Spring Cloud 入門教程(七): 訊息匯流排(Spring Cloud Bus)(Greenwich.RELEASE)
阿新 • • 發佈：2019-06-26
參考網址：https://blog.csdn.net/forezp/article/details/81041062，由於此文中作者基於git和rabbitMq，為了適應內網我改造為基於mysql和kafka
一、準備工作
1、安裝kafka
參考這個：kafka在windows下的安裝（kafka_2.12-2.2.1）
2、安裝 mysql，建立資料庫及表結構（上一篇）
3、啟動之前的專案 erurekaserver
二、新建maven專案 config-server
1、修改pom.xml
<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>wg</groupId> <artifactId>config-server</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>config-server</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version> <java.version>1.8</java.version> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <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.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-bus-kafka</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-stream-kafka</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-bus</artifactId> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</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> </project>
2、新建ConfigServerApplication.java
package wg; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.config.server.EnableConfigServer; @SpringBootApplication @EnableConfigServer public class ConfigServerApplication { public static void main(String[] args) { SpringApplication.run(ConfigServerApplication.class, args); } }
3、新建application.properties
spring.application.name=config-server server.port=30000 spring.profiles.active=jdbc spring.datasource.url=jdbc:mysql://127.0.0.1:3306/wg?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8 spring.datasource.username=root spring.datasource.password=root spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver spring.cloud.config.label=master spring.cloud.config.server.jdbc=true spring.cloud.config.server.jdbc.sql=SELECT P_KEY, P_VALUE from CONFIG_PROPERTIES where APPLICATION=? and P_PROFILE=? and LABEL=? spring.cloud.bus.refresh.enabled=true spring.kafka.bootstrapServers=127.0.0.1:9092 spring.kafka.consumer.groupId:SpringCloud-bus eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/ management.endpoints.web.exposure.include=* management.security.enabled=false
4、啟動專案 訪問：http://localhost:8761/
三、修改之前的專案 eurekaclient1
1 、修改 bootstrap.yml （配置檔案只保留這一份）
server:
port: 8762
spring:
application:
name: eurekaclient
cloud:
config:
label: master
profile: dev
discovery:
enabled: true
service-id: config-server
bus:
refresh:
enabled: true
trace:
enabled: true
kafka:
bootstrap-servers: 127.0.0.1:9092
eureka:
instance:
instance-id: eurekaclient1
appname: ${spring.application.name}
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
management:
endpoints:
web:
exposure:
include: '*'
security:
enabled: false2、修改pom.xml
<?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>wg</groupId>
<artifactId>eurekaclient1</artifactId>
<version>1.0-SNAPSHOT</version>
<name>eurekaclient1</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
<java.version>1.8</java.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.1.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bus-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-stream-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-bus</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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>
3、修改EurekaClientApplication.java
package wg;
import org.springframework.beans.factory.annotation.Autowired;
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;
import wg.config.ServerConfig;
@SpringBootApplication
@RestController
public class EurekaClientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaClientApplication.class, args);
}
@Autowired
private ServerConfig serverConfig;
@Value("${server.port}")
String port;
@RequestMapping("/")
public String home() {
return "hello world from port " + port+",title:"+serverConfig.getTitle()+" name:"+serverConfig.getName()+" sex:"+serverConfig.getSex();
}
}
4、新建ServerConfig.java（位於EurekaClientApplication.java 下級包）
package wg.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties
@RefreshScope
public class ServerConfig {
private String title;
private String sex;
private String name;
public String getSex() {
return sex;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
5、啟動專案，訪問http://localhost:8762/
四、測試配置重新整理
1、開啟mysql客戶端，修改 name 的值並儲存，訪問 ：http://localhost:8762/ （會 發現配置 的name的值並未改變）
2、新建cmd視窗，執行 ： curl -v -X POST http://localhost:30000/actuator/bus-refresh，然後再次訪問：http://localhost:8762/ （會 發現配置 的name的值已經更新了）
