Spring Cloud應(yīng)用實現(xiàn)配置自動刷新過程詳解

更新時間：2019年12月31日 15:08:33 作者：指尖，寫不盡

這篇文章主要介紹了Spring Cloud應(yīng)用實現(xiàn)配置自動刷新過程詳解,文中通過示例代碼介紹的非常詳細，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,需要的朋友可以參考下

通過spring cloud 的消息總線，將配置github 等源代碼倉庫的變更通知到spring cloud 的所有組件。

spring-bus 需要用到rabbitmq ，所以需要提前準備rabbitmq消息隊列環(huán)境

配置中心調(diào)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: "*"

業(yè)務(wù)微服務(wù)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 不能使用默認，否則不能刷新
   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
 
#配置超時時間
feign:
 client:
  config:
   default:
    connectTimeout: 5000
    readTimeout: 5000
#    logger-level: bus

spring cloud bus 會使用 bus id 去匹配應(yīng)用，匹配上才會刷新配置

3.編寫測試代碼

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 類描述
 * @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 標記上才會被刷新配置

@RefreshScope 在Controller層使用，取不到值

利用githbu webhook 自動實現(xiàn)刷新配置:

Payload URL 需要添加config server 開放的monitor(monitor 為spring 自帶地址) ，如果在內(nèi)網(wǎng)，可以搜索內(nèi)網(wǎng)穿透工具配置
修改倉庫配置后，訪問地址:http://localhost:8081/config-demo/get-env 地址也會發(fā)生改變