搭建

1. 空maven项目

   创建完成删除src

2. 注册中心

   Eureka注册中心

   1.创建module
   2.添加依赖 Eureka Discovery、Eureka Server
   3.启动类添加 @EnableEurekaServer
   4.配置yml
       server:
         port: 8801
       
       eureka:
         instance:
           hostname: localhost
         client:
           registerWithEureka: false
           fetchRegistry: false
           serviceUrl:
             defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
   5.测试 localhost:8801

   Zookeeper注册中心

3. 服务提供

   rest+ribbon

   1.创建module
   2.添加依赖 Eureka Discovery、Eureka Server、Ribbon
   3.启动类添加 
      @SpringBootApplication
      @EnableDiscoveryClient
      @ComponentScan
      public class RibbonConsumerApplication {
          public static void main(String[] args) {
              SpringApplication.run(RibbonConsumerApplication.class, args);
          }
          @Bean
          @Autowired
          @LoadBalanced
          RestTemplate getRestTemplate() {
              return new RestTemplate();
          }
      }
   4.创建测试服务
      @Service
      public class HelloService {
          public String sayHello(){
              return "helloWorld"; // 提供一个hello World
          }
      }
      @RestController
      public class HelloController {
          @Autowired
          private HelloService helloService;
          @GetMapping("/hello")
          public String sayHello(String name){
              return helloService.sayHello() + " " + name;
          }
      }
   5. 配置yml
       eureka:
         client:
           serviceUrl:
             defaultZone: http://localhost:8801/eureka/
       server:
         port: 8802
       spring:
         application:
           name: ribbon-provider
   6.测试 localhost:8802/hello?name=zhangtaifeng

4. 服务消费

   rest+ribbon消费

   @Service
   public class HelloService {
       @Autowired
       RestTemplate restTemplate;
       public String sayHello(){
           return restTemplate.getForObject("http://ribbon-provider/hello?name=jc2", String.class);
       }
   }

   Feign消费

   1.创建module
       2.添加依赖 Eureka Discovery、Eureka Server、Feign
       3.启动类添加 
          注册服务 -- @EnableDiscoveryClient
          注入Fegin -- @EnableFeignClients
       4.创建测试服务
          @FeignClient(value = "ribbon-consumer")
          public interface GetHello {
              @RequestMapping(value = "/hello?name=feign", method = RequestMethod.GET)
              public String sayHello();
          }
          @Service
          public class HelloService {
              @Autowired
              GetHello getHello;
              public String sayHello(){
                  return getHello.sayHello();
              }
          }
          @RestController
          public class HelloController {
              @Autowired
              private HelloService helloService;
              @GetMapping("/hello")
              public String sayHello(String name){
                  return helloService.sayHello() + " " + name;
              }
          }
       5. 配置yml
           eureka:
             client:
               serviceUrl:
                 defaultZone: http://localhost:8801/eureka/
           server:
             port: 8802
           spring:
             application:
               name: ribbon-provider
       6.测试 localhost:8802/hello?name=zhangtaifeng

5. 说明

   服务发现Eureka

   云端负载Ribbon

   HTTP客户端Feign

   熔断器Hystrix

   动态路由Zuul

   消息总线Spring Cloud Bus

   日志收集Spring Cloud Sleuth

   安全工具包Spring Cloud OAuth2