实现定时任务【Timer+TimerTask】

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在实现定时任务的时候，必须面对多线程的问题，这里先贴两段代码，记录一下（还是实现短信验证码的功能，定时失效）

1）继承TimerTask类实现自己的定时任务

package com.util;import java.util.TimerTask;import javax.servlet.http.HttpSession;public class TimeUtil extends TimerTask {private HttpSession session;//设置sessionprivate String attr;public TimeUtil() {}public TimeUtil(HttpSession session,String attr) {super();this.session = session;this.attr = attr;}@Overridepublic void run() {/** * 将session中的msgCode清除 */session.removeAttribute(attr);//long time = scheduledExecutionTime();System.out.println("开始执行删除任务："+System.currentTimeMillis());}}

2）在action中实现发送短信的功能，并开启新的线程，在规定时间后删除session中保留的验证码，让验证失效

/** * 忘记密码，发送短信验证码，并将验证码放入session中，十分钟有效期 * @param mapping * @param form * @param req * @param res * @throws Exception */public void sendMsg( ActionMapping mapping,  ActionForm form,  HttpServletRequest req,  HttpServletResponse res) throws Exception {  // 将form 转型为User  User user = (User) form;// 2 应用业务逻辑Map<String, Object> map = new HashMap<String,Object>();PrintWriter writer= null;try{final String phone =user.getPhone(); //手机号//校验 验证码 发送次数Integer time = phoneMap.get(phone);System.out.println(maxTime+"       "+maxEfficTime);HttpSession session = req.getSession();//获取session对象String msgCode = RandomUtil.getMsgCode(4);//验证码String msg = RandomUtil.getMsg(msgCode, phone);//短信SendPhoneMsgUtil spmu = new  SendPhoneMsgUtil();        String sms = spmu.SendSms(phone,msg);//发送验证码,sms是状态码System.out.println("状态："+sms+"code："+msgCode);        //校验码保存到session中（使用timeTask在2分钟内将其删除）if(Integer.valueOf(sms)<=0){throw new RuntimeException("发送失败：失败代码："+sms);}if(time==null){//由于time是Integer类型，需要将null做一个转换，不能直接运算time=0;}phoneMap.put(phone, time++);Timer timer = new Timer();session.setAttribute("msgCode", msgCode);System.out.println("开始计时："+System.currentTimeMillis());timer.schedule(new TimeUtil(session, "msgCode"),maxEfficTime*60*1000);//2分钟后执行TimeUtil对象的run方法map.put("maxEfficTime",maxEfficTime*60);map.put("result", true);res.setContentType("application/json;charset=UTF-8");String jsonString = JSONObject.toJSONString(map);writer = res.getWriter();writer.print(jsonString);}catch(Exception e){e.printStackTrace();}finally{writer.close();}}

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