springcloud服务消费端ribbon方式之从消费端到注册中心-04

港控/mmm° 2022-03-28 07:14 181阅读 0赞

[springcloud入门详细搭建微服务环境-01][springcloud_-01][ ][Link 1]

[springcloud服务提供端-02][Link 1]

此服务消费端的搭建是在以上的基础上：

### 1.导入依赖jar包 ###

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-config</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-ribbon</artifactId>
            </dependency>

### 2.写一个服务消费端的入口类 ###

package cn.mesmile;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    
    /**
     * @Created with IDEA
     * @author: Super Zheng
     * @Description: java类作用描述
     * @Date:2019/1/6
     * @Time:15:59
     */
    @SpringBootApplication
    @EnableEurekaClient
    public class ConsumerApplication {
        public static void main(String[] args) {
            SpringApplication.run(ConsumerApplication.class);
        }
    }

### 3.写一个config类，可以配置 负载均衡 方式 ###

package cn.mesmile.config;
    
    import com.netflix.loadbalancer.IRule;
    import com.netflix.loadbalancer.RandomRule;
    import com.netflix.loadbalancer.RoundRobinRule;
    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;
    
    /**
     * @Created with IDEA
     * @author: Super Zheng
     * @Description: java类作用描述
     * @Date:2019/1/6
     * @Time:16:00
     */
    @Configuration
    public class MyConfig {
    
        /**
         * @LoadBalanced 负载均衡
         * @return
         */
        @Bean
        @LoadBalanced
        public RestTemplate getRestTemplate(){
            return new RestTemplate();
        }
    
        /**
         * 修改负载均衡策略，默认为轮循
         * @return
         */
        @Bean
        public IRule myRule(){
            // 随机
    //        return new RandomRule();
            // 轮循
            return new RoundRobinRule();
        }
    }

###  4.写一个controller类来消费服务 ###

package cn.mesmile.controller;
    
    import cn.mesmile.User;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * @Created with IDEA
     * @author: Super Zheng
     * @Description: java类作用描述
     * @Date:2019/1/6
     * @Time:16:02
     */
    @RestController
    @RequestMapping("/consumer")
    public class ConsumerController {
    
        @Autowired
        private RestTemplate restTemplate;
    
        @RequestMapping("/user/{id}")
        public User getUser(@PathVariable(name = "id") Long id){
            // 通过注册中心中，服务端的别名来访问，服务端的别名是在服务端配置文件中配置的
            String url = "http://USER-PROVIDER/provider/user/"+id;
            return restTemplate.getForObject(url, User.class);
        }
    }

### 5.写服务消费端的配置 ###

server:
      port: 9002
    eureka:
      client:
        service-url:
         #defaultZone: http://localhost:7001/eureka #告诉服务提供者要把服务注册到哪里
         defaultZone: http://eureka-7001.com:7001/eureka,http://eureka-7002.com:7002/eureka #集群环境下的配置
      instance:
        prefer-ip-address: true #显示客户端ip
    spring:
      application:
        name: USER-CONSUMER #不要使用下划线

### 6.启动注册中心入口类，启动服务提供端入口类，启动服务消费端入口类 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1cHJlemhlbmc_size_16_color_FFFFFF_t_70][]

[springcloud_-01]: https://blog.csdn.net/suprezheng/article/details/86107570
[Link 1]: https://blog.csdn.net/suprezheng/article/details/86180847
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1cHJlemhlbmc_size_16_color_FFFFFF_t_70]: /images/20220328/eb0abeeba94c494898e8ce04f7f0c06c.png