SpringCloud 服务 注册和调用

1. 新建Eureka服务

2. 新建服务提供者

3. 新建服务消费者（feign调用）

1.新建Eureka Server

pom

    org.springframework.boot
    spring-boot-starter-parent
    2.1.6.RELEASE


    1.8
    Greenwich.SR2



    org.springframework.cloud
    spring-cloud-starter-netflix-eureka-server



    org.springframework.boot
    spring-boot-devtools
    runtime
    true


    org.springframework.boot
    spring-boot-starter-test
    test



    
        
            org.springframework.cloud
            spring-cloud-dependencies
            ${spring-cloud.version}
            pom
            import
        
    

application.yml

server:
  port: 8761


spring:
  application:
    name: eureka-server
eureka:
  client:
    #是否将自己注册到eureka
    register-with-eureka: false
    #是否从eureka获取注册信息
    fetch-registry: false
    service-url:
      #设置与Eureka Server交互的地址
      defaultZone: http://127.0.0.1:${server.port}/eureka

启动项

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
//千万别导错包

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

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

至此 Eureka server 创建成功

2.服务提供者

pom

    org.springframework.boot
    spring-boot-starter-parent
    2.1.6.RELEASE


    1.8
    Greenwich.SR2


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



    org.springframework.boot
    spring-boot-starter-web


    
        
            org.springframework.cloud
            spring-cloud-dependencies
            ${spring-cloud.version}
            pom
            import
        
    

application.yml

server:
  port: 10100

spring:
  application:
    name: base
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka

启动项

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class BaseApplication {

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

模拟服务

@RestController
public class IndexController {
    @RequestMapping("/hello")
    public String index(@RequestParam String name){
        String msg = "Hello " + name + ", this time is " + System.currentTimeMillis();
        return msg;
    }
}

服务提者完成

3 .服务消费者 （feign）

pom

    org.springframework.boot
    spring-boot-starter-parent
    2.1.6.RELEASE


    1.8
    Greenwich.SR2


    org.springframework.boot
    spring-boot-starter-web


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


    org.springframework.cloud
    spring-cloud-starter-openfeign


    
        
            org.springframework.cloud
            spring-cloud-dependencies
            ${spring-cloud.version}
            pom
            import
        
    

application.yml

server:
  port: 10101
spring:
  application:
    name: customer
  main:
    allow-bean-definition-overriding: true
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka
feign:
  hystrix:
    enabled: true

启动项

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class CustomerApplication {

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

feign 接口

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@FeignClient(value = "base")
public interface Index {
    @RequestMapping(value = "/hello")
    public String hello(@RequestParam("name") String name);

}

value : 要调用的spring.application.name
@requestMapping 要调用的服务的地址，必须为完整路径，即使是GetMapping ,也必 须写成RequestMapping (Method=Get) 格式

调用

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

/**
 * Date: 2019/7/29
 * Author: POPPET
 * Description:
 */
@RestController
public class IndexController {

    @Autowired
    private Index index;

    @RequestMapping("hello/{name}")
    public String index(@PathVariable("name") String name){
        return index.hello(name);
    }
}

至此 服务调用结束

同时，eureka-server 注册中心，两个服务都注册了过去

如有疑问，欢迎指正。