Eureka&Ribbon

RestTemplate

    /**
     * 创建RestTemplate并注入Spring容器
     */
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

搭建Eureka服务器

0. maven坐标

        <!--eureka注册中心服务端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

1. yaml文件中配置Eureka

   server:
     port: 10086 #服务端口
   spring:
     application:
    name: eurekaserver #eureka服务的名字
   
   eureka:
     client:
    service-url: #eureka的地址信息
      defaultZone: http://localhost:10086/eureka

2. 服务端模块的启动类上开启eureka @EnableEurekaServer

package cn.itcast.eureka;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaApplication.class, args);
    }
}

客户端服务注册

0. 客户端依赖

        <!--eureka客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

1. yaml配置

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/cloud_order?useSSL=false
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
  application:
    name: orderservice #order服务(eureka)
eureka:
  client:
    service-url: #eureka的地址信息
      defaultZone: http://localhost:10086/eureka

userservice:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule #均衡负载策略

ribbon:
  eager-load:
    enabled: true
    clients: #指定开启饥饿加载的服务名称
      - userservice

userservice:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule #均衡负载策略

ribbon:
  eager-load:
    enabled: true
    clients: #指定开启饥饿加载的服务名称
      - userservice

使用template

        String url = "http://userservice/user/" + userId;//构建url 让temple访问
        User user = restTemplate.getForObject(url, User.class);//使用restTemplate发送请求