Eureka（三）：服务拉取

Eureka服务消费者通过注册中心获取服务列表并调用

1、引入依赖

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>3.1.0</version>
        </dependency>

2、新建启动类

@Bean
@LoadBalanced 负载均衡，默认轮询方式

package cn.badianboke.order;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableEurekaClient
@MapperScan("cn.badianboke.order.mapper")
@SpringBootApplication
public class OrderApplication {

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

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

}
`

3、配置

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

4、service配置

http://localhost:8081 变为 http://userservice/user

package cn.badianboke.order.service;

import cn.badianboke.order.mapper.OrderMapper;
import cn.badianboke.order.pojo.Order;
import cn.badianboke.order.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class OrderService {
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private RestTemplate restTemplate;

    public Order queryOrderById(Long orderId) {
        // 1.查询订单
        Order order = orderMapper.findById(orderId);

        //String url = "http://localhost:8081/user/" + order.getUserId();
        String url = "http://userservice/user/" + order.getUserId();

        User user = restTemplate.getForObject(url, User.class);

        order.setUser(user);
        // 4.返回
        return order;
    }
}