SpringCould之服务消费者(Ribbon)

SpringCloud 提供的服务消费者有两种(此处使用Ribbon实现)

• Ribbon +RestTemplate
• fegin
  
  
  
  
  和SpringCloud其他服务一样 
  创建一个消费者工程项目(在父工程spring-cloud下创建一个 spring-cloud-ribbon 工程项目)
  
  pom.xml

  
  
      4.0.0
  
      
          com.funtl
          hello-spring-cloud-dependencies
          1.0.0-SNAPSHOT
          ../hello-spring-cloud-dependencies/pom.xml
      
  
      hello-spring-cloud-web-admin-ribbon
      jar
  
      hello-spring-cloud-web-admin-ribbon
      http://www.funtl.com
      2018-Now
  
      
          
          
              org.springframework.boot
              spring-boot-starter-web
          
          
              org.springframework.boot
              spring-boot-starter-tomcat
          
          
              org.springframework.boot
              spring-boot-starter-thymeleaf
          
          
              org.springframework.boot
              spring-boot-starter-actuator
          
          
              org.springframework.boot
              spring-boot-starter-test
              test
          
          
  
          
          
              org.springframework.cloud
              spring-cloud-starter-netflix-eureka-server
          
          
              org.springframework.cloud
              spring-cloud-starter-netflix-ribbon
          
          
  
          
          
              net.sourceforge.nekohtml
              nekohtml
          
      
  
      
          
              
                  org.springframework.boot
                  spring-boot-maven-plugin
                  
                      com.einblatt.hello.spring.cloud.web.admin.ribbon.WebAdminRibbonApplication
                  
              
          
      
  

  
  通过 @EnbleDisconverClient 注解注册到服务中心

  package com.funtl.hello.spring.cloud.web.admin.ribbon;
  
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
  
  @SpringBootApplication
  @EnableDiscoveryClient
  public class WebAdminRibbonApplication {
      public static void main(String[] args) {
          SpringApplication.run(WebAdminRibbonApplication.class, args);
      }
  }

  
  配置程序端口号等
  application.yml

  spring:
    application:
      name: hello-spring-cloud-web-admin-ribbon
    thymeleaf:
      cache: false
      mode: LEGACYHTML5
      encoding: UTF-8
      servlet:
        content-type: text/html
  
  server:
    port: 8764
  
  eureka:
    client:
      serviceUrl:
        defaultZone: http://localhost:8761/eureka/   #Eureka服务注册中心地址

   配置RestTemplata 的Bean使用 并且通过@LoadBalanced 注解开启负载均衡功能
   

  package com.funtl.hello.spring.cloud.web.admin.ribbon.config;
  
  import org.springframework.cloud.client.loadbalancer.LoadBalanced;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.web.client.RestTemplate;
  
  @Configuration
  public class RestTemplateConfiguration {
  
      @Bean
      @LoadBalanced
      public RestTemplate restTemplate() {
          return new RestTemplate();
      }
  }

  
   创建测试用的Service
  
  在这里我们直接用的程序名替代了具体的 URL 地址，在 Ribbon 中它会根据服务名来选择具体的服务实例，根据服务实例在请求的时候会用具体的 URL 替换掉服务名

  package com.funtl.hello.spring.cloud.web.admin.ribbon.service;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  import org.springframework.web.client.RestTemplate;
  
  @Service
  public class AdminService {
  
      @Autowired
      private RestTemplate restTemplate;
  
      public String sayHi(String message) {
          return restTemplate.getForObject("http://HELLO-SPRING-CLOUD-SERVICE-ADMIN/hi?message=" + message, String.class);
      }
  }

  创建测试用的Controller

  package com.funtl.hello.spring.cloud.web.admin.ribbon.controller;
  
  import com.funtl.hello.spring.cloud.web.admin.ribbon.service.AdminService;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.RestController;
  
  @RestController
  public class AdminController {
  
      @Autowired
      private AdminService adminService;
  
      @RequestMapping(value = "hi", method = RequestMethod.GET)
      public String sayHi(@RequestParam String message) {
          return adminService.sayHi(message);
      }
  }

   将Eureka服务端开启 
  
   访问 http://localhost:8764/hi?message=HelloRibbon
  
   浏览器交替显示(实现负载均衡)

  Hi，your message is :"HelloRibbon" i am from port：8762
  Hi，your message is :"HelloRibbon" i am from port：8763