java
依赖
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| <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.qn</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>consumer-feign</artifactId>
</project>
|
配置
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| server:
port: 8900
spring:
application:
name: consumer-order-ribbon
eureka:
instance:
hostname: localhost
lease-expiration-duration-in-seconds: 15
lease-renewal-interval-in-seconds: 5
client:
service-url:
defaultZone: http://localhost:9999/eureka
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启动类
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| @SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class ConsumerFeignApp {
public static void main(String[] args) {
SpringApplication.run(ConsumerFeignApp.class,args);
}
}
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服务接口
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@FeignClient(value ="provider-user")
public interface UserService {
@GetMapping("/user/{id}")
User getUser(@PathVariable Long id);
}
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业务类（数据类同上省略）
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| @RestController
public class OrderController {
@Autowired
private UserService userService;
@GetMapping("/order/{id}")
public User getOrder(@PathVariable Long id){
return userService.getUser(id);
}
}
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测试
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| 启动eureka、同时启动两个提供者、启动Feign客户端，访问地址http://localhost:8900/order/1，可以看到，轮流访问两个提供者服务。说明 Feign 默认是集成了 Ribbon 的轮询方案。
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Feign 如何结合 Ribbon 切换均衡算法
可以在 application.yml 中指定，如下:
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| PROVIDER-USER:
ribbon:
NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule
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测试均衡算法
重启 Feign 客户端，访问上面那个 url，可以发现随机访问负载策略是生效的。
