maven-publish插件的使用

maven-publish插件

maven-publish是一个Gradle插件，可以我们的编译的输出物（artifacts）发布到Apache Maven仓库当中，例如aar,jar等library发布到仓库当中，我们可以通过gradle或者maven进行远程依赖使用。

maven-publish的使用

引入插件

在需要用到的模块的build.gradle文件加入这句

apply plugin: 'maven-publish'

使用插件

引入插件后，我们可以扩展一些我们自定义的属性以及任务。引入插件的模块中，我们可以通过复写publishing节点(后面会有example)。

pulishing 内部，我们可以复写两个配置publications 和repositories。

publicaions

顾名思义，就是配置maven-publishing插件的输出物。

publishing {
  publications {
    myPublicationName(MavenPublication) {
      // Configure the publication here
    }
  }
}

publicaions主要包含四种类型的配置项：

• A component：继承自MavenPublication
• Custom artifacts ：自定义的输出物
• Standard metadata ：metadata信息，如groupId，version，artifactId
• Other contents of the POM file ：用过maven的人应该知道这个文件

example1:

publishing {
        publications {
            maven(MavenPublication) {
                groupId = 'org.gradle.sample'
                artifactId = 'project1-sample'
                version = '1.1'

                from components.java
            }
        }
    }

example2:

publishing {
    publications {
        mavenJava(MavenPublication) {
            pom {
                name = 'My Library'
                description = 'A concise description of my library'
                url = 'http://www.example.com/library'
                properties = [
                    myProp: "value",
                    "prop.with.dots": "anotherValue"
                ]
                licenses {
                    license {
                        name = 'The Apache License, Version 2.0'
                        url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
                    }
                }
                developers {
                    developer {
                        id = 'johnd'
                        name = 'John Doe'
                        email = '[email protected]'
                    }
                }
                scm {
                    connection = 'scm:git:git://example.com/my-library.git'
                    developerConnection = 'scm:git:ssh://example.com/my-library.git'
                    url = 'http://example.com/my-library/'
                }
            }
        }
    }
}

example3:

apply plugin: "java"
apply plugin: "maven-publish"

task sourceJar(type: Jar) {
  from sourceSets.main.allJava
  classifier "sources"
}

publishing {
  publications {
    myPublication(MavenPublication) {
      from components.java
      artifact sourceJar
      pom {
        name = "Demo"
        description = "A demonstration of Maven POM customization"
        url = "http://www.example.com/project"
        licenses {
          license {
            name = "The Apache License, Version 2.0"
            url = "http://www.apache.org/licenses/LICENSE-2.0.txt"
          }
        }
        developers {
          developer {
            id = "johnd"
            name = "John Doe"
            email = "[email protected]"
          }
        }
        scm {
          connection = "scm:svn:http://subversion.example.com/svn/project/trunk/"
          developerConnection = "scm:svn:https://subversion.example.com/svn/project/trunk/"
          url = "http://subversion.example.com/svn/project/trunk/"
        }
      }
    }
  }
}

ps：详细参考这里

repositiories

顾名思义，就是用来配置maven-publishing仓库的信息，即输出目的地
仓库的配置相对简单，只需要两项：

• URL (必填)
• Name (可选)

example1：

publishing {
    repositories {
        maven {
            // change to point to your repo, e.g. http://my.org/repo
            url = "$buildDir/repo"
        }
    }
}

example2:

publishing {
    repositories {
        maven {
            def releasesRepoUrl = "$buildDir/repos/releases"
            def snapshotsRepoUrl = "$buildDir/repos/snapshots"
            url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
        }
    }
}

配置完以上信息之后，就可以在gradle的Task列表中看到我们的task了。双击便可执行。

publishToMavenLocal

publishToMavenLocal是maven-publish插件自动创建的的一个任务，它会将Moudle，POM，和metadata信息发布到$USER_HOME/.m2/repository。

完整的example

plugins {
    id 'java-library'
    id 'maven-publish'
    id 'signing'
}

group = 'com.example'
version = '1.0'

task sourcesJar(type: Jar) {
    from sourceSets.main.allJava
    archiveClassifier = 'sources'
}

task javadocJar(type: Jar) {
    from javadoc
    archiveClassifier = 'javadoc'
}

publishing {
    publications {
        mavenJava(MavenPublication) {
            artifactId = 'my-library'
            from components.java
            artifact sourcesJar
            artifact javadocJar
            versionMapping {
                usage('java-api') {
                    fromResolutionOf('runtimeClasspath')
                }
                usage('java-runtime') {
                    fromResolutionResult()
                }
            }
            pom {
                name = 'My Library'
                description = 'A concise description of my library'
                url = 'http://www.example.com/library'
                properties = [
                    myProp: "value",
                    "prop.with.dots": "anotherValue"
                ]
                licenses {
                    license {
                        name = 'The Apache License, Version 2.0'
                        url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
                    }
                }
                developers {
                    developer {
                        id = 'johnd'
                        name = 'John Doe'
                        email = '[email protected]'
                    }
                }
                scm {
                    connection = 'scm:git:git://example.com/my-library.git'
                    developerConnection = 'scm:git:ssh://example.com/my-library.git'
                    url = 'http://example.com/my-library/'
                }
            }
        }
    }
    repositories {
        maven {
            // change URLs to point to your repos, e.g. http://my.org/repo
            def releasesRepoUrl = "$buildDir/repos/releases"
            def snapshotsRepoUrl = "$buildDir/repos/snapshots"
            url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
        }
    }
}

signing {
    sign publishing.publications.mavenJava
}


javadoc {
    if(JavaVersion.current().isJava9Compatible()) {
        options.addBooleanOption('html5', true)
    }
}

对应的生成：

• The POM: my-library-1.0.pom

• The primary JAR artifact for the Java component: my-library-1.0.jar

• The sources JAR artifact that has been explicitly configured: my-library-1.0-sources.jar

• The Javadoc JAR artifact that has been explicitly configured: my-library-1.0-javadoc.jar