Spring-Cloud之Eureka排坑之旅

1 快速demo

1.0 环境说明

  Intelli IDEA+Spring Boot

1.1 新建工程chap52（通过New Project->Spring Initializer->web）

修改pom文件：

<groupId>com.chen4du</groupId>
<artifactId>chap52</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>

<name>chap52</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.2.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>Dalston.SR1</spring-cloud.version>
</properties>

<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>

1.2 新建module：eurekaserver（通过New Project->Spring Initializer->web），修改pom文件

<parent>
    <groupId>com.chen4du</groupId>
    <artifactId>chap52</artifactId>
    <version>0.0.1-SNAPSHOT</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>
</properties>

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

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

添加application.yml文件

server:
  port: 8761

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

为EurekaserverApplication文件添加注解

@EnableEurekaServer
@SpringBootApplication
public class EurekaserverApplication {

    public static void main(String[] args) {

        SpringApplication.run(EurekaserverApplication.class, args);
    }
}

1.3 新建module：eurekaclient（通过New Project->Spring Initializer->web），修改pom文件

<parent>
    <groupId>com.chen4du</groupId>
    <artifactId>chap52</artifactId>
    <version>0.0.1-SNAPSHOT</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>
</properties>

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

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

添加文件bootstrap.yml

eureka:
    client:
        serviceUrl:
            defaultZopne: http://localhost:8761/eureka/
server:
    port: 8762
spring:
    application:
        name: eureka-client

为EurekaclientApplication添加注解

@SpringBootApplication
@EnableEurekaClient
public class EurekaclientApplication {

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

1.4 调试

运行EurekaserverApplication，访问http:localhost:8761
运行EurekaclientApplication，访问http:localhost:8761 可以看到服务已注册

2 排坑之旅

2.1 注解添加无效

开始以为是包之间冲突，各种调版本，后来发现是因为chap52的pom文件中打包方式有误，默认是jar，要改成pom，后续子模块才能依赖到父模块的包

2.2 yml文件格式

注意value和key之间有个空格，勿丢。