springcloud 第1课 :Rest学习环境搭建—服务提供者
springcloud 第2课 :Rest学习环境搭建—服务消费者
springcloud 第3课 :Eureka是什么
springcloud 第4课 :Eureka服务注册、信息配置、自我保护机制
springcloud 第5课 :Eureka集群环境配置
Ribbon是什么?
Ribbon是Netflix发布的云中间层服务开源项目,其主要功能是提供客户端实现负载均衡算法。Ribbon客户端组件提供一系列完善的配置项如连接超时,重试等。简单的说,Ribbon是一个客户端负载均衡器,我们可以在配置文件中Load Balancer后面的所有机器,Ribbon会自动的帮助你基于某种规则(如简单轮询,随机连接等)去连接这些机器,我们也很容易使用Ribbon实现自定义的负载均衡算法。
实现负载均衡方式1:通过服务器端实现负载均衡(nginx)
实现负载均衡方式2:通过客户端实现负载均衡(ribbon)
1、负载均衡和Ribbon案例
便于理解,消费者目录结构图如下
1.1、将ribbon和eureka配置到客户端
导入ribbon和eureka的pom依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>demo1</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>springcloud-consumer-dept-80</artifactId>
<dependencies>
<!--Ribbon,负责负载均衡-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
<version>1.4.7.RELEASE</version>
</dependency>
<!--加入eureka依赖,负责注册与发现-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
<version>1.4.6.RELEASE</version>
</dependency>
<!--实体类-->
<dependency>
<groupId>org.example</groupId>
<artifactId>springcloud-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<!--web启动器-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
</dependencies>
</project>
1.2、配置eureka,实现负载均衡
application.yaml 配置eureka,消费者可以随机的从3个eureka注册中心消费服务
server:
port: 80
#eureka配置
eureka:
client:
register-with-eureka: false #消费者不向eureka中心注册自己,只消费不提供服务,生产者才负责提供服务
service-url: #消费者可以随机的到这3个eureka注册中心消费,达到负载均衡的效果
defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
1.3、配置类添加ribbon的负载均衡注解
package com.lian.springcloud.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 ConfigureBean {
//配置负载均衡实现RestTemplate,ribbon的作用
@LoadBalanced //ribbon,基于客户端实现负载均衡
@Bean
public RestTemplate restTemplate(){
return new RestTemplate();
}
}
1.4、controller层配置 String REST_URL_PREFIX
package com.lian.springcloud.controller;
import com.lian.springcloud.pojo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import java.util.List;
@RestController
public class DeptConsumerController {
/**
* 1、消费者,不应该有service层
* 2、RestTemplate 供我们直接调用即可,注册到Spring容器中,由配置类注入spring容器
* ( url,实体:用map封装,Class<T> responseType )
*/
@Autowired
RestTemplate restTemplate;
//未加Ribbon之前,客户端访问的是固定的某个端口,这样会导致机器压力较大,不能给多台机器合理分配任务量
//private static final String REST_URL_PREFIX = "http://localhost:8001";
/**
* 客户端访问的是某一个服务里面的多个随机的端口,根据IRule类,可根据权重等值来进行轮询,达到负载均衡的作用
*/
private static final String REST_URL_PREFIX = "http://SPRINGCLOUD-PROVIDER-DEPT";
@RequestMapping("/consumer/dept/get/{id}")
public Dept get(@PathVariable("id") Long id){
return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
}
@RequestMapping("/consumer/dept/list")
public List<Dept> list(){
return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list",List.class);
}
@RequestMapping("/consumer/dept/add")
public boolean add(Dept dept){
return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add",dept,Boolean.class);
}
}
1.5、主启动启动
package com.lian.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@EnableEurekaClient
@SpringBootApplication
public class DeptConsumer_80 {
public static void main(String[] args) {
SpringApplication.run(DeptConsumer_80.class,args);
}
}
2、使用Ribbon实现负载均衡
1、创建3个相同的数据库,这里我直接复制第一个数据库演示
CREATE TABLE `dept1` (
`deptno` int(11) NOT NULL AUTO_INCREMENT,
`dname` varchar(255) DEFAULT NULL,
`dbsource` varchar(255) DEFAULT NULL,
PRIMARY KEY (`deptno`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
insert into dept (deptno,dname,dbsource) VALUES (1,'开发部','db01');
insert into dept (deptno,dname,dbsource) VALUES (1,'策划部','db01');
insert into dept (deptno,dname,dbsource) VALUES (1,'美术部','db01');
insert into dept (deptno,dname,dbsource) VALUES (1,'招聘部','db01');
2、创建3个生产者
复制生产者8001,生成生产者8002和8003,修改数据库名和端口名、实例id名、主启动类即可
2.1、导入pom依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>springcloud-provider-dept-8001</artifactId>
<dependencies>
<!--我们需要拿到实体类,所以需要配置 api 模块-->
<dependency>
