spring-cloud使用consul作为配置中心和注册中心

注意事项

启动类上需要设置@EnableScheduling注解配置才能自动刷新
启动类上需要设置@EnableConfigurationProperties({StudentConfig.class})
model类上设置@ConfigurationProperties(prefix = “student”) //前缀：对应consul 配置中心的 student 前缀
通过@Value注入的属性，修改consul的配置后，属性不能立即生效，需要服务重启。而通过@ConfigurationProperties注入的属性，修改consul的配置后，属性会立即生效，所以建议如果需要动态生效的配置，最好使用@ConfigurationProperties进行属性的注入。

consul可以作为配置中心和注册中心
pom.xml

<?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<&#47;modelVersion>
    <parent>
        <groupId>org.springframework.boot<&#47;groupId>
        <artifactId>spring-boot-starter-parent<&#47;artifactId>
        <version>2.2.4.RELEASE<&#47;version>
        <relativePath/> <!-- lookup parent from repository -->
    <&#47;parent>
    <groupId>com.guochen<&#47;groupId>
    <artifactId>consuldemo<&#47;artifactId>
    <version>0.0.1-SNAPSHOT<&#47;version>
    <name>consuldemo<&#47;name>
    <description>Demo project for Spring Boot<&#47;description>

    <properties>
        <java.version>1.8<&#47;java.version>
        <spring-cloud.version>Hoxton.SR1<&#47;spring-cloud.version>
    <&#47;properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot<&#47;groupId>
            <artifactId>spring-boot-starter-web<&#47;artifactId>
        <&#47;dependency>
        <dependency>
            <groupId>org.springframework.cloud<&#47;groupId>
            <artifactId>spring-cloud-starter-consul-config<&#47;artifactId>
        <&#47;dependency>
        <dependency>
            <groupId>org.springframework.cloud<&#47;groupId>
            <artifactId>spring-cloud-starter-consul-discovery<&#47;artifactId>
        <&#47;dependency>
        <dependency>
            <groupId>org.springframework.cloud<&#47;groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix<&#47;artifactId>
        <&#47;dependency> 
        <dependency>
            <groupId>org.springframework.boot<&#47;groupId>
            <artifactId>spring-boot-starter-actuator<&#47;artifactId>
        <&#47;dependency>
    <&#47;dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud<&#47;groupId>
                <artifactId>spring-cloud-dependencies<&#47;artifactId>
                <version>${spring-cloud.version}<&#47;version>
                <type>pom<&#47;type>
                <scope>import<&#47;scope>
            <&#47;dependency>
        <&#47;dependencies>
    <&#47;dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot<&#47;groupId>
                <artifactId>spring-boot-maven-plugin<&#47;artifactId>
            <&#47;plugin>
        <&#47;plugins>
    <&#47;build>

<&#47;project>

bootstrap.yml

spring:
  cloud:
    consul:
      host: localhost
      port: 8500
      #enabled将此值设置为“false”禁用Consul配置
      config:
        enabled: true   #默认是true --
        format: YAML    # 表示consul上面文件的格式 有四种 YAML PROPERTIES KEY-VALUE FILES
        data-key: data    #表示consul上面的KEY值(或者说文件的名字) 默认是data
        # watch选项为配置监视功能，主要监视配置的改变
        watch:
          enabled: true
          delay: 10000
          wait-time: 30

application.yml

spring:
  application:
    name: consul-service
  profiles:
    active: dev
  cloud:
    consul:
      # 服务发现配置
      discovery:
        # 启用服务发现
        enabled: true
        # 启用服务注册
        register: true
        # 服务停止时取消注册
        deregister: true
        # 表示注册时使用IP而不是hostname
        prefer-ip-address: true
        # 执行监控检查的频率
        health-check-interval: 30s
        # 设置健康检查失败多长时间后，取消注册
        health-check-critical-timeout: 30s
        # 健康检查的路径
        health-check-path: /actuator/info
        # 服务注册标识，格式为：应用名称+服务器IP+端口
        instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${server.port}

启动类

@SpringBootApplication
@EnableDiscoveryClient
@EnableScheduling  //启用后，会定时拉取配置
@EnableConfigurationProperties({StudentConfig.class})
public class ApplicationStart {
    public static void main(String[] args) {
        SpringApplication.run(ApplicationStart.class, args);
    }
}

model类

package io.guochen.consuldemo.model;
import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "student") //前缀：对应consul 配置中心的 student 前缀
public class StudentConfig {
    private String name;
    private int age;
    private String sex;


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

测试类

package io.guochen.consuldemo.controller;

import io.guochen.consuldemo.model.StudentConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {
    @Autowired
    private StudentConfig studentConfig;

    @Value("${test.name}")
    private  String testname;
    @RequestMapping("/test")
    public StudentConfig testDescription() {
       return studentConfig;
    }
}