Eclipse下使用maven搭建多模块项目

暂时将项目分为如下几层：

domain（域模型层）、dao（数据库访问层）、service（业务逻辑层）、web（表现层），有需要再另行添加（如common等）；

目录结构：

一、app

该层为父层，管理其它模块层。

1.1 创建Maven Project

1.2 选择maven-archetype-quickstart

1.3 删除src文件夹，修改pom.xml文件，将<packaging>jar</packaging>修改为<packaging>pom</packaging>，pom表示它是一个被继承的模块

修改之后的配置文件：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.bdong</groupId>
  <artifactId>app</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <name>app</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <span style="color:#ff0000;"><strong><packaging>pom</packaging></strong></span>

  <modules>
    <module>app-domain</module>
    <module>app-dao</module>
    <module>app-service</module>
    <module>app-web</module>
  </modules>
</project>

二、app-domain

2.1 创建Maven Module

2.2 选择maven-archetype-quickstart

2.3 修改app-domain目录中的pom.xml文件，把<groupId>com.bdong</groupId>和<version>0.0.1-SNAPSHOT</version>去掉，加上<packaging>jar</packaging>，groupId和version会继承app中的groupId和version，packaging设置打包方式为jar

修改后的配置文件：

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.bdong</groupId>
    <artifactId>app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>

  <artifactId>app-domain</artifactId>
  <strong><span style="color:#ff0000;"><packaging>jar</packaging></span></strong>

  <name>app-domain</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project><strong>
</strong>

三、app-dao

3.1 创建Maven Module

3.2 选择maven-archetype-quickstart

3.3 修改app-dao目录中的pom.xml文件，，把<groupId>com.bdong</groupId>和<version>0.0.1-SNAPSHOT</version>去掉，加上<packaging>jar</packaging>，因为groupId和version会继承app中的groupId和version，packaging设置打包方式为jar，同时添加对app-domain模块的依赖

修改后的配置文件：

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.bdong</groupId>
    <artifactId>app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>

  <artifactId>app-dao</artifactId>
  <packaging>jar</packaging>

  <name>app-dao</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <!--依赖app-domain模块-->
    <dependency>
        <groupId>com.bdong</groupId>
        <artifactId>app-domain</artifactId>
        <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

</project>

四、app-service

4.1 创建Maven Module

4.2 选择maven-archetype-quickstart

4.3  修改app-service目录中的pom.xml文件，，把<groupId>com.bdong</groupId>和<version>0.0.1-SNAPSHOT</version>去掉，加上<packaging>jar</packaging>，packaging设置打包方式为jar，同时添加对app-dao模块的依赖，app-service依赖app-dao和app-domain，但是只需添加app-dao的依赖即可，因为app-dao已经依赖了app-domain。

修改后的配置文件：

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.bdong</groupId>
    <artifactId>app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>

  <artifactId>app-service</artifactId>
  <packaging>jar</packaging>

  <name>app-service</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
        <groupId>com.bdong</groupId>
        <artifactId>app-dao</artifactId>
        <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

五、app-web

5.1 创建Maven Module

5.2 选择maven-archetype-webapp

5.3 修改app-web目录中的pom.xml文件，，把<groupId>com.bdong</groupId>和<version>0.0.1-SNAPSHOT</version>去掉，修改打包方式为<packaging>war</packaging>，添加对app-service模块的依赖

修改后的配置文件：

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.bdong</groupId>
    <artifactId>app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>

  <artifactId>app-web</artifactId>
 <strong> <span style="color:#ff0000;"><packaging>war</packaging></span></strong>

  <name>app-web Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
        <groupId>com.bdong</groupId>
        <artifactId>app-service</artifactId>
        <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>app-web</finalName>
  </build>
</project>

六，编译

控制台打印信息：

七、运行

7.1 添加app-web到tomcat中

7.2 运行tomcat，然后在浏览器中访问:localhost:8080/app-web

最终，目录结构为：

项目github地址：https://github.com/baidong0228/Study/tree/master/app

使用命令搭建多模块可参考：http://www.cnblogs.com/xdp-gacl/p/4242221.html