string and date, timestamp

One, string and Date (java.util.Date) each other

1.1 String--Date

    String datestr = "2010/05/04 12:34:23";               New Date ();               // Note format is formatted to match              the format of the date string New SimpleDateFormat ("Yyyy/mm/dd HH:mm:ss");               Try {                  = sdf.parse (datestr);                  System.out.println (Date.tostring ());               Catch (Exception e) {                  e.printstacktrace ();              }   

1.2 Date, String

date to string conversion, you can set any of the conversion formats format

String datestr = ""; Date Date=NewDate (); //format can be used in anyDateFormat SDF =NewSimpleDateFormat ("Yyyy/mm/dd HH:mm:ss"); DateFormat SDF2=NewSimpleDateFormat ("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 (); }  

Two, string and timestamp mutual transfer

2.1 String->timestamp

Using the timestamp valueof () method

    New Timestamp (System.currenttimemillis ());               = "2011-05-09 11:49:45";               Try {                  = timestamp.valueof (tsstr);                  SYSTEM.OUT.PRINTLN (TS);               Catch (Exception e) {                  e.printstacktrace ();              }  

Note: The type of string must be a yyyy-mm-dd hh:mm:ss[.f...] 这样的格式，中括号表示可选，否则报错！！！ shape such as:

If the string is in another format, consider re-parsing the string, and then reorganizing ~ ~

2.2 Timestamp, String

Use the ToString () method of timestamp or borrow DateFormat

Timestamp ts =NewTimestamp (System.currenttimemillis ()); String Tsstr= ""; DateFormat SDF=NewSimpleDateFormat ("Yyyy/mm/dd HH:mm:ss"); Try {                  //Method OneTsstr =Sdf.format (TS);                  System.out.println (TSSTR); //Method TwoTsstr =ts.tostring ();              System.out.println (TSSTR); } Catch(Exception e) {e.printstacktrace (); }  

It is easy to see that the advantage of method one is that it can be flexibly set in the form of strings.

Third, Date ( java.util.Date ) and timestamp mutual transfer

Disclaimer: The API indicates that date and Timesta are parent-child relationships

3.1 Timestamp-Date

    New Timestamp (System.currenttimemillis ());               New Date ();               Try {                  = ts;                  SYSTEM.OUT.PRINTLN (date);               Catch (Exception e) {                  e.printstacktrace ();              }  

Very simple, but now the entity that the date object points to is a timestamp, that is, date has a method of the date class, but the execution entity of the overridden method is in timestamp.

3.2 Date, Timestamp

The parent class cannot be converted directly to the subclass, with the help of the intermediate string~~~~

Note: Use the following method to be more concise

Timestamp ts = new Timestamp (Date.gettime ());

string and date, timestamp