Jdk1.5 time bug solution under visita

Java extracts the time in the visita Environment 8 hours earlier than the correct system time, because our time zone is set to Beijing time (that is, GMT + 8)

 

Use the followingCodeA problem occurs when the time is used:

 

Calendar c = calendar. getinstance ();

Dateformat df = new simpledateformat ("HH: mm: SS ");

Return DF. Format (C. gettime ());

 

After the check, it is found that the default time zone set by Java is changed to id = "GMT", while the time zone in Beijing is GMT + 8, so the difference is exactly 8 hours.

 

There are three solutions::

1. code optimization

 

Calendar c = calendar. getinstance ();

Dateformat df = new simpledateformat ("HH: mm: SS ");

 

Timezone zone = new simpletimezone (28800000, "Asia/Shanghai ");

DF. settimezone (zone );

Return DF. Format (C. gettime ());

 

2. Upgrade JDK.

 

This bug exists in jdk1.5 with the bug ID 6440819

Http://bugs.sun.com/bugdatabase/view_bug.do? Bug_id = 6440819

 

This bug has been fixed in jdk1.6:

Http://java.sun.com/javase/6/webnotes/ReleaseNotes.html

 

3. manually set System Variables

 

Add User. timezone as follows:

Java.exe ......-duser. timezone = GMT + 08 ......

 

The third solution is recommended.

Of course, the worst way is to modify the system time or the time zone.