在Gradle项目中使用Apache Commons IO

Question

I'm writing a Java program - a plain command line program, not Android or anything like that - using Gradle, and trying to include Apache Commons IO. Per https://mvnrepository.com/artifact/commons-io/commons-io/2.6 I ended up with build.gradle like this:

apply plugin: 'application'
apply plugin: 'java'

repositories {
    mavenCentral()
}

dependencies {
    // https://mvnrepository.com/artifact/commons-io/commons-io
    compile group: 'commons-io', name: 'commons-io', version: '2.6'
}

mainClassName = 'Main'

Gradle seems to download the package happily enough, but import statements referring to apache or commons get a not found error; this is true even when I run gradle build from the command line, omitting any IDE. What am I missing? (Previous similar discussions have been for Android or Eclipse projects; the instructions for those haven't worked here.)

Answer 1

I don't see any problems with your Gradle script, so at first glance, I'm thinking of two possible explanations:

• you import a class that cannot be found in the artifact (eg a previous version of commons-io deprecated it and now they removed it)
• your project's structure is set up incorrectly

I copied the exact contents of your script in a build.gradle file, created a src/main/java directory structure in the same directory, and wrote a small application Main.java under that directory with the following:

import org.apache.commons.io.IOCase;

public class Main {
    public static void main(String[] args) {
        System.out.println(IOCase.SENSITIVE.checkEndsWith("abcd1234", "1234"));
    }
}

The code compiles successfully, so I need more context to troubleshoot your problem.