快速预览
完整的POM文件示例:
<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>
<!-- The Basics -->
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>...</version>
<packaging>...</packaging>
<dependencies>...</dependencies>
<parent>...</parent>
<dependencyManagement>...</dependencyManagement>
<modules>...</modules>
<properties>...</properties>
<!-- Build Settings -->
<build>...</build>
<reporting>...</reporting>
<!-- More Project Information -->
<name>...</name>
<description>...</description>
<url>...</url>
<inceptionYear>...</inceptionYear>
<licenses>...</licenses>
<organization>...</organization>
<developers>...</developers>
<contributors>...</contributors>
<!-- Environment Settings -->
<issueManagement>...</issueManagement>
<ciManagement>...</ciManagement>
<mailingLists>...</mailingLists>
<scm>...</scm>
<prerequisites>...</prerequisites>
<repositories>...</repositories>
<pluginRepositories>...</pluginRepositories>
<distributionManagement>...</distributionManagement>
<profiles>...</profiles>
</project>
基础配置
项目基本信息
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.0</version>
<packaging>jar</packaging>
- groupId:唯一的组织名称或者项目名称
- artifactId:项目名称
- version:项目版本号
- packaging:项目的分发类型(jar、war等其它方式)
父类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/4.0.0
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.codehaus.mojo</groupId>
<artifactId>my-parent</artifactId>
<version>2.0</version>
<relativePath>../my-parent</relativePath>
</parent>
<artifactId>my-project</artifactId>
</project>
- relativePath:父项目的路径(相对路径)
多模块配置
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.codehaus.mojo</groupId>
<artifactId>my-parent</artifactId>
<version>2.0</version>
<packaging>pom</packaging>
<modules>
<module>my-project</module>
<module>another-project</module>
<module>third-project/pom-example.xml</module>
</modules>
</project>
- module:子模块artifactId
注:多模块项目父模块分发类型必须为POM
依赖配置
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.0</version>
<type>jar</type>
<scope>test</scope>
<optional>true</optional>
</dependency>
...
</dependencies>
...
</project>
构建时指定classifier,可以设置任意名称:
<build>
<finalName>${artifactId}-${version}</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<classifier>jdk5</classifier>
</configuration>
</plugin>
</plugins>
</build>
-
classifier:它表示在相同版本下针对不同的环境或者jdk使用的jar,如果配置了这个元素,则会将这个元素名在加在最后来查找相应的jar。
-
type:对应于从属工件的包装类型, 这默认为jar。
-
scope:maven的scope决定依赖的包是否加入本工程的classpath下,Maven提供了如下几种依赖范围
假设 A -> B, B -> C, 由 A -> B, 推出 A -> C,则C具有传递性
依赖范围 | 编译 | 测试 | 运行时 | 传递性 | 说明 |
---|---|---|---|---|---|
compile | Y | Y | Y | Y | 默认作用域,编译依赖作用于所有环境变量中 |
test | - | Y | - | - | 编译期不需要该依赖,仅作用于测试和运行环境中 |
provided | Y | Y | - | - | 类似于compile,但表示打包的时候可以不用包进去,期望JDK或容器在运行时提供它。</br> 它仅在编译和测试类路径中可用,并且不是传递性的。 |
runtime | - | Y | Y | Y | 他的范围表明该依赖不是编译所必需的,而是用于执行。</br> 它在运行时和测试类路径中,但不在编译类路径中。 |
system | Y | Y | - | Y | 和provide作用域类似,用于非Maven管理第三方jar依赖, 通常和systemPath配合使用 |
- systemPath:
仅在依赖范围是system时使用。 否则,如果设置此元素,构建将失败。
路径必须是绝对路径,因此建议使用属性来指定机器特定路径(更多属性如下),例如$ {java.home} / lib。
由于假定系统范围依赖关系是事先安装的,因此Maven不会检查项目的存储库,而是检查以确保文件存在。
如果没有,Maven将会失败,并建议您手动下载并安装它
- optional:仅限制包的传递依赖性,不影响包的classpath
依赖版本规范
- 1.0 : 软依赖1.0,可以匹配所有其它的依赖范围
- [1.0] : 强制性依赖 1.0
- (,1.0):x <=1.0
- [1.2, 1.3]:1.2<= x <=1.3
- [1.0, 2.0]: 1.0 <= x < 2.0
- [1.5,): x>=1.5
- (,1.0],[1.2,):x <= 1.0 或 x >= 1.2
- (,1.1),(1.1,):非 1.1 之外的所有版本
Exclusions
排除项包含一个或多个排除元素,每个排除元素都包含一个groupId和artifactId,表示要排除的依赖关系。
与可选或不可安装和使用的可选项不同,排除项主动将自己从依赖关系树中移除。
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-embedder</artifactId>
<version>2.0</version>
<exclusions>
<exclusion>
<groupId>org.apache.maven</groupId>
<artifactId>maven-core</artifactId>
</exclusion>
</exclusions>
</dependency>
...
