WebRoot/qtuserlog.jsp

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 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 <jsp:useBean id="code" scope="page" class="com.util.CheckCode" />
 <%
    if((String)request.getSession().getAttribute("username")==null || (String)request.getSession().getAttribute("username")==""){
     %>
                         <form action="hsgloginyanzheng.jsp" method="post" name="userlog" id="userlog" >
 <table width='100%' height='302' border='0' cellpadding='0' cellspacing='0' bgcolor='#FFFFFF' class='newsline'>
                              <tr>
                                <td height='48' colspan='4' style='padding-left:30px; font-size:20px;'><strong>用户登陆</strong></td>
                              </tr>
                              <tr>
                                <td width='40' height='28'>&nbsp;</td>
                                <td width='240' height='28'>用户名:</td>
                                <td height='28' colspan='2'><input name='username' type='text' id='username' placeholder='请输入用户名' style='width:160px; height:40px; border:solid 1px #000000; color:#666666;'  /></td>
                              </tr>
                              <tr>
                                <td height='28'>&nbsp;</td>
                             <td height='28'>密码:</td>
                                <td height='28' colspan='2'><input name='pwd' type='password' id='pwd' placeholder='请输入密码' style='width:160px; height:40px; border:solid 1px #000000; color:#666666' /></td>
                              </tr>
                              <tr >
                                <td height='28'>&nbsp;</td>
                                <td height='28'>权限:</td>
                                <td height='28' colspan='2'><select name='cx' id='cx' style='width:160px; height:40px; border:solid 1px #000000; color:#666666' >
                                  <option value='管理员'>管理员</option>
<option value='教师'>教师</option>
<option value='学生'>学生</option>

                                </select></td>
                              </tr>
                              <tr >
                                <td height='28'>&nbsp;</td>
                                <td height='28'>验证码:</td>
                                <td width='67' height='28'><input name="pagerandom" type="text" id="pagerandom" style=" height:20px; border:solid 1px #000000; color:#666666; width:50px" /></td>
                                <td width='653'><%
								String yzm=code.getCheckCode();
								%>  <input type="hidden" name="yzm" id="yzm" value="<%=yzm %>" >
								   <%=yzm %></td>
                              </tr>
                              <tr>
                                <td height='38' align='center'>&nbsp;</td>
                                <td height='38' align='center'>&nbsp;</td>
                                <td height='38' colspan='2'><input type='submit' name='Submit' value='登陆'  onclick='return checklog();' />
                                  <input type='reset' name='Submit2' value='重置'  /></td>
                              </tr>
                            </table>
							 </form>
							 <script type="text/javascript">
       
function checklog()
{
	if(document.userlog.username.value=="" || document.userlog.pwd.value=="" || document.userlog.pagerandom.value=="")
	{
		alert("请输入完整");
		return false;
	}
	if (document.userlog.pagerandom.value != document.userlog.yzm.value) {
			alert("验证码错误！");
			document.userlog.pagerandom.focus();
			return false;