login.jsp

这也是一个java版的留言版

<%@ page contentType="text/html; charset=gb2312" %>
<%@ include file="../include/config.jsp" %>
<%@ include file="../include/global.jsp" %>
<%@ include file="../include/dbUtil.jsp" %>
<%@ include file="../include/dbConnect.jsp" %>
<%!
    int ni=-1;
%>
<%
boolean isDebug=isDebug(request,false);
if(isDebug){
    out.println("Now it's in DEBUG mode, and the time is "+getDateAndTime(null)+" !<br>");
    Enumeration enm=session.getAttributeNames();
    Object linStr=null;
    while(enm.hasMoreElements()){
        linStr=enm.nextElement();
        out.println(linStr+" = ");
        out.println(session.getAttribute(linStr.toString())+"<br>");
    }
}
DBConnect dbCon=new DBConnect(dbString,dbClass,dbUser,dbPswd);
try{
    String pageHint=null;
    String action=request.getMethod();
    String toURL=request.getParameter("toURL");
    String userID = request.getParameter("userID");
    String userPswd=request.getParameter("userPswd");


    if(session.getAttribute("hashtable")!=null&&isDebug){
        Hashtable ht=(Hashtable)session.getAttribute("hashtable");
                out.println("theID=*"+ht.get("theID")+"*<br>");
    }
    if(action.equalsIgnoreCase("POST")&&userID!=null&&userPswd!=null){
        String strSQL="select usr_pswd,usr_nick,usr_name,usr_class,usr_email from web_users where usr_nick='"+userID.toLowerCase()+"'";
        if(isDebug)out.println(strSQL);
        String[] userInfo=getValues(dbCon,strSQL);

        if(userInfo!=null&&userInfo[0].equals(userPswd)){
            session.removeAttribute("loadCounter");
            MySession mySession=new MySession(userInfo[1],userInfo[2],userInfo[3],userInfo[4]);
            session.setAttribute("mySession",mySession);
            if(toURL!=null)response.sendRedirect(toURL);
            else           alertPage(response,8000,null);
        }
        else{
            Object obj=session.getAttribute("loadCounter");
            int counter=0;
            if(obj!=null){
                counter=Integer.parseInt((String)obj);
            }

            counter++;
            if(counter<5){
                session.setAttribute("loadCounter",String.valueOf(counter));
                pageHint="对不起，你的用户名或者密码有误！你还有 "+(5-counter)+" 次机会尝试登陆。";
            }
            else{
                alertPage(response,7000,null);
                session.removeAttribute("hashtable");
            }
        }
    }
    else{
        String doing=request.getParameter("doing");
        if(doing!=null&&doing.equalsIgnoreCase("logout")){
            session.removeAttribute("mySession");
            alertPage(response,8000,null);
        }
        //out.println("doing="+doing);
        pageHint="请登陆Ofcool.com！";
        session.setAttribute("loadCounter","0");
    }
%>
<script language="JavaScript">
    function MM_reloadPage(init)
    {  //reloads the window if Nav4 resized
      if (init==true) with (navigator)
        {if ((appName=="Netscape")&&(parseInt(appVersion)==4))
        {
          document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage;
        }
        }
      else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
    }
    MM_reloadPage(true);

    function sub()
    {
       if (form1.userID.value == "")
       {
          alert("请选输入用户名！");
          form1.userID.focus();
          return false;
       }
       if (form1.userPswd.value == "")
       {
          alert("请选输入密码！");
          form1.userPswd.focus();
          return false;
       }
       form1.submit();
    }
</script>
<style type="text/css">
</style>
<%@ include file="../include/header.jsp" %>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td height="50" align=center><%=pageHint%></td>
  </tr>
  <tr>
    <td align="center">
      <!-- 登录表单 -->
      <form name="form1"  action="<%=request.getRequestURI()%>" method="post" onkeydown='javascript:if(window.event.keyCode==13){sub()}'>
      <input type=hidden name=toURL value="<%=toURL%>">
      <table width="60%" border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td><font color="#000000"><b>用户名：</b>
            <input type="text" name="userID" class="formedit" >
            </font></td>
          <td><font color="#000000"><b>密码：</b>
            <input type="password" name="userPswd" class="formedit" >
            </font></td>
          <td>
            <input type="button"  value="登录" class="formsub2" onclick='javascript:sub()'>
          </td>
        </tr>
      </table>
      </form>
      <!-- 登录表单 -->
    </td>
  </tr>
</table>
<script>form1.userID.focus();</script>
<%@ include file="../include/footer.jsp" %>
<%}catch(Exception e){alertPage(response,7775,e.toString());}finally{dbCon.close();}%>