登錄時需要用戶“記住用戶名”，如圖：


紅色部分需要注意的，
if("index".equals(action)){//顯示首頁登錄
? CookieUtil util=new CookieUtil(request,response,365*24*3600);
? Cookie cookie=util.getCookie("userId");
? if(cookie!=null){//需要判斷是否記錄了用戶名
?? request.getSession().setAttribute("userId", util.getCookieValue("userId"));
?? request.getSession().setAttribute("remember", "1");
? }
return mapping.findForward("index");
}
else
if ("login".equals(action)) {//點擊登錄時
System.out.println("----------------login--------------");
String userId = request.getParameter("userId");
String password = request.getParameter("password");

CookieUtil util=new CookieUtil(request,response,-1);
String authCode=util.getCookieValue("AUTHCODE");
System.out.println("authCode="+authCode);
if (!authCode.equals(form.getAuthCode())) {//驗證碼不正確
msg="驗證碼不正確！";
request.setAttribute("msg", msg);
return mapping.getInputForward();
}
User user = (User)this.getBaseService().get("from User where userId = '"+userId+"'");
if(user==null){
msg="用戶名不存在！";
request.setAttribute("msg", msg);
return mapping.getInputForward();
}
if(!user.getPassword().equals(StringUtil.hash(password))){
msg="密碼不正確！";
request.setAttribute("msg", msg);
return mapping.getInputForward();
}
//是否保存用戶名到cookie
String remember = request.getParameter("remember");

if(remember==null){//不勾選，則刪除之
? CookieUtil util2=new CookieUtil(request,response,0);
? util2.deleteCookie("userId");
}else{//勾選，則保存之
? CookieUtil util2=new CookieUtil(request,response,365*24*3600);
? util2.addCookie("userId", userId);//保存用戶名到cookies
}

........
)
需要CookieUtil類，見： http://gundumw100.iteye.com/admin/blogs/494328
//jsp文件如下：
<table width="100%" style="margin-top:30px">
? <tbody>
? <tr>
??? <td align="right">用戶名：</td>
??? <td align="left"> <input type="text" id="userId" name="userId" value="${sessionScope.userId }" /> </td>
? </tr>
? <tr>
??? <td align="right">密碼：</td>
??? <td align="left"><input type="password" id="password" name="password" value="" /></td>
? </tr>
? <tr>
??? <td align="right">驗證碼：</td>
??? <td align="left"><input type="text" style="width:90px" id="authCode" name="authCode"/><a href="#" onclick="javascript:refresh();"><img height="18" src="authimg" id="checkCodeImg" border="0"></a></td>
</tr>
???? <tr>
???? <td align="right"></td>
???? <td align="left">
???? <input type="checkbox" id="remember" name="remember" value="1" ${sessionScope.remember==1?'checked':'' }>記住用戶名

???? </td>
???? </tr>
<tr>
? <td colspan="2"><div align="center" style="color:red">${requestScope.msg }</div></td>
</tr>
<tr>
??? <td colspan="2" align="center">
??? <input id="imgButton" name="imgButton" type="image" src="images/login.gif" />
<a href="login.portal?action=register">注冊</a>
</td>
</tr>
</tbody>
</table>

登錄時“記住用戶名”