分模块构建工程

上一节中，利用maven构建了一个最基础的ssh项目，这一节将对该项目进行分模块构建工程。

通过聚合和继承构建

继承：创建一个parent工程将通用的pom配置抽取出来聚合：聚合多个模块运行

需求

将ssh工程拆分为多个模块开发

dao + service + web

理解继承和聚合

通常继承和聚合同时使用

继承

继承是为了消除重复，如果将dao、service、web分开创建独立的工程则每个工程的pom.xml文件中的内容存在重复，比如：设置编译版本、锁定spring的版本的等，可以将这些重复的配置提取出来在父工程的pom.xml中定义。

聚合

项目开发通常是分组分模块开发，每个模块开发完成要运行整个工程需要将每个模块聚合在一起运行，比如：dao、service、web三个工程最终会打一个独立的war运行。

案例实现

maven-parent父模块

创建父工程

注意，父工程只是一个pom工程

定义pom.xml

在父工程的pom.xml中抽取一些重复的配置的，比如：锁定jar包的版本、设置编译版本等。

<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.yaolong.maven</groupId>
  <artifactId>maven-parent</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>parent project</name>
  
  <!-- 属性 -->
	<properties>
		<spring.version>4.2.4.RELEASE</spring.version>
		<hibernate.version>5.0.7.Final</hibernate.version>
		<struts.version>2.3.24</struts.version>
	</properties>
	<dependencyManagement>
		<dependencies>
			<!-- 统一依赖构件版本 -->
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-context</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-aspects</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-orm</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-test</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-web</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.hibernate</groupId>
				<artifactId>hibernate-core</artifactId>
				<version>${hibernate.version}</version>
			</dependency>
			<dependency>
				<groupId>org.apache.struts</groupId>
				<artifactId>struts2-core</artifactId>
				<version>${struts.version}</version>
			</dependency>
			<dependency>
				<groupId>org.apache.struts</groupId>
				<artifactId>struts2-spring-plugin</artifactId>
				<version>${struts.version}</version>
			</dependency>
			<dependency>
				<groupId>org.apache.struts</groupId>
				<artifactId>struts2-json-plugin</artifactId>
				<version>${struts.version}</version>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<finalName>maven-web</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.7</source>
					<target>1.7</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
		</plugins>
	</build>
  
  
</project>

将父工程发布至仓库

父工程创建完成执行maven-install将父工程发布到仓库方便子工程继承：

查看本地仓库，看到maven-parent已经被安装

maven-dao子模块

创建dao子模块

选择maven模块：

这里指定模块名称，选择父工程，选择“跳过骨架选择”：

定义pom.xml

dao模块的pom.xml文件中需要继承父模块，添加持久层需要的依赖坐标：

<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>
  
  <parent>
    <groupId>com.yaolong.maven</groupId>
    <artifactId>maven-parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  
  <artifactId>maven-dao</artifactId>
  <packaging>jar</packaging>
  
    <dependencies>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
		</dependency>
		
		<!-- 数据库驱动 -->

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.6</version>
			<scope>runtime</scope>
		</dependency>
		<!-- c3p0 -->

		<dependency>
			<groupId>c3p0</groupId>
			<artifactId>c3p0</artifactId>
			<version>0.9.1.2</version>
		</dependency>
		<!-- 日志 -->
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.2</version>
		</dependency>
		<!-- junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.9</version>
			<scope>test</scope>
		</dependency>
	</dependencies>
</project>

dao接口

将maven-web工程中的dao接口及domain类拷贝到src/main/java中：

配置文件

将applicationContext.xml拆分出一个applicationContext-dao.xml，此文件中只配置dao

applicationContext-dao.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd 
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop.xsd 
	http://www.springframework.org/schema/tx  
	http://www.springframework.org/schema/tx/spring-tx.xsd">


	<!-- dao -->
	<bean id="newsDao" class="com.yaolong.maven.demo.dao.impl.NewsDaoImpl">
		<property name="sessionFactory" ref="sessionFactory"/>
	</bean>

</beans>

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd 
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop.xsd 
	http://www.springframework.org/schema/tx  
	http://www.springframework.org/schema/tx/spring-tx.xsd">

	<!-- 数据库连接池 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="com.mysql.jdbc.Driver" />
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/hibernatedb" />
		<property name="user" value="root" />
		<property name="password" value="12345" />
	</bean>

	<!-- 配置sessionFactory -->
	<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
		<!-- 依赖dataSource -->
		<property name="dataSource" ref="dataSource"/>
		<!-- 创建工厂需要加载hibernate映射文件 -->
		<property name="configLocations" value="classpath:hibernate.cfg.xml"></property>
	</bean>
	
</beans>

单元测试

package com.yaolong.maven.demo.dao.impl;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.yaolong.maven.demo.dao.NewsDao;
import com.yaolong.maven.demo.domain.News;

@ContextConfiguration(locations = { "classpath:applicationContext.xml", "classpath:applicationContext-dao.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class NewsDaoImplTest {
	
	@Autowired
	private NewsDao newsDao;

	@Before
	public void setUp() throws Exception {
	}

	@Test
	public void testFindNewsById() {
		News news = newsDao.findNewsById(1);
		System.out.println(news.getContent());
	}

