500 discovery: service-name: ${spring.application.name} mybatis-plus: configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #开启sql日志 mapper-locations: classpath:mapper/*.xml type-aliases-package: com.yct.springcloud.entity.*
主启动类：
package com.yct.springcloud; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; @SpringBootApplication @MapperScan("com.yct.springcloud.mapper") @EnableDiscoveryClient public class ProviderPaymentApplication8006 { public static void main(String[] args) { SpringApplication.run(ProviderPaymentApplication8006.class,args); } }
从其他支付微服务（例如：cloud-provider-payment8002 项目）项目复制其他所有代码，修改controller中的访问路径（加个/consul 表示是Consul的服务），其他都不用改。
测试：
新建消费者 订单服务：cloud-consumerconsul-order8081
POM：
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">
<parent>
<artifactId>yct-cloud-parentartifactId>
<groupId>com.yct.springcloudgroupId>
<version>1.0-SNAPSHOTversion>
parent>
<modelVersion>4.0.0modelVersion>
<artifactId>cloud-consumerconsul-order8081artifactId>
<dependencies>
<dependency>
<groupId>com.yct.springcloudgroupId>
<artifactId>cloud-base-apiartifactId>
<version>1.0-SNAPSHOTversion>
<scope>compilescope>
dependency>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-consul-discoveryartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-actuatorartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
<scope>runtimescope>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
project>
YML：
server:
port: 8081
spring:
application:
name: consul-order-service
cloud:
consul:
host: localhost
port: 8500
discovery:
service-name: ${spring.application.name}
配置Bean：
package com.yct.springcloud.config; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.client.RestTemplate; @Configuration public class ApplicationContextConfig { @Bean @LoadBalanced public RestTemplate getRestTemplate(){ return new RestTemplate(); } }
Controller：
package com.yct.springcloud.controller; import com.yct.springcloud.entity.pay.Payment; import com.yct.springcloud.support.CommonResult; import lombok.extern.slf4j.Slf4j; import org.springframework.web.bind.annotation.*; import org.springframework.web.client.RestTemplate; import javax.annotation.Resource; import java.awt.*; /** * 订单Controller */ @RestController @Slf4j public class OrderController { public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE"; @Resource private RestTemplate restTemplate; @PostMapping("/consumer/payment/consul/create") public CommonResultcreate(Payment payment) { log.info("Consumer：插入支付【" + payment + "】"); return restTemplate.postForObject(PAYMENT_URL + "/yct/payment/consul/insertPayment", payment, CommonResult.class); //写操作 } @GetMapping(value = "/consumer/payment/consul/get/{id}"/*,produces = { "application/json;charset=UTF-8" }*/) public CommonResult getPayment(@PathVariable("id") Long id) { log.info("Consumer：根据id【" + id + "】查询支付数据。"); return restTemplate.getForObject(PAYMENT_URL + "/yct/payment/consul/get/" + id, CommonResult.class); } }
主启动类：
package com.yct.springcloud; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; @SpringBootApplication @EnableDiscoveryClient public class CustomerOrderApplication8081 { public static void main(String[] args) { SpringApplication.run(CustomerOrderApplication8081.class,args); } }
两个订单服务的结构也是一样的，只是当前订单服务注册进了Consul。之前的注册进了Eureka。
测试：
