找了很久，没有找到满意的。终于找到一个好的办法。
gradle7.x适用。比以前的写法简洁。
jar_2">发布传统的jar工程
比如okhttp，fastjson等项目，纯java工程。
- 直接创建新文件publish.gradle:
apply plugin: 'maven-publish'Properties properties = new Properties()
try {InputStream inputStream = file('../local.properties').newDataInputStream()properties.load(inputStream)
} catch (Throwable ignored) {ignored.printStackTrace()
}def moduleGroupId = findProperty('group.id')
def mavenName = findProperty('maven.name')
def mavenUploadUrl = findProperty('maven.upload.url')
def mavenUploadUsername = properties.getProperty('username')
def mavenUploadPassword = properties.getProperty('password')
def moduleArtifactId = "okhttp"
def moduleVersion = "4.12.0" //记得每次修改publishing {publications {create(moduleArtifactId, MavenPublication) {from components.javagroupId "${moduleGroupId}" //看备注artifactId "${moduleArtifactId}"version "${moduleVersion}"}}repositories {maven {name = mavenNameurl = mavenUploadUrlcredentials {username = mavenUploadUsernamepassword = mavenUploadPassword}}}
}
然后在jar生成工程的build.gradle里面添加：
//补充打包条件
java {withJavadocJar()withSourcesJar()
}apply from: "publish.gradle" //引入即可
gradle sync以后，能够得到如下：
点击运行发布。
备注：
其中，groupId "${moduleGroupId}" 是为了公司统一group包名。一些自行新建的仓库如此即可。
但，如果你是想修改某个外部库的源码，传到了公司内部，然后引入使用。最好的办法是注释掉groupId，修改源码，升级版本号即可。这样它会从多个仓库url去取，自然会从你们公司地址取到版本。
注释掉才能保证引入的时候：implement 'com.squareup.okhttp3:okhttp:4.12.0'
这样才不会导致多包问题。
发布aar
android 的aar发布差不多：
脚本文件publish.gradle:
apply plugin: 'maven-publish'//读取账号和签名信息文件
Properties properties = new Properties()
try {InputStream inputStream = file('../local.properties').newDataInputStream()properties.load(inputStream)
} catch (Throwable ignored) {ignored.printStackTrace()
}
def moduleGroupId = findProperty('group.id')
def mavenName = findProperty('maven.name')
def mavenUploadUrl = findProperty('maven.upload.url')
def mavenUploadUsername = properties.getProperty('username')
def mavenUploadPassword = properties.getProperty('password')
def moduleArtifactId = nameandroid {publishing {singleVariant("release") {withSourcesJar()withJavadocJar()}}
}afterEvaluate {publishing {publications {release(MavenPublication) {from components.releasegroupId = moduleGroupIdartifactId = moduleArtifactIdversion = moduleVersion}}repositories {maven {name = mavenNameurl = mavenUploadUrlcredentials {username = mavenUploadUsernamepassword = mavenUploadPassword}}}}
}
引入则：
apply from: “…/gradle/publish.gradle”
