SpringCloudBus:事件、消息總線,用于在叢集(例如,配置變化事件)中傳播狀态變化,可與Spring Cloud Config聯合實作熱部署。
在上一篇寫出了springcloud對微服務的集中配置,那麼就出現了一個問題,如果修改配置了怎麼實作不需重新開機服務來實作配置的更新,下面有集中解決方法。
1.使用/refresh手動重新整理配置
缺點:單點重新整理,如果叢集服務多的話,無論是工作量還是維護上都十分麻煩。
使用上一篇的config-client服務,加入依賴,
spring-boot-starter-actuator
pom檔案如下:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.dalaoyang</groupId>
<artifactId>springcloud_config_client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springcloud_config_client</name>
<description>springcloud_config_client</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Edgware.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
在Controller類上加入@RefreshScope注解,由于上一篇controller寫在了啟動類上,是以直接加在啟動類上,代碼如下:
package com.dalaoyang;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@RestController
@RefreshScope
public class SpringcloudConfigClientApplication {
public static void main(String[] args) {
SpringApplication.run(SpringcloudConfigClientApplication.class, args);
}
@Value("${title}")
String title;
@RequestMapping("/getTitle")
public String getTitle(){
return title;
}
}
配置檔案新增配置management.security.enabled=false,在重新整理時關閉安全驗證。
代碼如下:
spring.application.name=config-client
spring.cloud.config.label=master
spring.cloud.config.profile=test
spring.cloud.config.uri= http://localhost:9000/
##注冊中心位址
eureka.client.service-url.defaultZone=http://eureka.dalaoyang.cn/eureka/
## 重新整理時,關閉安全驗證
management.security.enabled=false
分别啟動項目config-server,config-client。通路
http://localhost:8080/getTitle,結果如下圖
image
修改git上配置,修改為dalaoyang_test_change,在次請求,結果沒有改變,使用postman或者其他工具post請求
看到傳回如下結果。
在次通路
,如下圖
2.使用springcloudbus重新整理配置
springcloudbus需要使用輕量消息代理,本文使用rabbitmq,啟動rabbitmq如下圖:
通路
http://localhost:15672/#/如下圖
建立項目springcloud_bus,同時改造config-client,pom檔案加入bus依賴,代碼如下:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.dalaoyang</groupId>
<artifactId>springcloud_bus</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springcloud_bus</name>
<description>springcloud_bus</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Edgware.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bus-amqp</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
加入rabbitmq配置,配置檔案如下:
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
##端口号
server.port=8881
## 重新整理時,關閉安全驗證
management.security.enabled=false
spring.application.name=config-client
spring.cloud.config.label=master
spring.cloud.config.profile=test
spring.cloud.config.uri= http://localhost:9000/
##注冊中心位址
eureka.client.service-url.defaultZone=http://eureka.dalaoyang.cn/eureka/
啟動類加入注解@RefreshScope,代碼如下:
package com.dalaoyang;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@RestController
@RefreshScope
public class SpringcloudBusApplication {
public static void main(String[] args) {
SpringApplication.run(SpringcloudBusApplication.class, args);
}
@Value("${title}")
String title;
@RequestMapping("/getTitle")
public String getTitle(){
return title;
}
}
config-client加入同樣依賴和配置,重新開機config-client,啟動springcloud_bus,先去
http://eureka.dalaoyang.cn/,可以看到
先将git上配置改回dalaoyang_test,分别請求
http://localhost:8881/getTitle和
結果如下:
然後用postman使用post請求通路
http://localhost:8881/bus/refresh再次分别請求
從圖中可以看出重新整理配置成功。
3.局部重新整理配置,配置與第2種方法一樣,隻是在使用postman重新整理時略加改變,在本文中使用
http://localhost:8881/bus/refresh?destination=config-client:8881可以重新整理服務名為config-client端口為8881的服務,如果想要重新整理服務名為config-client的所有服務可以寫成
http://localhost:8881/bus/refresh?destination=config-client:**源碼下載下傳 :
大老楊碼雲個人網站:
https://www.dalaoyang.cn