}

项目目录结构

maven-service子模块

创建service子模块

方法同maven-dao模块创建方法，模块名称为maven-service。

定义pom.xml

<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>
  <parent>
    <groupId>com.yaolong.maven</groupId>
    <artifactId>maven-parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>maven-service</artifactId>
  <packaging>jar</packaging>
    <dependencies>
  		<!-- junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.9</version>
			<scope>test</scope>
		</dependency>
		<!-- 依赖dao -->
		<dependency>
			<groupId>com.yaolong.maven</groupId>
			<artifactId>maven-dao</artifactId>
			<version>0.0.1-SNAPSHOT</version>
		</dependency>
	</dependencies>
</project>

创建applicationContext-service.xml，此文件中定义的service。

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd 
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop.xsd 
	http://www.springframework.org/schema/tx  
	http://www.springframework.org/schema/tx/spring-tx.xsd">

	<!-- service -->
	<bean id="newsService" class="com.yaolong.maven.demo.service.impl.NewsServiceImpl">
		<property name="newsDao" ref="newsDao"/>
	</bean>
	
</beans>

NewsService.java

package com.yaolong.maven.demo.service;

import com.yaolong.maven.demo.domain.News;

public interface NewsService {

	public News findNewsById(Integer newsId);
	
}

NewsServiceImpl.java

package com.yaolong.maven.demo.service.impl;

import com.yaolong.maven.demo.dao.NewsDao;
import com.yaolong.maven.demo.domain.News;
import com.yaolong.maven.demo.service.NewsService;

public class NewsServiceImpl implements NewsService {

	private NewsDao newsDao;

	public void setNewsDao(NewsDao newsDao) {
		this.newsDao = newsDao;
	}

	@Override
	public News findNewsById(Integer newsId) {
		return this.newsDao.findNewsById(newsId);
	}

}

单元测试

package com.yaolong.maven.demo.service.impl;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.yaolong.maven.demo.domain.News;
import com.yaolong.maven.demo.service.NewsService;

@ContextConfiguration(locations = {"classpath:applicationContext.xml","classpath:applicationContext-service.xml","classpath:applicationContext-dao.xml" })
@RunWith(SpringJUnit4ClassRunner.class)
public class NewsServiceImplTest {

	@Autowired
	private NewsService newsService;

	@Before
	public void setUp() throws Exception {
	}

	@Test
	public void testFindCustomerById() {
		News news = newsService.findNewsById(1);
		System.out.println(news.getContent());
	}
	
	
}

项目目录结构

maven-web子模块

创建web子模块

方法同maven-dao模块创建方法，模块名称为maven-web。

action

package com.yaolong.maven.demo.action;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
import com.yaolong.maven.demo.domain.News;
import com.yaolong.maven.demo.service.NewsService;

public class NewsAction extends ActionSupport {

	private static final long serialVersionUID = 1L;
	
	private News news;
	
	public News getNews() {
		return news;
	}

	public void setNews(News news) {
		this.news = news;
	}

    private NewsService newsService;
    
	public NewsService getNewsService() {
		return newsService;
	}

	public void setNewsService(NewsService newsService) {
		this.newsService = newsService;
	}

	//根据主键获取新闻信息
	public String queryNews(){
		String id = ServletActionContext.getRequest().getParameter("id");
		 news = newsService.findNewsById(Integer.valueOf(id));
		 return SUCCESS;
	}
    
    

}

applicationContext-web.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd 
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop.xsd 
	http://www.springframework.org/schema/tx  
	http://www.springframework.org/schema/tx/spring-tx.xsd">

	 <!-- action -->
	<bean id="newsAction" class="com.yaolong.maven.demo.action.NewsAction" scope="prototype">
		<property name="newsService" ref="newsService"/>
	</bean>
	
</beans>

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd 
	http://www.springframework.org/schema/context 
	http://www.springframework.org/schema/context/spring-context.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop.xsd 
	http://www.springframework.org/schema/tx  
	http://www.springframework.org/schema/tx/spring-tx.xsd">

	
	<import resource="classpath:applicationContext-web.xml"/>
	<import resource="classpath:applicationContext-service.xml"/>
	<import resource="classpath:applicationContext-dao.xml"/>
		
</beans>

模块聚合

修改父工程的pom.xml，添加：

<!-- 由于父工程要聚合子工程，配置modules -->
   <modules>
    <!-- 在modules中配置相对路径，相对父工程pom.xml的路径找到子工程的pom.xml -->
   	<module>maven-dao</module>
   	<module>maven-service</module>
   	<module>maven-web</module>
   </modules>

注意：上边module中配置的路径，此路径是相对父工程的pom.xml文件找子工程的pom.xml文件的路径。

运行调试

方法1：

在maven-web工程的pom.xml中配置tomcat插件运行运行maven-web工程它会从本地仓库下载依赖的jar包，所以当maven-web依赖的jar包内容修改了必须及时发布到本地仓库，比如：maven-web依赖的maven-service修改了，需要及时将maven-service发布到本地仓库。

方法2：

在父工程的pom.xml中配置tomcat插件运行，自动聚合并执行

推荐方法2，如果子工程都在本地，采用方法2则不需要子工程修改就立即发布到本地仓库，父工程会自动聚合并使用最新代码执行。

注意：如果子工程和父工程中都配置了tomcat插件，运行的端口和路径以子工程为准。

maven笔记（三）

分模块构建工程

需求

将ssh工程拆分为多个模块开发

理解继承和聚合

案例实现

maven-parent父模块

创建父工程

定义pom.xml

将父工程发布至仓库

maven-dao子模块

创建dao子模块

定义pom.xml

dao接口

配置文件

单元测试

项目目录结构

maven-service子模块

创建service子模块

定义pom.xml

单元测试

项目目录结构

maven-web子模块

创建web子模块

模块聚合

运行调试

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