最近跟着方志明老师学习SpringCloud，博客地址如下：
https://blog.csdn.net/forezp/article/details/81040925
自己也跟着撸了一遍，纸上得来终觉浅，绝知此事要躬行，以下是自己撸的时候的总结&注意事项：
（一）创建maven项目
打开idea
File—new—project—maven
创建maven项目
Pom文件导入相应服务的依赖
<?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>springcloud</groupId> <artifactId>clouddemo</artifactId> <version>1.0-SNAPSHOT</version> <packaging>pom</packaging> <name>clouddemo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.RELEASE</version> <relativePath/> </parent> <modules> <module>eureka-server</module> <module>service-hi</module> </modules> <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.RELEASE</spring-cloud.version> </properties> <dependencies> <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></project>注：
version版本升级到了2.1.1，不然会报java.lang.AbstractMethodError: null at org.springframework.core.OrderComparator.findOrder等错误
<version>2.1.1.RELEASE</version>（二）创建2个model工程作为服务注册中心：Eureka server & Eureka client
2.1Eureka server
2.1.1
父项目—new—module—spring initializr—cloud discovery—eureka server
继承父pom文件，引入spring—cloud—starter—Netflix—eureka—server的依赖
<?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> <parent> <groupId>springcloud</groupId> <artifactId>clouddemo</artifactId> <version>1.0-SNAPSHOT</version> </parent> <groupId>com.springcloud</groupId> <artifactId>eureka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>eureka-server</name> <description>Demo project for Spring cloud</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies></project>2.1.2启动一个服务注册中心，需要一个注解@EnableEurekaServer，这个注解需要在springboot工程的启动application类上加：
@SpringBootApplication@EnableEurekaServerpublic class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run(EurekaServerApplication.class, args); }}
2.1.3配置文件appication.yml，指定server：
server: port: 8761eureka: instance: hostname: localhost client: #通过eureka.client.registerWithEureka：false和fetchRegistry #false来表明自己是一个eureka server registerWithEureka: false fetchRegistry: false serviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/spring: application: name: eurka-server完成以后，启动服务，打开启动工程,打开浏览器访问：http://localhost:8761页面，显示没有服务--没有注册服务当然不可能有服务被发现了。。。。
2.2 Eureka client--server-hi
步骤同2.1，创建module项目（服务提供者）
pom文件
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>springcloud</groupId> <artifactId>clouddemo</artifactId> <version>1.0-SNAPSHOT</version> </parent> <groupId>com.eureka.client</groupId> <artifactId>service-hi</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>service-hi</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>2.2.1启动类添加注解，注解@EnableEurekaClient 表明自己是一个eurekaclient
@SpringBootApplication
@EnableEurekaClient
@RestController
public class ServiceHiApplication {
public static void main(String[] args) {
SpringApplication.run( ServiceHiApplication.class, args );
}
@Value("${server.port}")
String port;
@RequestMapping("/hi")
public String home(@RequestParam(value = "name", defaultValue = "clouddemo") String name) {
return "hi " + name + " ,i am from port:" + port;
}
}
2.2.2在配置文件中注明自己的服务注册中心的地址
server: port: 8762spring: application: name: service-hieureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/
3.1启动eureka-server服务，打开 http://localhost:8761
3.2启动service-hi服务，访问service-hi页面，http://localhost:8762/hi?name=clouddemo
3.3刷新eureka-server访问的页面服务已经注册在服务中了，服务名为SERVICE-HI ,端口为7862
来源：https://www.cnblogs.com/koudaiyoutang/p/10760586.html