发布开源库到Maven Central

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JCenter宣布停用后，今后只能发布到Maven Central，相对JCenter，首次发布到Maven Central要麻烦很多

注册Sonatype账号

https://issues.sonatype.org/secure/ForgotLoginDetails.jspa

创建问题

填写项目信息，Group Id可以填自己的域名，或者com.github.自己的用户名，后面会验证所有权

验证Group Id

几分钟后会有一个机器人回复，要求验证域名的所有权

  • 用域名作为Group Id：域名解析一个TXT记录，内容就是当前问题编号
  • 用Github用户名作为Group Id：创建一个名称为当前问题编号的仓库

将问题标记为打开

等待几分钟会回复验证成功，就可以上传项目了

发布项目

在要工程根目录创建publish.gradle，粘贴模板，此模板支持Android、Java、Kotlin、Gradle Plugin
publish.gradle代码地址：https://gist.github.com/xiandanin/6a215a24acee9e8194bc4668b3e8f133

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apply plugin: 'maven-publish'
apply plugin: 'signing'

Properties localProperties = new Properties()
// 合并local.properties
localProperties.load(project.rootProject.file('local.properties').newDataInputStream())
localProperties.each { name, value -> project.ext[name] = value }

Map<String, String> projectProperties = new HashMap<>()
// 合并project.ext
projectProperties.putAll(project.ext.getProperties())
// 合并rootProject.ext
rootProject.ext.getProperties().each { name, value -> if (!projectProperties.containsKey(name)) projectProperties.put(name, value) }
//println(properties)
def mavenUsername = localProperties.getProperty("sonatype.username")
def mavenPassword = localProperties.getProperty("sonatype.password")
def projectGroupId = projectProperties.get('groupId')
def projectArtifactId = project.getName()
def projectVersionName = projectProperties.getOrDefault('version', project.extensions.findByName("android")["defaultConfig"].versionName)
def projectDescription = projectProperties.get('description')
def projectGitUrl = projectProperties.get('gitUrl')
def projectLicense = projectProperties.get('license')
def projectLicenseUrl = projectLicense ? "https://opensource.org/licenses/${projectLicense.toString().replace(" ", "-")} " : null

def developerAuthorId = mavenUsername
def developerAuthorName = mavenUsername
def developerAuthorEmail = projectProperties.get('authorEmail')

println("${mavenUsername} ${mavenPassword} - ${projectGroupId}:${projectArtifactId}:${projectVersionName}")
println("${projectLicense} - ${projectLicenseUrl}")

if (!projectGroupId || !projectArtifactId || !projectVersionName) {
    println("${project.name} 缺少项目信息")
    return
}
if (!mavenUsername || !mavenPassword || !localProperties.containsKey("signing.keyId") || !localProperties.containsKey("signing.password") || !localProperties.containsKey("signing.secretKeyRingFile")) {
    println("${project.name} 缺少认证信息")
    return
}
if (!projectDescription || !projectGitUrl || !projectLicense || !projectLicenseUrl || !developerAuthorId || !developerAuthorName || !developerAuthorEmail) {
    println("${project.name} 缺少项目描述信息")
}

android {
    publishing {
        singleVariant("release") {
            withSourcesJar()
            withJavadocJar()
        }
    }
}

afterEvaluate {
    publishing {
        publications {
            aar(MavenPublication) {
                from components.release

                groupId = projectGroupId
                artifactId = projectArtifactId
                version = projectVersionName

                pom {
                    name = projectArtifactId
                    description = projectDescription
                    // If your project has a dedicated site, use its URL here
                    url = projectGitUrl
                    if (projectLicense) {
                        licenses {
                            license {
                                name = projectLicense
                                url = projectLicenseUrl
                            }
                        }
                    }
                    developers {
                        developer {
                            id = developerAuthorId
                            name = developerAuthorName
                            email = developerAuthorEmail
                        }
                    }
                    // Version control info, if you're using GitHub, follow the format as seen here
                    scm {
                        connection = "scm:git:${projectGitUrl}"
                        developerConnection = "scm:git:${projectGitUrl}"
                        url = projectGitUrl
                    }
                    withXml { xmlProvider ->
                        def node = xmlProvider.asNode()
                        def getAt = node.getAt('dependencies')
                        def dependenciesNode
                        if (getAt == null) {
                            dependenciesNode = node.appendNode('dependencies')
                        } else {
                            dependenciesNode = getAt[0]
                        }
                        configurations.api.allDependencies.each { dependency ->
                            if (!dependency.hasProperty('dependencyProject')) {
                                def dependencyNode = dependenciesNode.appendNode('dependency')
                                dependencyNode.appendNode('groupId', dependency.group)
                                dependencyNode.appendNode('artifactId', dependency.name)
                                dependencyNode.appendNode('version', dependency.version)
                            }
                        }
                    }
                }
            }
        }

        repositories {
            maven {
                name = projectArtifactId

                def releasesRepoUrl = "https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/"
                def snapshotsRepoUrl = "https://s01.oss.sonatype.org/content/repositories/snapshots/"
                // You only need this if you want to publish snapshots, otherwise just set the URL
                // to the release repo directly
                url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl

                // The username and password we've fetched earlier
                credentials {
                    username mavenUsername
                    password mavenPassword
                }
            }
        }
    }
}

signing {
    sign publishing.publications
}

在要发布的Library工程下的build.gradle最后引用发布模板

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apply from: '../publish.gradle'

在工程根目录的build.gradle最后添加项目信息

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ext {
    // 版本号
    versionCode = 3
    // 版本名称
    versionName = "1.0.2"
    // groupId
    groupId = 'io.xiandan'
    // 项目描述
    description = 'JSONObject、JSONArray、Gson的Koltin扩展'
    // 项目git地址
    gitUrl = 'https://github.com/xiandanin/json-ktx'
    // 作者邮箱
    authorEmail = 'denghahae@gmail.com'
    // 开源协议
    license = 'MIT'
}

创建密钥

创建证书

生成密钥对

创建个人OpenPGP密钥对

勾选Protect the generated key with a passphrase.，输入密码

复制指纹后8位作为signing.keyId

生成撤销证书

右键证书，在服务器上发布，最后会发布在http://keys.gnupg.net

右键Backup Secret Keys...导出私钥证书，后缀名改为gpg

填写认证信息

将Sonatype账号和密钥信息填写到local.properties，signing.secretKeyRingFile就是最后导出的.gpg路径

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sonatype.username=
sonatype.password=

signing.keyId=
signing.password=
signing.secretKeyRingFile=

发布

执行publish任务，或者命令行执行gradlew publish

任务执行完成后，登录https://s01.oss.sonatype.org/#stagingRepositories，选中刚刚上传的提交，点击Close

无报错提示Repository Closed说明执行完成，点击Release，等待几十分钟就会同步到Maven Central了

首次发布同步

因为这个Group Id是首次发布，发布项目后，要手动通知同步到Maven Central，将Already Synced to Central标记为Yes，等待几个小时就可以在Maven Central看到项目了