/**
* 任务
*
* @author leizhimin 2008-12-25 10:37:22
*/
public class MyTask extends Thread {
        private static boolean sw = false;

public void run() {
                while (sw) {
                        //进行的所有业务
                        for (int i = 0; i < 9999999; i++) ;
                        System.out.println("do------------");
                }
        }

public static void setOn() {
                if (sw == false) {
                        System.out.println("开关状态被置为开！,任务开始执行！");
                        sw = true;
                } else {
                        System.out.println("开关已经打开，无须设置！");
                }
        }

public static void setOff() {
                if (sw == true) {
                        System.out.println("开关关闭，正在执行的任务结束后将终止！");
                        sw = false;
                } else {
                        System.out.println("开关已经关闭，无须设置！");
                }
        }
}

/**
* 任务的执行工具
*
* @author leizhimin 2008-12-25 10:39:18
*/
public class Test {
        static int i = 0;

public synchronized static void exe() throws InterruptedException {
                System.out.println(++i);
                MyTask myTask = new MyTask();
                myTask.start();
                Thread.sleep(100);
        }

public static void main(String[] args) throws InterruptedException {
                exe();
        }
}

<a href="on.jsp">启动</a>         
<a href="off.jsp">关闭</a>
</body>
</html>