springcloud-consumer=>集成eureka,

1.pom.xml

    <dependencies>

        <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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--添加uereka client 依赖包-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!--Actuator 开启健康检查依赖的包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!--添加ribbon依赖，spring Retry重试依赖-->
        <dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>


        <!--添加Feigin依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!--添加Hystrix 依赖包-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

        <!--Hystris监控依赖所需要的actuator包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!--整合Dashboard-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>


    </dependencies>

    <!--添加SpringCloud的依赖-->
    <dependencyManagement>

        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>

    </dependencyManagement>

2.启动类

@SpringCloudApplication //相当于@SpringBootApplication+@EnableDiscoveryClient+@EnableCircuitBreaker
//@SpringBootApplication// 表明是启动类
//@EnableDiscoveryClient //表明是Eurekak客户端

//开发Feigin远程调用的功能,属性basePackages 指定路径
@EnableFeignClients(basePackages = "com.tina.springcloud.springcloud.consumer7001.*")

//@EnableCircuitBreaker //开启熔断组件的功能 相当于@EnableHystrixDashboard+@EnableHystrix
//@EnableHystrixDashboard
//@EnableHystrix
public class SpringcloudConsumer7001Application {

    public static void main(String[] args) {
        SpringApplication.run(SpringcloudConsumer7001Application.class, args);
    }

}

3. 配置文件

server:
  port: 7001

spring:
  application:
    name: eureka-consumer
eureka:
  client:
    service-url:
      defaultZone: http://tina:123456@localhost:8001/eureka/
    healthcheck:
      #开启健康检查
      enabled: true
  instance:
    #采用IP注册
    prefer-ip-address: true
    #定义实例ID的格式
    instance.id: ${spring.application.name}:${sping.cloud.client.ip.address}:${server.port}
    #自定义实例跳转链接
    status-page-url: http://tina:123456@localhost:7001/consumer/getById/{id}
    #表示eureka client 发送心跳给server端的频率
    lease-renewal-interval-in-seconds: 5
    #表示eureka client 发送心跳给server端频率超过如下设置时间，service端则移除该实例
    lease-expiration-duration-in-seconds: 5

#配置ribbon
ribbon:
  eager-load:
    # 开启饥饿加载模式
    enabled: true
    # 指定需要饥饿加载的服务名
    clients:  http://tina:123456@localhost:8001/eureka/,http://tina:123456@localhost:8002/eureka/
  # 设置ribbon 最大连接数
  MaxTotalConnections: 500
  # 设置ribbon 每个host 最大的连接数
  MaxConnectionsPerHost: 500
  #对当前实例重试的次数
  maxAutoRetries: 5
  #切换实例的重试次数
  maxAutoRetriesNextServer: 5
  #对所有的操作请求都进行重试
  okToRetryOnAllOperations: true
  #Http响应码进行重试
  retryableStatusCodes: 500,404,502
### 针对单个服务的 Ribbon 配置
eureka-provider:
  ribbon:
    # 基于配置文件形式的 针对单个服务的 Ribbon指定负载均衡策略
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule #随机


#配置feign中 RemoteClient设置的日志级别
logging:
  level:
    com.tina.eureka.consumer.RemoteClient: info
feign:
  hystrix:
    enabled: true #默认是不开启，设置为true 是开启熔断的功能
 #配置熔断的超时时间
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMillisecond: 50000 # 熔断超时时长：10000ms

4. config

@Component
public class HystrixFallBack implements FallbackFactory<UserClient> {
    private Logger logger= LoggerFactory.getLogger(HystrixFallBack.class);
    @Override
    public UserClient create(final Throwable cause) {
        logger.error("HystrixFallBack回退的原因",cause);
        return new UserClient(){
            @Override
            public String getById(String id) {
                return "fail 调用失败了！！";
            }
        };
    }
}
=======================================================
@Configuration
public class FeignConfiguration {
    @Bean
    Logger.Level feiginLoggerLevel(){
        return Logger.Level.FULL;
    }
}
=======================================================
@FeignClient(name = "eureka-provider",
        configuration = FeignConfiguration.class,
        fallbackFactory = HystrixFallBack.class
)
public interface UserClient {

    @GetMapping("/user/getById/{id}")
    String getById(@PathVariable String id);


}

@RestController
@RequestMapping(value ="/consumer")
public class UserController{

    //使用Feign远程调用
    @Autowired
    private UserClient userClient;


    @GetMapping("/getById/{id}")
    public Object getById(@PathVariable  String id){
        return  userClient.getById(id).toString();
    }


    /**
     * 利用RestTemplate调用
     * @Autowired
     *     private RestTemplate restTemplate;
     *
     *     @GetMapping(value ="/consumer/getById/{id}")
     *     public String getById(@PathVariable  String id){
     *        return restTemplate.getForObject("http://tina:123456@eureka-provider/user/getById/"+id,String.class);
     *     }
     *
     */

}