Spring Cloud學習隨筆微服務持續化快速集成

在Spring Cloud體系中暫時只用到以下這些服務：

• Eureka：核心，服務註冊中心
• Zuul：類似nginx
• Feign：服務消費者
• Hystrix：斷路器，類似事務處理

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Eureka

服務註冊中心，和Spring Cluod的核心部分，這裏我們讓Eureka和Spring Boot Admin在同一個工程中集成，便於管理

Eureka的部署十分簡單，直接上代碼，通過簡單配置就可以實現Spring Boot Admin和eureka的集成，在Spring Boot Admin的官方文檔【點次查看】中，還提供了很多UI插件

完整pom.xml代碼如下

<?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.reemii</groupId>
    <artifactId>eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.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>Edgware.SR2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-server</artifactId>
            <version>1.5.7</version>
        </dependency>

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

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

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

        <!-- UI module-->
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-server-ui-hystrix</artifactId>
            <version>1.5.7</version>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-server-ui-turbine</artifactId>
            <version>1.5.7</version>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-server-ui-activiti</artifactId>
            <version>1.5.7</version>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-server-ui-login</artifactId>
            <version>1.5.7</version>
        </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>

Application.java中加上相應的配置就可以完成啓動，在此項目中不建議加入其他代碼，該工程僅作爲註冊中心及一定監控中心來使用
完整代碼如下

package com.reemii.eureka;

import de.codecentric.boot.admin.config.EnableAdminServer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
import org.springframework.context.annotation.Configuration;

@SpringBootApplication
@EnableEurekaServer
@Configuration
@EnableAutoConfiguration
@EnableAdminServer
public class EurekaApplication {

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

application.yml完整代碼

spring:
  profiles:
    active: dev

eureka:
  client:
    registryFetchIntervalSeconds: 5
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

spring.boot.admin.routes.endpoints: env,metrics,dump,jolokia,info,configprops,trace,logfile,refresh,flyway,liquibase,heapdump,loggers,auditevents,hystrix.stream,activiti
spring.boot.admin.turbine:
  clusters: default
  location: turbine

#集成spring boot admin 上下文
spring.boot.admin.context-path: /admin

info:
  build:
    version: "@project.version@"
    description: "@project.description@"

application-dev.yml完整代碼

server:
  port: 8761
spring:
  application:
    name: eureka

eureka:
  instance:
    #配置註冊中心地址，正式環境一般爲內網地址
    hostname: localhost
    leaseRenewalIntervalInSeconds: 10

management.security.enabled: false

配置中的Info節點信息爲Spring Boot Admin中顯示版本信息及一些基礎信息所用

配置沒問題的話，基本可以一次點亮，訪問http://localhost:8761/爲eureka自帶的簡單管理界面

在配置中通過spring.boot.admin.context-path: /admin設置，則Spring Boot Admin訪問地址爲http://localhost:8761/admin

可以看到eureka自己也被當成服務註冊到註冊中心了

未完待續….