SpringCloud（十八）自定义ribbon

       在上一篇文章 ​​SpringCloud（四） ribbon负载均衡 ​​中用的默认的负载均衡，这一篇文章讲解怎么配置负载均衡，怎么为某个微服务指定负载均衡。

1. 通过代码配置ribbon client

   写一个负载均衡规则的配置类。这个配置类如果在spring的管理下，就会变成全局的配置类，所以我把它放在了ComponentScan扫描范围外

package com.xhx.config;

import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.RandomRule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * xuhaixing
 * 2018/9/3 20:09
 *
 *  不放在ComponentScan下，否则会变成全局的，如果对单个微服务进行控制，就放在扫描的外面
 *
 **/
@Configuration
public class FooConfiguration {

    @Bean
    public IRule ribbonRule(IClientConfig config){
        return new RandomRule();
    }
}

 写了另一个配置类，指定哪个服务应用上面设置的规则。这个要在spring管理下

package com.xhx.springcloud.config;

import com.xhx.config.FooConfiguration;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.context.annotation.Configuration;

/**
 * xuhaixing
 * 2018/9/3 19:53
 **/
@Configuration
@RibbonClient(name = "eureka-service2",configuration = FooConfiguration.class)
public class TestConfiguration {
}

注入RestTemplate

package com.xhx.springcloud.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;

/**
 * xuhaixing
 * 2018/6/3 16:24
 */
@Configuration
public class RibbonConfig {


    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

两个测试的请求，一个请求service1，默认的策略，，另一个请求service2，随机的策略

package com.xhx.springcloud.controller;

import com.netflix.discovery.converters.Auto;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * xuhaixing
 * 2018/6/3 16:27
 */
@RestController
public class RibbionController {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value = "getName")
    public String getName(String name){
        return restTemplate.getForObject("http://eureka-service/hello/getName?name="+name,String.class);
    }

    @RequestMapping(value = "getName2")
    public String getName2(String name){
        return restTemplate.getForObject("http://eureka-service2/hello/getName?name="+name,String.class);
    }
}

起了如下工程，两个service是服务的，一个client是测试用的客户端

这样就可以了

2.  通过配置文件配置

Starting with version 1.2.0, Spring Cloud Netflix now supports customizing Ribbon clients by setting properties to be compatible with the ​​Ribbon documentation​​.

This lets you change behavior at start up time in different environments.

The following list shows the supported properties>:

• ​​<clientName>.ribbon.NFLoadBalancerClassName​​​: Should implement​​ILoadBalancer​​
• ​​<clientName>.ribbon.NFLoadBalancerRuleClassName​​​: Should implement​​IRule​​
• ​​<clientName>.ribbon.NFLoadBalancerPingClassName​​​: Should implement​​IPing​​
• ​​<clientName>.ribbon.NIWSServerListClassName​​​: Should implement​​ServerList​​
• ​​<clientName>.ribbon.NIWSServerListFilterClassName​​​: Should implement​​ServerListFilter​​

#通过配置文件方式配置自定义ribbon client
eureka-service:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

请求eureka-service这个微服务时，就会使用随机策略了

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