consul做配置中心

1. 分布式配置中心

consul不仅可做注册中心，还可做配置中心
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applicaiton.yml与bootstrap.yml:

applicaiton.yml是用户级的资源配置项
bootstrap.yml是系统级的，优先级更加高

Spring Cloud会创建一个“Bootstrap Context”，作为Spring应用的Application Context的父上下文。初始化的时候，Bootstrap Context负责从外部源加载配置属性并解析配置。这两个上下文共享一个从外部获取的Environment。

2. 添加依赖

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-consul-config</artifactId>
</dependency>
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>

3. 新增bootstrap.yml

spring:application:name: cloud-payment-service####Spring Cloud Consul for Service Discoverycloud:consul:host: localhostport: 8500discovery:service-name: ${spring.application.name}config:profile-separator: '-' # default value is ","，we update '-'format: YAML# config/cloud-payment-service/data
#       /cloud-payment-service-dev/data
#       /cloud-payment-service-prod/data

修改application.yml

server:port: 8001# ==========applicationName + druid-mysql8 driver===================
spring:
#  application:
#    name: cloud-payment-servicedatasource:type: com.alibaba.druid.pool.DruidDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/db2024?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8&rewriteBatchedStatements=true&allowPublicKeyRetrieval=trueusername: rootpassword: rootprofiles:active: dev  # 多环境配置加载内容dev/prod,不写就是默认default配置####Spring Cloud Consul for Service Discovery
#  cloud:
#    consul:
#      host: localhost
#      port: 8500
#      discovery:
#        service-name: ${spring.application.name}# ========================mybatis===================
mybatis:mapper-locations: classpath:mapper/*.xmltype-aliases-package: com.hong.entityconfiguration:map-underscore-to-camel-case: true

4. consul服务器k/v配置填写

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配置文件首层目录名必须为config,目录后面带/.官网默认分割方式为**,本文改为-**
最底层文件名必须为data,不带/

5. 测试获取consul中的配置

PayController中添加如下代码

    @Value("${server.port}")private String port;@GetMapping(value = "/pay/getConfigInfoByConsul")@Operation(summary = "测试查询consul配置信息",description = "测试查询consul配置信息")public String getConfigInfoByConsul(@Value("${payment8001.info}") String consulInfo){return "consulInfo: " + consulInfo +"\t"+ " port: " + port;}

启动后
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6. 动态刷新

主启动类上添加@RefreshScope注解

package com.hong;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import tk.mybatis.spring.annotation.MapperScan;/*** @author hong* @date 2020/1/14* @description 支付模块v1启动类*/
@SpringBootApplication
@MapperScan("com.hong.mapper")
@EnableDiscoveryClient
@RefreshScope
public class Main8001 {public static void main(String[] args) {SpringApplication.run(Main8001.class,args);}
}