SpringCloud微服务架构搭建（一）：注册与发现

首先spring-cloud相关的简介可以去百度搜索，这里就不多说了，这里分享一个翻译spring cloud官网的中文网站spring cloud中文网

这个学习项目的代码放在 https://github.com/fengzp/SpringCloudDemo

一、创建eureka服务注册中心

1.1创建工程

我这里选的是spring-boot1.4.6的版本，因为暂时1.5.+的版本，spring-cloud会有一些bug

我这里的关于spring-cloud的学习都是在同一个项目下练习的。

最后根的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>    <groupId>com.feng</groupId>    <artifactId>spring-cloud</artifactId>    <packaging>pom</packaging>    <version>0.0.1</version>    <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>Camden.SR7</spring-cloud.version>    </properties>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.4.6.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <dependencies>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </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>    <repositories>        <repository>            <id>spring-milestones</id>            <name>Spring Milestones</name>            <url>https://repo.spring.io/milestone</url>            <snapshots>                <enabled>false</enabled>            </snapshots>        </repository>    </repositories></project>

新建模块eureka-server
pom文件

<?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>spring-cloud</artifactId>        <groupId>com.feng</groupId>        <version>0.0.1</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>eureka-server</artifactId>    <dependencies>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka-server</artifactId>        </dependency>    </dependencies></project>

1.2
在resources下新建application.yml文件

server:  port: 8010 #服务端口eureka:  instance:    hostname: localhost  client:    register-with-eureka: false #是否将eureka自身作为应用注册到eureka注册中心    fetch-registry: false #为true时，可以启动，但报异常：Cannot execute request on any known server    serviceUrl:      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

1.3
ServerApplication，使用@EnableEurekaServe标识这是一个eureka中心

package com.feng;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;/** * @author fengzp * @date 17/4/27 * @email [e-mail] * @company 广州易站通计算机科技有限公司 */@SpringBootApplication@EnableEurekaServerpublic class ServerApplication {    public static void main(String[] args) {        SpringApplication.run(ServerApplication.class, args);    }}

运行成功后打开http://localhost:8010/

可以看到如下页面说明启动成功

二、新建服务提供者

2.1
新建模块service-a
pom文件

<?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>spring-cloud</artifactId>        <groupId>com.feng</groupId>        <version>0.0.1</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>service-a</artifactId></project>

2.2
新建配置文件application.yml
这里说明一点，端口可以使用${PORT:${SERVER_PORT:0}}来随机指定一个未使用的端口

spring:  application:    name: service-aserver:  port: 8810eureka:  client:    serviceUrl:          defaultZone: http://localhost:8010/eureka/ #eureka服务注册地址

2.3
ServiceApplication：
使用@EnableDiscoveryClient来标识是一个eurekaclient

/** * @author fengzp * @date 17/4/27 * @email [e-mail] * @company 广州易站通计算机科技有限公司 */@SpringBootApplication@EnableDiscoveryClient@RestControllerpublic class ServiceApplication {    public static void main(String[] args) {        SpringApplication.run(ServiceApplication.class, args);    }    @Value("${spring.application.name}")    private String name;    @Value("${server.port}")    private String port;    @RequestMapping("/hi")    public String hi(@RequestParam String id){        return "hi, " + id + ", " + name + ":" + port;    }}

2.4
运行后再次打开http://localhost:8010/可以看到服务已经注册到中心