官网提示引入ribbon需要引入spring-cloud-starter-netflix-ribbon依赖， 其实在eureka-client中已经做好了依赖处理，所以无需再次引入。
配置负载均衡策略
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@Bean
public IRule iRule() {
//默认是RoundRobinRule
return new RandomRule();
// return new RetryRule(n ew RandomRule(), 1);
}
自定义负载均衡策略
实现IRule接口
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public interface IRule{
public Server choose(Object key);
}
客户端针对不同服务配置不同负载均衡策略
@RibbonClients(value = {@RibbonClient(name = “SERVER-NAME1”, configuration = Consumer1Configure.class), @RibbonClient(name = “SERVER-NAME2”, configuration = Consumer2Configure.class)})
客户端请求封装
- 启动类添加@EnableFeignClients
- 定义FeignClient
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@FeignClient("SERVER-POWER") public interface PowerFeignClient { @RequestMapping("user") R getUser(); }
- controller中调用
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@Resource private PowerFeignClient powerFeignClient; @RequestMapping("feign") public R getFeignUser() { return powerFeignClient.getUser(); }
feign整合hystrix
- 配置feign.hystrix.enabled: true
- @EnableHystrix
- 定义降级方法
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@Component public class FallBackMethod implements PowerFeignClient { @Override public R getUser() { return R.error("getUser fail"); } }
-
Feign实现类 ````java @FeignClient(value = “SERVER-POWER”, fallback = FallBackMethod.class) public interface PowerFeignClient {
@RequestMapping(“user”) R getUser();
} ````
