springboot-cloud-1-eureka

   github地址：https://github.com/github-ygy/spring_cloud_test
整体学习思路：
    1.服务提供者在启动时，向注册中心注册自己提供的服务。
    2.服务消费者在启动时，向注册中心订阅自己所需的服务。
    3.注册中心返回服务提供者地址给消费者。
    4.服务消费者从提供者的地址中调用服务。

eureka-server

        服务注册中心，提供服务注册于发现的功能，同时自己也可以开启服务注册。

pom

<?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>test.ygy.eureka</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>1.5.6.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>Dalston.SR2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>

开启服务端

    服务提供者，将服务注册到服务注册中心，其它消费者则可以通过服务注册中心发现服务，获取服务并消费。

@EnableEurekaServer  //开启服务注册中心
@SpringBootApplication
public class EurekaServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

application.properties

spring.application.name=server
####配置访问端口
server.port = 9999
eureka.instance.hostname=localhost
#####不需要注册
eureka.client.register-with-eureka=false
#####不需要检索服务
eureka.client.fetch-registry=false
###eureka 自我保护
###eureka.server.enable-self-preservation=false
###eureka client间隔多久去拉取服务注册信息  默认30秒
###eureka.client.registry-fetch-interval-seconds=30
###eureka server至上一次收到client的心跳之后，等待下一次心跳的超时时间 默认90秒
###eureka.instance.lease-expiration-duration-in-seconds=10
###eureka client发送心跳给server端的频率 默认30秒
###eureka.instance.lease-renewal-interval-in-seconds=5
###清理无效节点的时间间隔
###eureka.server.eviction-interval-timer-in-ms=0

client

开启客户端

@EnableEurekaClient
@SpringBootApplication
public class EurekaClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaClientApplication.class, args);
    }
}

application.properties

spring.application.name= client
server.port=8888
eureka.client.serviceUrl.defaultZone=http://localhost:9999/eureka/

server分片

hosts

127.0.0.1 pear1
127.0.0.1 pear2

application-server1.properties

server.port=9998
eureka.instance.hostname=test1
spring.application.name=server
eureka.client.serviceUrl.defaultZone=http://test1:9998/eureka/,http://test2:9999/eureka/
eureka.server.enable-self-preservation=false  //关闭保护机制
###eureka.instance.prefer-ip-address= true  //默认false 不适用ip

application-server2.properties

server.port=9998
eureka.instance.hostname=test1
spring.application.name=server
eureka.client.serviceUrl.defaultZone=http://test1:9998/eureka/,http://test2:9999/eureka/
eureka.server.enable-self-preservation=false
###eureka.instance.prefer-ip-address= true  //默认false 不适用ip

application-client.properties

spring.application.name= client
server.port=8888
eureka.client.serviceUrl.defaultZone=http://pear1:9998/eureka/,http://pear2:9999/eureka/