这段时间正在写一个人力资源系统的毕设，想着用spring boot做一个分模块的，因为也用到了dubbo，所以分模块扩展性也比较好，正好做一个记录，记录出现的问题，这一篇可能有一些长，只是简单的分模块，主要是布局能互通，本人测试过了，能行，用的注解的方式
关于怎么创建spring boot怎么创建分模块的项目，这里不多加说明，网上很多

一、整体的项目结构

这里简单介绍一下模块的功能:

1. api：往dubbo上挂的服务，也可以认为是公共模块，
2. main：里面是server端，也就是dubbo的提供者需要的配置
3. support：主要是服务的实现
4. webapp：主要是Controller端和前端模板(我这用的freemarker)

父的pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.4.RELEASE</version></parent><groupId>com.hr</groupId><artifactId>hr-ms</artifactId><version>0.0.1-SNAPSHOT</version><!--父模块打包类型必须为pom--><packaging>pom</packaging><name>hr-ms</name><description>人力资源管理系统</description><!--子模块继承父模块--><modules><module>webapp</module><module>main</module><module>api</module><module>support</module></modules><!--这里进行版本控制--><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><dubbo.version>0.2.0</dubbo.version></properties><dependencyManagement>   <!--dependencyManagement用于管理依赖版本号--><dependencies><!--这个是dubbo zk，springboot整合完后的，要分清--><dependency><groupId>com.alibaba.boot</groupId><artifactId>dubbo-spring-boot-starter</artifactId><version>${dubbo.version}</version></dependency></dependencies></dependencyManagement>
</project>

二、api模块项目结构与需要注意的地方

1、需要注意的问题

因为是公共模块，所以不需要打包，下面这个在api模块的pom.xml中不需要下面这个，要不会就造成重复打包

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

2、api的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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.hr</groupId><artifactId>hr-ms</artifactId><version>0.0.1-SNAPSHOT</version></parent><groupId>com.hrms</groupId><artifactId>api</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>api</name><description>微服务的接口模块</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency></dependencies>
</project>

三、support模块上的结构和需要注意的地方

1、需要注意的地方

1. 和上面的api模块一样，不需要打包，pom文件中也就不需要spring-boot-maven-plugin
2. 因为这个是服务的实现包，所以需要能访问api模块的jar包，所以需要在support模块的pom文件上加上下面这个，

		<dependency><groupId>com.hrms</groupId><artifactId>api</artifactId><version>0.0.1-SNAPSHOT</version></dependency>

3. 注意服务实现的注解不能用错也就是@Service

import com.alibaba.dubbo.config.annotation.Service;
import com.hrms.api.domain.entity.User;
import com.hrms.api.service.UserService;
import com.hrms.support.manager.UserManager;
import javax.annotation.Resource;/*** @author 孔超* @date 2020/4/2 19:07*/@Service(interfaceClass = UserService.class) //这个注解必须是dubbo的，
public class UserServiceImpl implements UserService {@ResourceUserManager userManager;@Overridepublic User getById(Long id) {return userManager.getById(id);}
}

2、support模块的pom

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.hr</groupId><artifactId>hr-ms</artifactId><version>0.0.1-SNAPSHOT</version></parent><groupId>com.hrms</groupId><artifactId>support</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>support</name><description>服务的实现</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jdbc</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.2</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency><dependency><groupId>com.alibaba.boot</groupId><artifactId>dubbo-spring-boot-starter</artifactId></dependency><!--引用api模块--><dependency><groupId>com.hrms</groupId><artifactId>api</artifactId><version>0.0.1-SNAPSHOT</version></dependency></dependencies>
</project>

三、main模块结构和需要注意的地方

1、需要注意的地方

1. 这里的pom文件需要下面这个，整个server端只需要构建一个，而api，support，main三个只需要构建main这个

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

2. main的启动类需要注意的地方

/*** @author 孔超* @date 2020/4/2 19:07*/@SpringBootApplication(scanBasePackages = {"com.hrms.support.manager"})//因为有manger层，而且是在support模块里，就需要指定扫描的位置
@EnableDubbo(scanBasePackages = "com.hrms.support.service.impl") //扫描服务的实现类
@MapperScan(value = "com.hrms.support.dao") //扫描dao的接口，别忘了在dao接口上加上@Mapper
public class MainApplication {public static void main(String[] args) {SpringApplication.run(MainApplication.class, args);}}

3. 注意mapper文件的扫描位置，如果不是多模块就没问题，但是如果涉及到多模块，可能扫描不到resource文件夹下的mapper文件，

mybatis.mapper-locations=classpath:mapper/*.xml

如果上面不行的话可以用下面的

mybatis.mapper-locations=classpath*:mapper/*.xml

关于区别可以另行百度

2、main的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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.hr</groupId><artifactId>hr-ms</artifactId><version>0.0.1-SNAPSHOT</version></parent><groupId>com.hrms</groupId><artifactId>main</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>main</name><description>微服务挂起</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency><dependency><groupId>com.alibaba.boot</groupId><artifactId>dubbo-spring-boot-starter</artifactId></dependency><!--引用support模块--><dependency><groupId>com.hrms</groupId><artifactId>support</artifactId><version>0.0.1-SNAPSHOT</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

四、webapp的结构和需要注意的地方

1、需要注意的地方

1. 对于依赖注入不能再用以前的注解了，因为没有可以注入的服务实现，所以要改用@Reference

/*** @author 孔超* @date 2020/4/2 19:07*/
@Controller
public class UserController {@Reference//这不再用	@Autowired，因为你没实现类怎么注入private UserService userService;@RequestMapping("/")public String findAll(Model model) throws Exception {User user = userService.getById(1L);model.addAttribute("a", user.getAccount());return "index";}
}

2. 官网上在dubbo调用者配置上用了@EnableDubbo(scanBasePackages = "服务的接口")，所以我就在webapp的启动类上加上了

/*** @author 孔超* @date 2020/4/2 19:07*/
@SpringBootApplication
@EnableDubbo(scanBasePackages = "com.hrms.api.service")
public class WebappApplication {public static void main(String[] args) {SpringApplication.run(WebappApplication.class, args);}}

2、webapp的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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.hr</groupId><artifactId>hr-ms</artifactId><version>0.0.1-SNAPSHOT</version></parent><groupId>com.hrms</groupId><artifactId>webapp</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><name>webapp</name><description>人力资源管理系统的web层</description><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-freemarker</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency><dependency><groupId>com.alibaba.boot</groupId><artifactId>dubbo-spring-boot-starter</artifactId></dependency><!--需要引用api模块--><dependency><groupId>com.hrms</groupId><artifactId>api</artifactId><version>0.0.1-SNAPSHOT</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

五、分析分析模块之间的关系

上面就是各个模块之间引用的关系，感觉应该能看图看懂