如何在 java gradle 项目中包含对库的引用

Question

I am coming from a C# background. I am used to NuGet and Visual Studio project references so the Java ecosystem has confused me quite a bit.

I have a gradle library project. I want to import org.apache.commons.codec.binary.Base64;

However I keep getting cannot resolve errors. I am using VSCode as my IDE and I would like to include the codec dependancy. How would I achieve this in VSCode/gradle.

I have downloaded the commons-codec-1.14.jar file, but don't know where to put it in the project.

Answer 1

Gradle is a tool that, among other things, manages your dependencies. This means that, you do not need to manually download and add dependencies to your project. Gradle solves this for you.

See the official documenation on how to handle dependencies with Gradle.

You probably have a build.gradle file, in which you need to include your dependency. It would look something like:

dependencies {
  implementation 'commons-codec:commons-codec:1.14'
}

This lets Gradle know that you have a dependency to version 1.14 of commons-codec which your codes need to build and run.

This will automatically be downloaded from a remote repository, which you also can specify in your build.gradle file:

repositories {
  mavenCentral()
}

This tells gradle to download the dependencies from Maven Central, which probably is the most typical Maven/Gradle repository and most likely hosts most dependencies you would need.