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SpringCloud Alibaba从入门到精通教程（三）- 项目中快速集成配置中心·Nacos配置中心管理功能

2020-05-31 18:27 851 查看

需求背景

项目中快速集成配置中心·Nacos配置中心管理功能

Tips技术点

1. @Value注解

值绑定

2. 区分不同环境，对应不同配置中心管理功能

登录Nacos控制台，新增dev / test / prod三套不同环境，分别对应：开发环境 / 测试环境 / 生产环境
对控制台不熟，阅读教程：SpringCloud Alibaba从入门到精通教程（一）- 配置中心Nacos快速入门介绍·Server启动安装）

代码演示

1. 项目目录结构

2. pom.xml依赖组件

[code]<?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>

<artifactId>microservice-alibaba-nacos-config</artifactId>
<packaging>jar</packaging>

<parent>
<groupId>com.minbo.cloud.alibaba</groupId>
<artifactId>spring-cloud-alibaba-study-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
</dependency>
<dependency>
<groupId>com.github.xiaoymin</groupId>
<artifactId>swagger-bootstrap-ui</artifactId>
</dependency>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib-ext-spring</artifactId>
</dependency>
<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-alibaba-nacos-config</artifactId>
</dependency>
</dependencies>
</project>

3. bootstrap.yaml配置文件

这里的namespace值，使用的是：dev环境对应的命名空间id值

[code]spring:
application:
name: microservice-alibaba-nacos-config
profiles:
active: dev
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
namespace: 2bc5565f-453f-4b1c-bde4-eafe23bdb2f0
config:
server-addr: 127.0.0.1:8848
namespace: 2bc5565f-453f-4b1c-bde4-eafe23bdb2f0
file-extension: properties
shared-dataids: microservice-alibaba-nacos-config.properties
refreshable-dataids: microservice-alibaba-nacos-config.properties
# server
server:
port: 9091

点击+号，新增一个Data Id对应应用名的配置（Data Id名称是完整对应yaml配置文件的：microservice-alibaba-nacos-config.properties）

然后，点击“编辑”，新增“config.appKey=abc1234”内容，最后点击“发布”即可

4. 访问接口类

获取该值：

[code]package com.minbo.cloud.alibaba.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.minbo.cloud.alibaba.util.JsonResult;
import com.minbo.cloud.alibaba.util.ResultCode;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;

/**
* @author Minbo
*/
@RestController
@Slf4j
@Api(tags = { "init" })
@RefreshScope
public class InitController {

@Value("${config.appKey}")
private String appKey;

@ApiOperation(value = "获得AppKey值", httpMethod = "GET")
@GetMapping("/getAppKey")
public JsonResult getAppKey() {
return new JsonResult(ResultCode.SUCCESS, this.appKey);
}
}

注：@RefreshScope注解，支持实时修改配置值，而不需要重启项目

5. 启动类

[code]package com.minbo.cloud.alibaba;

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

import com.github.xiaoymin.swaggerbootstrapui.annotations.EnableSwaggerBootstrapUI;

/**
* 程序主入口
*
* @author Minbo
*
*/
@SpringBootApplication
@EnableSwaggerBootstrapUI
@EnableDiscoveryClient
public class Application {

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

}

5. 值是否获取成功

启动后，访问地址：http://localhost:9091/doc.html

区分不同环境用法

1. 支持DB和Redis配置中心下发

bootstrap.yaml.bak

[code]spring:
application:
name: microservice-alibaba-nacos-config
profiles:
active: dev
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
namespace: 2bc5565f-453f-4b1c-bde4-eafe23bdb2f0
config:
server-addr: 127.0.0.1:8848
namespace: 2bc5565f-453f-4b1c-bde4-eafe23bdb2f0
file-extension: properties
shared-dataids: microservice-alibaba-nacos-config.properties
refreshable-dataids: microservice-alibaba-nacos-config.properties
datasource:
driverClassName: ${config.datasource.driverClassName}
url: ${config.datasource.url}
username: ${config.datasource.username}
password: ${config.datasource.password}
hikari:
initial-size: ${config.datasource.initialSize}
minimum-idle: ${config.datasource.minIdle}
maximum-pool-size: ${config.datasource.maxActive}
auto-commit: true
idle-timeout: 20000
pool-name: MyHikarifMain
max-lifetime: 1800000
connection-timeout: 20000
connection-test-query: SELECT 1
validation-timeout: 5000
redis:
host: ${config.redis.host}
port: ${config.redis.port}
password: ${config.redis.password}
pool:
max-idle: ${config.redis.pool.max-idle}
min-idle: ${config.redis.pool.min-idle}
max-active: ${config.redis.pool.max-active}
max-wait: ${config.redis.pool.max-wait}
timeout: ${config.redis.timeout}
commandTimeout: ${config.redis.commandTimeout}

# server
server:
port: 9091

2. 支持多环境不同配置下发

bootstrap.yaml2.bak

[code]# 不同的环境使用不同的配置，通过指定启动参数使用不同的profile，比如：
# 开发环境：java -jar xxx.jar --spring.profiles.active=dev
# 生产环境：java -jar xxx.jar --spring.profiles.active=prod
spring:
application:
name: microservice-alibaba-nacos-config
profiles:
active: dev
datasource:
driverClassName: ${config.datasource.driverClassName}
url: ${config.datasource.url}
username: ${config.datasource.username}
password: ${config.datasource.password}
hikari:
initial-size: ${config.datasource.initialSize}
minimum-idle: ${config.datasource.minIdle}
maximum-pool-size: ${config.datasource.maxActive}
auto-commit: true
idle-timeout: 20000
pool-name: MyHikarifMain
max-lifetime: 1800000
connection-timeout: 20000
connection-test-query: SELECT 1
validation-timeout: 5000
redis:
host: ${config.redis.host}
port: ${config.redis.port}
password: ${config.redis.password}
pool:
max-idle: ${config.redis.pool.max-idle}
min-idle: ${config.redis.pool.min-idle}
max-active: ${config.redis.pool.max-active}
max-wait: ${config.redis.pool.max-wait}
timeout: ${config.redis.timeout}
commandTimeout: ${config.redis.commandTimeout}

# server
server:
port: 9091

#下面这一行务必不能少，区分不同配置，而且必须是三个字符"-"
---
spring:
profiles: dev
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
namespace: 2bc5565f-453f-4b1c-bde4-eafe23bdb2f0
config:
server-addr: 127.0.0.1:8848
namespace: 2bc5565f-453f-4b1c-bde4-eafe23bdb2f0
file-extension: properties
shared-dataids: microservice-alibaba-nacos-config.properties
refreshable-dataids: microservice-alibaba-nacos-config.properties
---
spring:
profiles: test
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
namespace: 47247e4c-b018-4c63-92cd-ebbc119eef7f
config:
server-addr: 127.0.0.1:8848
namespace: 47247e4c-b018-4c63-92cd-ebbc119eef7f
file-extension: properties
shared-dataids: microservice-alibaba-nacos-config.properties
refreshable-dataids: microservice-alibaba-nacos-config.properties
---
spring:
profiles: prod
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
namespace: 9d3bb62a-14c5-43aa-ac05-6576caa5be2b
config:
server-addr: 127.0.0.1:8848
namespace: 9d3bb62a-14c5-43aa-ac05-6576caa5be2b
file-extension: properties
shared-dataids: microservice-alibaba-nacos-config.properties
refreshable-dataids: microservice-alibaba-nacos-config.properties