<groupId>org.example</groupId>
<artifactId>springcloud-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<!--junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!--druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
</dependency>
<!--logback日志门面-->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
</dependency>
<!--mybatis的springboot启动器-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<!--springboot的测试-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--jetty,当做应用服务器,和tomcat类似-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<!--热部署工具-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<!--加入eureka依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
<version>1.4.6.RELEASE</version>
</dependency>
<!-- actuator 完善监控信息-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>
</project>
2.2、复制resources
2.2.1、application.yaml
修改端口号、数据库名、instance-id
server:
port: 8001
#mybatis的配置
mybatis:
config-location: classpath:mybatis/mybatis-config.xml #mybatis核心配置文件
mapper-locations: classpath:mybatis/mapper/*.xml
type-aliases-package: com.lian.springcloud.pojo
#spring的配置
spring:
application:
name: springcloud-provider-dept #3个服务名称一致,但请求不同
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: org.gjt.mm.mysql.Driver
url: jdbc:mysql://localhost:3306/db?useUnicode=true&characterEncoding=utf-8
username: root
password: root
#eureka的配置,服务注册到哪里
eureka:
client:
service-url:
defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
instance:
instance-id: springcloud-provider-dept8001 #修改eureka页面的status描述
fetch-registry: false
#info配置
info:
app.name: lian-springcloud
company.name: msb
2.2.2、复制mybatis包
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<!--开启二级缓存-->
<setting name="cacheEnabled" value="true"/>
</settings>
</configuration>
DeptMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lian.springcloud.dao.DeptDao">
<insert id="addDept" parameterType="com.lian.springcloud.pojo.Dept">
insert into dept (dname,dbsource) values (#{dname},#{dbsource})
</insert>
<select id="queryById" parameterType="long" resultType="com.lian.springcloud.pojo.Dept">
select * from dept where deptno = #{deptno}
</select>
<select id="queryAll" resultType="com.lian.springcloud.pojo.Dept">
select * from Dept
</select>
</mapper>
2.3、复制java目录下的包
2.3.1、dao层
package com.lian.springcloud.dao;
import com.lian.springcloud.pojo.Dept;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* @Repository 托管给spring容器
* @Mapper 作用有3个:
* 1、把mapper这个DAO交給Spring管理
* 2、不再写mapper映射文件
* 3、编译之后会生成相应的接口实现类
*/
@Repository
@Mapper
public interface DeptDao {
boolean addDept(Dept dept);
Dept queryById(Long id);
List<Dept> queryAll();
}
2.3.2、DeptService接口
package com.lian.springcloud.service;
import com.lian.springcloud.pojo.Dept;
import java.util.List;
public interface DeptService {
boolean addDept(Dept dept);
Dept queryById(Long id);
List<Dept> queryAll();
}
2.3.3、DeptServiceImpl实现类
package com.lian.springcloud.service;
import com.lian.springcloud.dao.DeptDao;
import com.lian.springcloud.pojo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class DeptServiceImpl implements DeptService{
@Autowired
private DeptDao deptDao;
@Override
public boolean addDept(Dept dept) {
return deptDao.addDept(dept);
}
@Override
public Dept queryById(Long id) {
return deptDao.queryById(id);
}
@Override
public List<Dept> queryAll() {
return deptDao.queryAll();
}
}
2.3.4、controller层
package com.lian.springcloud.controller;
import com.lian.springcloud.pojo.Dept;
import com.lian.springcloud.service.DeptService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import java.util.List;
//通过restful服务
@Controller
public class DeptController {
@Autowired
private DeptService deptService;
//获取微服务信息
@Autowired
private DiscoveryClient client;
@GetMapping("/dept/list")
@ResponseBody
public List<Dept> queryAllDepts(){
return deptService.queryAll();
}
