struts2执行原理简易代码

最新推荐文章于 2023-09-08 15:50:20 发布

转载最新推荐文章于 2023-09-08 15:50:20 发布 · 470 阅读

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本文介绍了一个简单的Java程序，演示了如何使用拦截器模式来增强Action类的功能。通过定义多个拦截器，可以在执行核心Action前后添加额外的行为。文章展示了具体的代码实现，包括如何创建拦截器、配置ActionInvocation以及执行流程。

public class Main {
   public static void main(String[] args) {
       new ActionInvocation().invoke();

   }
}

===========================

import java.util.ArrayList;
import java.util.List;

public class ActionInvocation {
   List<Interceptor> interceptors = new ArrayList<Interceptor>();
   int index = -1;
   Action action = new Action();

   public ActionInvocation(){
       this.interceptors.add(new FristInterceptor());
       this.interceptors.add(new SecondInterceptor());
   }

   public void invoke(){
       index++;
       if(index >= this.interceptors.size()){
           action.execute();
       }else{
           this.interceptors.get(index).interceptor(this);
           System.out.println(this.getClass().getSimpleName());
       }
   }
}

==================

public interface Interceptor {

public void interceptor(ActionInvocation invocation);
}

===============================================

public class FristInterceptor implements Interceptor {

   @Override
   public void interceptor(ActionInvocation invocation) {
       // TODO Auto-generated method stub
       System.out.println(1);
       invocation.invoke();
       System.out.println(-1);
   }

}

====================================================

public class SecondInterceptor implements Interceptor {

   @Override
   public void interceptor(ActionInvocation invocation) {
       // TODO Auto-generated method stub
       System.out.println(2);
       invocation.invoke();
       System.out.println(-2);
   }

}

======================================================

public class Action {

   public void execute(){
       System.out.println("execute !");
   }
}