How to integrate the Scannotation framework in the Java class library
How to integrate the Scannotation framework in the Java class library
Scannotation is a lightweight framework for scanning the Java class that can help developers dynamically discover and load classes during runtime.It provides a simple and effective method to scan the class in the class path and extract information about these categories, such as annotations, class names, etc.This article will introduce how to integrate the Scannotation framework in the Java library to use the class scanning function in the class library.
The following is the step of integrating the Scannotation framework in the Java library:
Step 1: Import the scannotation library
First, you need to download the jar file of the Scannotation library and import it into the Java project.You can get JAR files from the official website of Scannotation or Maven Central Middle Storage.After adding dependencies, you can use all the functions of the Scannotation library in the project.
Step 2: Create a scanner
Next, you need to create a class scanner to scan the Java class.You can create a auxiliary class to handle the creation and use of the class scanner.The following is the code of an example scanner:
import io.github.scannotation.ClasspathUrlFinder;
import io.github.scannotation.Scannotation;
public class ClassScanner {
public void scanClasses(String packageToScan) {
try {
// Scan and get a class path
URL[] urls = ClasspathUrlFinder.findClassPaths();
// Create a scannotation object
Scannotation scanner = new Scannotation();
// Scan the class in the specified package
for (URL url : urls) {
scanner.scanArchives(url);
scanner.setClassLoader(Thread.currentThread().getContextClassLoader());
// Get the scanning result
for (String className : scanner.getAnnotationIndex().getClassIndex().keySet()) {
// Treat the logic of each class
handleClass(className);
}
}
} catch (Exception e) {
// Treatment abnormalities
}
}
private void handleClass(String className) {
// Customized class processing logic, such as output class name
System.out.println(className);
}
}
In the above examples, we use the Scannotation Library to create a class scanner.By calling the `Scanclasses` method and passing the package name to be scanned, you can scan all the classes in the package and customize it through the` handleclass` method.
Step 3: Use a class scanner in the class library
When using a scanner in your class library, make sure to add the Scannotation library to your class path and use the following example code to use the class scanner:
public class MyLibrary {
public void doSomething() {
ClassScanner classScanner = new ClassScanner();
classScanner.scanClasses("com.mylibrary");
}
}
In the above example, we created a class scanner instance in the `Dosomething` method, and scan all the class in the` com.mylibrary` package by calling the `Scanclasses` method.
Through the above steps, you can easily integrate the Scannotation framework in the Java class library and use the scanning function provided by it.In this way, you can dynamically discover and load the class at runtime, and perform the corresponding logic as needed.
