父pom配置：
<packaging>pom</packaging>
在父pom中配置依赖管理和插件管理
<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/4.0.0http://maven.apache.org/maven-v4_0_0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>cxxcode.maven</groupId>
 <artifactId>account-parent</artifactId>
 <packaging>pom</packaging>
 <version>0.0.1</version>
 <name>Account Parent</name>
 <url>http://maven.apache.org</url>

 <properties>
  <spring-version>2.5.6</spring-version>
  <junit-version>4.7</junit-version>
  <mail-version>1.4.1</mail-version>
  <greenmail-version>1.3.1b</greenmail-version>
  <dom4j-version>1.6.1</dom4j-version>
  <surefire-version>2.5</surefire-version>
 </properties>

 <!--
  依赖管理dependencyManagement
   如果不使用依赖管理，子pom会继承父pom中配置的所有依赖，子pom中只需配置自己特需的依赖就行了，
   这样虽然简化了子pom的配置，但是强制性给子pom加上多余的依赖。
   
   使用依赖管理，子pom中要配置自己需要的依赖，如果这些依赖在父pom中配置了，
   子pom只需指定这些依赖的groupId和artifactId
   
   
  依赖管理的导入
   将proj-A中的依赖管理导入此pom的依赖管理中
   
   <scope>import</scope>只用在依赖管理配置中，且<type>pom</type>
  
   <dependencyManagement>
    <dependencies>
     <dependency>
      <groupId>cxxcode.mave</groupId>
      <artifactId>proj-A</artifactId>
      <version>0.0.1</version>
      <type>pom</type>
      <scope>import</scope>
     </dependency>
    </dependencies>
   </dependencyManagement>
 -->
 <dependencyManagement>
  <dependencies>
   <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>${spring-version}</version>
   </dependency>
   <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
    <version>${spring-version}</version>
   </dependency>
   <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${spring-version}</version>
   </dependency>
   <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
    <version>${spring-version}</version>
   </dependency>
   <dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>${mail-version}</version>
   </dependency>

   <dependency>
    <groupId>dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>${dom4j-version}</version>
   </dependency>

   <dependency>
    <groupId>com.icegreen</groupId>
    <artifactId>greenmail</artifactId>
    <version>${greenmail-version}</version>
    <scope>test</scope>
   </dependency>
   <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>${junit-version}</version>
    <scope>test</scope>
   </dependency>
  </dependencies>
 </dependencyManagement>
 
 <build>
  <!-- 插件管理pluginManagement -->
  <pluginManagement>
   <plugins>
    <!-- 编译插件 -->
    <plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-compiler-plugin</artifactId>
     <configuration>
      <source>1.5</source>
      <target>1.5</target>
      <fork>true</fork><!-- true允许修改jdk编码版本 -->
      <encoding>UTF-8</encoding>
      <!-- 跳过测试编译
      <skip>false</skip> -->
     </configuration>
    </plugin>
    
    <!-- 生成源码jar -->
    <plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-source-plugin</artifactId>
     <executions>
      <execution>
       <phase>verify</phase>
       <goals>
        <goal>jar-no-fork</goal>
       </goals>
      </execution>
     </executions>
    </plugin>
    
    <!-- 复制主资源文件到主输出目录 -->
    <plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-resources-plugin</artifactId>
     <configuration>
      <encoding>UTF-8</encoding>
     </configuration>
    </plugin>
    
    <!-- 测试插件 -->
    <plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-surefire-plugin</artifactId>
     <version>${surefire-version}</version>
     <configuration>
      <!-- 跳过测试
      <skip>true</skip> -->
     </configuration>
    </plugin>
   </plugins>
  </pluginManagement>
 </build>
</project>
==================================

子pom

<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/4.0.0http://maven.apache.org/maven-v4_0_0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <!-- 独自定义
 <groupId>cxxcode.maven</groupId>
 <artifactId>account-email</artifactId>
 <packaging>jar</packaging>
 <version>0.0.1</version>
 <name>Account Email</name>
  -->
 
 <!--
  parent
  继承父pom
   子pom的groupId、version、依赖等信息继承父pom
   relativePath 父pom的位置，默认../pom.xml
   
  可继承的pom元素
   groupId   项目组Id
   version   项目版本
   description  项目描述
   organization 项目的组织信息
   inceptionYear 项目的创建年份
   url    项目的url
   developers  项目的开发者
   contributors 项目的贡献者
   distributionManagement 项目的部署配置
   issueManagement 项目的缺陷跟踪系统信息
   ciManagement 项目的持续继承系统信息
   scm    项目的版本控制系统信息
   mailingLists 项目的邮件列表信息
   properties  自定义的maven属性
   dependencies 项目的依赖配置
   dependencyManagement 项目的依赖管理配置
   repositories 项目的仓库配置
   build   包括项目的源码目录配置，输出目录配置、插件配置、插件管理配置等
   reporting  包括项目的报告输出目录配置、报告插件配置等
   
  -->
 <artifactId>account-email</artifactId>
 <packaging>jar</packaging>
 <name>Account Email</name>
 
 <parent>
  <groupId>cxxcode.maven</groupId>
  <artifactId>account-parent</artifactId>
  <version>0.0.1</version>
  <relativePath>../CXXMaven_AccountParent/pom.xml</relativePath>
 </parent>

 <dependencies>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-core</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-beans</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-context</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-context-support</artifactId>
  </dependency>
  <dependency>
   <groupId>javax.mail</groupId>
   <artifactId>mail</artifactId>
  </dependency>
  <dependency>
   <groupId>com.icegreen</groupId>
   <artifactId>greenmail</artifactId>
   <scope>test</scope>
  </dependency>
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
  </dependency>

 </dependencies>
 <build>
  <plugins>
   <!-- 编译插件 -->
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
   </plugin>

   <!-- 生成可运行的jar -->
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <executions>
     <execution>
      <phase>package</phase>
      <goals>
       <goal>shade</goal>
      </goals>
      <configuration>
       <transformers>
        <transformer
     implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
         <mainClass>
          com.cxx.maven.App
         </mainClass>
        </transformer>
       </transformers>
      </configuration>
     </execution>
    </executions>
   </plugin>

   <!-- 生成源码jar -->
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-source-plugin</artifactId>
   </plugin>
  </plugins>
 </build>

</project>