如何将存储在字符串中的日期时间“ yyyy / MM / dd HH：mm：ss”转换为Date对象？

Question

I want to insert into a Mysql column (DATETIME column) a time & date . For that purpose i use the DATETIME field .

But on the JAVA side , I need to have a Date object with the time & date .

Consider the code :

    Calendar cal = Calendar.getInstance();
    DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    String str = dateFormat.format(cal.getTime());
    System.out.println(str);

This code produces :

2014/03/19 01:11:35

How can I convert it to a Date object in the format yyyy/MM/dd HH:mm:ss , so it would be possible to put it in the mysql column of DATETIME ?

Much appreciated

Answer 1

The getTime() method of Calendar returns a Date object.

For JDBC, you'll use a java.sql.Timestamp to preserve the time component. (I think a java.sql.Date loses the time component.)

For example:

 preparedStatement.setTimestamp(new java.sql.Timestamp(cal.getTime()));

Answer 2

First point: Date objects have no "format" - they just represent an instant in time.
If you print them, you get the default toString() implementation for Date .

Second point: You don't need to format a Date to use it with JDBC.
You should use a prepared statement, then call setObject() , to set the parameter value - the JDBC driver will do the rest, including wrapping in quotes if that's required for the data type.

Final point: Never use Calendar unless you have to.
In this case, simply new Date() will do the job.