第二章 spring cloud config 配置 2.1.4版本

 

簡介

 

Spring Cloud Config爲分佈式系統中的外部化配置提供服務器和客戶端支持。使用配置服務器，您能夠在中心位置管理全部環境中應用程序的外部屬性。服務器存儲後端的默認實現使用git，所以它很容易支持配置環境的標記版本，而且能夠被用於管理內容的各類工具訪問。(以上摘自http://cloud.spring.io/spring-cloud-static/Edgware.SR3/single/spring-cloud.html#_spring_cloud_config);

Spring Cloud Config項目是一個解決分佈式系統的配置管理方案。它包含了Client和Server兩個部分，server提供配置文件的存儲、以接口的形式將配置文件的內容提供出去，client經過接口獲取數據、並依據此數據初始化本身的應用。這裏使用默認的git配置

 

spring cloud config server

 

https://start.spring.io/建立項目,取名spring-cloud-config-server-demo,這裏dependency選擇web,config server,actuator;如圖   

　　

 

　　　　

 

 

 

 

 

 

 

 

 

 

 

 

 

 

application.properties：　　　　　　

1 #application.properties配置Actuator,這裏能夠經過http://localhost:port/actuator/beans訪問當前application context中全部bean的信息 2 management.endpoints.web.exposure.include=beans 3 #若是但願放開多個權限,以逗號分隔 4 #management.endpoints.web.exposure.include=beans,env 5 #若是但願放開全部的權限 6 #management.endpoints.web.exposure.include=*

新建bootstrap.properties

1 spring.application.name=config-server 2 server.port=9090 3 #這裏使用了gitee的配置
4 spring.cloud.config.server.git.uri=https://git路徑/ 5 spring.cloud.config.server.git.search-paths=/ 6 spring.cloud.config.server.git.username=username 7 spring.cloud.config.server.git.password=password 8 #這裏是配置的本地目錄
9 #spring.cloud.config.server.git.uri = file:///F:/gitRepsitory

主程序入口

 1 import org.springframework.boot.SpringApplication;  2 import org.springframework.boot.autoconfigure.SpringBootApplication;  3 import org.springframework.cloud.config.server.EnableConfigServer;  4 
 5 @SpringBootApplication  6 @EnableConfigServer  7 public class SpringCloudConfigServerDemoApplication {  8 
 9     public static void main(String[] args) {    SpringApplication.run(SpringCloudConfigServerDemoApplication.class, args); 10  } 11 }

spring cloud config client

項目下載方式如上,不過config server換成config client,下載導入編輯器

application.properties：

1 management.endpoints.web.exposure.include=beans,env 2 server.port=8080 3 #舉個例子,jdbc:mysql://${database.ip}:3306/test,database.ip=localhost,這樣server中配置database.ip他會覆蓋當前的database.ip 4 my.name = shit

新建bootstrap.properties:

1 ### bootstrap 上下文配置 2 # 配置服務器 URI 3 spring.cloud.config.uri=http://localhost:9090/ 4 spring.cloud.config.name=spring-config-client 5 # profile 是激活配置 6 spring.profiles.active=prod 7 spring.cloud.config.profile=prod 8 # label 在Git中指的分支名稱 9 spring.cloud.config.label=master

主程序入口:

