nacos作为配置中心

项目介绍

这是我的项目模块，后面会继续补充。其中其中涉及到的有，nacos注册中心、配置中心、sentinel熔断限流降级，open-feign负载均衡，gateway网关，大概目前就这几个模块，嗯，只能带领你入门。

项目搭建

父模块的pom是这样的

<?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.gbicc</groupId>
    <artifactId>SpringCloud</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>poem-system</module>
        <module>poem-gateway</module>
        <module>poem-config</module>
        <module>poem-sentinel</module>
        <module>poem-CRM</module>
    </modules>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-boot.version>2.2.6.RELEASE</spring-boot.version>
        <spring-cloud.version>Hoxton.SR4</spring-cloud.version>
        <spring-boot-admin.version>2.2.3</spring-boot-admin.version>
        <spring-boot.mybatis>2.1.2</spring-boot.mybatis>
        <nacos.version>1.3.0</nacos.version>
        <swagger.fox.version>2.9.2</swagger.fox.version>
        <swagger.core.version>1.5.24</swagger.core.version>
        <kaptcha.version>2.3.2</kaptcha.version>
        <pagehelper.boot.version>1.2.12</pagehelper.boot.version>
        <commons.io.version>2.5</commons.io.version>
        <commons.fileupload.version>1.3.3</commons.fileupload.version>
        <velocity.version>1.7</velocity.version>
        <fastjson.version>1.2.70</fastjson.version>
        <poi.version>3.17</poi.version>
        <common-pool.version>2.6.2</common-pool.version>
    </properties>

    <!-- 依赖声明 -->
    <dependencyManagement>
        <dependencies>

            <!-- SpringCloud 微服务 -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- SpringCloud Alibaba 微服务 -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.2.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- Alibaba Nacos 配置 -->
            <dependency>
                <groupId>com.alibaba.nacos</groupId>
                <artifactId>nacos-client</artifactId>
                <version>${nacos.version}</version>
            </dependency>

            <!-- SpringBoot 依赖配置 -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!--  SpringBoot 监控客户端 -->
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-starter-client</artifactId>
                <version>${spring-boot-admin.version}</version>
            </dependency>

            <!-- Mybatis 依赖配置 -->
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${spring-boot.mybatis}</version>
            </dependency>

            <!-- io常用工具类 -->
            <dependency>
                <groupId>commons-io</groupId>
                <artifactId>commons-io</artifactId>
                <version>${commons.io.version}</version>
            </dependency>

            <!-- JSON 解析器和生成器 -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${fastjson.version}</version>
            </dependency>

            <!-- 公共资源池 -->
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-pool2</artifactId>
                <version>${common-pool.version}</version>
            </dependency>

        </dependencies>
    </dependencyManagement>


    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

1创建pom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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>SpringCloud</artifactId>
        <groupId>com.gbicc</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>poem-system</artifactId>


    <dependencies>

        <!-- SpringCloud Ailibaba Nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <!-- SpringCloud Ailibaba Nacos Config -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <!-- SpringCloud Ailibaba Sentinel -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

        <!-- SpringBoot Web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- Mysql Connector -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

2.创建application.yml

server:
  port: 8088
spring:
  application:
    name: poem-system
  profiles:
    active: dev
    cloud:
      nacos:
        discovery:
          #向注册中心注册
          server-addr: localhost:8848
          #向配置中心注册，注册中心时，这里可以不用
        config:
          server-addr: 127.0.0.1:8848

3.创建一个控制器HelloController，为了测试

package com.gbicc.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/system/hello")
    public String hello(){
        //throw new RuntimeException("熔断降级吧");
        return "hello springcould";
    }
}

4.创建一个启动spring boot的启动类

package com.gbicc;

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

@SpringBootApplication
@EnableDiscoveryClient
public class SystemApplication {
    public static void main(String[] args) {
        SpringApplication.run(SystemApplication.class,args);
        System.out.println("系统模块启动成功");
    }
}

nacos中心记得一定要配置poem-system-dev.yml(这里-dev是测试环境，后面会详细讲解)

poem-system-dev.yml的详情

项目启动后，可以在服务器列表看到该项目启动了。

OK，这个时候直接访问http://localhost:8088/system/hello

证明将服务注册到注册中心了。