马士兵struts2视频教程第七十六集

来源：互联网发布：音乐变调软件编辑：程序博客网时间：2024/04/30 15:24

实现拦截器主要是在actionInvocation里面，interceptor在构造方法装载，然后在invoke方法里面循环加载，每个interceptor里面invoke下一个interceptor，直到action，然后倒着输出每个interceptor中invoke后面的方法。

package com.ceair.core.util;public interface Interceptor {public void interceptor(ActionInvocation invocation);}

package com.ceair.core.util;public class FirstInterceptor implements Interceptor {public void interceptor(ActionInvocation invocation) {System.out.println("1");invocation.invoke();System.out.println("-1");}}

package com.ceair.core.util;public class SecondInterceptor implements Interceptor {public void interceptor(ActionInvocation invocation) {System.out.println("2");invocation.invoke();System.out.println("-2");}}

package com.ceair.core.util;public class Action {public void execute() {System.out.println("Action");}}

package com.ceair.core.util;import java.util.ArrayList;import java.util.List;public class ActionInvocation {List<Interceptor> list = new ArrayList<Interceptor>();int index = -1;Action a = new Action();public ActionInvocation() {this.list.add(new FirstInterceptor());this.list.add(new SecondInterceptor());}public void invoke() {index ++;if (index >= this.list.size()) {a.execute();} else {this.list.get(index).interceptor(this);}}}

package com.ceair.core.util;public class Main {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubnew ActionInvocation().invoke();}}

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