feat: support publish to mvn center

build.gradle

@@ -1,7 +1,11 @@
 plugins {
+    id 'java'
     id 'java-library'
+    id 'maven-publish'
+    id 'signing'
 }
-
+group 'org.bdware.bdcontract'
+version '0.1.0'
 sourceCompatibility = 1.8
 
 repositories {
@@ -13,13 +17,8 @@ task copyLibs(type: Copy) {
     into "./build/output/libs/"
 }
 
-//task copyJar(type: Exec, dependsOn: [":gmhelper:jar", ":gmhelper:copyLibs"]) {
-//    println("copyJar start")
-//    commandLine "cp", "./build/libs/$project.name-$version" + ".jar", "./build/output/gmhelper.jar"
-//}
-
 task copyJar(type: Copy, dependsOn: [":gmhelper:jar", ":gmhelper:copyLibs"]) {
-    from "./build/libs/$project.name-${project.version}.jar"
+    from "./build/libs/$project.name-${version}.jar"
     into "./build/output"
     rename { String fileName -> "gmhelper.jar" }
     doFirst {
@@ -31,6 +30,85 @@ dependencies {
     api 'com.google.code.gson:gson:2.8.8'
     api 'org.bouncycastle:bcpkix-jdk15on:1.69'
     api 'org.bouncycastle:bcprov-jdk15on:1.69'
-
     testImplementation 'junit:junit:4.13.2'
 }
+
+task classJar(type: Jar, dependsOn: classes) {
+    classifier = "jar"
+}
+task sourceJar(type: Jar, dependsOn: classes) {
+    archiveClassifier = "sources"
+    classifier = "sources"
+    from sourceSets.main.allSource
+}
+
+tasks.withType(Javadoc) {
+    options.addStringOption('Xdoclint:none', '-quiet')
+}
+
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    archiveClassifier = 'javadoc'
+    classifier = "javadoc"
+    exclude {
+        details -> details.file.getAbsolutePath().contains("/gm/")
+    }
+    from javadoc.destinationDir
+}
+
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            groupId project.group
+            artifactId "gmhelper"
+            version "${version}"
+            from components.java
+            artifact sourceJar
+            artifact javadocJar
+            artifact classJar
+            pom {
+                name = "bdware-gmhelper"
+                description = "gmhelper"
+                url = "https://gitee.com/BDWare/gmhelper"
+                licenses {
+                    license {
+                        name = "Mulan PSL v2"
+                        url = "http://license.coscl.org.cn/MulanPSL2"
+                    }
+                }
+                developers {
+                    developer {
+                        id = "dataware"
+                        email = "caihq@pku.edu.cn"
+                    }
+                }
+                scm {
+                    connection = "scm:git:https://gitee.com/BDWare/gmhelper.git"
+                    developerConnection = "scm:git:https://gitee.com/BDWare/gmhelper.git"
+                    url = "https://gitee.com/BDWare/gmhelper"
+                }
+            }
+
+        }
+    }
+    repositories {
+        maven {
+            name 'bdwareSnapshotRepository'
+            url 'https://oss.sonatype.org/content/repositories/snapshots'
+            credentials {
+                username = "${NEXUS_USERNAME}"
+                password = "${NEXUS_PASSWORD}"
+            }
+        }
+        maven {
+            name 'bdwareRepository'
+            url 'https://oss.sonatype.org/service/local/staging/deploy/maven2'
+            credentials {
+                username = "${NEXUS_USERNAME}"
+                password = "${NEXUS_PASSWORD}"
+            }
+        }
+    }
+}
+signing {
+    sign publishing.publications.mavenJava
+}