request.getSession(true) and request.getSession(false)

捻秋成哥

于 2012-08-19 21:24:39 发布

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分类专栏：程序人生文章标签： session cookies null

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本文详细介绍了getSession方法的功能和使用方式。此方法用于获取当前请求关联的HttpSession，如果不存在且参数create为真，则创建一个新的会话。文章还强调了为了正确维护会话，在响应提交前调用此方法的重要性。

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getSession
public   HttpSession   getSession(boolean   create)Returns   the   current   HttpSession   associated   with   this   request   or,   if   if   there   is   no   current   session   and   create   is   true,   returns   a   new   session.
If   create   is   false   and   the   request   has   no   valid   HttpSession,   this   method   returns   null.

To   make   sure   the   session   is   properly   maintained,   you   must   call   this   method   before   the   response   is   committed.   If   the   container   is   using   cookies   to   maintain   session   integrity   and   is   asked   to   create   a   new   session   when   the   response   is   committed,   an   IllegalStateException   is   thrown.

Parameters:
true   -   to   create   a   new   session   for   this   request   if   necessary;   false   to   return   null   if   there 's   no   current   session
Returns:
the   HttpSession   associated   with   this   request   or   null   if   create   is   false   and   the   request   has   no   valid   session