SpringCloud -- Eureka

时间：2024-03-30 14:56:44

1 EurekaServer

1.1 EurekaServer

1 新建立一个EurekaServer

SpringCloud -- Eureka

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/
SpringCloud -- Eureka

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
SpringCloud -- Eureka

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

SpringCloud -- Eureka

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
SpringCloud -- Eureka

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/

SpringCloud -- Eureka

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,

https://github.com/cj58/springcloud/tree/master/userservice

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