 1 package cn.cold.springcloudconfigclientdemo;  2 
 3 import org.springframework.boot.SpringApplication;  4 import org.springframework.boot.WebApplicationType;  5 import org.springframework.boot.autoconfigure.SpringBootApplication;  6 import org.springframework.cloud.bootstrap.config.PropertySourceLocator;  7 import org.springframework.cloud.context.refresh.ContextRefresher;  8 import org.springframework.context.annotation.Bean;  9 import org.springframework.context.annotation.Configuration; 10 import org.springframework.core.Ordered; 11 import org.springframework.core.annotation.Order; 12 import org.springframework.core.env.Environment; 13 import org.springframework.core.env.MapPropertySource; 14 import org.springframework.core.env.PropertySource; 15 import org.springframework.scheduling.annotation.EnableScheduling; 16 import org.springframework.scheduling.annotation.Scheduled; 17 
18 import java.util.HashMap; 19 import java.util.Map; 20 import java.util.Set; 21 
22 @SpringBootApplication 23 @EnableScheduling 24 public class SpringCloudConfigClientDemoApplication { 25 
26     public static void main(String[] args) { 27         SpringApplication application = new SpringApplication(SpringCloudConfigClientDemoApplication.class); 28  application.setWebApplicationType(WebApplicationType.SERVLET); 29  application.run(args); 30  } 31 
32     private final ContextRefresher contextRefresher; 33 
34     private final Environment environment; 35 
36     public SpringCloudConfigClientDemoApplication(ContextRefresher contextRefresher, 37  Environment environment) { 38         this.contextRefresher = contextRefresher; 39         this.environment = environment; 40  } 41 
42     /**
43  * 這裏設置定時刷新獲取當前配置,否則只能經過重啓刷新配置 44      */
45     @Scheduled(fixedRate = 5 * 1000, initialDelay = 3 * 1000) 46     public void autoRefresh() { 47         Set<String> updatedPropertyNames = contextRefresher.refresh(); 48         updatedPropertyNames.forEach(propertyName ->
49                 System.err.printf("[Thread :%s] 當前配置已更新，具體 Key：%s , Value : %s \n", 50  Thread.currentThread().getName(), 51  propertyName, 52  environment.getProperty(propertyName) 53  )); 54  } 55 }

新建controller,好比咱們取名爲FuckController:

package cn.cold.springcloudconfigclientdemo.controller; 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.RestController; /* * @create 2019-05-05 19:36 * @Author 江湖人稱洗髮水 * @Description //TODO **/ @RestController @RefreshScope //這裏是刷新my.name這個屬性值
public class FuckController { @Value("${my.name}") private String myName; @GetMapping("/my-name") public String getName(){ return myName; } }

Gitee

這裏上傳git配置文件有四個,能夠在裏面輸入不一樣的值

 

啓動

兩個項目啓動,這裏訪問http://localhost:8080/my-name會返回,git中的配置文件的值那就表明獲取到了;而後能夠進一步http://localhost:8080/actuator/env查看spring.cloud.config.uri:這裏就是config server 的地址;

經過http://localhost:8080/actuator/env查看當前配置文件信息如圖

 

Env:參考EnvironmentEndpoint類

 Environment關聯多個帶名稱的PropertySources

參考spring 源碼 AbstractRefreshableWebApplicationContext

1 protected void initPropertySources() { 2   ConfigurableEnvironment env = getEnvironment(); 3   if (env instanceof ConfigurableWebEnvironment) { 4     ((ConfigurableWebEnvironment) env).initPropertySources(this.servletContext, this.servletConfig); 5  } 6 }

Environment 有兩種實現方式：

普通類型：StandardEnvironment

Web類型：StandardServletEnvironment

Enviroment 關聯着一個PropertySources 實例

PropertySources 關聯着多個PropertySource，而且有優先級,這裏能夠經過url http://localhost:8080/actuator/env看到

關於 Spring Boot 優先級順序，能夠參考：https://docs.spring.io/spring-boot/docs/2.0.0.BUILD-SNAPSHOT/reference/htmlsingle/#boot-features-external-config

 

其餘

當咱們但願本身的配置不被修改,能夠用spi來加載,例如my.name這裏我就想指定爲wuyanzu,能夠添加如下代碼

 1 @Configuration  2 @Order(Ordered.HIGHEST_PRECEDENCE + 100)  3 public static class CustomizePropertySourceLocator implements PropertySourceLocator {  4 
 5 　　@Override  6    public PropertySource<?> locate(Environment environment) {  7    　　Map<String, Object> source = new HashMap<>();  8       source.put("my.name", "8081");  9       MapPropertySource propertySource =
10                     new MapPropertySource("my-property-source", source); 11       return propertySource; 12  } 13 }