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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(472) | 評(píng)論 (0) | 編輯收藏

request.getSession() 方法

HttpRequest對(duì)象有兩種形式的getSession方法調(diào)用：
一個(gè)是getSession()，
另一個(gè)是getSession(boolean isNew)

這樣的，前者會(huì)檢測當(dāng)前時(shí)候有session存在，如果不存在則創(chuàng)建一個(gè)，如果存在就返回當(dāng)前的。
getSession()相當(dāng)于getSession(true)，

參數(shù)為true時(shí)，若存在會(huì)話則返回該會(huì)話，否則新建一個(gè)會(huì)話。
參數(shù)為false時(shí)，若存在會(huì)話則返回該會(huì)話，否則應(yīng)該返回一個(gè)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(xiàn)在已經(jīng)修正。
Edit By: BorderJ??? 2006.8.18

posted @ 2006-07-31 19:46 BorderJ 閱讀(7863) | 評(píng)論 (3) | 編輯收藏

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