記錄一下從零開始搭建一個(gè)springboot+springcloud+mybatis本地項(xiàng)目的demo的過程。純代碼小白一枚，若有不足或錯(cuò)誤之處，歡迎廣大朋友指出！

開發(fā)環(huán)境準(zhǔn)備：IDE：IntelliJ Idea 2019.3數(shù)據(jù)庫：mysql 8.0.2.2SpringBoot版本：2.2.0.RELEASESpringCloud版本：Hoxton.RELEASE

打開Idea，單擊New->File->Project，選擇Maven，直接下一步

輸入我們的項(xiàng)目名，我這里起名為pam，單擊Finish完成創(chuàng)建

->New->Module，創(chuàng)建一個(gè)注冊(cè)中心服務(wù)端的Module，輸入一下名稱，我這里以pam-server為例，直接選finish；同理再創(chuàng)建一個(gè)客戶端的Module，輸入一下名稱，我這里以pam-service為例，直接選finish，結(jié)構(gòu)如圖所示：

->Settings->Maven，配置一下本地的maven，單擊OK

引入一下springboot、springcloud及mybatis的依賴。這里引入的springboot版本為2.2.0-RELEASE，與之相對(duì)應(yīng)的springcloud版本為Hoxton.RELEASE。注意二者版本需要相適配，否則會(huì)啟動(dòng)報(bào)錯(cuò)。這里額外引入了幾個(gè)常用依賴，直接在maven單擊一下刷新，倉庫即可在線將所需依賴下載進(jìn)去。

<dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>2.2.0.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Hoxton.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <!--注冊(cè)中心相關(guān)依賴--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>5.0.4.RELEASE</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.10.0</version> </dependency> <!--mysql--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.16</version> </dependency> <!--mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.0.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId> <version>1.3.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-contract-stub-runner</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-contract-verifier</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-stream-test-support</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.5</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> </dependency> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.6</version> </dependency> </dependencies>五、創(chuàng)建如圖所示的目錄結(jié)構(gòu)：

①編寫注冊(cè)中心，注冊(cè)中心目錄結(jié)構(gòu)：

編寫WebApplication啟動(dòng)類，添加注解@EnableEurekaServer和@SpringBootApplication，我這里想做一個(gè)純注冊(cè)中心，不與數(shù)據(jù)庫掛鉤，所以增加了一個(gè)exclude = DataSourceAutoConfiguration.class，啟動(dòng)項(xiàng)目時(shí)不自動(dòng)與數(shù)據(jù)庫連接，若想讓注冊(cè)中心也連接數(shù)據(jù)庫，這個(gè)exclude也可以不要。如圖所示：

編寫application.yml

server: port: 8081eureka: instance: hostname: 127.0.0.1 server: enable-self-preservation: false # 關(guān)閉自我保護(hù)模式（默認(rèn)為打開） eviction-interval-timer-in-ms: 600000 # 續(xù)期時(shí)間，即掃描失效服務(wù)的間隔時(shí)間 一分鐘，本地測試不需這么頻繁，調(diào)為1小時(shí) client: register-with-eureka: false #自己就是注冊(cè)中心，不用注冊(cè)自己 fetch-registry: false #是否去注冊(cè)中心獲取其他服務(wù)的地址 serviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/spring: application: name: xinrong freemarker: prefer-file-system-access: false

編寫bootstrap.yml：

spring: cloud: config: enabled: false

編寫log4j.properties：

log4j.rootLogger=info, stdoutlog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%nlog4j.appender.logfile=org.apache.log4j.FileAppenderlog4j.appender.logfile.File=target/spring.loglog4j.appender.logfile.layout=org.apache.log4j.PatternLayoutlog4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

②編寫消費(fèi)者pam-service，消費(fèi)者目錄結(jié)構(gòu)：

編寫消費(fèi)者啟動(dòng)類PamApplication.java，添加注解@MapperScan(basePackages = {“com.xinrong.pam.*.mapper”})含義：mybatis中Mapper文件對(duì)應(yīng)的包，啟動(dòng)項(xiàng)目時(shí)會(huì)自動(dòng)掃描

