gradle mysql依赖同步，但does not工作

Question

所以我添加一个mysql依赖于我的build.gradle，它同步完美，但问题是，我不能使用依赖代码。例如， ，我添加了mysql.jar作为依赖项，并加载，但试图导入com.mysql.jdbc.driver不会工作。

通知，即时通讯使用libgdx库

我build.gradle：

buildscript { 
    repositories { 
     mavenLocal() 
     mavenCentral() 
     maven { url "https://oss.sonatype.org/content/repositories/snapshots/" } 
     jcenter() 
    } 

    dependencies { 
     classpath 'de.richsource.gradle.plugins:gwt-gradle-plugin:0.6' 
     classpath 'com.android.tools.build:gradle:1.5.0' 
     classpath 'com.mobidevelop.robovm:robovm-gradle-plugin:2.3.0' 
    } 
} 

allprojects { 
    apply plugin: "eclipse" 
    apply plugin: "idea" 

    version = '1.0' 
    ext { 
     appName = "Baladiya" 
     gdxVersion = '1.9.6' 
     roboVMVersion = '2.3.0' 
     box2DLightsVersion = '1.4' 
     ashleyVersion = '1.7.0' 
     aiVersion = '1.8.0' 
    } 

    repositories { 
     mavenLocal() 
     mavenCentral() 
     maven { url "https://oss.sonatype.org/content/repositories/snapshots/" } 
     maven { url "https://oss.sonatype.org/content/repositories/releases/" } 
    } 

} 

project(":desktop") { 
    apply plugin: "java" 

    dependencies { 
     compile project(":core") 
     compile "com.badlogicgames.gdx:gdx-backend-lwjgl:$gdxVersion" 
     compile "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-desktop" 
     compile "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-desktop" 
     compile "com.badlogicgames.gdx:gdx-tools:$gdxVersion" 
     compile files("libs/mysql.jar") 
    } 
} 

project(":android") { 
    apply plugin: "android" 

    configurations { natives } 

    dependencies { 
     compile project(":core") 
     compile "com.badlogicgames.gdx:gdx-backend-android:$gdxVersion" 
     natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-armeabi" 
     natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-armeabi-v7a" 
     natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-arm64-v8a" 
     natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86" 
     natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86_64" 
     compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion" 
     natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-armeabi" 
     natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-armeabi-v7a" 
     natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-arm64-v8a" 
     natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-x86" 
     natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-x86_64" 
     compile files("libs/mysql.jar") 
    } 
} 

project(":ios") { 
    apply plugin: "java" 
    apply plugin: "robovm" 


    dependencies { 
     compile project(":core") 
     compile "com.mobidevelop.robovm:robovm-rt:$roboVMVersion" 
     compile "com.mobidevelop.robovm:robovm-cocoatouch:$roboVMVersion" 
     compile "com.badlogicgames.gdx:gdx-backend-robovm:$gdxVersion" 
     compile "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-ios" 
     compile "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-ios" 
     compile files("libs/mysql.jar") 
    } 
} 

project(":html") { 
    apply plugin: "gwt" 
    apply plugin: "war" 

    dependencies { 
     compile project(":core") 
     compile "com.badlogicgames.gdx:gdx-backend-gwt:$gdxVersion" 
     compile "com.badlogicgames.gdx:gdx:$gdxVersion:sources" 
     compile "com.badlogicgames.gdx:gdx-backend-gwt:$gdxVersion:sources" 
     compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion:sources" 
     compile "com.badlogicgames.gdx:gdx-box2d-gwt:$gdxVersion:sources" 
     compile files("libs/mysql.jar") 
    } 
} 

project(":core") { 
    apply plugin: "java" 


    dependencies { 
     compile "com.badlogicgames.gdx:gdx:$gdxVersion" 
     compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion" 
     compile files("libs/mysql.jar")  
    } 
} 

tasks.eclipse.doLast { 
    delete ".project" 
} 

我的导入错误：

Answer 1

我不太肯定很多项目如何有libs/mysql.jar，但如果包括compile files("libs/mysql.jar")依赖关系在每个项目下，你需要这样的jar下对应的项目：

desktop/ 
|- src/ 
|- libs/mysql.jar 
android/ 
|- src/ 
|- libs/mysql.jar 
ios/ 
|- src/ 
|- libs/mysql.jar 
html/ 
|- src/ 
|- libs/mysql.jar 
core/ 
|- src/ 
|- libs/mysql.jar 

既然你已经需要依赖于coredesktop，android，ios，html项目， 所以compile files("libs/mysql.jar")的依赖实际上是多余的， 你只需要它被包含在core/。

让我知道这是否工作。

Answer 2

为什么你首先需要mysql.jar？通过你向我们展示来看，你只需要一个驱动程序 - 只需导入驾驶员jcenter或Maven中央例如：

compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.6'

到核心。