1. 配置中心實(shí)戰(zhàn)

配置中心在項(xiàng)目中的作用是什么？趕快來(lái)體驗(yàn)一把吧！Let’s go!

1.1 實(shí)現(xiàn)步驟

?步驟一：編寫user測(cè)試服務(wù)：添加數(shù)據(jù) --> clouddb5.tuser
?步驟二:將程序打包jar包，運(yùn)行jar包
?步驟三：編寫nacos配置中心， clouddb6.tuser
話不多說(shuō)！開始體驗(yàn)吧！！

1.2 體驗(yàn)

（1）創(chuàng)建user測(cè)試服務(wù)
?修改父項(xiàng)目，添加依賴（鎖定）

<?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.czxy.changgou4</groupId><artifactId>changgou4-parent-ali</artifactId><packaging>pom</packaging><version>1.0-SNAPSHOT</version><modules><module>test-nacos-cloud-provider</module><module>test-nacos-cloud-consumer</module><module>test-nacos-cloud-config</module><module>test-nacos-cloud-config-mysql-java34</module></modules><!-- 1 確定spring boot的版本--><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.5.RELEASE</version></parent><!--2 確定版本--><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version><spring-cloud-release.version>Hoxton.SR3</spring-cloud-release.version><nacos.version>1.1.0</nacos.version><alibaba.cloud.version>2.2.1.RELEASE</alibaba.cloud.version><mysql.version>5.1.32</mysql.version><mybatis.plus.version>3.4.0</mybatis.plus.version><jwt.jjwt.version>0.9.0</jwt.jjwt.version><jwt.joda.version>2.9.7</jwt.joda.version><swagger.version>2.7.0</swagger.version></properties><!-- 3 鎖定版本--><dependencyManagement><dependencies><!-- sprig cloud--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud-release.version}</version><type>pom</type><scope>import</scope></dependency><!--nacos --><dependency><groupId>com.alibaba.nacos</groupId><artifactId>nacos-client</artifactId><version>${nacos.version}</version></dependency><!--nacos cloud 發(fā)現(xiàn) --><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId><version>${alibaba.cloud.version}</version></dependency><!--nacos cloud 配置 --><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId><version>${alibaba.cloud.version}</version></dependency><!-- https://mvnrepository.com/artifact/com.alibaba.cloud/spring-cloud-starter-alibaba-sentinel --><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId><version>${alibaba.cloud.version}</version></dependency><!-- mybatis plus--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>${mybatis.plus.version}</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-annotation</artifactId><version>${mybatis.plus.version}</version></dependency><!-- mysql驅(qū)動(dòng) --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql.version}</version></dependency><!--swagger2--><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>${swagger.version}</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>${swagger.version}</version></dependency></dependencies></dependencyManagement></project>

?創(chuàng)建user服務(wù)：test-nacos-cloud-config-mysql-java34
?修改pom添加依賴

<dependencies><!-- web 啟動(dòng)器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- nacos 配置--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId></dependency><!--swagger2--><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId></dependency><!-- mybatis plus--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId></dependency><!-- mysql驅(qū)動(dòng) --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--lombok , @Data 等--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies>

?編寫yml文件：bootstrap.yml

# 服務(wù)端口號(hào) server:port: 7777 # 服務(wù)名 spring:application:name: user-servicedatasource:driverClassName: com.mysql.jdbc.Driverurl: jdbc:mysql://127.0.0.1:3306/cloud_db5?useUnicode=true&characterEncoding=utf8 // 注意庫(kù)名別寫錯(cuò)了username: rootpassword: 1234cloud:nacos:config:server-addr: 127.0.0.1:8848 # nacos 服務(wù)地址prefix: user # 3.1 前綴，默認(rèn) ${spring.application.name}file-extension: yaml # 3.2 后綴 , user.yamlgroup: DEFAULT_GROUP # 3.3 組名#開啟log4j打印SQL語(yǔ)句 logging:level:com:czxy:changgou4:mapper: debug# mp日志打印 mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

?編寫啟動(dòng)類

package com.czxy.changgou4.user;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;/*** @author 桐叔* @email liangtong@itcast.cn*/ @SpringBootApplication public class UserServiceApplication {public static void main(String[] args) {SpringApplication.run(UserServiceApplication.class,args);} }

?初始化數(shù)據(jù)庫(kù)

create database cloud_db5; use cloud_db5; CREATE TABLE t_user(id INT PRIMARY KEY AUTO_INCREMENT,username VARCHAR(50) );create database cloud_db6; use cloud_db6; CREATE TABLE t_user(id INT PRIMARY KEY AUTO_INCREMENT,username VARCHAR(50) );

?完成user添加
–拷貝配置類：swagger

–編寫domain：Userpackage com.czxy.changgou4.user.domain;import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableId; import com.baomidou.mybatisplus.annotation.TableName; import lombok.Data;/*** @author 桐叔* @email liangtong@itcast.cn*/ @TableName("t_user") @Data public class User {@TableId(type = IdType.AUTO)private Integer id;private String username; }

–編寫mapper

–編寫service
?接口

?實(shí)現(xiàn)類

?編寫controller

（2）打包項(xiàng)目，并運(yùn)行

?修改pom文件，添加maven插件，確定啟動(dòng)類

<build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><!--啟動(dòng)類--><mainClass>com.czxy.changgou4.user.UserServiceApplication</mainClass></configuration></plugin></plugins></build>

?點(diǎn)擊package進(jìn)行打包

?通過(guò)cmd運(yùn)行程序 找到j(luò)ar所在位置上一層輸入cmd

在cmd中輸入 java -jar xxxx.jar（xxxx–>jar包名）

啟動(dòng)成功后打開swagger體驗(yàn)一把

查看一波數(shù)據(jù)庫(kù)

（3） nacos配置，重新運(yùn)行
?目的：切換數(shù)據(jù)庫(kù)再體驗(yàn)一波

?重新運(yùn)行jar，再測(cè)試

打開swagger添加

查看數(shù)據(jù)庫(kù)

后記

歡迎體驗(yàn)，如果有更好玩的jar請(qǐng)?jiān)谠u(píng)論區(qū)分享，謝謝！！今天也要開心！！

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