微服务调用方式

1.使用restTemplate：缺点：url硬编码，无法实现负载均衡

@SpringBootApplication
@MapperScan("cn.wolfcode.mapper")
public class OrderServer {
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
    public static void main(String[] args) {
        SpringApplication.run(OrderServer.class,args);
    }
}

@Autowired
private RestTemplate restTemplate;

@Override
public Order createOrder(Long pid, Long uid) {
    Order order = new Order();
    order.setUid(1L);
    order.setUsername("jiage");
    //远程调用
    String url="http://localhost:8081/products/1";
    Product product=restTemplate.getForObject(url,Product.class);
    order.setPid(pid);
    order.setProductName(product.getName());
    order.setProductPrice(product.getPrice());
    order.setNumber(1);
    super.save(order);
    return order;
}
2.nacos注册

启动命令startup.cmd -m standalone

多集群部署

 

 

 

 

 

 

List<ServiceInstance> instances = discoveryClient.getInstances("product-service");
ServiceInstance serviceInstance = instances.get(0);
String url = "http://" + serviceInstance.getHost() + ":" + serviceInstance.getPort() + "/products/" + pid;
Product product=restTemplate.getForObject(url,Product.class);

 自定义负载均衡

3.手动负载均衡

4.ribbon

 

 

 

5.feign