Spring Cloud Learning(一): 服务注册
2024-08-30 00:05:27
官网https://projects.spring.io/spring-cloud/，spring cloud官网各组件版本为：
| Component | Edgware.SR4 | Finchley.SR1 | Finchley.BUILD-SNAPSHOT |
|---|---|---|---|
| spring-cloud-aws | 1.2.3.RELEASE | 2.0.0.RELEASE | 2.0.1.BUILD-SNAPSHOT |
| spring-cloud-bus | 1.3.3.RELEASE | 2.0.0.RELEASE | 2.0.1.BUILD-SNAPSHOT |
| spring-cloud-cli | 1.4.1.RELEASE | 2.0.0.RELEASE | 2.0.1.BUILD-SNAPSHOT |
| spring-cloud-commons | 1.3.4.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-contract | 1.2.5.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-config | 1.4.4.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-netflix | 1.4.5.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-security | 1.2.3.RELEASE | 2.0.0.RELEASE | 2.0.1.BUILD-SNAPSHOT |
| spring-cloud-cloudfoundry | 1.1.2.RELEASE | 2.0.0.RELEASE | 2.0.1.BUILD-SNAPSHOT |
| spring-cloud-consul | 1.3.4.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-sleuth | 1.3.4.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-stream | Ditmars.SR4 | Elmhurst.SR1 | Elmhurst.BUILD-SNAPSHOT |
| spring-cloud-zookeeper | 1.2.2.RELEASE | 2.0.0.RELEASE | 2.0.1.BUILD-SNAPSHOT |
| spring-boot | 1.5.14.RELEASE | 2.0.4.RELEASE | 2.0.4.BUILD-SNAPSHOT |
| spring-cloud-task | 1.2.3.RELEASE | 2.0.0.RELEASE | 2.0.1.BUILD-SNAPSHOT |
| spring-cloud-vault | 1.1.1.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-gateway | 1.0.2.RELEASE | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT |
| spring-cloud-openfeign | 2.0.1.RELEASE | 2.0.2.BUILD-SNAPSHOT | |
| spring-cloud-function | 1.0.0.RELEASE | 1.0.0.RELEASE | 1.0.1.BUILD-SNAPSHOT |
其中，在使用spring cloud时，需注意spring boot版本，Finchley构建并使用Spring Boot 2.0.x，预计不会与Spring Boot 1.5.x一起使用。
注意：Dalston发布将于2018年12月达到使用寿命.Eginware将遵循Spring Boot 1.5.x的生命周期结束周期。
Dalston和Edgware发布版基于Spring Boot 1.5.x构建，预计不会与Spring Boot 2.0.x一起使用。
一、注册与发现
Spring Cloud使用eureka, 所有需要访问配置文件的应用都作为一个erureka client注册上去。eureka是一个高可用的组件，它没有后端缓存，每一个实例注册之后需要向注册中心发送请求，在默认情况下erureka server也是一个eureka client ,必须要指定一个 server。
maven依赖如下：
<?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.chm</groupId>
<artifactId>springcloud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> <name>springcloud</name>
<description>Spring cloud eureka server project module</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.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>Finchley.SR1</spring-cloud.version>
</properties> <dependencies>
<!--eureka server -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<!--<artifactId>spring-cloud-starter-eureka-server</artifactId>-->
<artifactId>spring-cloud-starter-netflix-eureka-server</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-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build> <!-- 使用里程碑版需要下面的配置（Spring官网上的配置更为简洁，
更适合每个版本 http://projects.spring.io/spring-boot/）。新版本新特性，如开发热部署 -->
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories> </project>
启动类为：
@EnableEurekaServer
@SpringBootApplication
public class SpringcloudEurekaServerApplication { public static void main(String[] args) {
SpringApplication.run(SpringcloudEurekaServerApplication.class, args);
}
}
配置文件为：
server:
port: 9999
eureka:
instance:
hostname: 127.0.0.1
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
结果报异常为：java.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yml'，需严格注意yml文件格式。
启动eureka server，然后访问http://localhost:9999，可看到Eureka启动界面。
客户端
maven依赖如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <groupId>com.chm</groupId>
<artifactId>springcloud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> <name>springcloud</name>
<description>Spring cloud eureka client project module</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent> <properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.SR1</spring-cloud.version>
</properties> <dependencies>
<!--eureka server -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<!--<artifactId>spring-cloud-starter-eureka-server</artifactId>-->
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${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>
</plugin>
</plugins>
</build> <!-- 使用里程碑版需要下面的配置（Spring官网上的配置更为简洁，
更适合每个版本 http://projects.spring.io/spring-boot/）。新版本新特性，如开发热部署 -->
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories> </project>
启动类为：
@SpringBootApplication
@EnableEurekaClient
@RestController
public class SpringcloudEurekaClientApplication { public static void main(String[] args) {
SpringApplication.run(SpringcloudEurekaClientApplication.class, args);
} @Value("${server.port}")
String port;
@RequestMapping("/")
public String home() {
return "hello world from port " + port;
} }
配置文件为：
eureka:
client:
serviceUrl:
defaultZone: http://localhost:9999/eureka/
server:
port: 8888
spring:
application:
name: service-eurekaclient
访问即可发现服务已经注册。
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