用maven打包java项目并发布jar包到maven仓库nexus上比较常见，这里就介绍用gradle来发布。

首先在build.gradle的plugins上加“ id ‘maven-publish’”就可以在右边Gradle菜单栏该项目下面的Tasks看到“publishing”了，如果没有就点build.gradle文件内右上角的小象图标“Load Gradle Changes”，接着配置publishing。

plugins {
    id 'java'
    id 'maven-publish'//用于发布jar包到maven仓库nexus
}

publishing {
    publications {
        maven(MavenPublication) {
            from components.java
        }
    }
    repositories {
        maven {
//            allowInsecureProtocol = true //Failed to publish publication ‘maven‘ to repository ‘maven3‘ ＞ Using insecure protocols with repo
            url "nexus仓库地址"
            credentials {
                username 'nexus账号'
                password 'nexus密码'
            }
        }
    }
}

然后右边Gradle菜单栏该项目下面的“publish”或“publishAllPublicationsToMavenRepository”即可将项目打包成jar包并发布到nexus上。

细心的话你会发现没有打包源码jar包，这个时候只需要在build.gradle配置文件中加上withSourcesJar()然后重新点“publishAllPublicationsToMavenRepository”发布即可。

java {
//    withJavadocJar()
    withSourcesJar()
}

你还可以在“maven(MavenPublication)”中加上“pom”来添加项目名称、描述、url、许可（licenses）、开发者信息（developers）、scm等等，更多配置参考Gradle官网的Publishing Libraries文档。

plugins {
    id 'org.springframework.boot' version '2.7.10'//'2.3.5.RELEASE' 2.6.6
    id 'io.spring.dependency-management' version '1.0.15.RELEASE'//'1.0.10.RELEASE' 1.0.11.RELEASE
    id 'java'
    id 'maven-publish'//用于发布jar包到maven仓库nexus
}

group = 'cn.xubingtao.dev'
version = '0.0.1-SNAPSHOT'//ALPHA
sourceCompatibility = '1.8'

//task sourceJar(type: Jar) {
//    from sourceSets.main.allSource,sourceSets.main.allJava
//    archiveClassifier = "sources"
//}

java {
//    withJavadocJar()
    withSourcesJar()
}

publishing {
    publications {
        maven(MavenPublication) {
//            groupId = 'cn.xubingtao.dev'
//            artifactId = 'dev'
//            version = '0.0.1-SNAPSHOT'
//            artifact sourceJar
////            artifact "dev-0.0.1-SNAPSHOT.jar"
            from components.java
            pom {
                name = "dev"
                description = "This is the project of dev."
                url = "https://www.xubingtao.cn/"
                licenses {
                    license {
                        name = "The Apache License, Version 2.0"
                        url = "http://www.apache.org/licenses/LICENSE-2.0.txt"
                    }
                }
                developers {
                    developer {
                        id = "xbt"
                        name = "xubingtao"
                        email = "kefu@xubingtao.cn"
                    }
                }
//                scm {
//                    connection = "scm:svn:https://svn.xubingtao.cn/svn/project/trunk/"
//                    developerConnection = "scm:svn:https://svn.xubingtao.cn/svn/project/trunk/"
//                    url = "https://svn.xubingtao.cn/svn/project/trunk/"
//                }
            }
        }
    }
    repositories {
        maven {
//            allowInsecureProtocol = true //Failed to publish publication ‘maven‘ to repository ‘maven3‘ ＞ Using insecure protocols with repo
            url "nexus仓库地址"
             credentials {
                username 'nexus账号'
                password 'nexus密码'
            }
            }
        }
    }
}
...

其中，“withJavadocJar()”可以打包文档但是要先处理好各种规范不然会报错；maven(MavenPublication)下的groupId、artifactId、version直接跟nexus上面的maven-snapshots等components的目录或路径对应，不配就用项目默认的；“sourceJar”的作用等同于“withSourcesJar()”。

另外用“sourceJar”以及build.gradle中加上“sourceSets.main.resources.srcDirs = [“src/main/java”,”src/main/resources”]”会导致报下面的策略问题duplicatesStrategy，所以还是直接使用“withSourcesJar()”比较好。

Execution failed for task ':sourceJar'.
> Entry xxx/xxx.java is a duplicate but no duplicate handling strategy has been set. Please refer to https://docs.gradle.org/8.1.1/dsl/org.gradle.api.tasks.Copy.html#org.gradle.api.tasks.Copy:duplicatesStrategy for details.

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