Spring Cloud应用实现配置自动刷新过程详解

时间:2021-04-02 人气:3

这篇文章主要介绍了Spring Cloud应用实现配置自动刷新过程详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

通过spring cloud 的消息总线，将配置github 等源代码仓库的变更通知到spring cloud 的所有组件。

spring-bus 需要用到rabbitmq ，所以需要提前准备rabbitmq消息队列环境

配置中心调整

1.配置中心配置引用pom

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

<dependency>
　　<groupId>org.springframework.cloud</groupId>
　　<artifactId>spring-cloud-config-monitor</artifactId>
</dependency>

2. 配置中心配置

spring:
 application:
  name: spring-config
 cloud:
  config:
   server:
    git:
     uri: https://github.com/halouprogramer/spring-config-repository.git
#     username: ***
#     password: ***
     basedir: ~/temp/gitlab
 rabbitmq: #增加rabbitmq的配置
  host: 192.168.114.129
  port: 5672
  username: admin
  password: admin
eureka:
 client:
  service-url:
   defaultZone: http://localhost:8761/eureka/
 instance:
  prefer-ip-address: true
server:
 port: 3636
 
management:
 endpoints:
  web:
   exposure:
    include: "*"

业务微服务中需要做的修改

1.添加pom

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

2. 配置文件

spring:
 application:
  name: spring-school
 cloud:
  config:
   discovery:
    enabled: true
    service-id: SPRING-CONFIG
   profile: dev
  bus: #bus id 不能使用默认，否则不能刷新
   id: ${spring.application.name}:${spring.cloud.config.profile}:${random.value}
 profiles:
  active: dev
 rabbitmq:
  host: 192.168.114.129
  port: 5672
  username: admin
  password: admin
 
eureka:
 client:
  service-url:
   defaultZone: http://localhost:8761/eureka/
 instance:
  prefer-ip-address: true
 
#配置超时时间
feign:
 client:
  config:
   default:
    connectTimeout: 5000
    readTimeout: 5000
#    logger-level: bus

spring cloud bus 会使用 bus id 去匹配应用，匹配上才会刷新配置

3.编写测试代码

package com.lvlvstart.spring.demo.school.service;

import com.lvlvstart.spring.demo.school.dao.SchoolRepository;
import com.lvlvstart.spring.demo.school.entity.School;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Optional;

/**
 * @author zishu.lv@baodanyun-inc.com
 * @description 类描述
 * @create 2019/12/9 15:53
 */
@Service
@RefreshScope
public class SchoolService {


  @Value("${env}")
  private String env;

  @Autowired
  private SchoolRepository repository;


  public List<School> findAll(){
    return repository.findAll();
  }

  public School findById(String choolId){
    Optional<School> school = repository.findById(choolId);
    if(school.isPresent()){
      return school.get();
    }
    return null;
  }

  public String getEnv(){
    return env;
  }

}

package com.lvlvstart.spring.demo.school.web;


import com.lvlvstart.spring.demo.school.service.SchoolService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("config-demo")
public class ConfigDemoController {


  @Autowired
  private SchoolService schoolService;

  @GetMapping("get-env")
  private String getEnv(){
    return schoolService.getEnv();
  }
}

@RefreshScope 标记上才会被刷新配置

@RefreshScope 在Controller层使用，取不到值

利用githbu webhook 自动实现刷新配置:

Payload URL 需要添加config server 开放的monitor(monitor 为spring 自带地址) ，如果在内网，可以搜索内网穿透工具配置
修改仓库配置后，访问地址:http://localhost:8081/config-demo/get-env 地址也会发生改变

完整代码访问：https://github.com/halouprogramer/spring-cloud-demo

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