SpringCloud微服务创建与学习之Ribbon与Feign

前夕

SpringCloud微服务创建与学习之Eureka

1. Ribbon 1.1 按照2.2.1创建新Model，创建spring_cloud_eureka_ribbon工程。 1.2 pom.xml

    
        SpringCloudLearn
        org.ccit
        1.0-SNAPSHOT
    
    4.0.0

    org.ccit.SPringCloudLearn
    spring_cloud_eureka_ribbon
    
        
            org.springframework.cloud
            spring-cloud-starter-eureka
        
        
            org.springframework.cloud
            spring-cloud-starter-ribbon
        
        
            org.springframework.cloud
            spring-cloud-starter-hystrix
        
        
            org.springframework.boot
            spring-boot-starter-web
        

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

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

1.3 application.yml

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

1.4 org.ccit.learn.config.RibbonConfig.class

package org.ccit.learn.config;

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

@Configuration
public class RibbonConfig {
    @Bean
    @LoadBalanced
    RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

1.5 org.ccit.learn.service.RibbonService.class

package org.ccit.learn.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class RibbonService {
    @Autowired
    private RestTemplate restTemplate;

    public String hi(String name){
       return restTemplate.getForObject("http://eureka-client/hi?name="+name,String.class);
    }
}

1.6 Org.ccit.learn.controller.RibbonController.class

ackage org.ccit.learn.controller;

import org.ccit.learn.service.RibbonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class RibbonController {
    @Autowired
    private RibbonService ribbonService;

    @GetMapping("/hi")
    public String hi(@RequestParam("name") String name){
        return ribbonService.hi(name);
    }
}

1.7 SpringCloudEurekaRibbonClient

package org.ccit.learn;

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


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

1.8 运行结果

2.Feign 2.1在父模块下创建spring_cloud_eureka_feign_client工程。 2.2 pom.xml

    
        SpringCloudLearn
        org.ccit
        1.0-SNAPSHOT
    
    4.0.0

    org.ccit.SpringCloudLearn
    spring_cloud_eureka_feign_client
    

        
            org.springframework.cloud
            spring-cloud-starter-feign
        

        
            com.netflix.feign
            feign-httpclient
            RELEASE
        

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

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

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

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

2.3 创建EurekaClientFeign接口

package org.ccit.learn.feign;

import org.ccit.learn.config.FeignConfig;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;



@FeignClient(value = "eureka-client",configuration = FeignConfig.class)
public interface EurekaClientFeign {
    @GetMapping(value = "/hi")
    String sayHiFromClientEureka(@RequestParam(value = "name") String name);
}

2.4 创建FeignConfig配置类

package org.ccit.learn.config;

import feign.Retryer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import static java.util.concurrent.TimeUnit.SECONDS;


@Configuration
public class FeignConfig {
    @Bean
    public Retryer feignRetryer(){
        return new Retryer.Default(100,SECONDS.toMicros(1),5);
    }
}

2.5 创建HiService

package org.ccit.learn.service;

import org.ccit.learn.feign.EurekaClientFeign;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class HiService {
    @Autowired
    private EurekaClientFeign eurekaClientFeign;

    public String sayHi(String name){
        return eurekaClientFeign.sayHiFromClientEureka(name);
    }
}

2.6 创建HiController

package org.ccit.learn.controller;

import org.ccit.learn.service.HiService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HiController {
    @Autowired
    private HiService hiService;

    @GetMapping("/hi")
    public String sayHi(@RequestParam("name") String name){
        return hiService.sayHi(name);
    }
}

2.7 启动类

package org.ccit.learn;

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


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

2.8 运行结果