spring-cloud服务注册与服务发现

1.服务注册

项目名称:recommend

 

pom配置

        <dependency>
            <groupId>recommend</groupId>
            <artifactId>recommend-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

api的接口包中就一个接口(recommend-api Moudle)

@FeignClient(name = "recommend-service")
public interface PtjobRecommender {

    @GetMapping("/recommend/user")
    List<Long> recommend2One(String userId);

}

第二个moudle里包括服务的具体内容和项目的启动(recommend-services Moudle)

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
//
//
//@EnableDiscoveryClient
@EnableEurekaClient
//@EnableFeignClients
@EnableConfigurationProperties
@SpringBootApplication(scanBasePackages = {"campus.recommend.service"})
public class RecommendApplication {

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


@RestController
@RequestMapping(value = "/recommend")
public class RecommendService implements Recommender {

    @Override
    @RequestMapping(value = "/user",method = RequestMethod.GET)
    public List<Long> recommend2One(@RequestParam String id) {

        return Arrays.asList(1L,2L,3L);
    }
}

yml配置文件

spring:
  application:
    name: recommend-service
  profiles:
    active: dev

eureka:
  client:
    registry-fetch-interval-seconds: 10 #设置拉取服务注册信息时间，默认60s
  instance:
    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${server.port}
    ip-address: ${spring.cloud.client.ip-address}
    prefer-ip-address: true
    health-check-url-path: /actuator/health
    lease-renewal-interval-in-seconds: 15 #指定续约更新频率，默认是30s
    lease-expiration-duration-in-seconds: 45 #设置过期剔除时间，默认90s

启动项目

 

2.服务发现

启动第二个项目web-demo

 

pom配置

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.1.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.1.RELEASE</version>
        </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-autoconfigure</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j-impl</artifactId>
            <version>2.10.0</version>
        </dependency>

        <dependency>
            <groupId>campus-recommend</groupId>
            <artifactId>campus-recommend-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>io.github.openfeign</groupId>
            <artifactId>feign-core</artifactId>
            <version>9.5.1</version>
        </dependency>

2.java文件

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableDiscoveryClient
@EnableFeignClients(basePackages = "campus.recommend.api")
@SpringBootApplication
public class Application {

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

}

@RestController
@RequestMapping(value="/api")
public class Hello implements HelloWorld {

    @Resource
    private Recommender recommender;

    @GetMapping("/o")
    public String sayHello() {
        return "hello" + recommender.recommend2One("");

    }
}

3.yaml配置

server:
  port:8082

spring:
  application:
    name: web-demo

eureka:
  instance:
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka

feign默认使用ribbon作负载均衡，其中默认规则是轮询，如果要修改规则可通过定义配置类

@RibbonClient(name="recommend-services", configuration=LbConfig.class)
public class LbConfig {

    @Bean
    public IRule getRule(){
        return new RondomRule();
    }
    
}