Spring Cloud Alibaba 注册一个服务-HelloWorld（三）
“ 本章节我们写一个spring cloud alibaba 注册服务的一个HelloWorld, 大家可以了解一下基本的provider写法。”
01
—
环境检查
上一章介绍了怎么搭建Spring cloud alibaba运行环境。客官需要确认一下环境是否已经启动。
Nacos: http://localhost:8848/nacos/
Sentinel: http://localhost:8858/
如果没有启动的话，用命令启动一下：
➜ docker docker-compose up -d nacos mysql is up-to-date Creating nacos ... done ➜ docker docker-compose up -d sentinel Creating sentinel … done
如果新客官还没有安装环境的话，去看一下公众号上一章内容 “Docker composer搭建Spring Cloud Alibaba 运行环境（二）”
02
—
SpringBoot Provider搭建
废话不多少说，先上项目结构，是一个基本的springboot 项目结构：
暂时只需要看一下springcloud-provider项目结构，common和consumer会在之后的章节中讲到。熟悉JAVA项目的同学应该会比较熟悉，就不再赘述了。
先是pom.xml文件：
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.laobaozi</groupId> <artifactId>springcloud-provider</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springcloud-provider</name> <description>Demo project for alibaba springcloud</description> <properties> <java.version>1.8</java.version> <spring-boot.version>2.3.4.RELEASE</spring-boot.version> <springcloud-alibaba.version>0.9.0.RELEASE</springcloud-alibaba.version> <mybatis-plus.version>3.1.1</mybatis-plus.version> <mysql.version>5.1.47</mysql.version> <encoding>UTF-8</encoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>${spring-boot.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!--database--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>${mybatis-plus.version}</version> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>${springcloud-alibaba.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <!--Spring Boot--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j2</artifactId> </dependency> <!--Spring Cloud Alibaba--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> <version>2.2.5.RELEASE</version> </dependency> <!--Spring Cloud Alibaba end--> <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>
依赖非常清晰，除springboot和数据库外，多了两个和spring cloud alibaba相关的依赖，已经做了标识。
其次：Application.yml
server: port: 8011 spring: application: name: springcloud-provicer-demo cloud: nacos: discovery: server-addr: 127.0.0.1:8848/
这里需要注意一下，有的时候因为docker配置的问题没办法用127.0.0.1访问，这个时候可以改成局域网IP。
启动类：SpringcloudProviderApplication.java
package com.laobaozi.springcloud.provider; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; @SpringBootApplication @EnableDiscoveryClient public class SpringcloudProviderApplication { public static void main(String[] args) { SpringApplication.run(SpringcloudProviderApplication.class, args); } }
Controller:
package com.laobaozi.springcloud.provider.controller;
import com.laobaozi.springcloud.provider.model.UserDto;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;
@RestController
public class UserController {
@RequestMapping("/user/list")
public List<UserDto> listUsers() {
List users = new ArrayList();
UserDto userDto = new UserDto();
userDto.setAge(20);
userDto.setName("张三");
users.add(userDto);
return users;
}
@RequestMapping("/user/getUserName")
public String listUsersName() {
return "this is jim";
}
}
Fegin Service:
package com.laobaozi.springcloud.provider.service;
import com.laobaozi.springcloud.provider.model.UserDto;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
@FeignClient(name = "user-service")
public interface UserFeginService {
@PostMapping("/fegin/user/list")
UserDto listUser();
}
Dto:
public class UserDto {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
启动项目：
显示8011端口项目启动成功。
试着访问一下定义的两个接口：
list user:
Get user:
03
—
检查Nacos注册器
在Nacos系统中的服务列表就可以看到我们的provider demo了。
至此服务都注册进了注册中心Nacos并且都能对外提供基本的用户列表查询和单用户查询能力，本期的springcloud alibaba服务注册就到这里。
下期我们来讲怎么调用Nacos注册的服务，即消费端。
