用Calendar类_获取一个时间编号如：20110916142235

//用Calendar类_获取一个时间编号如：20110916142235  

public class Demo1{  
  public static void main(String[] args) throws Exception {
//        方法一
      System.out.println(getDateSerial());
     
      System.out.println("------------------");
//     方法二
      System.out.println(strs());
     }
   
     public static String getDateSerial(){
         String receiptId = "";
         Calendar cal = Calendar.getInstance();
         receiptId += cal.get(Calendar.YEAR);
       
         int month = (cal.get(Calendar.MONTH)+1);
         if(month < 10){
             receiptId += "0"+month;
         }else{
             receiptId += month;
         }
       
         int day = cal.get(Calendar.DATE);
         if(day < 10){
             receiptId += "0"+day;
         }else{
             receiptId += day;
         }
       
         int hour = cal.get(Calendar.HOUR_OF_DAY);
         if(hour < 10){
             receiptId += "0"+hour;
         }else{
             receiptId += hour;
         }
       
         int minute = cal.get(Calendar.MINUTE);
         if(minute < 10){
             receiptId += "0"+minute;
         }else{
             receiptId += minute;
         }
       
         int second = cal.get(Calendar.SECOND);
         if(second < 10){
             receiptId += "0"+second;
         }else{
             receiptId += second;
         }
         return receiptId;
     }
    
//      得到一个时间字符串
    public static  String strs(){
       Calendar rightNow = Calendar.getInstance();//getInstance返回一个Calendar对象，并由当前时间初始化
       SimpleDateFormat format = new SimpleDateFormat("yyyyMMddhhmmss");    //日期格式化格式
       String changeYear = format.format(rightNow.getTime()); //取得当前时间，并格式化成相应格式  
       return changeYear;
    }
 }