String verifyCode = String.valueOf(new Random().nextInt(899999) + 100000);

// 注冊新用戶

  @Action(value = "reAimcodeGetVeCode")
  public void reAimcodeGetVeCode() {
    PrintWriter out;
    String result = "驗證碼申請失敗！請重試！";
    try {
      smsUnit = new SmsUnit(ConfUtil.getProperty("sys_sms_server"));
      if (null != account.getACCMOB() && !account.getACCMOB().equals("")) {
        account.setACCSTATUS(new BigDecimal(1));//設置使用狀態(tài)未用
        String verifyCode = String
            .valueOf(new Random().nextInt(899999) + 100000);//生成短信驗證碼
        account.setFSECURITYCODE(verifyCode);
        account.setACCCREATEDATE(new Date());
        
        // 設置驗證碼失效時間為1分鐘
        Calendar c = Calendar.getInstance();
        c.add(Calendar.  Minute in hour, 1); 
        // 執(zhí)行短信發(fā)送
        account.setFREGISTERSOURCE(fromSource);
          request.getSession().removeAttribute(ConstValues.WEB_SESSION_PROMOTE);
          AccountCriteria ac = new AccountCriteria();
          ac.createCriteria().andACCMOBEqualTo(account.getACCMOB());
          List<Account> acList = new ArrayList<Account>();
          acList = accountService.selectByExample(ac);
          if (acList != null && acList.size() > 0) {
            String content = "您的驗證碼為:" + verifyCode+"，該碼有效期為24小時，該碼只能使用一次！【短信簽名】";
            SendSmsReply sendSmsReply = smsUnit.sendSms(accName,accPwd ,account.getACCMOB(),content,"");
 
//調用第三方接口發(fā)送短信            result = sendSmsReply.getReplyMsg() + "&"
                + acList.get(0).getFID() + "&"
                + acList.get(0).getSDKURL();
          }
      }
    } catch (Exception e) {
      logger.error("獲取驗證碼失敗", e);
    } finally {
      try {
        response.setContentType("text/html;charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
        out = response.getWriter();
        out.write(result);
      } catch (IOException e) {
        logger.error("", e);
      }
    }
  }

//第三方短信發(fā)送接口代碼：
/**
         * 發(fā)送短信
         * @param accName 樂信賬號用戶名
         * @param accPwd 樂信賬號密碼
         * @param seed 當前時間 格式：YYYYMMDD HHMISS 例如：20130806102030
         * @param aimcodes 手機號多個手機號之間英文半角逗號隔開
         * @param content 內容后加簽名
         * @param schTime 定時時間格式如：2010-01-01 08:00:00
         * @return 服務端返回的結果 ok:業(yè)務id 或者 錯誤代碼
         */
        public static String sendSms(String accName,String accPwd,String mobies,String content,String schTime){
          StringBuffer sb = new StringBuffer("http://sdk.lx198.com/sdk/send2?");
          try {
            String seed=new SimpleDateFormat(dateFormatStr).format(new Date());
            sb.append("&accName="+accName); 
            sb.append("&seed="+seed);
            sb.append("&accPwd="+MD5.getMd5String(MD5.getMd5String(accPwd)+seed)); 
            sb.append("&aimcodes="+mobies);
            sb.append("&schTime="+URLEncoder.encode(schTime,"UTF-8")); //空格標點符號做encode轉換
            sb.append("&content="+URLEncoder.encode(content,"UTF-8")); //中文做encode轉換
            URL url = new URL(sb.toString());
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
            return in.readLine();
          } catch (Exception e) {
            e.printStackTrace();
          }
          return null;
        }

package com.day14string;
import java.util.Random;
public class Test2 {
 public String getCheckCode() {
 String ZiMu = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGJKLZXCVBNM1234567890";
 String result = "";
 Random random = new Random();
 for (int i = 0; i < 4; i++) {
  int index = random.nextInt(ZiMu.length());
  char c = ZiMu.charAt(index);
  result += c;
 }
 return result;
 }
 public static void main(String[] args) {
 // TODO Auto-generated method stub
 Test2 test2 = new Test2();
 System.out.println(test2.getCheckCode());
 }
}