Spring Cloud入门系列（三）——服务注册与发现之Eureka

新增服务消费者80

ApplicationContextConfig

package com.banana.springcloud.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @author layman
 * @description: 配置类
 * @date 2021/1/9
 */
@Configuration
public class ApplicationContextConfig {
    
    
    /**
     * Configuration注解：定义配置类，可替换xml配置文件，被注解的类内部包含有一个或多个被@Bean注解的方法，
     *      这些方法将会被AnnotationConfigApplicationContext或AnnotationConfigWebApplicationContext类进行扫描，
     *      并用于构建bean定义，初始化Spring容器
     * LoadBalanced注解:可以使RestTemplate在请求时拥有客户端负载均衡的能力，只有加上，才能通过微服务名称调用服务
     * @return RestTemplate ：rest微服务请求的模板类
     */
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
    
    
        return  new RestTemplate();
    }
}

OrderController

package com.banana.springcloud.controller;

import com.banana.springcloud.entity.CommonResult;
import com.banana.springcloud.entity.Payment;
import com.banana.springcloud.loadbalancer.MyLoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @author layman
 * @description: 消费者controller
 * @date 2021/1/9
 */
@RestController
@Slf4j
@RequestMapping("/consumer/payment")
public class OrderController {
    
    

    //服务调用地址
    private static final String PAYMENT_URL = "http://cloud-payment-service";
    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/create")
    public CommonResult<Payment> create(Payment payment){
    
    
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }
    @GetMapping("/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id){
    
    
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }

OrderMain80

package com.banana.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.ribbon.RibbonClient;

/**
 * @author layman
 * @description: TODO
 * @date 2021/1/9
 */
@SpringBootApplication
@EnableEurekaClient
public class OrderMain80 {
    
    
    public static void main(String[] args) {
    
    
            SpringApplication.run(OrderMain80.class,args);
        }
}

appliction.yml

server:
  port: 80

eureka:
  client:
    #是否将自己注册到注册中心, 默认true
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息,单机无所谓,集群必须设置为true配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka  #单机版(将payment8001注册到7001)
    # defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

spring:
  application:
    name: cloud-order-service

启动服务消费者80

刷新Eureka服务端。

可以看到 cloud-order-service 成功注册到7001 Eureka服务端。

Eureka集群

集群配置：略（无非就是你注册我，我注册你，非常简单。）