springCloud的使用01-----服务的注册和发现

1 搭建eureka注册服务器

　　1.1 创建springboot项目，导入相应的jar包依赖

<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.ibeifeng.hadoop</groupId>
    <artifactId>beifeng-spring-cloud-eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>beifeng-spring-cloud-eureka-server</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath />
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.RC1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

        <!-- 声明为web项目 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 注册服务器需要的依赖  -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>

    </dependencies>

    <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>

　　1.2 配置注册服务器的配置信息

server:
 port: 8761
eureka:
 instance:
  hostname: localhost
 client:
  registerWithEureka: false #有这两个属性表示不需要向自己注册，表明自己为ecureka server
  fetchRegistry: false
  serviceUrl:
   defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

　　1.3 在启动类中声明该项目为注册服务器

@SpringBootApplication  //相当于@Configuration、@EnableAutoConfiguration和 @ComponentScan
@EnableEurekaServer
public class SpringCloudEurekaServer {

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

　　1.4 启动查看是否搭建成功

2  搭建提供服务的服务提供者

　　2.1 创建springboot项目，引入相关依赖

<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.ibeifeng.hadoop</groupId>
    <artifactId>beifeng-spring-cloud-eureka-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>beifeng-spring-cloud-eureka-client</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath />
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.RC1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

        <!-- 声明为web项目 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

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

　　2.2 配置服务提供者的信息

eureka:
 client:
  serviceUrl:
   defaultZone: http://localhost:8761/eureka/ #注册服务器地址
server:
 port: 8762  #提供服务站的端口
spring:
 application:
  name: service-hi  #服务提供者的名称

　　2.3 在启动类中声明为服务提供者

@SpringBootApplication
@EnableEurekaClient //声明为服务提供者
@RestController
public class SpringCloudEurekaClient {

    @Value("${server.port}")
    private String port;

    @RequestMapping("/hi")
    String hello(){
        return "hello eureka client "+port;
    }

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

　　2.4 启动并查看是否注册成功