我的jsp项目有问题。当我提交表单时,数据被插入到数据库中,并向用户显示自动生成的用户ID和密码。但是当我单击刷新按钮时,将使用新的用户标识和密码重新提交相同的数据。 表格和插入的代码如下。
stinsrt.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>STUDENT REGISTRATION</title>
<%@ include file="connect.jsp" %>
<script>
window.history.forward();
</script>
<script language="javascript">
</script>
</head>
<center><img border="0" src="Student Info Systems.jpg" alt="Pulpit rock" width="304" height="228" /></center>
<body>
<%@ page language="java" import="java.sql.* , java.io.*" %>
<%! String str1,str2,str3,str4,str5,str6,str7,str8,str10,sid,tsid,date,month,year,day;
int max;%>
<%
try
{
str1=request.getParameter("fname");
str2=request.getParameter("lname");
str3=request.getParameter("faname");
str5=request.getParameter("phno");
str6=request.getParameter("email");
str7=request.getParameter("gend");
month=request.getParameter("DateOfBirth_Month");
day=request.getParameter("DateOfBirth_Day");
year=request.getParameter("DateOfBirth_Year");
int str9=Integer.parseInt(request.getParameter("Department"));
str10=request.getParameter("add");
str8=day+"-"+month+"-"+year;
//out.println(str1+"-"+str2+"-"+str3+"-"+str5+"-"+str6+"-"+str7+"-"+str8+"-"+str9+"-"+str10);
if(str1.length()!=0&&str2.length()!=0&&str3.length()!=0
&&str6.length()!=0&&str7.length()!=0&&str8.length()!=0&&str10.length()!=0)
{
Statement st=con.createStatement();
ResultSet rs=st.executeQuery("select max(id) from student");
if(rs.next())
sid=rs.getString(1);
if(sid==null)
sid="S100";
tsid=sid.substring(1,sid.length());
max=Integer.parseInt(tsid);
max++;
sid="S"+max;
PreparedStatement pst=con.prepareStatement("INSERT INTO student values(?,?,?,?,?,?,?,?,?,?)");
pst.setString(1,sid);
pst.setString(2,str1);
pst.setString(3,str2);
pst.setString(4,str3);
pst.setString(5,str5);
pst.setString(6,str6);
pst.setString(7,str7);
pst.setString(8,str8);
pst.setInt(9,str9);
pst.setString(10,str10);
int k=pst.executeUpdate();
%>
<b><h2><center>Student Registration Successful...</center></h2></b>
<h2> Student Id is <% out.println(sid);%> </h2>
<h3> Default Password is
<%
String str="";
for(int i=0;i<=8;i++)
{
str=str+(char)((int)'A'+Math.random()*((int)'Z'-(int)'A'+1));
}
out.println(str);
PreparedStatement dst=con.prepareStatement("INSERT INTO LOGIN(USER_ID,PASSWORD,ROLE,COUNT) VALUES(?,?,?,?)");
dst.setString(1,sid);
dst.setString(2,str);
dst.setString(3,"STUDENT");
dst.setInt(4,0);
dst.executeUpdate();
%>
<br>
<a href="adminhome.html">Back</a>
<% pst.close();
con.close(); }
else
{
out.println("<b>Incomplete Student Information</b>");
}
}
catch(Exception e)
{
out.println("Error:"+e);
}%>
</body>
</html>
学生注册表
<html>
<head>
<title>Student Registration</title>
<script>
window.history.forward();
</script>
<script>
function validate()
{
formObj=document.f;
for(var i=0;i<formObj.length;i++)
{
if(formObj.elements[i].value==""||formObj.elements[i].value=="Invalid")
{
alert("All fields must be completed with valid inormation for submission");
formObj.elements[i].focus();
return false;
}
}
//Name
var fname=document.f.Firstname;
var nameexp=/[^a-zA-Z]$/;
res=nameexp.test(fname.value);
//alert(res);
if(res)
{
alert("Enter Alphabets only for First Name");
fname.select();
return false;
}
var lname=document.f.Lastname;
res=nameexp.test(lname.value);
//alert(res);
if(res)
{
alert("Enter Alphabets only for Last Name");
lname.select();
return false;
}
//Address
var Address=document.f.Address.value;
var addxp=/[^a-zA-Z0-9]$/;
// alert(addxp.test(address));
if(addxp.test(address))
{
alert("check address");
return false;
}
var mexp=/^(7|8|9)\d{9}$/;
res=mexp.test(phoneno);
if(!res)
{
alert("phoneno must start with 7,8 or 9");
return false;
}
//email ID
var emailid=document.f.emailid.value;
var mailxp=/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
if(!mailxp.test(emailid))
{
alert("check emailid");
return false;
}
}
</script>
</head>
<center><img border="0" src="Student Info Systems.jpg" alt="Pulpit rock" width="304" height="228" /></center><body text="blue">
<form action="stinsrt.jsp" method="post" name="f" onSubmit="return validate();">
<center><h2>STUDENT REGISTRATION</h2>
<pre>
<table width="50%">
<tr><td> Firstname:</td><td><input type="text" name="fname" size="15"/></td></tr>
<tr><td> Lastname:</td><td><input type="text" name="lname" size="15"/></td></tr>
<tr><td> Guardian/Parent Name:</td><td><input type="text" name="faname" size="15"/></td></tr>
<tr><td>D.O.B:</td><td><select name="DateOfBirth_Month">
<option> - Month - </option>
<option value="Jan">Jan</option>
<option value="Feb">Feb</option>
<option value="Mar">Mar</option>
<option value="Apr">Apr</option>
<option value="May">May</option>
<option value="Jun">Jun</option>
<option value="Jul">Jul</option>
<option value="Aug">Aug</option>
