HttpSession 儲存驗證碼失敗

標籤：

try {    RandomValidateCode randomValidateCode = new RandomValidateCode();    String randomString = randomValidateCode.getRandcode(req, resp);//輸出圖片方法        // Cannot create a session after the response has been committed    HttpSession session = req.getSession();    session.setAttribute(RandomValidateCode.RANDOMCODEKEY, randomString);} catch (Exception e) {    logger.error(e.getMessage(), e);}

如上產生並且儲存驗證碼的代碼，在登入頁面 url 不輸工程名的時候（如 http://127.0.0.1:7878/），會報異常 Cannot create a session after the response has been committed

 

因此需要把 session.setAttribute(RandomValidateCode.RANDOMCODEKEY, randomString); 在 response 寫成驗證碼圖片前執行

HttpSession 儲存驗證碼失敗