0.9.0.RELEASE版本的spring cloud alibaba nacos实例
简而言之，nacos与eureka的不同之处有三：后台老板、部署方式、功能。nacos是阿里的，eureka是奈飞的；nacos有自己的安装包，需要独立部署，eureka仅作为一个服务组件，引入jar包即可；nacos=eureka+config，它既是注册中心，也是配置中心。
如何使用nacos？先下载安装包（下载地址https://github.com/alibaba/nacos/releases），打开下载页 -> 点击目前最新版本1.1.3跳到下载页 -> 点击压缩包 -> 下载到本地（E盘download目录）后解压 -> 通过命令行启动nacos：
C:\Users\wulf>e: E:\>cd download\nacos\bin E:\download\nacos\bin>startup.cmd -m standalone ,--. ,--.'| ,--,: : | Nacos 1.1.3 ,`--.'`| ' : ,---. Running in stand alone mode, All function modules | : : | | ' ,'\ .--.--. Port: 8848 : | \ | : ,--.--. ,---. / / | / / ' Pid: 32916 | : ' '; | / \ / \. ; ,. :| : /`./ Console: http://10.10.100.110:8848/nacos/index.html ' ' ;. ;.--. .-. | / / '' | |: :| : ;_ | | | \ | \__\/: . .. ' / ' | .; : \ \ `. https://nacos.io ' : | ; .' ," .--.; |' ; :__| : | `----. \ | | '`--' / / ,. |' | '.'|\ \ / / /`--' / ' : | ; : .' \ : : `----' '--'. / ; |.' | , .-./\ \ / `--'---' '---' `--`---' `----' 2019-08-21 10:44:30,073 INFO Bean 'org.springframework.security.config.annotation.configuration.ObjectPostProcessorConfiguration' of type [org.springframework.security.config.annotation.configuration.ObjectPostProcessorConfiguration$$EnhancerBySpringCGLIB$$209b3f7a] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2019-08-21 10:44:30,213 INFO Bean 'objectPostProcessor' of type [org.springframework.security.config.annotation.configuration.AutowireBeanFactoryObjectPostProcessor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2019-08-21 10:44:30,225 INFO Bean 'org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler@6e9175d8' of type [org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2019-08-21 10:44:30,234 INFO Bean 'org.springframework.security.config.annotation.method.configuration.GlobalMethodSecurityConfiguration' of type [org.springframework.security.config.annotation.method.configuration.GlobalMethodSecurityConfiguration$$EnhancerBySpringCGLIB$$456fe22c] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2019-08-21 10:44:30,241 INFO Bean 'methodSecurityMetadataSource' of type [org.springframework.security.access.method.DelegatingMethodSecurityMetadataSource] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2019-08-21 10:44:32,145 INFO Tomcat initialized with port(s): 8848 (http) 2019-08-21 10:44:35,148 INFO Root WebApplicationContext: initialization completed in 8513 ms 2019-08-21 10:44:40,366 INFO Initializing ExecutorService 'applicationTaskExecutor' 2019-08-21 10:44:40,922 INFO Adding welcome page: class path resource [static/index.html] 2019-08-21 10:44:41,424 INFO Creating filter chain: Ant [pattern='/'], [] 2019-08-21 10:44:41,435 INFO Creating filter chain: Ant [pattern='/**/*.css'], [] 2019-08-21 10:44:41,435 INFO Creating filter chain: Ant [pattern='/**/*.js'], [] 2019-08-21 10:44:41,438 INFO Creating filter chain: Ant [pattern='/**/*.html'], [] 2019-08-21 10:44:41,442 INFO Creating filter chain: Ant [pattern='/**/*.map'], [] 2019-08-21 10:44:41,442 INFO Creating filter chain: Ant [pattern='/**/*.svg'], [] 2019-08-21 10:44:41,444 INFO Creating filter chain: Ant [pattern='/**/*.png'], [] 2019-08-21 10:44:41,444 INFO Creating filter chain: Ant [pattern='/**/*.ico'], [] 2019-08-21 10:44:41,444 INFO Creating filter chain: Ant [pattern='/console-fe/public/**'], [] 2019-08-21 10:44:41,446 INFO Creating filter chain: Ant [pattern='/v1/auth/login'], [] 2019-08-21 10:44:41,447 INFO Creating filter chain: Ant [pattern='/v1/console/health/**'], [] 2019-08-21 10:44:41,447 INFO Creating filter chain: Ant [pattern='/v1/cs/**'], [] 2019-08-21 10:44:41,447 INFO Creating filter chain: Ant [pattern='/v1/ns/**'], [] 2019-08-21 10:44:41,447 INFO Creating filter chain: Ant [pattern='/v1/cmdb/**'], [] 2019-08-21 10:44:41,450 INFO Creating filter chain: Ant [pattern='/actuator/**'], [] 2019-08-21 10:44:41,454 INFO Creating filter chain: Ant [pattern='/v1/console/server/**'], [] 2019-08-21 10:44:41,498 INFO Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@6c8bca63, org.springframework.security.web.context.SecurityContextPersistenceFilter@6d24ffa1, org.springframework.security.web.header.HeaderWriterFilter@74cadd41, org.springframework.security.web.authentication.logout.LogoutFilter@42a9e5d1, com.alibaba.nacos.console.filter.JwtAuthenticationTokenFilter@2364305a, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@773f7880, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@4c51bb7, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@470a696f, org.springframework.security.web.session.SessionManagementFilter@55e8ec2f, org.springframework.security.web.access.ExceptionTranslationFilter@62fad19, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@5536379e] 2019-08-21 10:44:41,566 INFO Exposing 2 endpoint(s) beneath base path '/actuator' 2019-08-21 10:44:41,616 INFO Initializing ExecutorService 'taskScheduler' 2019-08-21 10:44:41,773 INFO Tomcat started on port(s): 8848 (http) with context path '/nacos' 2019-08-21 10:44:41,778 INFO Nacos Log files: E:\download\nacos/logs/ 2019-08-21 10:44:41,783 INFO Nacos Conf files: E:\download\nacos/conf/ 2019-08-21 10:44:41,783 INFO Nacos Data files: E:\download\nacos/data/ 2019-08-21 10:44:41,784 INFO Nacos started successfully in stand alone mode. 2019-08-21 10:44:44,665 INFO Initializing Servlet 'dispatcherServlet' 2019-08-21 10:44:44,686 INFO Completed initialization in 20 ms
我们通过localhost:8848/nacos可以访问到它，默认用户名密码都是nacos：
我们创建个项目来注册到这个nacos，三板斧再来：
1、pom引入spring boot、spring cloud、spring cloud alibaba和nacos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"> <modelVersion>4.0.0</modelVersion> <groupId>com.wlf</groupId> <artifactId>spring-cloud-alibaba-provider</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.7.RELEASE</version> </parent> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Greenwich.SR2</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>0.9.0.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2、application配置nacos地址：
#端口 server.port=8282 #应用名 spring.application.name=lxytrans-provider #注册中心 spring.cloud.nacos.discovery.server-addr=localhost:8848
3、启动类加注解@EnableDiscoveryClient：
import lombok.extern.slf4j.Slf4j; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.context.annotation.Bean; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @EnableDiscoveryClient @SpringBootApplication public class TransProviderApplication { public static void main(String[] args) { SpringApplication.run(TransProviderApplication.class, args); } @Slf4j @RestController static class TestController { @GetMapping("/hello") public String hello() { return "hello"; } @GetMapping("/hey") public String hey() throws InterruptedException { Thread.sleep(2000); return "hey"; } } }
跑起来后我们看下nacos控制台实例：
以上是服务提供方注册到nacos， 消费方的注册跟服务方没啥不同，这里就不再列出。nacos更多介绍参见https://nacos.io/zh-cn/docs/what-is-nacos.html。至于消费方如何通过nacos调用提供方服务，参见0.9.0.RELEASE版本的spring cloud alibaba nacos+feign实例。
