How to use Apache Groovy in the Java library
The basic steps of using Apache Groovy in the Java class library are as follows:
Step 1: Install Apache Groovy
First, you need to install Apache Groovy in your development environment.You can download and install Groovy's latest version from the official website (https://groovy.apache.org/download.html).
Step 2: Create the Java class library project
Next, you need to create a Java -class library project in your IDE.You can use any IDE you like, such as Eclipse, Intellij IDEA, etc.
Step 3: Import the Groovy Library
In your Java library project, you need to guide the Groovy library into your project.The specific introduction method depends on the IDE you use.Generally speaking, you need to add the Groovy library to the construction path of the project.
Step 4: Create a Groovy class
In the Java class library project, a Groovy class is created.You can use Groovy to write business logic in the Java library.
For example, assuming that you want to implement a simple adder class, you can create a Groovy class adDer.groovy:
groovy
class Adder {
static int add(int a, int b) {
return a + b
}
}
Step 5: Call the Groovy class library
In your Java library project, you can use the Groovy class to perform business logic.First, you need to instance the Groovy class into an object, and then you can call the method.
For example, you can call the ADD method in Adder.groovy in a certain class in the Java library:
import groovy.lang.GroovyClassLoader;
import groovy.lang.GroovyObject;
class Main {
public static void main(String[] args) {
try {
GroovyClassLoader loader = new GroovyClassLoader();
Class<?> adderClass = loader.parseClass(new File("path/to/Adder.groovy"));
GroovyObject adder = (GroovyObject) adderClass.getDeclaredConstructor().newInstance();
int sum = (int) adder.invokeMethod("add", 2, 3);
System.out.println("Sum: " + sum);
} catch (Exception e) {
e.printStackTrace();
}
}
}
This will be printed:
Sum: 5
This is the basic step of using Apache Groovy in the Java class library.You can achieve more complex functions in the Groovy class library according to your needs.
