前言：
开发工具：IntelliJ IDEA 2020版 (Ultimate Edition)
框架：spring boot 、spring cloud
搭建一套spring cloud微服务系统，实现服务之间的调用。
需要搭建一个父工程springcloud-test，一个服务注册中心eureka-server，两个微服务cloud-client,cloud-provider。
两个微服务均注册到服务注册中心。
一.搭建父项目
（1）删掉src目录
（2）定义pom.xml文件
`
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.4.1
com.chen.test
springcloud-test
1.0-SNAPSHOT
pom
UTF-8
UTF-8
1.8
`
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二.搭建eureka-server注册中心
1.
6.
（1）定义pom.xml文件
`
4.0.0
com.chen.test
springcloud-test
1.0-SNAPSHOT
com.chen.test
eureka-server
0.0.1-SNAPSHOT
jar
eureka-server
Demo project for Spring Boot
UTF-8
UTF-8
1.8
2020.0.0
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-server
org.springframework.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-dependencies
${spring-cloud.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
spring-milestones
Spring Milestones
https://repo.spring.io/milestone
`
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（2）删掉test文件夹（自己设置，可有可无）
（3）启动加注解@EnableEurekaServer(开启eureka服务)
`package com.chen.test.eurekaserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}`
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(4)定义配置文件
配置文件改为application.yml(可有可无，看自己喜好)
`server:
port: 8080
spring:
application:
#应用名称（在注册中显示的）
name: eureka-server
eureka:
client:
#此客户端是否获取eureka服务器注册表上的注册信息，默认为true
fetch-registry: false
#实例是否在eureka服务器上注册自己的信息以供其他服务发现，默认为true,即自己注册自己。
register-with-eureka: true
#与Eureka注册服务中心的通信zone和url地址
serviceUrl:
#http://localhost:8080/eureka/eureka
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka
#服务注册中心实例的主机名
instance:
hostname: 127.0.0.1
prefer-ip-address: true
instance-id: 127.0.0.1:8080
server:
#设为false，关闭自我保护，即Eureka server在云心光器件会去统计心跳失败比例在15分钟之内是否低于85%,如果低于85%，EurekaServer
#会将这些事例保护起来，让这些事例不会过期，但是在保护器内如果刚哈这个服务提供者非正常下线了，此时服务消费者会拿到一个无效的服务
#实例，此时调用会失败，对于这个问题需要服务消费者端有一些容错机制，如重试、断路器等；
enable-self-preservation: false
#扫描失效服务的间隔时间（单位是毫秒，摩恩是60*1000)，即60s
eviction-interval-timer-in-ms: 10000`
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(5)测试
6.
（1）定义pom.xml文件
`
4.0.0
com.chen.test
springcloud-test
1.0-SNAPSHOT
com.chen.test
cloud-provider
0.0.1-SNAPSHOT
jar
cloud-provider
Demo project for Spring Boot
UTF-8
UTF-8
1.8
2020.0.0
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
org.springframework.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-dependencies
${spring-cloud.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
spring-milestones
Spring Milestones
https://repo.spring.io/milestone
`
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(2)删除test文件加（可有可无）
(3)修改配置文件为application.yml(可有可无)
`spring:
application:
name: cloud-provider
server:
port: 8081
eureka:
client:
#此客户端是否获取eureka服务器注册表上的注册信息，默认为true
fetch-registry: false
#实例是否在eureka服务器上注册自己的信息以供其他服务发现，默认为true,即自己注册自己。
register-with-eureka: true
service-url:
#defaultZone 这个是不会提示的，此处需要自己写
#实际上属性应该是service-url,这个属性是个map（key-value）格式；当key是defaultZone的时候才能被解析；所以这里没有提示，
#但是自己还需要写一个defaultZone；
defaultZone: http://localhost:8080/eureka
#服务注册中心实例的主机名
instance:
hostname: 127.0.0.1
prefer-ip-address: true
instance-id: 127.0.0.1:8081`
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（4）启动类加注解@EnableEurekaClient
`package com.chen.test.cloudprovider;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class CloudProviderApplication {
public static void main(String[] args) {
SpringApplication.run(CloudProviderApplication.class, args);
}
}`
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(5)测试
（1）定义pom.xml文件
`
4.0.0
com.chen.test
springcloud-test
1.0-SNAPSHOT
com.chen.demo
cloud-client
0.0.1-SNAPSHOT
jar
cloud-client
Demo project for Spring Boot
UTF-8
UTF-8
1.8
2020.0.0
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.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-dependencies
${spring-cloud.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
spring-milestones
Spring Milestones
https://repo.spring.io/milestone
`
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(2)删除test文件夹(可有可无)
(3)修改配置文件为application.yml(可有可无)
`server:
#定义端口号
port: 8082
spring:
application:
#定义应用名称，即服务名称
name: cloud-client
eureka:
client:
service-url:
defaultZone: http://localhost:8080/eureka
#服务注册中心实例的主机名
instance:
hostname: 127.0.0.1
prefer-ip-address: true
instance-id: 127.0.0.1:8082`
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(4)启动类加注解@EnableEurekaClient
`package com.chen.demo.cloudclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class CloudClientApplication {
public static void main(String[] args) {
SpringApplication.run(CloudClientApplication.class, args);
}
}`
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(5)测试
（6）在父pom中加上
`
eureka-server
cloud-provider
cloud-client
`
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五.实现服务之间的调用
1.在cloud-provider中创建controller包和service包
`package com.chen.test.cloudprovider.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.chen.test.cloudprovider.service.HelloService;
@RestController
@RequestMapping("/hello")
public class HelloController {
@Autowired
private HelloService helloService;
@GetMapping("/getHello")
public String getHello(){
return helloService.getHello();
}
}`
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`package com.chen.test.cloudprovider.service;
public interface HelloService {
String getHello();
}`
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`package com.chen.test.cloudprovider.service.impl;
import com.chen.test.cloudprovider.service.HelloService;
import org.springframework.stereotype.Service;
@Service
public class HelloServiceImpl implements HelloService {
@Override
public String getHello() {
return "你好兄弟";
}
}`
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(2)测试
（3）在cloud-client中创建controller包和service包
`package com.chen.demo.cloudclient.controller;
import com.chen.demo.cloudclient.service.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@RestController
@RequestMapping("/Hello")
public class HelloClient {
@Autowired
private HelloService helloService;
@GetMapping("/getClient")
public String getClient(){
return helloService.getProduct();
}
}`
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`package com.chen.demo.cloudclient.service;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
//name 为product项目中application.yml配置文件中的application.name;
//path 为product项目中application.yml配置文件中的context.path;
@FeignClient(name = "cloud-provider",path ="/hello" )
//@Componet注解最好加上，不加idea会显示有错误，但是不影响系统运行；
@Component
public interface HelloService {
@RequestMapping(value = "getHello")
String getProduct();
}`
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特别注意
在启动类加上注解@EnableFeignClients
`package com.chen.demo.cloudclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class CloudClientApplication {
public static void main(String[] args) {
SpringApplication.run(CloudClientApplication.class, args);
}
}`
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（4）测试