maven依赖管理_依赖管理和Maven-蒲公英云

maven依赖管理_依赖管理和Maven

maven依赖管理

Maven伟大而成熟。几乎所有事物都总有解决方案。您可能在组织项目上遇到的主要情况是依赖管理。而不是每个项目都具有自己的依赖关系，您需要一种集中的方式来继承那些依赖关系。

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在这种情况下，您可以在父舞会上声明托管依赖项。在我的示例中，我只想包含Akka流依赖项。

<? 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 >org.example</ groupId > 
     < artifactId >maven-dependency-management</ artifactId > 
     < packaging >pom</ packaging > 
     < version >1.0-SNAPSHOT</ version > 
     < properties > 
         < akka.version >2.5.31</ akka.version > 
         < akka.http.version >10.1.11</ akka.http.version > 
         < scala.binary.version >2.12</ scala.binary.version > 
     </ properties > 
     < modules > 
         < module >child-one</ module > 
     </ modules > 
     < dependencyManagement > 
         < dependencies > 
             < dependency > 
                 < groupId >com.typesafe.akka</ groupId > 
                 < artifactId >akka-stream_2.12</ artifactId > 
                 < version >${akka.version}</ version > 
             </ dependency > 
             < dependency > 
                 < groupId >com.typesafe.akka</ groupId > 
                 < artifactId >akka-http_2.12</ artifactId > 
                 < version >${akka.http.version}</ version > 
             </ dependency > 
             < dependency > 
                 < groupId >com.typesafe.akka</ groupId > 
                 < artifactId >akka-http-spray-json_2.12</ artifactId > 
                 < version >${akka.http.version}</ version > 
             </ dependency > 
         </ dependencies > 
     </ dependencyManagement >  </ project >

我使用的是依赖性管理模块。

现在，子项目无需指定版本即可包含这些库。派生和管理版本至关重要。如果版本不兼容，可能会带来许多不愉快的惊喜。

现在，在子模块上，由于版本是子模块，因此声明了没有版本的版本。

<? 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 " > 
     < parent > 
         < artifactId >maven-dependency-management</ artifactId > 
         < groupId >org.example</ groupId > 
         < version >1.0-SNAPSHOT</ version > 
     </ parent > 
     < modelVersion >4.0.0</ modelVersion > 
     < artifactId >child-one</ artifactId > 
     < dependencies > 
         < dependency > 
             < groupId >com.typesafe.akka</ groupId > 
             < artifactId >akka-stream_2.12</ artifactId > 
         </ dependency > 
         < dependency > 
             < groupId >com.typesafe.akka</ groupId > 
             < artifactId >akka-http_2.12</ artifactId > 
         </ dependency > 
         < dependency > 
             < groupId >com.typesafe.akka</ groupId > 
             < artifactId >akka-http-spray-json_2.12</ artifactId > 
         </ dependency > 
     </ dependencies >  </ project >

另一方面，有时我们想使用另一个项目的依赖关系管理，而不必将该项目作为我们的父项。在这些情况下，当您已经具有父项目时，您需要包括来自父项目的依赖关系管理。

<? 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 >org.example</ groupId > 
     < artifactId >independent-project</ artifactId > 
     < version >1.0-SNAPSHOT</ version > 
     < dependencyManagement > 
         < dependencies > 
             < dependency > 
                 < artifactId >maven-dependency-management</ artifactId > 
                 < groupId >org.example</ groupId > 
                 < version >1.0-SNAPSHOT</ version > 
                 < type >pom</ type > 
                 < scope >import</ scope > 
             </ dependency > 
         </ dependencies > 
     </ dependencyManagement > 
     < dependencies > 
         < dependency > 
             < groupId >com.typesafe.akka</ groupId > 
             < artifactId >akka-stream_2.12</ artifactId > 
         </ dependency > 
         < dependency > 
             < groupId >com.typesafe.akka</ groupId > 
             < artifactId >akka-http_2.12</ artifactId > 
         </ dependency > 
         < dependency > 
             < groupId >com.typesafe.akka</ groupId > 
             < artifactId >akka-http-spray-json_2.12</ artifactId > 
         </ dependency > 
     </ dependencies >  </ project >

如您所见

< dependencyManagement > 
         < dependencies > 
             < dependency > 
                 < artifactId >maven-dependency-management</ artifactId > 
                 < groupId >org.example</ groupId > 
                 < version >1.0-SNAPSHOT</ version > 
                 < type >pom</ type > 
                 < scope >import</ scope > 
             </ dependency > 
         </ dependencies > 
     </ dependencyManagement >