Spring Cloud学习（Greenwich版）-02-服务注册与服务发现-Eureka

1、创建服务注册中心

1.1、创建父工程

下一步

下一步

finish

修改打包方式

定义常用工具类版本号

注意lombok需要安装

完整的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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.waterelephant</groupId>
    <artifactId>cloud-parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>cloud-parent</name>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
        <lombok.version>1.18.6</lombok.version>
        <guava.version> 27.1-jre</guava.version>
        <hutool.version>4.5.3</hutool.version>
        <commons-lang3.version>3.8.1</commons-lang3.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>

1.2、创建子模块api工程

创建Module

下一步 

 下一步

 一直下一步点击finish

引入常用的工具类

完整pom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">
    <parent>
        <artifactId>cloud-parent</artifactId>
        <groupId>com.waterelephant</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-api</artifactId>
    <dependencies>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>${guava.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-core</artifactId>
            <version>${hutool.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3.version}</version>
        </dependency>
    </dependencies>


</project>

 1.3、创建eureka注册中心

下一步

下一步

下一步

finish

修改server的parent工程

修改父工程的pom文件

完整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.waterelephant</groupId>
        <artifactId>cloud-parent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>cloud-eurekaserver</artifactId>


    <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-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>

 springcloud开发三板斧

1、进入jar包

2、启动类加注解

3、配置配置文件

jar包已经引入在启动类加上注解

@EnableEurekaServer

修改配置文件

 注意：楼主使用的yml配置

配置具体如下：

server:
  port: 8761
eureka:
  client:
    # 是否要注册到其他Eureka Server实例
    register-with-eureka: false
    # 是否要从其他Eureka Server实例获取数据
    fetch-registry: false
    service-url:
      defaultZone: http://localhost:8761/eureka/

2、创建eurekaClient

一直下一步

2.1、引jar包

<?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">
    <parent>
        <artifactId>cloud-parent</artifactId>
        <groupId>com.waterelephant</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-order</artifactId>
    <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>

    </dependencies>
</project>

 2.2、配置启动类

@EnableDiscoveryClient

早期的版本（Dalston及更早版本）还需在启动类上添加注解@EnableDiscoveryClient或@EnableEurekaClient ，从Edgware开始，该注解可省略。 

 2.3、修改配置

server:
  port: 8088
spring:
  application:
    # 指定注册到eureka server上的服务名称，对于电影微服务，本系列将名称设为microservice-consumer-movie
    name: cloud-order
eureka:
  client:
    service-url:
      # 指定eureka server通信地址，注意/eureka/小尾巴不能少
      defaultZone: http://localhost:8761/eureka/
  instance:
    # 是否注册IP到eureka server，如不指定或设为false，那就会注册主机名到eureka server
    prefer-ip-address: true

分别启动两个微服务访问

http://127.0.0.1:8761/

可以看到

代表EurekaServer和 EurekaClientqid