Java: String and Date, Timestamp switch between

 

  

Java: String and Date, Timestamp transfer between

 

 

  

   

a, String and Date (java.util.Date) Huzhuan

   

   

1.1 String -> Date

   

   

    

     

      Java code             

    

    

     
1. String dateStr = "2010/05/04 12:34:23" ;
     
2. Date date = < span class = "keyword" style = "color: # 7f0055; font-weight: bold;"> new Date ();
     
3. / / note format and date format to match the format String
     
4. DateFormat sdf = < span class = "keyword" style = "color: # 7f0055; font-weight: bold;"> new SimpleDateFormat ( "yyyy / MM / dd HH: mm: ss" );
     
5. try {
     
6. date = sdf.parse (dateStr);
     
7. System.out.println (date.toString ());
     
8. } catch (Exception e) {
     
9. e.printStackTrace ();
     
10. }
    

   

   

   

   

1.2 Date -> String

   

   

date to string conversion, you can set any format conversion format

   

    

     

      Java code             

    

    

     
1. String dateStr = "" ;
     
2. Date date = < span class = "keyword" style = "color: # 7f0055; font-weight: bold;"> new Date ();
     
3. / / format can be any format
     
4. DateFormat sdf = < span class = "keyword" style = "color: # 7f0055; font-weight: bold;"> new SimpleDateFormat ( "yyyy / MM / dd HH: mm: ss" );
     
5. DateFormat sdf2 = < span class = "keyword" style = "color: # 7f0055; font-weight: bold;"> new SimpleDateFormat ( "yyyy-MM-dd HH / mm / ss" );
     
6. try {
     
7. dateStr = sdf.format (date);
     
8. System.out.println (dateStr);
     
9. dateStr = sdf2.format (date);
     
10. System.out.println (dateStr);
     
11. } catch (Exception e) {
     
12. e.printStackTrace ();
     
13. }
    

   

   

two, String and Timestamp referrals

   

   

   

2.1 String -> Timestamp

   

   

   

use the Timestamp valueOf () method

   

    

     

      Java code             

    

    

     
1. Timestamp ts = new Timestamp (System.currentTimeMillis ());
     
2. String tsStr = < span class = "string" style = "color: blue;"> "2011-05-09 11:49:45" ; < / span>
     
3. try {
     
4. ts = Timestamp.valueOf (tsStr);
     
5. System.out.println (ts);
     
6. } catch (Exception e) {
     
7. e.printStackTrace ();
     
8. }
    

   

   

; Note: String type must be of the form: yyyy-mm-dd hh: mm: ss [. f. ..] such a format, brackets indicate optional, otherwise an error! ! !

   

If the String to other formats, you can consider re-parse the string under and then re ~ ~

   

   

2.2 Timestamp -> String

   

   

Timestamp use the toString () method or borrow DateFormat

   

   

    

     

      Java code             

    

    

     
1. Timestamp ts = new Timestamp (System.currentTimeMillis ());
     
2. String tsStr = < span class = "string" style = "color: blue;"> "" ;
     
3. DateFormat sdf = < span class = "keyword" style = "color: # 7f0055; font-weight: bold;"> new SimpleDateFormat ( "yyyy / MM / dd HH: mm: ss" );
     
4. try {
     
5. / / Method One
     
6. tsStr = sdf.format (ts);
     
7. System.out.println (tsStr);
     
8. / / method two
     
9. tsStr = ts.toString ();
     
10. System.out.println (tsStr);
     
11. } catch (Exception e) {
     
12. e.printStackTrace ();
     
13. }
    

   

   

was easily able to see it, the method has the advantage of a flexible set of strings can form.

   

three, Date ( java.util.Date ) and Timestamp referrals

   

   

statement: check API shows, Date and Timesta parent-child class relationships

   

   

   

3.1 Timestamp -> Date

   

   

   

    

     

      Java code             

    

    

     
1. Timestamp ts = new Timestamp (System.currentTimeMillis ());
     
2. Date date = < span class = "keyword" style = "color: # 7f0055; font-weight: bold;"> new Date ();
     
3. try {
     
4. date = ts;
     
5. System.out.println (date);
     
6. } catch (Exception e) {
     
7. e.printStackTrace ();
     
8. }
    

   

   

very simple, but at the moment the date object is an entity pointing Timestamp, that date has a Date class methods, but the method of execution was covered entities Timestamp medium.

   

   

   

3.2 Date -> Timestamp

   

   

parent class can not be converted directly to the sub-class, can make use of in the middle of String ~ ~ ~ ~

   

Note: Use the following method is more simple

   

Timestamp ts = new Timestamp (date.getTime ());