package cn.itcast.order;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EntityScan("cn.itcast.order.entity")  //用来扫描和发现指定包及其子包中的Entity定义
public class OrderApplication {

    /**
     * 使用spring提供的RestTemplate发送http请求到商品服务
     * 1-创建RestTemplate对象交给容器管理
     * 2-在使用的时候,调用其方法完成操作(getXX,postXXX)
     */
    @LoadBalanced  //是ribbon提供的负载均衡的注解
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }

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

package cn.itcast.order.controller;

import cn.itcast.order.entity.Product;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;


@RestController
@RequestMapping("/order")
public class OrderController {

    //注入restTemplate
    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    //import org.springframework.cloud.client.discovery.DiscoveryClient;
    /**
     * 注入DiscoveryClient:springcloud提供的获取元数据的工具类,调用方法获取服务的元数据信息
     */
    private DiscoveryClient discoveryClient;

    /**
     *
     * @param id 商品id
     * @return
     * 通过订单系统,调用商品服务根据id查询商品信息
     *   1-需要配置商品服务
     *   2-需要调用商品服务
     */
    @RequestMapping(value = "/buy/{id}",method = RequestMethod.GET)
    public Product findById(@PathVariable Long id){
        Product product = null;
        //根据元数据的主机地址和端口号拼接请求微服务的URL
        product = restTemplate.getForObject("http://service-product/product/1",Product.class);
        return product;
    }
}

package cn.itcast.product.controller;

import cn.itcast.product.entity.Product;
import cn.itcast.product.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/product")
public class ProductController {

    @Autowired
    private ProductService productService;

    @Value("${server.port}")
    private String port;

    @Value("${spring.cloud.client.ip-address}")
    private String ip;

    @RequestMapping(value = "/{id}",method = RequestMethod.GET)
    public Product findById(@PathVariable Long id){
        Product product = productService.findById(id);
        product.setProductName("访问的服务地址:"+ip+":"+port);
        return product;
    }

    @RequestMapping(value = "",method = RequestMethod.POST)
    public String save(@RequestBody Product product){
        productService.save(product);
        return "保存成功";
    }
}