String dateStr = "// ::";  
    Date date = new Date();  
   //注意format的格式要与日期String的格式相匹配  
   DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");  
   try {  
     date = sdf.parse(dateStr);  
      System.out.println(date.toString());  
    } catch (Exception e) {  
      e.printStackTrace();  
    } 
 String dateStr = "2010/05/04 12:34:23";
 Date date = new Date();
 //注意format的格式要与日期String的格式相匹配
 DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
 try {
  date = sdf.parse(dateStr);
  System.out.println(date.toString());
 } catch (Exception e) {
  e.printStackTrace();
 } 

String dateStr = "";  
   Date date = new Date();  
   //format的格式可以任意  
    DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");  
   DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH/mm/ss");  
    try {  
      dateStr = sdf.format(date);  
     System.out.println(dateStr);  
      dateStr = sdf.format(date);  
      System.out.println(dateStr);  
    } catch (Exception e) {  
      e.printStackTrace();  
    } 
 String dateStr = "";
 Date date = new Date();
 //format的格式可以任意
 DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
 DateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH/mm/ss");
 try {
  dateStr = sdf.format(date);
  System.out.println(dateStr);
  dateStr = sdf2.format(date);
  System.out.println(dateStr);
 } catch (Exception e) {
  e.printStackTrace();
 } 

Timestamp ts = new Timestamp(System.currentTimeMillis());  
    String tsStr = "-- ::";  
     try {  
       ts = Timestamp.valueOf(tsStr);  
       System.out.println(ts);  
    } catch (Exception e) {  
      e.printStackTrace();  
    } 
 Timestamp ts = new Timestamp(System.currentTimeMillis());
 String tsStr = "2011-05-09 11:49:45";
 try {
  ts = Timestamp.valueOf(tsStr);
  System.out.println(ts);
 } catch (Exception e) {
  e.printStackTrace();
 } 

Timestamp ts = new Timestamp(System.currentTimeMillis());  
    String tsStr = "";  
    DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");  
    try {  
      //方法一  
      tsStr = sdf.format(ts);  
     System.out.println(tsStr);  
     //方法二  
    tsStr = ts.toString();  
      System.out.println(tsStr);  
    } catch (Exception e) {  
     e.printStackTrace();  
   } 
 Timestamp ts = new Timestamp(System.currentTimeMillis());
 String tsStr = "";
 DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
 try {
  //方法一
  tsStr = sdf.format(ts);
  System.out.println(tsStr);
  //方法二
  tsStr = ts.toString();
  System.out.println(tsStr);
 } catch (Exception e) {
  e.printStackTrace();
 } 

Timestamp ts = new Timestamp(System.currentTimeMillis());  
   Date date = new Date();  
   try {  
     date = ts;  
      System.out.println(date);  
    } catch (Exception e) {  
     e.printStackTrace();  
    } 
 Timestamp ts = new Timestamp(System.currentTimeMillis());
 Date date = new Date();
 try {
  date = ts;
  System.out.println(date);
 } catch (Exception e) {
  e.printStackTrace();
 }

java.sql.Date 只存储日期数据不存储时间数据
// 会丢失时间数据
preparedStatement.setDate(1, new java.sql.Date(date.getTime()));
//可以这样来处理
preparedStatement.setTimestamp(1, new java.sql.Timestamp(new java.util.Date().getTime()));
 //想要得到完整的数据，包括日期和时间，可以这样
java.util.Date d = resultSet.getTimestamp(1);
//这样处理更合适一些，可以避免一些潜在Timestamp 问题
java.util.Date d = new java.util.Date(resultSet.getTimestamp(1).getTime());