下面写一个简单的demo验证下eureka,实现服务注册、服务发现。
一、单节点:
1、api:
封装其他组件需要共用的dto
2、eureka-service服务注册中心:
(1)pom:
<?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"><modelVersion>4.0.0</modelVersion><groupId>com.demo.cloud</groupId><artifactId>myspringcloud-eureka-server</artifactId><version>1.0-SNAPSHOT</version><!-- springBoot --><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.9.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><spring-cloud.version>Edgware.RELEASE</spring-cloud.version></properties><dependencies><!--eureka-server--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka-server</artifactId></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><repositories><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/libs-milestone</url><snapshots><enabled>false</enabled></snapshots></repository></repositories></project>
(2)application.properties:在默认设置下,该服务注册中心也会将自己作为客户端来尝试注册它自己,所以需要禁用它的客户端注册行为
server.port=1111
eureka.client.registerWithEureka=false
eureka.client.fetchRegistry=false
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/
(3)启动类:
package com.demo.cloud;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@SpringBootApplication
@EnableEurekaServer
public class MyEurekaServerApplication {public static void main(String args[]){SpringApplication.run(MyEurekaServerApplication.class,args);}
}
启动后,访问http://localhost:1111/:
就可以从后台监控服务了,(是不是比dubbo搭建zk注册中心方便多了) ,此时还没有服务注册过来,可以看到application下是空的。
3、eureka-client注册服务提供者:将原有的springboot工程改造,注册到eureka注册中心
(1)pom:
<?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"><modelVersion>4.0.0</modelVersion><groupId>com.demo.cloud</groupId><artifactId>myspringcloud-eureka-client</artifactId><version>1.0-SNAPSHOT</version><!-- springBoot --><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.9.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><spring-cloud.version>Edgware.RELEASE</spring-cloud.version></properties><dependencies><!--eureka-server--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka-server</artifactId></dependency><dependency><groupId>com.demo.cloud.api</groupId><artifactId>myspringcloud-api</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- mybatis --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.1.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.21</version></dependency><dependency><groupId>commons-collections</groupId><artifactId>commons-collections</artifactId><version>3.2.1</version></dependency><dependency><groupId>commons-lang</groupId><artifactId>commons-lang</artifactId><version>2.5</version></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><repositories><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/libs-milestone</url><snapshots><enabled>false</enabled></snapshots></repository></repositories></project>
(2)application.properties:
server.port=2222
server.context-path=/myService
spring.application.name=my-service
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/#mybatis
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=wtyy
mybatis.mapper-locations=classpath*:Mapper/*Mapper.xml
(3)dao、service、Mapper:mybatis持久化部分,此处省略
(4)controller:
package com.demo.cloud.controller;import com.demo.cloud.dto.AuthorityDTO;
import com.demo.cloud.dto.UserDTO;
import com.demo.cloud.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RequestMapping("/user")
@RestController
public class UserApiController {@Autowiredprivate UserService userService;@Value("${server.port}")private String port;@RequestMapping("/findByUserName")public UserDTO findByUserName(String username){return userService.findByUserName(username);}@RequestMapping("/getAllUsers")public List<UserDTO> getAllUsers(){System.out.println(port);return userService.getAllUsers();}@RequestMapping("/getAuthortiesByUserId")public List<AuthorityDTO> getAuthortiesByUserId(Integer userId){return userService.getAuthortiesByUserId(userId);}@RequestMapping("/addUser")public void addUser1(@RequestBody UserDTO userDTO){userService.addUser(userDTO);}}
(5)启动类:
package com.demo.cloud;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication
@EnableEurekaClient
@MapperScan("com.demo.cloud.dao")
public class MyEurekaClientApplication {public static void main(String args[]){SpringApplication.run(MyEurekaClientApplication.class,args);}
}
启动项目,再浏览下http://localhost:1111/:
可以看到注册成功了。
二、高可用部署:
1、先部署eukera-service的高可用
2、再部署eureka-client的高可用:连接注册中心的配置项改为多个,以逗号分隔,然后将该组件部署多个节点即可
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/,http://xxx.xx.xxx:1111/eureka/