jsp装饰器

// 定义一个组件接口
public interface Component {
    void operation();
}

// 实现组件接口的具体类
public class ConcreteComponent implements Component {
    @Override
    public void operation() {
        System.out.println("ConcreteComponent operation.");
    }
}

// 定义一个装饰器抽象类
public abstract class Decorator implements Component {
    protected Component component;

    public Decorator(Component component) {
        this.component = component;
    }

    @Override
    public void operation() {
        component.operation();
    }
}

// 具体的装饰器类，用于添加日志功能
public class LoggingDecorator extends Decorator {
    public LoggingDecorator(Component component) {
        super(component);
    }

    @Override
    public void operation() {
        System.out.println("Before operation.");
        super.operation();
        System.out.println("After operation.");
    }
}

// 测试装饰器模式
public class TestDecorator {
    public static void main(String[] args) {
        Component component = new ConcreteComponent();
        Component loggingComponent = new LoggingDecorator(component);
        loggingComponent.operation();
    }
}