spring-boot 多模块的搭建

时间：2022-01-11 17:01:36

(1)项目的结构：搭建spring-boot多模块时，需要有一个父模块作为所有子模块的统一依赖，父模块有时只是一个文件夹，文件夹中放着父类的pom.xml文件，子模块的文件夹。比如我将建立3个子模块，我的目录结构是这样的：spring-boot 多模块的搭建

 在dataCollection文件夹下：有collection1,collection2,collection3和pom.xml.其中pom.xml是父类的pom.xml.

(2)创建项目：以eclipse为例，打开file->new->maven project->next->next->maven-archetype-quickstart->next->填写groupId和artifactId(项目名,这里dataCollection）->finish;

删除除pom.xml外的其他文件，在pom.xml中配置maven的相关依赖：

<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>cdmvs-dataColl</groupId>
	<artifactId>dataCollection</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>pom</packaging>
	<name>dataCollection</name>
	<url>http://maven.apache.org</url>
	<!-- 指向spring的依赖库 -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.3.0.RELEASE</version>
	</parent>
 		<!-- 设置版本的相关属性-->	<properties>		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>		<spring.version>4.2.3.RELEASE</spring.version>		<spring.boot.version>1.3.0.RELEASE</spring.boot.version>	</properties>
		<!--这里指明有3个子模块 -->	<modules>		<module>collection1</module>		<module>collection2</module>		<module>collection3</module>	</modules>
		<!-- 插件配置，标明jdk版本1.8 -->	<build>		<plugins>			<plugin>				<groupId>org.apache.maven.plugins</groupId>				<artifactId>maven-compiler-plugin</artifactId>				<version>3.6.0</version>				<configuration>					<source>1.8</source>					<target>1.8</target>				</configuration>			</plugin>		</plugins>	</build></project>
ok,一个父类的pom.xml就完成了。


接下来创建子项目collection1,collection2,collection3:

以colleciton1为例，collection2和collection3同理：file->new->maven project->next->next->maven-archetype-quickstart->next->填写groupId和artifactId(项目名,这里collection1）->finish;


colleciton1,2,3的pom.xml如下：

<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>cdmvs-dataColl</groupId>
	<artifactId>collection2</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>collection2</name>
	<url>http://maven.apache.org</url>
	<!-- 指明父类的依赖时dataCollection -->	<parent>		<groupId>cdmvs-dataColl</groupId>		<artifactId>dataCollection</artifactId>		<version>0.0.1-SNAPSHOT</version>	</parent>	<properties>		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>	</properties>	<dependencies>			</dependencies></project>


（3）接下来根据各模块的特定来配置各模块的pom.xml

比如本文我是collection1作为spring boot启动点，collection2做为controller 层，collection3暂时没想到,那我collection1则应该依赖springboot的相关配置依赖，ok,引入maven如下：

<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>cdmvs-dataColl</groupId>
	<artifactId>collection1</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>collection1</name>
	<url>http://maven.apache.org</url>
	<parent>
		<groupId>cdmvs-dataColl</groupId>
		<artifactId>dataCollection</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- automatically restart whenever files on the classpath change -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<optional>true</optional>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<!-- Import dependency management from Spring Boot -->
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-dependencies</artifactId>
				<version>1.3.5.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
</project>
collecicton2 层是controller,它的pom.xml是： 

<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>cdmvs-dataColl</groupId>
	<artifactId>collection2</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>collection2</name>
	<url>http://maven.apache.org</url>
	<parent>
		<groupId>cdmvs-dataColl</groupId>
		<artifactId>dataCollection</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
	</dependencies>
</project>
（4）jar包的maven依赖弄好了，该配置启动springboot类了，在collection1->src->main->java文件夹下新建App.java如下： 

package cdmvs_dataColl_collection3;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 * Hello world!
 *
 */
@Configuration
@SpringBootApplication
@ComponentScan(basePackages = "cdmvs_dataColl_collection2")//这里是什么鬼？
public class App 
{
    private static Logger logger= LoggerFactory.getLogger(App.class);
    public static void main( String[] args )
    {
        SpringApplication.run(App.class, args);
    }
}
在app.java 文件中有一个这样的注解：@ComponentScan(basePackages = "cdmvs_dataColl_collection2")
刚才不是说collection2做为我们的controller吗,那coolection1我怎么能找到colleciton2？那就通过 basePackages指向我们要扫描的文件包,同时将collection1通过依赖进来就行了。在collection2 src/main/java 下新建包 basePackages，同时写controller文件类AppController.java： 

package cdmvs_dataColl_collection2;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * Hello world!
 *
 */
@Controller
public class AppController 
{
    @RequestMapping(value="/hello", method=RequestMethod.GET)  
    @ResponseBody
    public String hello(){
       return "hello world";
   }
}
(不知道 @Controller和 @RequestMapping(value="/hello", method=RequestMethod.GET) ， @ResponseBody的，自己去http://www.javaworld.com/article/2078034/spring-framework/mastering-spring-mvc.html扫盲）

然后在collection1的pom.xml中将collection1引入： 

		<dependency>
			<groupId>cdmvs-dataColl</groupId>
			<artifactId>collection1</artifactId>
			<version>${project.version}</version>
		</dependency>
（5）启动 

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.3.0.RELEASE)

2017-03-22 20:21:38.594 DEBUG 16575 --- [           main] o.s.w.c.s.StandardServletEnvironment     : Adding [servletConfigInitParams] PropertySource with lowest search precedence
2017-03-22 20:21:39.842 DEBUG 16575 --- [           main] o.s.w.s.resource.ResourceUrlProvider     : Looking for resource handler mappings
2017-03-22 20:21:39.843 DEBUG 16575 --- [           main] o.s.w.s.resource.ResourceUrlProvider     : Found resource handler mapping: URL pattern="/**/favicon.ico", locations=[class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/], class path resource []], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver@1051817b]
2017-03-22 20:21:39.843 DEBUG 16575 --- [           main] o.s.w.s.resource.ResourceUrlProvider     : Found resource handler mapping: URL pattern="/webjars/**", locations=[class path resource [META-INF/resources/webjars/]], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver@35293c05]
2017-03-22 20:21:39.843 DEBUG 16575 --- [           main] o.s.w.s.resource.ResourceUrlProvider     : Found resource handler mapping: URL pattern="/**", locations=[ServletContext resource [/], class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/]], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver@620aa4ea]
2017-03-22 20:21:39.875  INFO 16575 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-03-22 20:21:39.876 DEBUG 16575 --- [           main] o.s.w.c.s.StandardServletEnvironment     : Adding [server.ports] PropertySource with highest search precedence
2017-03-22 20:21:39.877  INFO 16575 --- [           main] cdmvs_dataColl_collection3.App           : Started App in 6.579 seconds (JVM running for 6.782)

去 localhost:8080/hello看下。。。。










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