SpringCloud的Ribbon和Feign

1.Ribbon和Feign都可以负载均衡

    a.Ribbon使用（在consumer端）

        pom.xml

                <!-- Ribbon相关 -->
		<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>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

        application.yml

server:
  port: 80
  
  
eureka:
  client:
    register-with-eureka: false
    service-url: 
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/  

       配置类

@Configuration
public class ConfigBean {
	
	@Bean
	@LoadBalanced//Spring Cloud Ribbon是基于Netflix Ribbon实现的一套客户端       负载均衡的工具。
	public RestTemplate getRestTemplate() {
		return new RestTemplate();
	}
	
}	

        controller

@RestController
public class DeptController_Consumer {
	@Autowired
	private RestTemplate restTemplate;
	
//	private static final String REST_URL_PREFIX = "http://localhost:8001";
	private static final String REST_URL_PREFIX = "http://MICROSERVICECLOUD-DEPT";
	
	@RequestMapping("/consumer/dept/add")
	public boolean add(Dept dept) {
		return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add", dept, Boolean.class);
	}
	
	@RequestMapping("/consumer/dept/get/{id}")
	public Dept get(@PathVariable("id") Long id) {
		return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
	}
	
	@SuppressWarnings("unchecked")
	@RequestMapping("/consumer/dept/list")
	public List<Dept> list(){
		return restTemplate.getForObject(REST_URL_PREFIX + "/dept/list", List.class);
	}
	
	// 测试@EnableDiscoveryClient,消费端可以调用服务发现
	@RequestMapping(value = "/consumer/dept/discovery")
	public Object discovery()
	{
		return restTemplate.getForObject(REST_URL_PREFIX + "/dept/discovery", Object.class);
	}

}

            启动类

@SpringBootApplication
@EnableEurekaClient
@RibbonClient(name="MICROSERVICECLOUD-DEPT")
public class DeptConsumer80_App {
	public static void main(String[] args) {
		SpringApplication.run(DeptConsumer80_App.class, args);
	}
}

        b.Feign使用（在consumer端）

            API中提供接口

@FeignClient(value = "MICROSERVICECLOUD-DEPT")
public interface DeptClientService {
	
	@RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
	public Dept get(@PathVariable("id") long id);

	@RequestMapping(value = "/dept/list", method = RequestMethod.GET)
	public List<Dept> list();

	@RequestMapping(value = "/dept/add", method = RequestMethod.POST)
	public boolean add(Dept dept);
}

            pom.xml

                <dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-feign</artifactId>
		</dependency>
		<!-- Ribbon相关 -->
		<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>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

            application.yml

server:
  port: 80
  

feign: 
  hystrix: 
    enabled: true
    
    
eureka:
  client:
    register-with-eureka: false
    service-url: 
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/  

            controller

@RestController
public class DeptController_Consumer
{
	@Autowired
	private DeptClientService service;

	@RequestMapping(value = "/consumer/dept/get/{id}")
	public Dept get(@PathVariable("id") Long id)
	{
		return this.service.get(id);
	}

	@RequestMapping(value = "/consumer/dept/list")
	public List<Dept> list()
	{
		return this.service.list();
	}

	@RequestMapping(value = "/consumer/dept/add")
	public Object add(Dept dept)
	{
		return this.service.add(dept);
	}
}

            启动类

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages= {"com.totto.springcloud"})
@ComponentScan("com.totto.springcloud")
public class DeptConsumer80_Feign_App
{
	public static void main(String[] args)
	{
		SpringApplication.run(DeptConsumer80_Feign_App.class, args);
	}
}

最后

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