MAVEN多模塊項(xiàng)目Spring'Cloud'Eureka

使用IDEA新建MAVEN的多模塊項(xiàng)目

Spring Cloud的環(huán)境配置：

JDK/SDK：1.8.0_212

Maven version: 3.5.0

spring-boot.version：2.1.6.RELEASE

spring-cloud.version：Greenwich.RELEASE

[TOC]

一、Spring Cloud和Spring Boot的版本

注意: 截至到今天（2019/08/02），各個(gè)版本的對(duì)應(yīng)情況：

Release Train Boot Version
Greenwich 2.1.x
Finchley 2.0.x
Edgware 1.5.x
Dalston 1.5.x

請(qǐng)注意Spring Cloud的overview里的這段話：

Finchley builds and works with Spring Boot 2.0.x, and is not expected to work with Spring Boot 1.5.x.

Note: The Dalston release train will reach end-of-life in December 2018. Edgware will follow the end-of-life cycle of Spring Boot 1.5.x.

The Dalston and Edgware release trains build on Spring Boot 1.5.x, and are not expected to work with Spring Boot 2.0.x.

以上內(nèi)容摘自：https://spring.io/projects/spring-cloud#overview

二、創(chuàng)建服務(wù)注冊(cè)和發(fā)現(xiàn)中心

Spring Cloud Netflix項(xiàng)目提供的集成有：

服務(wù)發(fā)現(xiàn)（Eureka）

斷路器（Hystrix）

智能路由（Zuul）

客戶端負(fù)載平衡（Ribbon）

2.1、創(chuàng)建服務(wù)的父級(jí)工程

我使用的是Eureka，之前我也用過Consul，先說一下Eureka吧。

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注意Type的時(shí)候選擇Maven POM，然后一路next就可以了。修改pom文件如下：

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ac</groupId>
    <artifactId>echo-parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>echo-parent</name>
    <description>Demo project for Spring Boot</description>

    <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>Greenwich.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <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>

2.2、創(chuàng)建子項(xiàng)目Eureka Service和Eureka Client

在echo-parent的項(xiàng)目上右鍵-->>New-->>Module，選擇Spring Initializr，選擇合適的GAV屬性標(biāo)簽，這里的Type選擇Maven Project，然后添加eureka對(duì)應(yīng)的起步依賴即可。

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修改eureka-service的pom文件如下：

<?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>
    <parent>
        <groupId>com.ac</groupId>
        <artifactId>echo-parent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.ac</groupId>
    <artifactId>eureka-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

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

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

在父級(jí)pom中添加eureka的module如下：

<modules>
    <module>eureka-service</module>
</modules>

在spring boot的啟動(dòng)類EurekaServiceApplication上添加eureka的注釋@EnableEurekaServer：

@SpringBootApplication
@EnableEurekaServer
public class EurekaServiceApplication {

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

}

配置文件采用yml格式：

spring:
  application:
    name: eurka-server

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

在yaml文件中的registerWithEureka和fetchRegistry設(shè)置成false，表明當(dāng)前是eureka的服務(wù)器端。在瀏覽器的地址欄輸入http://localhost:8761即可以看到eureka的界面了：

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接下來創(chuàng)建eureka的client項(xiàng)目，創(chuàng)建過程同eureka server差不多，選擇的starter是客戶端：

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修改pom文件如下：

<?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>
    <parent>
        <groupId>com.ac</groupId>
        <artifactId>echo-parent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <groupId>com.ac</groupId>
    <artifactId>eureka-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

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

    <dependencies>
        <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>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml文件如下：

spring:
  application:
    name: eureka-client

server:
  port: 8762

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

eureka-client的啟動(dòng)類如下：

@SpringBootApplication
@EnableEurekaClient
@RestController
public class EurekaClientApplication {

    @RequestMapping("/")
    public String home() {
        return "Hello world";
    }

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

}

啟動(dòng)eureka-service和eureka-client，打開http://localhost:8761/就可以看到實(shí)例已經(jīng)注冊(cè)上去了，服務(wù)名稱是eureka-client，端口號(hào)是8762：

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打開http://localhost:8762/，可以看到我們的hello world。

注意：現(xiàn)在在eureka-client可以不用輸入注釋@EnableEurekaClient就可以開啟eureka的客戶端支持?。?！以下是spring cloud官方提供的說明，請(qǐng)注意：只要在classpath中引用了spring-cloud-starter-netflix-eureka-client的GAV就可以開始eureka的支持了，至于原理需要看一下源碼才能分析出來。

The following example shows a minimal Eureka client application:

@SpringBootApplication
@RestController
public class Application {

    @RequestMapping("/")
    public String home() {
        return "Hello world";
    }

    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).web(true).run(args);
    }

}

Note that the preceding example shows a normal Spring Boot application. By having spring-cloud-starter-netflix-eureka-client on the classpath, your application automatically registers with the Eureka Server. Configuration is required to locate the Eureka server, as shown in the following example: ... ...

摘自：https://cloud.spring.io/spring-cloud-static/Greenwich.SR2/single/spring-cloud.html#_service_discovery_eureka_clients

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