java实现可插拔式jar调用

public interface Plugin {
    String getName();
    double execute(double a, double b);
}

public class AdditionPlugin implements Plugin {
    @Override
    public String getName() {
        return "Addition";
    }

    @Override
    public double execute(double a, double b) {
        return a + b;
    }
}

public class SubtractionPlugin implements Plugin {
    @Override
    public String getName() {
        return "Subtraction";
    }

    @Override
    public double execute(double a, double b) {
        return a - b;
    }
}

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;

public class Calculator {
    private List<Plugin> plugins = new ArrayList<>();

    public void loadPlugins(String jarPath) throws Exception {
        File file = new File(jarPath);
        URL url = file.toURI().toURL();
        try (URLClassLoader loader = new URLClassLoader(new URL[]{url})) {
            // 假设插件实现类都是在Package com.plugins下
            Class<?> clazz = loader.loadClass("com.plugins.AdditionPlugin");
            plugins.add((Plugin) clazz.getDeclaredConstructor().newInstance());
            
            clazz = loader.loadClass("com.plugins.SubtractionPlugin");
            plugins.add((Plugin) clazz.getDeclaredConstructor().newInstance());
        }
    }

    public void execute(String pluginName, double a, double b) {
        for (Plugin plugin : plugins) {
            if (plugin.getName().equals(pluginName)) {
                System.out.printf("Result of %s: %.2f%n", pluginName, plugin.execute(a, b));
                return;
            }
        }
        System.out.println("Plugin not found");
    }
}

public class Main {
    public static void main(String[] args) {
        Calculator calculator = new Calculator();
        try {
            calculator.loadPlugins("path/to/your/plugins.jar");
            calculator.execute("Addition", 5, 3);
            calculator.execute("Subtraction", 5, 3);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

pie
    title 插件调用情况
    "加法": 60
    "减法": 40