eurek

(1)搭建eureka注册中心

1.引入eureka注册中心的依赖

pom
<dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

2.编写启动类添加@EnableEurekaServer注解

3.添加application.yml文件

config
server:
  port: 10086
spring:
  application:
    name: eurekaserver
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:10086/eureka

(2)注册服务(user-server)

1.在user-server服务中引入依赖

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

2.在user-sever的application.yml中添加配置

config
spring:
  application:
    name: userservice
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:10086/eureka

3.启动全部服务查看eureka中是否显示

(3)在order-server中实现服务拉取

1.使用服务名称代替服务ip和端口

java
@GetMapping("{orderId}")
    public Order queryOrderByUserId(@PathVariable("orderId") Long orderId) {
        // 根据id查询订单并返回
        Order order = orderService.queryOrderById(orderId);
        // 利用RestTemplate发送http请求
        String url = "http://userservice/user/"+order.getUserId();
        User user = restTemplate.getForObject(url, User.class);
        // 封装User
        order.setUser(user);
        return order;
    }

2.实现负载均衡

java
@MapperScan("cn.itcast.order.mapper")
@SpringBootApplication
public class OrderApplication {

    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }

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