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:Userswulf>e:

E:>cd download
acosin

E:download
acosin>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
acos/logs/

2019-08-21 10:44:41,783 INFO Nacos Conf files: E:download
acos/conf/

2019-08-21 10:44:41,783 INFO Nacos Data files: E:download
acos/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。