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2006年7月31日 #

Writely Blog is proud to announce that Writely access is now free for everyone. Just sign up for an account.

Writely is a word processing tool acquired by Google this year. Since it was acquired, users were required to have an invitation to try the product. You can read my negative review, but there are many people who like Writely.

posted @ 2006-08-18 09:53 BorderJ 閱讀(479) | 評論 (0) | 編輯收藏

request.getSession() 方法

HttpRequest對象有兩種形式的getSession方法調用：
一個是getSession()，
另一個是getSession(boolean isNew)

這樣的，前者會檢測當前時候有session存在，如果不存在則創建一個，如果存在就返回當前的。
getSession()相當于getSession(true)，

參數為true時，若存在會話則返回該會話，否則新建一個會話。
參數為false時，若存在會話則返回該會話，否則應該返回一個NULL

這是文檔：

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 ?

感謝 zhouhu的提醒，現在已經修正。
Edit By: BorderJ??? 2006.8.18

posted @ 2006-07-31 19:46 BorderJ 閱讀(7877) | 評論 (3) | 編輯收藏

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