今天高兴，解决了一个问题，发布一个自己写的各种日期转换的类，希望帮助和我一样初学的朋友！！

Question

case 102:
                     try
                     {
                        SimpleDateFormat formatter = new SimpleDateFormat( "yyyy.MM.dd" );
                        strDate = formatter.format( date );
                        break;
                     }
                     catch( Exception e )
                     {
                        e.printStackTrace( );
                     }
                      case 133:
                     try
                     {
                        SimpleDateFormat formatter = new SimpleDateFormat( "yyyyMMddHHmmss" );
                        strDate = formatter.format( date );
                        break;
                     }
                     catch( Exception e )
                     {
                        e.printStackTrace( );
                     }
                     case 134:
                     try
                     {
                        SimpleDateFormat formatter = new SimpleDateFormat( "HHmmss" );
                        strDate = formatter.format( date );
                        break;
                     }
                     catch( Exception e )
                     {
                        e.printStackTrace( );
                     }
                     case 135:
                          int iYear = date.getYear( ) + 1900;
                          int iMonth = date.getMonth( ) + 1;
                          int iDay = date.getDate( );
                          strDate = String.valueOf( iYear) + "年";
                          strDate = strDate + String.valueOf( iMonth) + "月"; 
                          strDate =strDate + String.valueOf( iDay ) + "日";
                          break;
                default:
                     strDate = date.toLocaleString( );
           }
           return strDate;    
      }
     public Date getStringToDate( String strDate, int parameter )
      {
           Date myDate;
           switch( parameter )
           {
                case 101:
                     try
                     {
                           SimpleDateFormat formatter = new SimpleDateFormat( "MM/dd/yyyy" );
                           myDate = formatter.parse( strDate );
                           break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 102:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "yyyy.MM.dd" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 103:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "dd/MM/yyyy" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 104:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "dd.MM.yyyy" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 105:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "dd-MM-yyyy" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 110:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "MM-dd-yyyy" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 111:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "yyyy/MM/dd" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }  
                case 112:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "yyyyMMdd" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 120:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 132:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "yyyy-MM-dd" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                case 133:
                     try
                     {
                          SimpleDateFormat formatter = new SimpleDateFormat( "yyyyMMddHHmmss" );
                          myDate = formatter.parse( strDate );
                          break;
                     }
                     catch( Exception e )
                     {
                          e.printStackTrace( );
                     }
                default:
                     myDate = new Date( );
           }
           return myDate; 
      }
}写得不是很好，建议大家改成Calendar的类，因为现在一般都不推荐使用Date了，但对于初学的朋友，我想还是有必要了解的！！大家以后，多多指点！！

Answer 1

//用你的类还的看你的代码说明？
//如果我需要其他的格式，你再修改你的方法？
//不如提供一个方法
public String getFormatedTime(String format) {
SimpleDateFormat formatter = new SimpleDateFormat(format);
Calendar cal = Calendar.getInstance();
return formatter.format(cal.getTime());
}
//自己写format，只需要简单说明一下format的要求不就行了，干吗要用那么多的case一点建议

Answer 2

呵呵,至少总得提供一个
public final static int AMERICAN = 101;这一类的变量吧再,干嘛写那么多次的strDate = formatter.format( date )啊,
太.....了吧,
如果太频繁调用的话,
采用FlyWeight模式如何?
然后何不建立一个位置码到一个格式的映射,这么长的case,有点吓人啊,
写一个HashMap查询String比较好

Answer 3

TO:xch28(①日蚀) 
谢谢，你的建议不错哦，自己写FORMATTER，不用那么麻烦！！
我会改进！！

Answer 4

你的代码过于复杂了，实际不应该这样写
public String getDateToString( Date date, int parameter )
{
  String strDate = null;
  String pattern = "yyyymmdd";//Default
  switch( parameter )
  {
    case USA://一定要定义成final static int，清楚！
           pattern = "mm/dd/yyyy";
         break;
    case FRANCE:
           pattern = "dd/mm/yyyy";
           break;
    ....
  }
  SimpleDateFormat sdf = new SimpleDateFormat(pattern);
  ...
以上代码使得你的长度大量减少，清晰！
其实这个函数也不是必须的，因为代码本身就不太多

Answer 5

再加一个配置文件吧,
建立一种key到pattern的映射的关系,
在初始化时读这个配置,
这样子加入新的日期格式比较方便

Answer 6

大家建议以后，我还是决定放弃DATE，使用CALENDAR，改成如下这样：
 public String getDateToString( Calendar cal, String formatter)
      {
          String strDate = null;
          if( formatter.equals( "ymd" ) )
          {
               int iYear = cal.get( cal.YEAR );
               int iMonth = cal.get( cal.MONTH ) + 1;
               int iDay = cal.get( cal.DAY_OF_MONTH );
               strDate = String.valueOf( iYear ) + "年" + String.valueOf( iMonth ) + "月"+ String.valueOf( iDay ) + "日";
           }
           else if( formatter.equals( "yMdhms" ) )
           {
                int iYear = cal.get( cal.YEAR );
               int iMonth = cal.get( cal.MONTH ) + 1;
               int iDay = cal.get( cal.DAY_OF_MONTH );
               int iHour = cal.get( cal.HOUR_OF_DAY );
                int iMinute = cal.get( cal.MINUTE );
                int iSecond = cal.get( cal.SECOND );
                strDate = String.valueOf( iYear ) + "年" + String.valueOf( iMonth ) + "月"+ String.valueOf( iDay ) + "日" + String.valueOf( iHour ) + "点" + String.valueOf( iMinute ) + "分"+ String.valueOf( iSecond ) + "秒";
           }
           else if( formatter.equals( "week" ) )
           {
                 int iWeek = cal.get( cal.DAY_OF_WEEK );
                 switch( iWeek )
                 {
                      case 1:
                      strDate = "星期日";
                      break;
                      case 2:
                      strDate = "星期一";
                      break;
                      case 3:
                      strDate = "星期二";
                      break;
                      case 4:
                      strDate = "星期三";
                      break;
                      case 5:
                      strDate = "星期四";
                      break;
                      case 6:
                      strDate = "星期五";
                      break;
                      case 7:
                      strDate = "星期六";
                      break;
                 }
           }
          {     
               try
               {
                    SimpleDateFormat myFormatter = new SimpleDateFormat( formatter );
                    strDate = myFormatter.format( cal.getTime( ) );
               }
                catch( Exception e )
                {
                     e.printStackTrace( );     
                } 
           }   
           return strDate;    
      }

Answer 7

TO：ChDw(米) 
谢谢，但是，我觉得封装起来，还是好用些，只是觉得，至少对初学的朋友，我想还是有点用吧！！！：），大家多批，没事，我虚心听取建议！！