Maven构建之依赖关系

上一节建立了两个项目，依赖关系是由app项目提交jar到maven库中，然后wabapp加载依赖库实现的.
这一节介绍使用项目间的依赖关系，比如我这个项目必须与另一个项目共存，那么可以建立依赖关系.
以下是在两个项目的上级目录建立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/maven-v4_0_0.xsd"> 
  
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.test</groupId>
     <artifactId>demo</artifactId>
     <packaging>pom</packaging>
     <version>1.0.0-SNAPSHOT</version>
     <name>CE Maven Demo</name>
     
     <modules>
         <module>app</module>
         <module>webapp</module>
     </modules>

     
   <dependencyManagement>
		<!--webx-3.0 related-->
		  <dependencies>
			
			<dependency>
				<groupId>com.test.app</groupId>
		    <artifactId>app</artifactId>
		    <version>1.0-SNAPSHOT</version>
			</dependency>
			
			<dependency>
				<groupId>com.test.app</groupId>
		    <artifactId>webapp</artifactId>
		    <version>1.0-SNAPSHOT</version>
			</dependency>

			
		 <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>servlet-api</artifactId>
         <version>2.4</version> 
         <scope>provided</scope>
     </dependency>
     
     <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
			
			</dependencies> 
	</dependencyManagement>  
 </project>

这里指定了gav,还指定了module,子模块依赖的架包及版本号.
子项目app:

<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.test</groupId>
		<artifactId>demo</artifactId>
		<version>1.0.0-SNAPSHOT</version>
	</parent>

  <groupId>com.test.app</groupId>
  <artifactId>app</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

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

  	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.6</source>
					<target>1.6</target>
				</configuration>
			</plugin>
		</plugins>
	</build>

  <dependencies>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
    </dependency>

  </dependencies>
</project>

指定了gav,还指定了其parent,引入的jar,还设置了maven的编译级别，因为maven还停留在1.3,现在基本上是1.6了。
子项目webapp:

<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.test</groupId>
		<artifactId>demo</artifactId>
		<version>1.0.0-SNAPSHOT</version>
	</parent>
	<groupId>com.test.app</groupId>
	<artifactId>webapp</artifactId>
	<packaging>war</packaging>
	<version>1.0-SNAPSHOT</version>
	<name>webapp Maven Webapp</name>
	<url>http://maven.apache.org</url>

	 <build>
		<finalName>webapp</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.6</source>
					<target>1.6</target>
				</configuration>
			</plugin>
		<!--
			<plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>tomcat-maven-plugin</artifactId>
                <configuration>
                    <url>http://127.0.0.1:9001/manager</url>
                    <server>test</server>
                    <path>/</path>
                </configuration>
            </plugin>
         -->
		</plugins>
	</build>

	<dependencies>

		<dependency>
			<groupId>com.test.app</groupId>
			<artifactId>app</artifactId>
		</dependency>

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>

	</dependencies>

</project>

这里所引用的项目代码与上一讲相同。
在两个项目的上级执行 mvn eclipse:eclipse 可以生成两个项目的eclipse项目
执行mvn package 可以打包，查看target可以看到app的jar已经打到webapp当中。
发布到tomcat下运行正常。