SpringCloud（十八）自定义ribbon

缺乏、安全感 2022-05-14 07:42 184阅读 0赞

在上一篇文章 **[SpringCloud（四） ribbon负载均衡 ][SpringCloud_ ribbon_]**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

![70][]

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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[SpringCloud_ ribbon_]: https://blog.csdn.net/u012326462/article/details/80581602
[70]: /images/20220514/db6af706d09046a5846b208db78eec1f.png
[Ribbon documentation]: https://github.com/Netflix/ribbon/wiki/Working-with-load-balancers#components-of-load-balancer
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70]: /images/20220514/36746f94a12c48489c0597d7957e0197.png