Spring Cloud Alibaba 创建服务提供者

项目创建

  1. 创建一个名为idreamyou4cloud的Maven项目,pom.xml配置如下:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         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>cn.idreamyou</groupId>
    <artifactId>idreamyou4cloud</artifactId>
    <version>1.0.0</version>
    <modules>
        <module>idreamyou4cloud-upms</module>
    </modules>
    <packaging>pom</packaging>

    <properties>
        <spring-boot.version>2.3.1.RELEASE</spring-boot.version>
        <spring-cloud.version>Hoxton.SR5</spring-cloud.version>
        <spring-cloud-alibaba.version>2.2.1.RELEASE</spring-cloud-alibaba.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.version>3.8.1</maven.compiler.version>
        <spring.checkstyle.version>0.0.22</spring.checkstyle.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!--spring boot 公共版本定义-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud 公共版本定义-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud alibaba 公共版本定义-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--Lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>
        <!--测试依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.name}</finalName>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
        <pluginManagement>
            <plugins>
                <!--spring boot 默认插件-->
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <version>${spring-boot.version}</version>
                </plugin>
            </plugins>
        </pluginManagement>
        <plugins>
            <!--代码格式插件,默认使用spring 规则-->
            <plugin>
                <groupId>io.spring.javaformat</groupId>
                <artifactId>spring-javaformat-maven-plugin</artifactId>
                <version>${spring.checkstyle.version}</version>
            </plugin>
            <!--代码编译指定版本插件-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${maven.compiler.version}</version>
                <configuration>
                    <target>${maven.compiler.target}</target>
                    <source>${maven.compiler.source}</source>
                    <encoding>UTF-8</encoding>
                    <skip>true</skip>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <pluginRepositories>
        <pluginRepository>
            <id>aliyun-plugin</id>
            <url>https://maven.aliyun.com/repository/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

    <repositories>
        <!--阿里云代理-->
        <repository>
            <id>aliyun</id>
            <name>aliyun</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
        </repository>
    </repositories>

</project>
  1. 在刚才的Maven中创建一个名为idreamyou4cloud-upms的模块,pom.xml配置如下:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>idreamyou4cloud</artifactId>
        <groupId>cn.idreamyou</groupId>
        <version>1.0.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>idreamyou4cloud-upms</artifactId>
    <packaging>jar</packaging>

    <dependencies>
        <!--web 模块-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--注册中心客户端-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
  1. 编写SpringBoot启动类
package cn.idreamyou.idreamyou4cloud.upms;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * 通用用户权限管理系统
 *
 * @author juning
 * @date 2020/9/14
 */
@SpringBootApplication
@EnableDiscoveryClient
public class UpmsApplication {

    public static void main(String[] args) {
        SpringApplication.run(UpmsApplication.class, args);
    }

}

通过SpringCloud提供的原生注解@EnableDiscoveryClient开启服务发现

  1. 编写application.yml配置文件
server:
  # 服务端口
  port: 8081

spring:
  application:
    # 应用名称,这里采用Maven项目的模块名
    name: @artifactId@
  cloud:
    nacos:
      # 注册中心nacos的地址
      server-addr: localhost:8848

management:
  endpoints:
    web:
      exposure:
        include: "*"
  1. 编写控制器controller
package cn.idreamyou.idreamyou4cloud.upms.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

/**
 * nacos服务提供者
 *
 * @author juning
 * @date 2020/9/14
 */
@RestController
public class NacosProviderController {

    @Value("${server.port}")
    private String port;

    @GetMapping(value = "/test/{message}")
    public String test(@PathVariable String message) {
        return "Hello Nacos Discovery " + message + " i am from port " + port;
    }

}

整体项目结构如下:
image20200914150633001.png

启动项目

浏览器访问http://localhost:8848/nacos,可以发现upms已经出现在nacos的服务注册列表下:

image20200914151043198.png

浏览器访问http://localhost:8081/test/upms,你会看到Hello Nacos Discovery upms i am from port 8081

image20200914151311363.png

服务端点的检查

spring-cloud-starter-alibaba-nacos-discovery 在实现的时候提供了一个 EndPoint, EndPoint 的访问地址为 http://ip:port/actuator/nacos-discovery。 EndPoint 的信息主要提供了两类:

  1. subscribe: 显示了当前有哪些服务订阅者
  2. NacosDiscoveryProperties: 显示了当前服务实例关于 Nacos 的基础配置

通过浏览器访问 http://localhost:8081/actuator/nacos-discovery 你会在浏览器上看到:

image.png

注意:启动服务端点检查必须导入spring-boot-starter-actuator的依赖,并配置management.endpoints.web.exposure.include = *才会有效

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