11、Spring Cloud Config 配置热刷新
文章说明：该篇只是作为local环境跑起来，如果是线上，还需要考虑配置文件加密，链接kafka的账号和密码等问题...
1、前置条件：kafka 先跑起来（建议使用docker desktop，简单好用，何乐而不为？）
1.创建一个docker-compose.yml文件 （使用此docker配置需要添加hosts: 127.0.0.1 kafka.local, 127.0.0.1 zookkeeper.local）
version: '2'
services:
zookeeper:
image: "zookeeper"
hostname: "zookeeper.local"
container_name: "zookeeper"
设置网络别名
networks:
local:
aliases:
- "zookeeper.local"
kafka:
image: "wurstmeister/kafka"
hostname: "kafka.local"
container_name: "kafka"
ports:
- "9092:9092"
networks:
local:
aliases:
- "kafka.local"
environment:
KAFKA_ADVERTISED_HOST_NAME: kafka.local
KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
#设置网络，名为local
networks:
local:
driver: bridge
2.执行命令 docker-compose up -d (拉取镜像并运行)
3.第二部执行完之后，打开dockerdesktop 可以看到运行的镜像
4.进入kafka 的docker容器中，创建topic，并发送接受消息，测试kafka是否正常运行
- docker exec -it kafka /bin/bash
- kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic testDemo
- kafka-console-producer.sh --broker-list localhost:9092 --topic testDemo
- kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic testDemo
到这里可以看到，kafka正常运行！
2、建立git仓库（这里很简单，只附一张config结构图）
3、server 端配置
1.pom文件
<?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</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.firebit</groupId>
<artifactId>config-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>config-server</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>2021.0.1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bootstrap</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-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.application.yml
server:
port: 9999
logging:
level:
root: info
spring:
application:
name: config-server
cloud:
config:
server:
git:
uri: https://gitee.com/你自己的git/cloud-config-server.git
search-paths: /config/{application}/*,/*
default-label: develop
bus:
enabled: true
refresh:
enabled: true
ack:
enabled: true
trace:
enabled: true
kafka:
bootstrap-servers: localhost:9092
management:
endpoints:
web:
exposure:
include: '*'
3.启动类
@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApplication.class, args);
}
}
4、client 端配置
1.pom文件
<?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</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.6</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.firebit</groupId>
<artifactId>config-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>config-client</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>2021.0.1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bootstrap</artifactId>
<version>3.0.2</version>
</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-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</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>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.bootstrap.yml （profile这个变量是启动参数，自己给个dev，prod之类的就行）
spring:
profiles:
active: ${profile:test}
application:
name: config-client
cloud:
config:
fail-fast: true
uri: http://localhost:9999/
label: develop
bus:
enabled: true
refresh:
enabled: true
ack:
enabled: true
trace:
enabled: true
kafka:
bootstrap-servers: localhost:9092
management:
endpoints:
web:
exposure:
include: '*'
3.application.yml
spring:
profiles:
active: ${profile:test}
logging:
level:
root: info
hello: default
server:
port: 8080
fire:
name: li
age: 18
---
spring:
config:
activate:
on-profile: test
hello: test
server:
port: 8881
4.controller 测试类
@Slf4j
@RestController
public class TestController {
@Autowired
private EnvProperties envProperties;
@GetMapping("/test")
public String getConfig(){
return envProperties.getName();
}
}
5.refreshscope 注解类
@RefreshScope
@ConfigurationProperties(prefix = "fire")
@Component
@Data
public class EnvProperties {
private String name;
private Integer age;
}
6.启动类
@EnableConfigurationProperties
@SpringBootApplication
public class ConfigClientApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigClientApplication.class, args);
}
}
5、测试
1.访问localhost:8080/test（client 以profile=dev启动）
这是仓库的dev配置文件的配置，
接口响应是：
可见配置是正确拉取，
2.修改git仓库的prod配置文件，再次调用localhost:8080/test，会发现响应结果依然是：
prod-goodnight
因为此时并未有去做热刷新啊，这是符合预期的
3.接着去call server端的 refresh接口，localhost:9999/actuator/busrefresh
这个是没有响应内容的，只是返回200
4.再去调用localhost:8080/test，会发现响应内容是你刚刚修改的内容了，此时便是进行了配置的热刷新
5.测试完毕
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