<option value="Sep">Sep</option>
<option value="Oct">Oct</option>
<option value="Nov">Nov</option>
<option value="Dec">Dec</option>
</select>
<select name="DateOfBirth_Day">
<option> - Day - </option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
<select name="DateOfBirth_Year">
<option> - Year - </option>
<option value="04">2004</option>
<option value="03">2003</option>
<option value="02">2002</option>
<option value="01">2001</option>
<option value="00">2000</option>
<option value="99">1999</option>
<option value="98">1998</option>
<option value="97">1997</option>
<option value="96">1996</option>
<option value="95">1995</option>
<option value="94">1994</option>
<option value="93">1993</option>
<option value="92">1992</option>
<option value="91">1991</option>
<option value="90">1990</option>
<option value="89">1989</option>
<option value="88">1988</option>
<option value="87">1987</option>
<option value="86">1986</option>
<option value="84">1984</option>
<option value="83">1983</option>
<option value="82">1982</option>
<option value="81">1981</option>
<option value="80">1980</option>
<option value="79">1979</option>
<option value="78">1978</option>
<option value="77">1977</option>
<option value="76">1976</option>
<option value="75">1975</option>
<option value="74">1974</option>
<option value="73">1973</option>
<option value="72">1972</option>
<option value="71">1971</option>
<option value="70">1970</option>
<option value="69">1969</option>
<option value="68">1968</option>
<option value="67">1967</option>
<option value="66">1966</option>
<option value="65">1965</option>
<option value="64">1964</option>
<option value="63">1963</option>
<option value="62">1962</option>
<option value="61">1961</option>
<option value="60">1960</option>
<option value="59">1959</option>
<option value="58">1958</option>
<option value="57">1957</option>
<option value="56">1956</option>
<option value="55">1955</option>
<option value="54">1954</option>
<option value="53">1953</option>
<option value="52">1952</option>
<option value="51">1951</option>
<option value="50">1950</option>
<option value="49">1949</option>
<option value="48">1948</option>
<option value="47">1947</option>
<option value="46">1946</option>
<option value="45">1945</option>
<option value="44">1944</option>
<option value="43">1943</option>
<option value="42">1942</option>
<option value="41">1941</option>
<option value="40">1940</option>
<option value="39">1939</option>
<option value="38">1938</option>
<option value="37">1937</option>
<option value="36">1936</option>
<option value="35">1935</option>
<option value="34">1934</option>
<option value="33">1933</option>
<option value="32">1932</option>
<option value="31">1931</option>
<option value="30">1930</option>
<option value="29">1929</option>
<option value="28">1928</option>
<option value="27">1927</option>
<option value="26">1926</option>
<option value="25">1925</option>
<option value="24">1924</option>
<option value="23">1923</option>
<option value="22">1922</option>
<option value="21">1921</option>
<option value="20">1920</option>
<option value="19">1919</option>
<option value="18">1918</option>
<option value="17">1917</option>
<option value="16">1916</option>
<option value="15">1915</option>
<option value="14">1914</option>
<option value="13">1913</option>
<option value="12">1912</option>
<option value="11">1911</option>
<option value="10">1910</option>
<option value="09">1909</option>
<option value="08">1908</option>
<option value="07">1907</option>
<option value="06">1906</option>
<option value="05">1905</option>
<option value="04">1904</option>
<option value="03">1903</option>
<option value="02">1902</option>
<option value="01">1901</option>
<option value="00">1900</option>
</select></td></tr></tr>
<tr><td>Gender:</td><td><input type="radio" name="gend" value="male"/>Male <input type="radio" name="gend" value="female"/>Female</td></tr>
<tr><td>Phone no:</td><td><input type="text" name="phno" size="15"/></td></tr>
<tr><td>email ID:</td><td><input type="text" name="email" size="15"></td></tr>
<tr><td>Department:</td><td><select name="Department" >
<option value="1">CSE</option>
<option value="2">ECE</option>
<option value="3">EEE</option>
<option value="4">MECH</option>
<option value="5">MBA</option>
</select></td></tr></td></tr>
<tr><td>Address:</td><td><textarea name="add" rows="4" cols="20" ></textarea></td></tr>
<tr><td><input type="submit" name="sub" value="submit">
<input type="button" name="cancel" value="Cancel" onclick="window.location.replace('adminhome.html')"></td></t>
</table>
</pre>
</form>
</body>
</html>
请帮助我。
谢谢。
答案 0 :(得分:0)
清除表格对象字段中的数据“之后”通过循环将其插入。 如果用户需要知道他们在返回的页面中插入了什么,请使用HTML普通文本元素而不是表单来写入,或者至少从表单标记中删除表单请求URL。