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" style="display: inline">
                         
              <li>
                <input type="text" name="username" id="username" placeholder="用户名">
              </li>
              <li>
                <input type="text" name="pwd" id="pwd" placeholder="密码">
              </li>
			  <li>
                <select name="cx" id="cx" style="width:100px; height:22px; color:#888888;  background-color:#8cb88b; ">
                             <option value='注册用户'>注册用户</option>
<option value='管理员'>管理员</option>

                            </select>&nbsp;
              </li>
			  <li>
                <input type="text" name="pagerandom" id="pagerandom" placeholder="验证码" onKeyUp="this.value=this.value.replace(/\D/gi,'')">
              </li>
			   <li>
               <%
								String yzm=code.getCheckCode();
								%>  <input type="hidden" name="yzm" value="<%=yzm %>" >
							    <%=yzm %>&nbsp;
              </li>
              <li>
                <input type="submit" name="submit" id="submit" value="登陆" class="login" onClick="return checklog();">
              </li>
              <li>
                <input type="button" name="submit" id="submit" value="注册" class="sign" onclick="javascript:location.href='userreg.jsp';">
              </li>
			   </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;
	}
	
}
           
                                  </script>
								  
<%}else{ %>
				  <li>
                 用户名:<%=request.getSession().getAttribute("username")%>;&nbsp;
              </li>