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为什么我的httpServletRequest返回null？为什么我的httpServletRequest返回NULL？
<form action="updateUserData" method="post" accept-charset="utf-8">
<input type="hidden" name="email" value="<%=user_email%>">
<table>
<tr>
<td><label for="usermail">Email</label></td>
<td><%=user_email%></td>
</tr>
<tr>
<td><label for="password">Password</label></td>
<td><input type="password" name="password" required> <br></td>
</tr>
<tr>
<td><label for="user_name">Name</label></td>
<td><input type="text" name="user_name" value="<%=user_name%>" required> <br></td>
</tr>
<tr>
<td><label for="user_name">Total Wins</label></td>
<td><input type="text" name="total_wins" value=<%=total_wins%> required> <br></td>
</tr>
</table>
<input type="submit" value="Update">
</form>
这里是我的servlet：
的Servlet：
resp.getWriter().println(" email from jsp : " + req.getAttribute("email"));
resp.getWriter().println(" password from jsp : " + req.getAttribute("password"));
resp.getWriter().println(" user's name from jsp : " + req.getAttribute("user_name"));
resp.getWriter().println(" total score from jsp : " + req.getAttribute("total_wins"));
当我打透过所有出放说空。我无法弄清楚为什么。任何人？
非常感谢!!!!! – user2747139
@ user2747139接受答案，如果它帮助你。 –
+1 @ user2747139如果有帮助，请接受答案。看看[接受]（http://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work/5235#5235）是如何工作的。 –