@GetMapping("/dept/get/{id}")
@ResponseBody
public Dept queryById(@PathVariable("id") Long id){
return deptService.queryById(id);
}
@PostMapping("/dept/add")
@ResponseBody
public void addDept(Dept dept){
deptService.addDept(dept);
}
//注册进来的微服务,获取一些消息
@GetMapping("/dept/discovery")
public Object discover(){
//获取微服务列表的清单
List<String> services = client.getServices();
System.out.println(services);
//得到一个具体的微服务信息,通过具体的微服务id,applicationname
List<ServiceInstance> instances = client.getInstances("SPRINGCLOUD-PROVIDER-DEPT");
for (ServiceInstance instance : instances) {
System.out.println(
instance.getHost()+"\t"+
instance.getPort()+"\t"+
instance.getUri()+"\t"+
instance.getServiceId()+"\t"
);
}
return this.client;
}
}
2.3.5、主启动类
类名修改为8002和8003
package com.lian.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
/**
* 主启动类
* 因为是maven项目,不是spring initialize项目,需要自己写主启动类
*
*/
@EnableDiscoveryClient //服务发现
@EnableEurekaClient //eureka是cs架构,配置此注解,在服务启动后,会自动注册到eureka服务端
@SpringBootApplication
public class DeptProvider_8001 {
public static void main(String[] args) {
SpringApplication.run(DeptProvider_8001.class,args);
}
}
3个eureka注册中心都有这3个生产者提供的服务
ribbon的默认算法就是轮询
3、自定义负载均衡算法
负载均衡算法有以下几种,默认是轮询
3.1、IRule类
public interface IRule{
public Server choose(Object key);
public void setLoadBalancer(ILoadBalancer lb);
public ILoadBalancer getLoadBalancer();
}
3.2、演示负载均衡—随机算法操作
自定义的负载均衡算法组件会覆盖默认的组件
3.2.1、消费者80在config类,将myRule默认轮询bean注入spring容器
package com.lian.springcloud.config;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.RandomRule;
import com.netflix.ribbon.Ribbon;
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 ConfigureBean {
//配置负载均衡实现RestTemplate,ribbon的作用
/**
* IRule
* RoundRobinRule 轮询,默认
* RandomRule 随机
* AvailabilityFilteringRule:会先过滤掉,跳闸,访问故障的服务,对剩下的进行轮询
* RetryRule:会先按照轮询获取服务,如果服务获取失败,则会在指定的时间内进行,重试
*/
@LoadBalanced //ribbon,基于客户端实现负载均衡
@Bean
public RestTemplate restTemplate(){
return new RestTemplate();
}
//负载均衡随机案例
@Bean
public IRule myRule(){
return new RandomRule();
}
}
或在消费者主启动类上配置Ribbon的随机算法操作(推荐)
3.2.2、新建LianRule 类
package com.lian.springcloud.rule;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.RandomRule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class LianRule {
@Bean
public IRule LianRule(){
return new RandomRule();
}
}
3.2.3、主启动类配置@RibbonClient注解
package com.lian.springcloud;
import com.lian.springcloud.rule.MyRule;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
@EnableEurekaClient
@SpringBootApplication
/**
* name是要负载均衡的服务名,服务名下有多个生产者提供的服务,采用MyRule负载均衡算法,此处的负载均衡算法是随机
* 在微服务启动的时候就能加载我们自定义的Ribbon类,实现负载均衡算法
*/
@RibbonClient(name = "springcloud-provider-dept",configuration = LianRule.class)
public class DeptConsumer_80 {
public static void main(String[] args) {
SpringApplication.run(DeptConsumer_80.class,args);
}
}
3.3、演示自定义的负载均衡算法
消费者80目录结构图
3.3.1、新建LianRule类
IRule接口中查询发现有了我们自定义的负载均衡算法方法
package com.lian.springcloud.rule;
import com.netflix.loadbalancer.IRule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class LianRule {
@Bean
public IRule myRule(){
return new LianRandomRule();
}
}
3.3.2、新建LianRandomRule类
package com.lian.springcloud.rule;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.AbstractLoadBalancerRule;
import com.netflix.loadbalancer.ILoadBalancer;
import com.netflix.loadbalancer.Server;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
public class LianRandomRule extends AbstractLoadBalancerRule {
/**
* 需求:
* 在生产者提供的3个服务中8001、8002、8003,每个服务,访问5次
* total = 0,默认=0,如果=5,我们指向下一个服务节点
* index=0,默认0,如果total=5,index+1
*/
//被调用的次数
private int total = 0;
//当前是谁在提供服务
private int currentIndex = 0;
public Server choose(ILoadBalancer lb, Object key) {
if (lb == null) {
return null;
}
Server server = null;
while (server == null) {
if (Thread.interrupted()) {
return null;
}
//获取活着的服务
List<Server> upList = lb.getReachableServers();
