Oracle约会到Java日期

Question

What SimpleDateFormat to use for parsing Oracle date ?

I'm using this SimpleDateFormat.

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/mm/dd hh:mm:ss.sss");

its giving this exception.

java.text.ParseException: Unparseable date: "2011-08-19 06:11:03.0"

Kindly please tell me the SimpleDateFormat to use. Thanks.

Answer 1

You should use this Pattern "yyyy-MM-dd HH:mm:ss.S" instead of "yyyy/mm/dd hh:mm:ss.sss" .

little h for "Hour in am/pm (1-12)" and H for "Hour in day (0-23)"
see here: SimpleDateFormat

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
Date date = dateFormat.parse("2011-08-19 06:11:03.0");

Answer 2

tl;dr

LocalDateTime.parse( 
    "2011-08-19 06:11:03.0".replace( " " , "T" ) 
) 

Details

Your input string does not match your formatting pattern. Your pattern has slash characters where your data has hyphens.

java.time

Furthermore, you are using terrible old date-time classes that are now legacy, supplanted by the java.time classes.

Your input string nearly complies with the ISO 8601 standard for date-time formats. Replace the SPACE in the middle with a T .

String input = "2011-08-19 06:11:03.0".replace( " " , "T" ) ;

Your input lacks any indicator of time zone or offset-from-UTC. So we parse as a LocalDateTime , for an object lacking any concept of zone/offset.

LocalDateTime ldt = LocalDateTime.parse( input ) ;

To generate a string in standard format, call toString .

String output = ldt.toString() ;

If this input was intended for a specific time zone, assign it.

ZoneId z = ZoneId.of( "Africa/Tunis" ) ;
ZonedDateTime zdt = ldt.atZone( z ) ;

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About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date , Calendar , & SimpleDateFormat .

The Joda-Time project, now in maintenance mode , advises migration to the java.time classes.

To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations. Specification is JSR 310 .

With a JDBC driver complying with JDBC 4.2 or later, you may exchange java.time objects directly with your database. No need for strings or java.sql.* classes.

Where to obtain the java.time classes?

• Java SE 8 , Java SE 9 , and later
  • Built-in.
  • Part of the standard Java API with a bundled implementation.
  • Java 9 adds some minor features and fixes.
• Java SE 6 and Java SE 7
  • Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport .
• Android
  • Later versions of Android bundle implementations of the java.time classes.
  • For earlier Android, the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP… .

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval , YearWeek , YearQuarter , and more .