How to use the VAADIN license checker to protect your Java class library
How to use the VAADIN license checker to protect your Java class library
Overview
Vaadin license checker is a tool to help protect your Java library from illegal use and infringement.It uses Vaadin's open source license check library, which can verify the legality of your class library and provide some functions to control and manage licenses.
How to integrate the VAADIN license checker
The following is the steps to protect your Java class library using the VAADIN license checker:
1. Add Maven dependence
First of all, you need to add a Maven dependencies of the VAADIN license checker to your project's pom.xml file.You can find the latest version in the central warehouse of Maven.
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-license-checker</artifactId>
<version>1.0.0</version>
</dependency>
2. Create a custom license check class
Next, you need to create a custom license check class that will expand the LicenseChecker class in the gallery in the gallery.You can implement some custom logic in this class to verify your license.
import com.vaadin.licensechecker.LicenseChecker;
public class CustomLicenseChecker extends LicenseChecker {
// Implement custom logic to verify the license
@Override
public boolean isLicenseValid(String licenseKey) {
// Add your license verification code here
Return true; // or return True or FALSE according to the verification results
}
}
3. Configure the VAADIN license checker
In your project, you need to configure the VAADIN license checker to use your custom license check class.
import com.vaadin.licensechecker.LicenseCheckerConfiguration;
import com.vaadin.licensechecker.LicenseCheckerServlet;
public class LicenseCheckerConfig {
public static void configureLicenseChecker() {
LicenseCheckerConfiguration config = new LicenseCheckerConfiguration();
config.setLicenseCheckerClass(CustomLicenseChecker.class);
LicenseCheckerServlet.register(config);
}
}
4. Add initialization code
Finally, you need to add some code to the Vaadin license checker during the initialization of your application.
import com.vaadin.licensechecker.LicenseCheckerConfiguration;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class MyApplicationInitializer implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
// Configure VAADIN license checker
LicenseCheckerConfig.configureLicenseChecker();
}
}
In this example, we use ServletContextListener to configure the VAADIN license checker when the application starts.
Use the VAADIN license checker
Once you have integrated and configured the VAADIN license checker, you can use the following methods to protect your Java library:
-Profit LicenseChecker.islicensevalid (String Licensekey) in your class library to verify the legitimacy of the license.This will return a Boolean value, indicating whether the license is valid.You can use this method in your code as needed.
String licenseKey = "your_license_key";
boolean isLicenseValid = LicenseChecker.isLicenseValid(licenseKey);
if (isLicenseValid) {
// The logic of executing a legal license
} else {
// The logic of executing illegal licenses
}
-Vaadin license checker also provides other methods to control and manage licenses, such as the detailed information of obtaining the license, the expiration date of the setting permit.You can use these methods as needed.
String licenseKey = "your_license_key";
String licenseDetails = LicenseChecker.getLicenseDetails(licenseKey);
Date licenseExpirationDate = LicenseChecker.getLicenseExpirationDate(licenseKey);
Summarize
By integrating the VAADIN license checker, you can better protect your Java library and control and manage the use of licenses.You can use a custom license check class to achieve the verification logic of the license and use the provided method to obtain the detailed information of the license.This will help you ensure that only users with effective licenses can access and use your library.