//获取全部的服务
List<Server> allList = lb.getAllServers();
int serverCount = allList.size();
if (serverCount == 0) {
return null;
}
//生成全部服务个数的区间随机数
//int index = chooseRandomInt(serverCount);
//从活着的服务中随机获取一个
//server = upList.get(index);
//-----------------------自定义----------------------------
//如果当前的服务被调用次数小于5次
if (total < 5){
//就从活着的服务中继续调用当前的服务
server = upList.get(currentIndex);
total++;
}else{
//新服务被调用的次数是0
total=0;
//切换成下一个服务
currentIndex++;
//因为只有3个服务,下标为0、1、2,如果新服务的下标超过活着的服务数3,
if (currentIndex >= upList.size()){
//就再次切换到第0个服务
currentIndex=0;
}
//从活着的服务中获取指定的服务进行操作
server = upList.get(currentIndex);
}
//---------------------------------------------------
if (server == null) {
Thread.yield();
continue;
}
if (server.isAlive()) {
return (server);
}
server = null;
Thread.yield();
}
return server;
}
protected int chooseRandomInt(int serverCount) {
return ThreadLocalRandom.current().nextInt(serverCount);
}
@Override
public Server choose(Object key) {
return choose(getLoadBalancer(), key);
}
@Override
public void initWithNiwsConfig(IClientConfig clientConfig) {
}
}
3.3.3、ConfigureBean 类不改变
package com.lian.springcloud.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 ConfigureBean {
//配置负载均衡实现RestTemplate,ribbon的作用
/**
* IRule
* RoundRobinRule 轮询
* RandomRule 随机
* AvailabilityFilteringRule:会先过滤掉,跳闸,访问故障的服务,对剩下的进行轮询
* RetryRule:会先按照轮询获取服务,如果服务获取失败,则会在指定的时间内进行,重试
*/
@LoadBalanced //ribbon,基于客户端实现负载均衡
@Bean
public RestTemplate restTemplate(){
return new RestTemplate();
}
// @Bean
// public IRule myRule(){
// return new RandomRule();
// }
}
3.3.4、DeptConsumerController 类不改变
package com.lian.springcloud.controller;
import com.lian.springcloud.pojo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import java.util.List;
@RestController
public class DeptConsumerController {
/**
* 1、消费者,不应该有service层
* 2、RestTemplate 供我们直接调用即可,注册到Spring容器中,由配置类注入spring容器
* ( url,实体:用map封装,Class<T> responseType )
*/
@Autowired
RestTemplate restTemplate;
//未加Ribbon之前,客户端访问的是固定的某个端口,这样会导致机器压力较大,不能给多台机器合理分配任务量
//private static final String REST_URL_PREFIX = "http://localhost:8001";
/**
* 客户端访问的是某一个服务里面的多个随机的端口,根据IRule类,可根据权重等值来进行轮询,达到负载均衡的作用
*/
private static final String REST_URL_PREFIX = "http://SPRINGCLOUD-PROVIDER-DEPT";
@RequestMapping("/consumer/dept/get/{id}")
public Dept get(@PathVariable("id") Long id){
return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
}
@RequestMapping("/consumer/dept/list")
public List<Dept> list(){
return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list",List.class);
}
@RequestMapping("/consumer/dept/add")
public boolean add(Dept dept){
return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add",dept,Boolean.class);
}
}
3.3.5、主启动类 DeptConsumer_80
package com.lian.springcloud;
import com.lian.springcloud.rule.LianRule;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
/**
* name是要负载均衡的服务名,服务名下有多个生产者提供的服务,采用MyRule负载均衡算法,此处的负载均衡算法是随机
* 在微服务启动的时候就能加载我们自定义的Ribbon类,实现负载均衡算法
*/
@EnableEurekaClient
@SpringBootApplication
@RibbonClient(name = "SPRINGCLOUD-PROVIDER-DEPT",configuration = LianRule.class)
public class DeptConsumer_80 {
public static void main(String[] args) {
SpringApplication.run(DeptConsumer_80.class,args);
}
}
3.3.6、application.yaml 不改变
server:
port: 80
#Eureka配置
eureka:
client:
register-with-eureka: false #不向eureka注册自己
service-url:
defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
3.3.7、pom依赖不改变
<dependencies>
<!--实体类-->
<dependency>
<groupId>org.example</groupId>
<artifactId>springcloud-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<!--web启动器-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<!--Ribbon-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
<version>1.4.7.RELEASE</version>
</dependency>
<!--eureka-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
<version>1.4.6.RELEASE</version>
</dependency>
</dependencies>