</dependencies>
...
</project>
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-embedder</artifactId>
<version>3.1.0</version>
<exclusions>
<exclusion>
<groupId>*</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
...
</dependencies>
...
</project>
Properties
<project>
...
<properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
...
</project>
dependencyManagement
只是对版本进行管理,不会实际引入jar, 在依赖配置中无需指定版本。
<dependencyManagement>
<dependencies>
<!-- Thymeleaf模板 -->
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf</artifactId>
<version>3.0.7.RELEASE</version>
</dependency>
</dependencies>
</dependencyManagement>
Build Settings
Build
<build>
<defaultGoal>install</defaultGoal>
<directory>${basedir}/target</directory>
<finalName>${artifactId}-${version}</finalName>
<filters>
<filter>filters/filter1.properties</filter>
</filters>
...
</build>
-
defaultGoal:如果没有给出缺省目标(goal)或执行阶段(phase),则执行该目标。如果给出了一个目标,它应该被定义为它在命令行中(例如jar:jar)。 如果定义了阶段(例如安装),也是如此
-
directory:项目编译路径
-
finalName:项目包名称
-
filter:定义* .properties文件,其中包含适用于接受其设置的资源的属性列表(如下所述)。换句话说,过滤器文件中定义的“name = value”对将替换构建资源中的$ {name}字符串。 上面的例子定义了filter /目录下的filter1.properties文件。 Maven的默认过滤器目录是$ {basedir} / src / main / filters /
Resources
指定项目中资源位置,资源通常不是代码,它们不会被编译。
例如,一个Plexus项目需要一个配置文件(指定容器的组件配置)来存放在META-INF / plexus目录中。 尽管我们可以很容易地将这个文件放在src / main / resources / META-INF / plexus中,但是我们希望给Plexus自己的src / main / plexus目录。 为了使JAR插件正确地绑定资源,你需要指定类似于以下内容的资源
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<build>
...
<resources>
<resource>
<targetPath>META-INF/plexus</targetPath>
<filtering>false</filtering>
<directory>${basedir}/src/main/plexus</directory>
<includes>
<include>configuration.xml</include>
</includes>
<excludes>
<exclude>**/*.properties</exclude>
</excludes>
</resource>
</resources>
<testResources>
...
</testResources>
...
</build>
</project>
- targetPath:指定资源文件打包后路径
- directory:资源文件工程路径
- include:指定将文件作为资源包含在该指定目录下,使用*作为通配符。
- exclude:指定要忽略哪些文件
- testResources: 测试资源文件
Plugins
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<build>
...
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<extensions>false</extensions>
<inherited>true</inherited>
<configuration>
<classifier>test</classifier>
</configuration>
<dependencies>...</dependencies>
<executions>...</executions>
</plugin>
</plugins>
</build>
</project>
- extensions: 是否加载这个插件的扩展(生命周期扩展),默认是false。
- inherited: 是否让子模块继承这个插件, 默认为true。
- configuration:插件参数配置
- dependencies:插件依赖关系配置
- executions:插件目标绑定生命周期
Plugin Management
管理插件的版本,不会实际引入jar, 在插件配置中无需指定版本。
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<build>
...
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<id>pre-process-classes</id>
<phase>compile</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>pre-process</classifier>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
...
</build>
</project>
Extensions
自定义生命周期扩展
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<build>
...
<extensions>
<extension>
<groupId>org.apache.maven.wagon</groupId>
<artifactId>wagon-ftp</artifactId>
<version>1.0-alpha-3</version>
</extension>
</extensions>
...
</build>
</project>
Reporting
该配置通常用于项目文档和报告生成
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<reporting>
<plugins>
<plugin>
...
<reportSets>
<reportSet>
<id>sunlink</id>
<reports>
<report>javadoc</report>
</reports>
<inherited>true</inherited>
<configuration>
<links>
<link>http://java.sun.com/j2se/1.5.0/docs/api/</link>
</links>
</configuration>
</reportSet>
</reportSets>
</plugin>
</plugins>
</reporting>
...
