Spring Cloud Learning (i) registration and discovery of services (Eureka)

1 Creating a Service registration center

Here, the component I need to use is spring Cloud Netflix Eureka, Eureka is a service registration and Discovery module.

1.1 Creating the Model project as a service registration center Eureka-server

Project structure

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>com.seawaterbt.cloud</groupId> <artifactid>eureka-server</ artifactid> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>e Ureka-server</name> <description>demo Project for Spring boot</description> <parent> <groupId>org.springframework.boot</groupId> &        Lt;artifactid>spring-boot-starter-parent</artifactid> <version>1.5.13.RELEASE</version> <relativePath/> <!--lookup parent from repository to </parent> <properties> &LT;PR Oject.build.sourceencoding>utf-8</project.build.sourceencoding> <project.reporting.outputencoding >UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-c loud.version>edgware.sr4</spring-cloud.version> </properties> <dependencies> <depende Ncy> <groupId>org.springframework.cloud</groupId> <artifactid>spring-cloud-star ter-eureka-server</artifactid> </dependency> <dependency> <groupid>org.sp Ringframework.boot</groupid> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope>            </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> &LT;ARTIFACTID&G                T;spring-cloud-dependencies</artifactid> <version>${spring-cloud.version}</version> <type>pom</type> <scope>Import</scope> </dependency> </dependencies> </dependencyManagement> &LT;BUILD&G        T                <plugins> <plugin> <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>

1.2 Start the Service registration center Eureka-server

Springboot Startup class

 PackageCom.seawaterbt.cloud.eurekaserver;Importorg.springframework.boot.SpringApplication;Importorg.springframework.boot.autoconfigure.SpringBootApplication;Importorg.springframework.cloud.netflix.eureka.server.enableeurekaserver;@ Springbootapplication@enableeurekaserver Public classeurekaserverapplication { Public Static voidMain (string[] args) {Springapplication.run (eurekaserverapplication.class, args); }}

Application.yml

Server:   8761  Context-path:/eureka-Servereureka:  instance:    hostname:localhost  Client:     false      serviceurl: defaultzone:http://      ${eureka.instance.hostname}:${server.port}/eureka-server/

by Eureka.client.registerWithEureka:false and Fetchregistry:false to show that you are a Eureka server.

Start the project, open the browser access: http://localhost:8761/eureka-server/, the interface is as follows:

No application available no service was found ... ^_^ because there is no registration service, it is not possible to have services found.

2 Creating a service provider Eureka-client1.1 CreateModelEngineering as a service providereureka-client

Project structure

　　

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>com.seawatebt.cloud</groupId> <artifactid>eureka-client</ artifactid> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>e Ureka-client</name> <description>demo Project for Spring boot</description> <parent> <groupId>org.springframework.boot</groupId> &        Lt;artifactid>spring-boot-starter-parent</artifactid> <version>1.5.13.RELEASE</version> <relativePath/> <!--lookup parent from repository to </parent> <properties> &LT;PR Oject.build.sourceencoding>utf-8</project.build.sourceencoding> <project.reporting.outputencoding >UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-c loud.version>edgware.sr4</spring-cloud.version> </properties> <dependencies> <depende Ncy> <groupId>org.springframework.cloud</groupId> <artifactid>spring-cloud-star ter-eureka-server</artifactid> </dependency> <dependency> <groupid>org.sp Ringframework.boot</groupid> <artifactId>spring-boot-starter-web</artifactId> </dependency> <depende Ncy> <groupId>org.springframework.boot</groupId> <artifactid>spring-boot-starte    r-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> &LT;BUILD&G        T                <plugins> <plugin> <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>

1.2 Creating a simple service interface

Directory structure

Infocontroller.java

 PackageCom.seawatebt.cloud.eurekaclient.controller;ImportOrg.springframework.beans.factory.annotation.Value;Importorg.springframework.web.bind.annotation.GetMapping;ImportOrg.springframework.web.bind.annotation.RequestParam;ImportOrg.springframework.web.bind.annotation.RestController; @RestController Public classInfocontroller {@Value ("${server.port}")     PublicString Port; @GetMapping ({"/hi", "/hello"})     PublicString Hi (@RequestParam (value = "Name", defaultvalue = "SEAWATERBT") (String name) {return"Name=" +name+ "-----port=" +Port; }}

1.3Start a service providereureka-client

Configuring the Springboot Startup class

Eurekaclientapplication

 Packagecom.seawatebt.cloud.eurekaclient;Importorg.springframework.boot.SpringApplication;Importorg.springframework.boot.autoconfigure.SpringBootApplication;Importorg.springframework.cloud.netflix.eureka.EnableEurekaClient, @SpringBootApplication @enableeurekaclient Public classeurekaclientapplication { Public Static voidMain (string[] args) {Springapplication.run (eurekaclientapplication.class, args); }}

Application.yml

Server:   8762  Context-path:/eureka-client# service name Spring:  application:    name:server-  Hieureka:  client:    serviceurl:      defaultzone:http://localhost:8761/ eureka-server/eureka/

Spring.application.name, this is very important, this in the future between service and service calls are generally based on this name

To start the project, open http://localhost:8761/eureka-server/, which is the Eureka server URL:

You will find a service already registered in the service, the service name is Service-hi, the port is 8762

Visit Http://pc-20180321caba:8762/eureka-client/hi you will see on the browser:

3. References

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Spring Cloud Learning (i) registration and discovery of services (Eureka)