(Turn) micro service _ to create a simple registry Eureka

      Original Address: https: //www.cnblogs.com/lplshermie/p/9105329.html

Micro Services and distributed has become a very common technique, in order to keep pace with the times, recently started learning SpringCloud, start from Eureka. The two of them not be introduced, online instructions bunch, just open a search engine, enter keywords enough to understand it, and this paper is a very simple demo recording I follow the example set up eureka online registry, only records only for learning little guidance, the following direct start.

　　A. Tools

• IDE  :  Intellij IDEA  2018.1
• JDK :  1.8
• Maven ：3.3.9

　　II. Creating a master project maven

　　① Open IDEA, create a new project

　　

　　After selecting the Maven project

　　

　　Here's what not checked, direct the next step

　　

　　Click Next

　　

　　Then click Finish, you've created the project as shown below　　

 

　　III. Creating a Eureka-server module as a service registry

　　① Right-click the project created, New-> Module

　　　

　　② Select Spring Initializr, and then click Next

　　

　　③ Input Module infos

　　

　　④ Highlight Cloud Discovery, the right check Eureka Server

　　

　　⑤ then all the way directly to the Finish created. After the creation of project structure shown in Fig.

　　

　　pom.xml items shown below

<?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.norexis</groupId> <artifactId>eureka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>eureka-server</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.2.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.BUILD-SNAPSHOT</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-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> <repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>

　　⑦想要创建服务中心，只需要在项目的启动类Application.java上添加一个@EnableEurekaServer注解

　　

　　此外，还需要对eureka server进行一些配置，这里采用yml的形式，删除resources下的application.properties，创建application.yml

　　

server:
  port : 8761

eureka:
  instance:
    hostname : localhost
  client:
    registerWithEureka : false
    fetchRegistry : false
    serviceUrl:
      defaultZone : http://${eureka.instance.hostname}:${server.port}/eureka/

　　然后启动Application.java即可。

　　至此，Eureka Server的创建完成，为了验证效果，可以打开浏览器，输入http://localhost:8761，即可看到eureka的注册中心界面

　　

　　可以看到此时Application里那里显示No instances available，因为此时还没有服务实例注册，我们需要创建一个服务实例

　　三.创建Eureka Client服务实例

　　①创建Eureka Client的module过程同Eureka Server 的过程完全一样，就不再说明。

　　②创建的Eureka Client需要在Application启动类上添加注解 @EurekaDiscoveryClient

　　

　　③同Server一样，创建一个新的yml配置文件，添加如下配置

　　

eureka:
  client:
    serviceUrl:
      defaultZone : http://localhost:8761/eureka/
server:
  port: 8762
spring:
  application:
    name : service-test

　　④之后启动application，再次打开Eureka注册中心，可以看到已经成功注册服务，显示service-test

　　

　　⑤在地址栏输入Http://localhost:8762/info?name=norexis，可以看到如下信息

　　

　　到这里，一个简单的eureka注册中心和服务实例均已完成