Nacos基本概念，请参考：【SpringCloud】Spring Cloud Alibaba 及 Nacos介绍（二十六）
本章介绍，使用搭建以Nacos为注册中心的SpringCloud项目
搭建Nacos服务
1、下载nacos，地址https://github.com/alibaba/nacos/releases
本例使用的是nacos 1.2.1版本，下载得到nacos-server-1.2.1.tar.gz压缩包
2、解压文件nacos-server-1.2.1.tar.gz，进入目录，查看目录内容
3、使用命令启动nacos服务
命令：sh ./bin/startup.sh -m standalone
4、浏览器访问地址：http://localhost:8848/nacos
5、输入默认用户名/密码（nacos/nacos）
搭建服务提供者
1、新建一个工程（test-springcloud），导入Spring Cloud Alibaba依赖
1 <!-- spring cloud alibaba --> 2 <dependency> 3 <groupId>com.alibaba.cloud</groupId> 4 <artifactId>spring-cloud-alibaba-dependencies</artifactId> 5 <version>${spring-cloud-alibaba.version}</version> 6 <type>pom</type> 7 <scope>import</scope> 8 </dependency>
完整pom如下：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com.test</groupId> 8 <artifactId>test-springcloud</artifactId> 9 <version>1.0-SNAPSHOT</version> 10 <packaging>pom</packaging> 11 <!-- 统一管理jar包版本 --> 12 <properties> 13 <spring-boot.version>2.2.5.RELEASE</spring-boot.version> 14 <spring-cloud.version>Hoxton.SR3</spring-cloud.version> 15 <spring-cloud-alibaba.version>2.1.0.RELEASE</spring-cloud-alibaba.version> 16 <mybatis-spring-boot.version>2.1.2</mybatis-spring-boot.version> 17 <mysql.version>8.0.12</mysql.version> 18 <druid.version>1.1.21</druid.version> 19 <lombok.version>1.18.12</lombok.version> 20 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 21 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 22 <java.version>1.8</java.version> 23 </properties> 24 25 26 <!-- 依赖管理：子模块继承后，提供作用：锁定版本 + 子module 不用写 version --> 27 <dependencyManagement> 28 <dependencies> 29 <!-- spring boot --> 30 <dependency> 31 <groupId>org.springframework.boot</groupId> 32 <artifactId>spring-boot-dependencies</artifactId> 33 <version>${spring-boot.version}</version> 34 <type>pom</type> 35 <scope>import</scope> 36 </dependency> 37 <!-- spring cloud --> 38 <dependency> 39 <groupId>org.springframework.cloud</groupId> 40 <artifactId>spring-cloud-dependencies</artifactId> 41 <version>${spring-cloud.version}</version> 42 <type>pom</type> 43 <scope>import</scope> 44 </dependency> 45 <!-- spring cloud alibaba --> 46 <dependency> 47 <groupId>com.alibaba.cloud</groupId> 48 <artifactId>spring-cloud-alibaba-dependencies</artifactId> 49 <version>${spring-cloud-alibaba.version}</version> 50 <type>pom</type> 51 <scope>import</scope> 52 </dependency> 53 54 <!-- mybatis --> 55 <dependency> 56 <groupId>org.mybatis.spring.boot</groupId> 57 <artifactId>mybatis-spring-boot-starter</artifactId> 58 <version>${mybatis-spring-boot.version}</version> 59 </dependency> 60 61 <!-- mysql --> 62 <dependency> 63 <groupId>mysql</groupId> 64 <artifactId>mysql-connector-java</artifactId> 65 <version>${mysql.version}</version> 66 </dependency> 67 68 <!-- druid --> 69 <dependency> 70 <groupId>com.alibaba</groupId> 71 <artifactId>druid-spring-boot-starter</artifactId> 72 <version>${druid.version}</version> 73 </dependency> 74 75 <!-- lombok --> 76 <dependency> 77 <groupId>org.projectlombok</groupId> 78 <artifactId>lombok</artifactId> 79 <version>${lombok.version}</version> 80 </dependency> 81 82 <!-- test --> 83 <dependency> 84 <groupId>org.springframework.boot</groupId> 85 <artifactId>spring-boot-starter-test</artifactId> 86 <version>${spring-boot.version}</version> 87 <scope>test</scope> 88 <exclusions> 89 <exclusion> 90 <groupId>org.junit.vintage</groupId> 91 <artifactId>junit-vintage-engine</artifactId> 92 </exclusion> 93 </exclusions> 94 </dependency> 95 </dependencies> 96 </dependencyManagement> 97 98 <!-- SpringBoot打包插件，可以将代码打包成一个可执行的jar包 --> 99 <build> 100 <finalName>${project.artifactId}</finalName> 101 <plugins> 102 <plugin> 103 <groupId>org.springframework.boot</groupId> 104 <artifactId>spring-boot-maven-plugin</artifactId> 105 <version>${spring-boot.version}</version> 106 <configuration> 107 <fork>true</fork> 108 <addResources>true</addResources> 109 </configuration> 110 </plugin> 111 </plugins> 112 </build> 113 </project>
2、新建一个模块服务提供者（springcloud-provider-alibaba-payment9001），引入Nacos依赖
1 <!-- alibaba nacos --> 2 <dependency> 3 <groupId>com.alibaba.cloud</groupId> 4 <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> 5 </dependency>
