springcloud微服务简单搭建

一、搭建注册中心

1、创建一个demo项目，demo点击右键创建module

2、设置项目参数

3、选择spring cloud discovery，一直下一步，最后点击完成，创建注册中心

4、将application.properties文件修改为application.yml（格式比较清晰），复制下面参数

server:
  port: 8001 # 服务端口

eureka:
  instance:
    hostname: localhost # 设置主机名
  client:
    registerWithEureka: false # 是否向 Eureka 注册服务。该应用为服务注册中心，不需要自注册，设置为 false
    fetchRegistry: false # 是否检索服务。该应用为服务注册中心，职责为注册和发现服务，无需检索服务，设置为 false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ # 注册中心url
spring:
  application:
    name: eurka-server  #服务名称

5、在项目启动类中添加@EnableEurekaServer注解

6、启动项目访问http://localhost:8001/，8001是配置文件中设置的端口号

spring cloud的消费者也可以是提供者，二者只有逻辑上的区别，在spring boot中有两种消费方式：rest+ribbon和Feign

二、spring cloud提供者（rest+ribbon）

1、同理，新建module

2、创建ribbon，不要忘记将spring cloud discovery也勾选上，否则将缺少jar包，一部分注解不显示

3、application.yml配置文件

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8001/eureka/
server:
  port: 8002
spring:
  application:
    name: ribbon-provider

4、启动类添加@EnableEurekaClient注册服务，然后注入RestTemplate对象，@LoadBalanced表示开启负载均衡

package com.cloud.ribbonprovider;

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;

@SpringBootApplication
@EnableEurekaClient
public class RibbonProviderApplication {

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

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

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5、创建controller和service

package com.cloud.ribbonprovider.controller;

import com.cloud.ribbonprovider.service.ProviderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ProviderController {

    @Autowired
    ProviderService providerService;

    @GetMapping(value = "/index")
    public String index() {
        return providerService.getProvider();
    }
}

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package com.cloud.ribbonprovider.service;

import org.springframework.stereotype.Service;

@Service
public class ProviderService {

    public String getProvider() {
        return "ribbon provider";
    }
}

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6、启动项目，访问提供者http://localhost:8002/index，可以看到返回结果，接着创建消费者来获取提供者的内容

三、spring cloud消费者（rest+ribbon）

1、新建module

2、勾选ribbon，步骤同提供者

3、application.yml配置文件

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8001/eureka/
server:
  port: 8003
spring:
  application:
    name: ribbon-consumer

4、启动类配置

package com.cloud.ribbonconsumer;

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;

@SpringBootApplication
@EnableEurekaClient
public class RibbonConsumerApplication {

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

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

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5、controller和service，注意service需要注入RestTemplate，用来访问提供者

package com.cloud.ribbonconsumer.controller;

import com.cloud.ribbonconsumer.service.ConsumerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ConsumerController {

    @Autowired
    ConsumerService consumerService;

    @GetMapping(value = "/index")
    public String index() {
        return "ribbon consumer/ " + consumerService.getConsumer();
    }
}

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package com.cloud.ribbonconsumer.service;

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

@Service
public class ConsumerService {

    @Autowired
    RestTemplate restTemplate;

    public String getConsumer() {
        return restTemplate.getForObject("http://ribbon-provider/index", String.class);
    }
}

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6、启动项目，访问消费者http://localhost:8003/index，在返回的结果中，ribbon consumer/属于消费者自身的信息，ribbon provider属于提供者提供的内容，简单的springcloud搭建成功

7、访问注册中心http://localhost:8001/，可以看的提供者和消费者都已经注册成功

四、Feign消费

1、新建module，勾选openfeign

2、application.yml配置文件

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8001/eureka/
server:
  port: 8004
spring:
  application:
    name: feign-consumer

3、启动类添加@EnableDiscoveryClient和@EnableFeignClients注解

package com.cloud.feign;

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 FeignApplication {

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

}

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4、使用feign调用ribbon-consumer（既是消费者也是提供者），添加@FeignClient注解即可，value的意思就是目标服务器，可以直接用yml中配置的application名称

package com.cloud.feign.feignrpc;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(value = "ribbon-consumer")
public interface GetFeign {

    @GetMapping(value = "index")
    public String getFeign();
}

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5、创建controller和service，service中注入feign的接口

package com.cloud.feign.service;

import com.cloud.feign.feignrpc.GetFeign;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class FeignService {

    @Autowired
    GetFeign getFeign;

    public String getFeign() {
        return getFeign.getFeign();
    }
}

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package com.cloud.feign.controller;

import com.cloud.feign.service.FeignService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class FeignController {

    @Autowired
    FeignService feignService;

    @GetMapping(value = "/feign/index")
    public String getFeign() {
        return "feign consumer/ " + feignService.getFeign();
    }
}

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6、启动项目，访问feign消费者http://localhost:8004/feign/index，其中feign consumer/是feign自身提供的信息，ribbon consumer/ ribbon provider是ribbon consumer提供者的信息

7、再次查看注册中心

到此，简单的微服务构架搭建完成。

springcloud微服务简单搭建

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