Eureka服务注册与发现-提供消费服务模型

1.工具及软件版本

• JDK1.8
• Spring Boot 1.4.3.RELEASE

<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>1.4.3.RELEASE</version>
 <relativePath/> <!-- lookup parent from repository -->
</parent>

• Spring Cloud Camden SR4

<!--引入spring-cloud依赖-->
<dependencyManagement>
 <dependencies>
 <dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-dependencies</artifactId>
 <version>Camden.SR4</version>
 <type>pom</type>
 <scope>import</scope>
 </dependency>
 </dependencies>
</dependencyManagement>

• Maven3.3.9
• 数据库：mysql5.7
• 项目目录

2.编写EureKa Server

• 项目：microservice-discovery-eureka
• 在pom.xml中添加以下依赖

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

• 编写启动类，在启动类上添加@EnableEurekaServer

@SpringBootApplication
@EnableEurekaServer
public class MicroserviceDiscoveryEurekaApplication {
 public static void main(String[] args) {
 SpringApplication.run(MicroserviceDiscoveryEurekaApplication.class, args);
 }
}

• 在配置文件application.yml中添加以下内容

server:
 port: 8761
eureka:
 client:
 registerWithEureka: false
 fetchRegistry: false
 serviceUrl:
 defaultZone: http://localhost:8761/eureka

3.将服务提供者注册到Eureka Server上

• 项目：microservice-simple-provider-user
• 在pom.xml添加添加以下依赖

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

• 在配置文件application.yml中添加以下配置

server:
 port: 8000
 
spring:
 application:
 name: microservice-provider-user
 datasource:
 url: jdbc:mysql://127.0.0.1:3306/springcloud
 username: root
 password: root
 driver-class-name: com.mysql.jdbc.Driver
 jpa:
 properties:
 hibernate:
 hbm2ddl:
 auto: none
 show-sql: true
 devtools:
 restart:
 additional-exclude: non-restart/**
 resources:
 static-locations: classpath:/resources/static/,classpath:/static/
 
eureka:
 client:
 serviceUrl:
 defaultZone: http://localhost:8761/eureka/
 instance:
 prefer-ip-address: true
 
logging:
 level:
 org:
 springframework:
 security: INFO

• 在启动类上添加@EnableDiscoveryClient注解，声明这是一个Eureka Client

@SpringBootApplication
@EnableDiscoveryClient
public class MicroserviceSimpleProviderUserApplication {
 public static void main(String[] args) {
 SpringApplication.run(MicroserviceSimpleProviderUserApplication.class, args);
 }
}

4.将服务消费者注册到Eureka Server上

• 项目：microservice-simple-consumer-movie
• 在pom.xml中添加以下依赖

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

• 在配置文件application.yml中添加以下配置

server:
 port: 8010
 
user:
 userServiceUrl: http://MICROSERVICE-PROVIDER-USER/
 
spring:
 application:
 name: microservice-consumer-movie
 
eureka:
 client:
 serviceUrl:
 defaultZone: http://localhost:8761/eureka/
 instance:
 prefer-ip-address: true

• 在启动类上添加@EnableDiscoveryClient注解，声明这是一个Eureka Client

@SpringBootApplication
@EnableDiscoveryClient
public class ConsumerMovieApplication {
 @Bean
 @LoadBalanced
 public RestTemplate restTemplate(){
 return new RestTemplate();
 }
 public static void main(String[] args) {
 SpringApplication.run(ConsumerMovieApplication.class, args);
 }
}

• 服务调用

@RestController
public class MovieController {
 
 @Autowired
 private RestTemplate restTemplate;
 
 @Value("${user.userServiceUrl}")
 private String userServiceUrl;
 
 @GetMapping("/user/{id}")
 public User findById(@PathVariable Long id){
 return this.restTemplate.getForObject(this.userServiceUrl + id,User.class);
 }
}

 

注意：消费者调用提供者的服务，可用通过IP的形式也可以通过服务名称，如果通过服务名称获取需要引入ribbon。