如何使用Gradle構建Maven項目作爲對根項目的依賴？

Question

我有一個具有多個子項目的根項目。最初，我們將項目作爲單獨的Maven項目保留下來，但我意識到Gradle更適合我使用。但對於其中一個子項目，我們寧願將其轉換爲Gradle項目，但將其保存爲Maven項目。

所以我試圖保留一個Maven項目作爲Gradle項目的一個子項目，但由於Maven項目pom.xml中列出的依賴項未包括在內，所以構建失敗。下面是我的實驗

文件夾/項目結構

root (gradle root project) 
|- api (maven project) 
|- project (gradle subproject, depends on the "api" project) 

根/ settings.gradle

rootProject.name = 'root' 

def subDirs = rootDir.listFiles(new FileFilter() { 
    public boolean accept(File file) { 
     if (!file.isDirectory()) { 
      return false 
     } 
     if (file.name == 'buildSrc') { 
      return false 
     } 
     return new File(file, 'build.gradle').isFile() 
    } 
}); 

subDirs.each { File dir -> 
    include dir.name 
} 

根/的build.gradle

import org.gradle.api.artifacts.* 

apply plugin: 'base' // To add "clean" task to the root project. 

subprojects { 
    apply from: rootProject.file('common.gradle') 
} 

task mergedJavadoc(type: Javadoc, description: 'Creates Javadoc from all the projects.') { 
    title = 'All modules' 
    destinationDir = new File(project.buildDir, 'merged-javadoc') 

    // Note: The closures below are executed lazily. 
    source { 
     subprojects*.sourceSets*.main*.allSource 
    } 
    classpath.from { 
     subprojects*.configurations*.compile*.copyRecursive({ !(it instanceof ProjectDependency); })*.resolve() 
    } 
} 

根/ common.gradle

// 
// This file is to be applied to every subproject. 
// 

apply plugin: 'java' 
apply plugin: 'maven' 

String mavenGroupId = 'com.mycompany.myproject' 
String mavenVersion = '1.0-SNAPSHOT' 

sourceCompatibility = '1.8' 
[compileJava, compileTestJava]*.options*.encoding = 'UTF-8' 

repositories { 
    mavenCentral(); 
    // You may define additional repositories, or even remove "mavenCentral()". 
    // Read more about repositories here: 
    // http://www.gradle.org/docs/current/userguide/dependency_management.html#sec:repositories 
} 

dependencies { 
    // Adding dependencies here will add the dependencies to each subproject. 
    testCompile group: 'junit', name: 'junit', version: '4.10' 
} 

String mavenArtifactId = name 

group = mavenGroupId 
version = mavenVersion 

task sourcesJar(type: Jar, dependsOn: classes, description: 'Creates a jar from the source files.') { 
    classifier = 'sources' 
    from sourceSets.main.allSource 
} 

artifacts { 
    archives jar 
    archives sourcesJar 
} 

configure(install.repositories.mavenInstaller) { 
    pom.project { 
     groupId = mavenGroupId 
     artifactId = mavenArtifactId 
     version = mavenVersion 
    } 
} 

task createFolders(description: 'Creates the source folders if they do not exist.') doLast { 
    sourceSets*.allSource*.srcDirs*.each { File srcDir -> 
     if (!srcDir.isDirectory()) { 
      println "Creating source folder: ${srcDir}" 
      srcDir.mkdirs() 
     } 
    } 
} 

根/ API/pom.xml的

<?xml version="1.0" encoding="UTF-8"?> 
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <groupId>com.mycompany.myproject</groupId> 
    <artifactId>api</artifactId> 
    <version>1.0-SNAPSHOT</version> 
    <packaging>jar</packaging> 
    <properties> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
     <maven.compiler.source>1.8</maven.compiler.source> 
     <maven.compiler.target>1.8</maven.compiler.target> 
    </properties> 

    <dependencies> 
     <!-- https://mvnrepository.com/artifact/de.dev-eth0.dummycreator/dummy-creator --> 
     <dependency> 
      <groupId>de.dev-eth0.dummycreator</groupId> 
      <artifactId>dummy-creator</artifactId> 
      <version>1.3</version> 
     </dependency> 
    </dependencies> 
</project> 

根/項目/的build.gradle

if (!hasProperty('mainClass')) { 
    ext.mainClass = 'com.mycompany.myproject.HelloWorld' 
} 

dependencies { 
    compile project(":api") 
} 

根/ API/src目錄/主/ JAVA/COM/myCompany的/ myproject的/ API /原料藥的.java

package com.mycompany.myproject.api; 

import org.dummycreator.DummyCreator; 

public class Api { 

    public static void sayHello() { 
     System.out.println("Hello from API!"); 

     DummyCreator dc = new DummyCreator(); 
     Integer integer = dc.create(Integer.class); 

     System.out.println("Integer: " + integer); 
    } 
} 

當建設 「項目」，我得到下面的輸出：

Executing: gradle build 
Arguments: [-c, C:\Users\birger\Desktop\test\root\settings.gradle] 

C:\Users\birger\Desktop\test\root\api\src\main\java\com\mycompany\myproject\api\Api.java:3: error: package org.dummycreator does not exist 
import org.dummycreator.DummyCreator; 
        ^
C:\Users\birger\Desktop\test\root\api\src\main\java\com\mycompany\myproject\api\Api.java:10: error: cannot find symbol 
     DummyCreator dc = new DummyCreator(); 
     ^
    symbol: class DummyCreator 
    location: class Api 
C:\Users\birger\Desktop\test\root\api\src\main\java\com\mycompany\myproject\api\Api.java:10: error: cannot find symbol 
     DummyCreator dc = new DummyCreator(); 
          ^
    symbol: class DummyCreator 
    location: class Api 
3 errors 
:api:compileJava FAILED 

FAILURE: Build failed with an exception. 

* What went wrong: 
Execution failed for task ':api:compileJava'. 
> Compilation failed; see the compiler error output for details. 

* Try: 
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. 

BUILD FAILED 

Total time: 0.106 secs 



Build failure (see the Notifications window for stacktrace): gradle build 

那麼，將Maven子項目「按常規構建」作爲Gradle根項目的子項目，而實際上不必將其轉換爲Gradle項目最簡單的方法是什麼？

Answer 1

如果您在Maven項目叫mvn install，然後你可以使用

repositories { 
    mavenLocal() 
} 

在gradle這個項目依賴於通過組/神器/版本的罐子。通過gradle的maven依賴集成，你可以從pom獲得所有的傳遞依賴關係