完整pom如下：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <parent> 6 <artifactId>test-springcloud</artifactId> 7 <groupId>com.test</groupId> 8 <version>1.0-SNAPSHOT</version> 9 </parent> 10 <modelVersion>4.0.0</modelVersion> 11 12 <artifactId>springcloud-provider-alibaba-payment9001</artifactId> 13 14 <dependencies> 15 16 <!-- alibaba nacos --> 17 <dependency> 18 <groupId>com.alibaba.cloud</groupId> 19 <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> 20 </dependency> 21 22 <!-- spring boot --> 23 <dependency> 24 <groupId>org.springframework.boot</groupId> 25 <artifactId>spring-boot-starter-web</artifactId> 26 </dependency> 27 <dependency> 28 <groupId>org.springframework.boot</groupId> 29 <artifactId>spring-boot-starter-actuator</artifactId> 30 </dependency> 31 <dependency> 32 <groupId>org.springframework.boot</groupId> 33 <artifactId>spring-boot-devtools</artifactId> 34 <scope>runtime</scope> 35 <optional>true</optional> 36 </dependency> 37 <dependency> 38 <groupId>org.projectlombok</groupId> 39 <artifactId>lombok</artifactId> 40 <optional>true</optional> 41 </dependency> 42 <dependency> 43 <groupId>org.springframework.boot</groupId> 44 <artifactId>spring-boot-starter-test</artifactId> 45 <scope>test</scope> 46 </dependency> 47 48 </dependencies> 49 50 </project>
3、新建一个配置文件appliction.yml
1 # 端口 2 server: 3 port: 9001 4 5 spring: 6 application: 7 name: nacos-payment-provider 8 cloud: 9 nacos: 10 discovery: 11 server-addr: localhost:8848
4、新建启动类
1 @EnableDiscoveryClient 2 @SpringBootApplication 3 public class PaymentMain9001 { 4 public static void main(String[] args) { 5 SpringApplication.run(PaymentMain9001.class, args); 6 } 7 }
5、新建一个Controller，如下：
1 @RestController 2 public class PaymentController { 3 4 @Value("${server.port}") 5 private String serverPort; 6 7 @GetMapping(value = "/payment/nacos/{id}") 8 public String getPayment(@PathVariable("id") Integer id) { 9 return "nacos registry, serverPort: " + serverPort + "\t id: " + id; 10 } 11 }
6、测试
1）启动Nacos服务，启动服务提供者模块
2）访问地址：http://localhost:9001/payment/nacos/11，正常获取内容
3）访问Nacos的Web界面，查看服务列表菜单
可以看到服务列表中，有nacos-payment-provider服务
搭建服务消费者
1、在父工程（test-springcloud）中，新建服务消费者模块（springcloud-consumer-alibaba-order7001）
2、引入nacos依赖，同上
完整pom如下：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <parent> 6 <artifactId>test-springcloud</artifactId> 7 <groupId>com.test</groupId> 8 <version>1.0-SNAPSHOT</version> 9 </parent> 10 <modelVersion>4.0.0</modelVersion> 11 12 <artifactId>springcloud-consumer-alibaba-order7001</artifactId> 13 14 <dependencies> 15 16 <!-- alibaba nacos --> 17 <dependency> 18 <groupId>com.alibaba.cloud</groupId> 19 <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> 20 </dependency> 21 22 <!-- spring boot --> 23 <dependency> 24 <groupId>org.springframework.boot</groupId> 25 <artifactId>spring-boot-starter-web</artifactId> 26 </dependency> 27 <dependency> 28 <groupId>org.springframework.boot</groupId> 29 <artifactId>spring-boot-starter-actuator</artifactId> 30 </dependency> 31 <dependency> 32 <groupId>org.springframework.boot</groupId> 33 <artifactId>spring-boot-devtools</artifactId> 34 <scope>runtime</scope> 35 <optional>true</optional> 36 </dependency> 37 <dependency> 38 <groupId>org.projectlombok</groupId> 39 <artifactId>lombok</artifactId> 40 <optional>true</optional> 41 </dependency> 42 <dependency> 43 <groupId>org.springframework.boot</groupId> 44 <artifactId>spring-boot-starter-test</artifactId> 45 <scope>test</scope> 46 </dependency> 47 48 </dependencies> 49 </project>
3、编写配置文件，如下：
1 # 端口 2 server: 3 port: 7001 4 5 spring: 6 application: 7 name: nacos-order-consumer 8 cloud: 9 nacos: 10 discovery: 11 server-addr: localhost:8848
4、编写启动类，如下：
1 @EnableDiscoveryClient 2 @SpringBootApplication 3 public class OrderMain7001 { 4 public static void main(String[] args) { 5 SpringApplication.run(OrderMain7001.class, args); 6 } 7 }
5、编辑配置类，代码如下，注入RestTemplate
1 @Configuration 2 public class AppConfig { 3 4 @Bean 5 @LoadBalanced 6 public RestTemplate restTemplate(){ 7 return new RestTemplate(); 8 } 9 10 }
6、编写一个Controller用于访问
@RestController public class OrderController { @Autowired private RestTemplate restTemplate; @GetMapping(value = "/consumer/payment/nacos/{id}") public String paymentInfo(@PathVariable("id") Integer id) { return restTemplate.getForObject("http://nacos-payment-provider" + "/payment/nacos/" + id, String.class); } }
7、测试
1）启动Nacos服务，启动服务提供者模块，启动服务消费者模块
2）访问地址：http://localhost:9001/payment/nacos/11，正常获取内容
访问地址：http://localhost:7001/consumer/payment/nacos/11，正常获取内容
3）访问Nacos的Web界面，查看服务列表菜单，分别可以看到一个nacos-payment-provider服务，一个nacos-order-consumer服务
4）在搭建一个（springcloud-provider-alibaba-payment9002）服务提供者模块，与9001模块内容相同，只有端口的区别
5）启动9002模块，使用地址：http://localhost:7001/consumer/payment/nacos/11，访问获取内容
获取的内容，是轮流从9001与9002这两个节点上获取
6）访问Nacos的Web界面，查看服务列表菜单
