SpringClud一站式学习之Eureka服务治理(二)

SpringClud一站式学习之Eureka服务治理

  • 引言
  • [1. 搭建Eureka Server](#1. 搭建Eureka Server)
    • [1.1. 添加Eureka Server依赖](#1.1. 添加Eureka Server依赖)
    • [1.2. 添加 Eureka Server注解](#1.2. 添加 Eureka Server注解)
    • [1.3. 配置Eureka Server](#1.3. 配置Eureka Server)
    • [1.4. 运行Eureka Server](#1.4. 运行Eureka Server)
  • [2. 搭建Eureka Client 服务提供者](#2. 搭建Eureka Client 服务提供者)
    • [2.1. 添加依赖](#2.1. 添加依赖)
    • [2.2. 添加注解](#2.2. 添加注解)
    • [2.3. 配置Eureka Client](#2.3. 配置Eureka Client)
    • [2.4. 启动服务](#2.4. 启动服务)
  • [3. 搭建Eureka Client 消费者](#3. 搭建Eureka Client 消费者)
    • [3.1. 添加依赖](#3.1. 添加依赖)
    • [3.2. 配置](#3.2. 配置)
    • [3.3. 服务消费者获取服务提供者信息](#3.3. 服务消费者获取服务提供者信息)
    • [3.4. 启动服务消费者](#3.4. 启动服务消费者)
  • [4 搭建集群](#4 搭建集群)

引言

Eureka是Netflix开源的一款服务发现框架,它主要用于在微服务架构中定位服务,是服务之间调用的枢纽和关键。在微服务架构中,服务实例可能会动态地增加或减少,Eureka提供了服务注册和发现的功能,使得服务实例可以相互发现对方,而不需要硬编码服务地址。

Eureka的两个主要组件:

Eureka Server:服务注册中心,用于维护各个微服务实例的注册信息,各个微服务实例在启动时会向Eureka Server注册自己的信息,并定期发送心跳以表明自己的存活状态。当服务实例关闭或者网络问题导致心跳丢失时,Eureka Server会从注册信息中移除该实例。

Eureka Client:服务提供者和消费者都会使用Eureka Client来与Eureka Server进行通信。服务提供者在启动时会向Eureka Server注册自己的服务地址和端口,服务消费者通过Eureka Server查询服务提供者的地址,然后直接调用。

Eureka是Spring Cloud体系中的核心组件之一,它与Spring Cloud的其他组件(如Ribbon、Feign、Hystrix等)协同工作,提供了一套完整的微服务解决方案。通过Eureka,开发者可以更容易地实现服务的注册与发现,从而构建和管理复杂的微服务系统。

1. 搭建Eureka Server

1.1. 添加Eureka Server依赖

新建立springboot工程,添加Eureka Server依赖,

bash 复制代码
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>eurakaservertrue</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eurakaservertrue</name>
    <description>Demo project for Spring Boot</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>1.8</java.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</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</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>

1.2. 添加 Eureka Server注解

在启动类上添加注解,表明为Eureka Server

@EnableEurekaServer

1.3. 配置Eureka Server

bash 复制代码
spring.application.name=eurakaservertrue
server.port=8761
#从注册表中获取信息
eureka.client.fetch-registry=false
#允许自己注册到服务中
eureka.client.register-with-eureka=false

1.4. 运行Eureka Server

访问http://localhost:8761/ 出现此界面表示已经搭建好了服务

2. 搭建Eureka Client 服务提供者

2.1. 添加依赖

新建立一个spirngboot工程,并添加Eureka Client依赖

bash 复制代码
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>erakaclientprovide</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>erakaclientprovide</name>
    <description>Demo project for Spring Boot</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </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-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</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>

2.2. 添加注解

bash 复制代码
@EnableDiscoveryClient

2.3. 配置Eureka Client

bash 复制代码
spring.application.name=erakaclientprovide
server.port=8081

eureka.client.service-url.defaultZone: http://localhost:8761/eureka/
#自定义实例ID
eureka.instance.instance-id=${spring.application.name}:${spring.cloud.client.ip-address}:${server.port}

2.4. 启动服务

3. 搭建Eureka Client 消费者

3.1. 添加依赖

bash 复制代码
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>erakaclientconsumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>erakaclientconsumer</name>
    <description>Demo project for Spring Boot</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </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-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</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>

3.2. 配置

bash 复制代码
spring.application.name=erakaclientconsumer
server.port=8082

eureka.client.service-url.defaultZone: http://localhost:8761/eureka/
#自定义实例ID
eureka.instance.instance-id=${spring.application.name}:${spring.cloud.client.ip-address}:${server.port}

3.3. 服务消费者获取服务提供者信息

编写controller 方法获取

java 复制代码
package com.example.erakaclientconsumer.controller;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @Auther: lifang
 * @Description
 * @Date: $ $
 * $
 * $
 **/
@RestController
public class EurekeController {

    @Autowired
    private DiscoveryClient discoveryClient;

    //获取Eureka服务中所有的提供者信息

    @GetMapping("/instance")
    public List<ServiceInstance> getApplication()
    {
    List<ServiceInstance> instances=discoveryClient.getServices().stream().
            map(sid->discoveryClient.getInstances(sid))
            .collect(Collectors.toList())
            .stream().flatMap(list->list.stream()).collect(Collectors.toList());
    return instances;
    }
}

3.4. 启动服务消费者

访问 http://localhost:8761/

访问 http://localhost:8082/instance

bash 复制代码
[
    {
        "metadata": {
            "management.port": "8082"
        },
        "secure": false,
        "uri": "http://localhost:8082",
        "instanceInfo": {
            "instanceId": "erakaclientconsumer:192.168.10.1��8082",
            "app": "ERAKACLIENTCONSUMER",
            "appGroupName": null,
            "ipAddr": "192.168.10.1",
            "sid": "na",
            "homePageUrl": "http://localhost:8082/",
            "statusPageUrl": "http://localhost:8082/actuator/info",
            "healthCheckUrl": "http://localhost:8082/actuator/health",
            "secureHealthCheckUrl": null,
            "vipAddress": "erakaclientconsumer",
            "secureVipAddress": "erakaclientconsumer",
            "countryId": 1,
            "dataCenterInfo": {
                "@class": "com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo",
                "name": "MyOwn"
            },
            "hostName": "localhost",
            "status": "UP",
            "overriddenStatus": "UNKNOWN",
            "leaseInfo": {
                "renewalIntervalInSecs": 30,
                "durationInSecs": 90,
                "registrationTimestamp": 1731075179095,
                "lastRenewalTimestamp": 1731075329123,
                "evictionTimestamp": 0,
                "serviceUpTimestamp": 1731075179095
            },
            "isCoordinatingDiscoveryServer": false,
            "metadata": {
                "management.port": "8082"
            },
            "lastUpdatedTimestamp": 1731075179095,
            "lastDirtyTimestamp": 1731075179034,
            "actionType": "ADDED",
            "asgName": null
        },
      
]

4 搭建集群

集群多个节点组成的服务器群,一个Eureka Server服务是一个节点,不同节点之间服务信息是相互复制的,对于Eureka Server不同的节点代码是一样的,不同的是地址不同,因此我们通过配置不同环境的方法启动2个Eureka Server,创建 application-A.properties 和application-B.properties,在application.properties,指定当前的配置文件,启动后更改下一个节点的配置文件;

bash 复制代码
server.port=8762
eureka.client.service-url.defaultZone: http://localhost:8761/eureka/
bash 复制代码
server.port=8761
eureka.client.service-url.defaultZone: http://localhost:8762/eureka/
bash 复制代码
spring.profiles.active=B
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