編寫消費(fèi)者application.yml：

server: port: 8088 #端口號(hào)8088eureka: instance: hostname: 127.0.0.1 server: enable-self-preservation: false # 關(guān)閉自我保護(hù)模式（默認(rèn)為打開） eviction-interval-timer-in-ms: 600000 # 續(xù)期時(shí)間，即掃描失效服務(wù)的間隔時(shí)間 一分鐘 client: register-with-eureka: true #注冊(cè)到注冊(cè)中心 fetch-registry: true #是否去注冊(cè)中心獲取其他服務(wù)的地址：是 serviceUrl: defaultZone: http://127.0.0.1:8081/eureka/ #注冊(cè)中心地址mybatis: mapper-locations: mapper/* #mybatis映射文件路徑 config-location: classpath:/mybatis/mybatis-config.xml #mybatis配置文件路徑spring: application: name: pam #項(xiàng)目名 datasource: url: jdbc:mysql://127.0.0.1:3306/pam?characterEncoding=utf-8&serverTimezone=Asia/Shanghai username: root password: root driver-class-name: com.mysql.cj.jdbc.Driver freemarker: prefer-file-system-access: falsejdbc: driverClass: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/pam username: root password: root

在數(shù)據(jù)庫中創(chuàng)建一個(gè)pam_user表：

create table pam_user(objectId varchar(50) not null primary key ,userName varchar(50),password varchar(255),phoneNo varchar(20),sex varchar(5),birthDay date,Email varchar(50));

插入一條測試數(shù)據(jù)：

編寫user文件夾，創(chuàng)建五層架構(gòu)，在domain中創(chuàng)建一個(gè)實(shí)體類User：

創(chuàng)建controller類接口及實(shí)現(xiàn)類，添加@RestController注解，在接口上添加@RequestMapping注解：接口：

實(shí)現(xiàn)類：

同理，添加service接口及實(shí)現(xiàn)類，注意在實(shí)現(xiàn)類上添加@Service注解：

創(chuàng)建mapper文件，編寫Mapper接口，添加@Repository注解：

在resources中創(chuàng)建mybatis文件夾，編寫mybatis-config.xml配置文件：

<?xml version='1.0' encoding='UTF-8' ?><!DOCTYPE configuration PUBLIC '-//mybatis.org//DTD Config 3.0//EN' 'http://mybatis.org/dtd/mybatis-3-config.dtd'><configuration> <settings> <!-- 設(shè)置駝峰匹配 --> <setting name='mapUnderscoreToCamelCase' value='true'/> <!--增加日志輸出--> <setting name='logImpl' value='STDOUT_LOGGING' /> </settings></configuration>

編寫mapper文件，創(chuàng)建一個(gè)User類的mybatis映射文件：

<?xml version='1.0' encoding='UTF-8' ?><!DOCTYPE mapper PUBLIC '-//mybatis.org//DTD Mapper 3.0//EN' 'http://mybatis.org/dtd/mybatis-3-mapper.dtd'><mapper namespace='com.xinrong.pam.user.mapper.UserMapper'> <select resultType='com.xinrong.pam.user.domain.User'> select * from pam_user </select></mapper>

至此，Demo代碼編寫完畢，首先啟動(dòng)注冊(cè)中心pam_server，啟動(dòng)成功，通過地址http://127.0.0.1:8081/，成功查看到了注冊(cè)中心管理界面：

啟動(dòng)服務(wù)pam_service：

啟動(dòng)成功，再次查看注冊(cè)中心管理界面，可以看到pam服務(wù)成功注冊(cè)到了注冊(cè)中心：

通過瀏覽器地址欄鍵入“http://127.0.0.1:8088/controller/pam/user/getAll”，成功查詢到了庫中錄入的測試數(shù)據(jù)。至此，springBoot的項(xiàng)目基本架構(gòu)搭建成功！

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