</project>
更多项目信息
Licenses
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
<comments>A business-friendly OSS license</comments>
</license>
</licenses>
Organization
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<organization>
<name>Codehaus Mojo</name>
<url>http://mojo.codehaus.org</url>
</organization>
</project>
Developers
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<developers>
<developer>
<id>jdoe</id>
<name>John Doe</name>
<email>jdoe@example.com</email>
<url>http://www.example.com/jdoe</url>
<organization>ACME</organization>
<organizationUrl>http://www.example.com</organizationUrl>
<roles>
<role>architect</role>
<role>developer</role>
</roles>
<timezone>America/New_York</timezone>
<properties>
<picUrl>http://www.example.com/jdoe/pic</picUrl>
</properties>
</developer>
</developers>
...
</project>
Contributors
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<contributors>
<contributor>
<name>Noelle</name>
<email>some.name@gmail.com</email>
<url>http://noellemarie.com</url>
<organization>Noelle Marie</organization>
<organizationUrl>http://noellemarie.com</organizationUrl>
<roles>
<role>tester</role>
</roles>
<timezone>America/Vancouver</timezone>
<properties>
<gtalk>some.name@gmail.com</gtalk>
</properties>
</contributor>
</contributors>
...
</project>
Environment Settings
Issue Management
定义缺陷跟踪系统信息(Bugzilla,TestTrack,ClearQuest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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<issueManagement>
<system>Bugzilla</system>
<url>http://127.0.0.1/bugzilla/</url>
</issueManagement>
...
</project>
Continuous Integration Management
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<ciManagement>
<system>continuum</system>
<url>http://127.0.0.1:8080/continuum</url>
<notifiers>
<notifier>
<type>mail</type>
<sendOnError>true</sendOnError>
<sendOnFailure>true</sendOnFailure>
<sendOnSuccess>false</sendOnSuccess>
<sendOnWarning>false</sendOnWarning>
<configuration><address>continuum@127.0.0.1</address></configuration>
</notifier>
</notifiers>
</ciManagement>
...
</project>
Mailing Lists
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<mailingLists>
<mailingList>
<name>User List</name>
<subscribe>user-subscribe@127.0.0.1</subscribe>
<unsubscribe>user-unsubscribe@127.0.0.1</unsubscribe>
<post>user@127.0.0.1</post>
<archive>http://127.0.0.1/user/</archive>
<otherArchives>
<otherArchive>http://base.google.com/base/1/127.0.0.1</otherArchive>
</otherArchives>
</mailingList>
</mailingLists>
...
</project>
SCM
源代码软件版本管理信息配置
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<scm>
<connection>scm:svn:http://127.0.0.1/svn/my-project</connection>
<developerConnection>scm:svn:https://127.0.0.1/svn/my-project</developerConnection>
<tag>HEAD</tag>
<url>http://127.0.0.1/websvn/my-project</url>
</scm>
...
</project>
Repositories
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<repositories>
<repository>
<releases>
<enabled>false</enabled>
<updatePolicy>always</updatePolicy>
<checksumPolicy>warn</checksumPolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
<checksumPolicy>fail</checksumPolicy>
</snapshots>
<id>codehausSnapshots</id>
<name>Codehaus Snapshots</name>
<url>http://snapshots.maven.codehaus.org/maven2</url>
<layout>default</layout>
</repository>
</repositories>
<pluginRepositories>
...
</pluginRepositories>
...
</project>
Distribution Management
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<distributionManagement>
<repository>
<uniqueVersion>false</uniqueVersion>
<id>corp1</id>
<name>Corporate Repository</name>
<url>scp://repo/maven2</url>
<layout>default</layout>
</repository>
<snapshotRepository>
<uniqueVersion>true</uniqueVersion>
<id>propSnap</id>
<name>Propellors Snapshots</name>
<url>sftp://propellers.net/maven</url>
<layout>legacy</layout>
</snapshotRepository>
...
</distributionManagement>
...
</project>
Profiles
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<profiles>
<profile>
<id>test</id>
<activation>...</activation>
<build>...</build>
<modules>...</modules>
<repositories>...</repositories>
<pluginRepositories>...</pluginRepositories>
<dependencies>...</dependencies>
<reporting>...</reporting>
<dependencyManagement>...</dependencyManagement>
<distributionManagement>...</distributionManagement>
</profile>
</profiles>
</project>
Activation
<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
https://maven.apache.org/xsd/maven-4.0.0.xsd">
...
<profiles>
<profile>
<id>test</id>
<activation>
<activeByDefault>false</activeByDefault>
<jdk>1.5</jdk>
<os>
<name>Windows XP</name>
<family>Windows</family>
<arch>x86</arch>
<version>5.1.2600</version>
</os>
<property>
<name>sparrow-type</name>
<value>African</value>
</property>
<file>
<exists>${basedir}/file2.properties</exists>
<missing>${basedir}/file1.properties</missing>
</file>
</activation>
...
</profile>
</profiles>
</project>
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