责任链模式简单实现

两种实现方式

第一种

public interface IBaseTask {public void doAction(String isTask,IBaseTask iBaseTask);
}

public class ChainManager implements IBaseTask{//工作类的集合private List<IBaseTask> iBaseTaskList = new ArrayList<>();public void addTask(IBaseTask iBaseTask){iBaseTaskList.add(iBaseTask);}//下标private int index = 0;@Overridepublic void doAction(String isTask, IBaseTask iBaseTask) {if(iBaseTaskList.isEmpty()){};if (index >= iBaseTaskList.size()){return;}//获取对应下标的任务对象IBaseTask baseTask = iBaseTaskList.get(index);index ++;//执行任务baseTask.doAction(isTask,iBaseTask);}
}

//创建三个责任链对象

public class TaskOne implements IBaseTask{@Overridepublic void doAction(String isTask, IBaseTask iBaseTask) {if ("1".equals(isTask)) {System.out.println("拦截器1处理了");}else{iBaseTask.doAction(isTask,iBaseTask);}}
}

public class TaskTwo implements IBaseTask{@Overridepublic void doAction(String isTask, IBaseTask iBaseTask) {if ("2".equals(isTask)) {System.out.println("拦截器2处理了");}else{iBaseTask.doAction(isTask,iBaseTask);}}
}

public class TaskThree implements IBaseTask{@Overridepublic void doAction(String isTask, IBaseTask iBaseTask) {if ("3".equals(isTask)) {System.out.println("拦截器3处理了");}else{iBaseTask.doAction(isTask,iBaseTask);}}
}

执行

private void zerenlian1() {ChainManager chainManager = new ChainManager();chainManager.addTask(new TaskOne());chainManager.addTask(new TaskTwo());chainManager.addTask(new TaskThree());//从TaskOne开始执行不对的话就自动执行TaskTwochainManager.doAction("2",chainManager);//返回结果 "拦截器2处理了"}

第二种

public abstract class BaseTask {private boolean isTask;public BaseTask(boolean isTask) {this.isTask = isTask;}private BaseTask nextTask;public void addTask(BaseTask nextTask){this.nextTask = nextTask;}public abstract void doAction();public void action(){if(isTask){doAction();}else{if(nextTask != null){nextTask.action();}}}
}

public class Task1 extends BaseTask{public Task1(boolean isTask) {super(isTask);}@Overridepublic void doAction() {System.out.println("节点1已被执行");}
}

    private void zerenlian() {Task1 task1 = new Task1(false);Task2 task2 = new Task2(false);Task3 task3 = new Task3(true);task1.addTask(task2);task2.addTask(task3);task1.action();}