2.SpringCloud简单搭建--服务提供方和消费方（rest+ribbon）(Finchley版本)

创建一个服务提供者 (eureka client)

1. 创建一个订单服务作为服务提供者

新建一个模块order-service

pom.xml如下

    
        SpringCloud
        com.tp.demo
        1.0-SNAPSHOT
    
    4.0.0

    order-service
    1.0-SNAPSHOT
    jar

    order-service
    Demo project for Spring Boot

    
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        
        
            org.springframework.boot
            spring-boot-starter-web
        
    

 

2.创建启动类OrderServiceApplication加注解@EnableEurekaClient表明这是一个eureka的客户端

package com.tp.demo;

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

/**
 * @Author: pengtao
 * @Date: 2019/3/27/0027 16:27
 * @Version: 1.0
 */

@SpringBootApplication
@EnableEurekaClient
public class OrderServiceApplication {
	public static void main(String[] args) {
		SpringApplication.run(OrderServiceApplication.class, args);
	}
}

 

3.新建一个包controller, 建一个controller类OrderController 

package com.tp.demo.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author: pengtao
 * @Date: 2019/3/27/0027 16:40
 * @Version: 1.0
 */

@RestController
public class OrderController {

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

	@RequestMapping("/order")
	public String query() {
		return "i'm order service, port=[" + port + "]";
	}

}

4.创建application.yml

server:
  port: 8762

spring:
  application:
    name: order-service

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

5.启动启动类

6.访问order服务

7. 修改application.yml的端口为8763, 把idea的单例启动勾去掉

这里去掉后可以启动多个，端口修改为8763后再次启动，看到又一个order服务端口为8763

访问以下没问题

8. 我们新建一个模块，用户服务来作为服务消费方，来调用服务提供方订单服务

新建一个模块名user-service

    
        SpringCloud
        com.tp.demo
        1.0-SNAPSHOT
    
    4.0.0

    user-service


    
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-ribbon
        
    

 

9.新建启动类UserServiceApplication

package com.tp.demo;

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;

/**
 * @Author: pengtao
 * @Date: 2019/3/27/0027 16:27
 * @Version: 1.0
 */

@SpringBootApplication
@EnableEurekaClient
public class UserServiceApplication {
	public static void main(String[] args) {
		SpringApplication.run(UserServiceApplication.class, args);
	}

	@Bean
	@LoadBalanced
	RestTemplate getRestTemplate() {
		return new RestTemplate();
	}
}

 

新建一个servie

package com.tp.demo.service;

/**
 * @Author: pengtao
 * @Date: 2019/3/27/0027 17:27
 * @Version: 1.0
 */
public interface UserService {

	/**
	 * fetch data by rule id
	 *
	 * @param
	 * @return Result
	 */
	String callOrder();
}

 

实现这个接口

package com.tp.demo.service.impl;

import com.tp.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

/**
 * @Author: pengtao
 * @Date: 2019/3/27/0027 17:28
 * @Version: 1.0
 */
@SuppressWarnings("All")
@Service
public class UserServiceImpl implements UserService {

	private final String ORDER_URL = "http://ORDER-SERVICE/order";

	@Autowired
	private RestTemplate restTemplate;

	@Override
	public String callOrder() {
		return restTemplate.getForObject(ORDER_URL, String.class);
	}
}

 

提供一个controller

package com.tp.demo.controller;

import com.tp.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * @Author: pengtao
 * @Date: 2019/3/27/0027 16:40
 * @Version: 1.0
 */

@RestController
public class UserController {

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

	@RequestMapping("/user")
	public String query() {
		return "i'm user service, port=[" + port + "]";
	}

	@Autowired
	private UserService userService;

	@RequestMapping("/callUserService")
	public String callUser() {
		return userService.callOrder();
	}

}

 

10.配置application.yml

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
server:
  port: 8764
spring:
  application:
    name: user-service

11.启动用户服务

 

此时的结构如下