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1 EurekaServer
1.1 EurekaServer
1 新建立一个EurekaServer
2 配置 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.clevercode.biz</groupId>
<artifactId>userservice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>userservice</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.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.SR2</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<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-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
3 配置application.yml
server:
port: 8761
eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
4 编写EurekaserverApplication
package com.clevercode.biz.eurekaserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurekaserverApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaserverApplication.class, args);
}
}
5 启动后再浏览器中输入
http://localhost:8761/
1.2 EurekaServer主备模式
1 EurekaServer可以两两相互 注册，形成主备模式 ，这样可以减少单机风险。还是按照1.1的方式新建 EurekaServer,主要是修改 配置文件。2 peer1中的EurekaServer的application.yml配置
spring:
application:
name: eureka-server
server:
port: 8761
eureka:
instance:
hostname: peer1
client:
serviceUrl:
defaultZone: http://peer2:8762/eureka/
3 peer2中的EurekaServer的application.yml配置
spring:
application:
name: eureka-server
server:
port: 8762
eureka:
instance:
hostname: peer2
client:
serviceUrl:
defaultZone: http://peer1:8761/eureka/
4 配置host
vim /etc/hosts
127.0.0.1 peer1
127.0.0.1 peer2
5 启动 后 在浏览器 中可以查看,可以看到peer2
2 EnableDiscoveryClient
1.1 新建一个 微服务
1 EnableDiscoveryClient，主要是 微服务注册到Eureka中。 新建一个 微服务 USER-SERVICE
2 配置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.clevercode.biz</groupId>
<artifactId>userservice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>userservice</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.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.SR2</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<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-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>
3 配置application.yml
server:
port: 8001
spring:
application:
name: USER-SERVICE
eureka:
client:
service-url:
defaultZone: http://peer1:8761/eureka,http://peer2:8762/eureka
4 UserserviceApplication
package com.clevercode.biz.userservice;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@EnableDiscoveryClient
@SpringBootApplication
public class UserserviceApplication {
public static void main(String[] args) {
SpringApplication.run(UserserviceApplication.class, args);
}
}
5 新建一个 控制器
package com.clevercode.biz.userservice.controller;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.EurekaClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private EurekaClient discoveryClient;
@RequestMapping("/index")
String index() {
return "this is from: userservice /user/index。 hello!";
}
@RequestMapping("/discoveryjava")
String discoveryjava() {
InstanceInfo instance = discoveryClient.getNextServerFromEureka("ORDER-SERVICE", false);
return instance.getHomePageUrl();
}
}
6 1-5同样的 方式 新建一个order-service
7 启动后查注册 情况
3 服务 发现 与调用
3 .1发现 与调用
在浏览 其中输入http://10.4.13.140:8001/user/discoveryjava，可以 看到discoveryClient.getNextServerFromEureka("ORDER-SERVICE", false),获取了order-service的实例。其中 order-service的 地址是 ：http://10.4.13.140:8003/
4 相关源码
https://github.com/cj58/springcloud/tree/master/eurekaserver,
https://github.com/cj58/springcloud/tree/master/eurekaserverback,
https://github.com/cj58/springcloud/tree/master/orderservice,