I'm trying to make an quiz and my query is ORDER BY RAND() so it means it will be random... My JSP send it to servlet to handle the flow but I'm having a problem, I have stored 4 questions with choices (answer) in the database and in my code below I retreive it. Problem is, when I retrieve the answer of the examinee the only retrieved data is the first answer... See my servlet
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<%#page import="java.sql.*" %>
<%#page import="database.Connect" %>
<%
Connect conn = new Connect();
Statement stmt = conn.getDataConn().createStatement();
ResultSet rs = stmt.executeQuery("SELECT * from quiz WHERE category = 'secondary' ORDER BY RAND()");
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="../../css&js/des.css">
<script src="css&js/modernizr.custom.js"></script>
<title>Question 1</title>
</head>
<body>
<img alt="" src="../../pics/bgimg2.jpg" id="bgimg" />
<div class="md-modal md-effect-1 md-show" id="modal-1">
<form action="../../Check" method="POST">
<table border="1" class="c-form md-content">
<% while(rs.next()){
%>
<tr>
<td><h1><%=rs.getString("question")%>?</h1></td>
<td><select name="answer">
<option value="<%=rs.getString("choice1")%>"><%=rs.getString("choice1")%></option>
<option value="<%=rs.getString("choice2")%>"><%=rs.getString("choice2")%></option>
<input type="hidden" name="correct" value="<%=rs.getString("correct")%>"/>
</select></td>
</tr>
<%}
%>
<tr>
<td align="center" colspan="2"><input type="submit" value="Next"/></td>
</tr>
</table>
</form>
</div>
</body>
I'm trying to make an quiz and my query is ORDER BY RAND() so it means it will be random... My JSP send it to servlet to handle the flow but I'm having a problem, I have stored 4 questions with choices (answer) in the database and in my code below I retreive it. Problem is, when I retrieve the answer of the examinee the only retrieved data is the first answer... See my servlet
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<%#page import="java.sql.*" %>
<%#page import="database.Connect" %>
<%
Connect conn = new Connect();
Statement stmt = conn.getDataConn().createStatement();
ResultSet rs = stmt.executeQuery("SELECT * from quiz WHERE category = 'secondary' ORDER BY RAND()");
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="../../css&js/des.css">
<script src="css&js/modernizr.custom.js"></script>
<title>Question 1</title>
</head>
<body>
<img alt="" src="../../pics/bgimg2.jpg" id="bgimg" />
<div class="md-modal md-effect-1 md-show" id="modal-1">
<form action="../../Check" method="POST">
<table border="1" class="c-form md-content">
<% while(rs.next()){
%>
<tr>
<td><h1><%=rs.getString("question")%>?</h1></td>
<td><select name="answer">
<option value="<%=rs.getString("choice1")%>"><%=rs.getString("choice1")%></option>
<option value="<%=rs.getString("choice2")%>"><%=rs.getString("choice2")%></option>
<input type="hidden" name="correct" value="<%=rs.getString("correct")%>"/>
</select></td>
</tr>
<%}
%>
<tr>
<td align="center" colspan="2"><input type="submit" value="Next"/></td>
</tr>
</table>
</form>
</div>
</body>
Servlet... Im just trying to experiment here but I really need help.. The output is null for the for and past code are also fail because the 1st answer is the olnly retrieve and I need to increment it. Please help
package Servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Check extends HttpServlet {
#Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
for(int i=0;i<10;i++) {
String Answer = request.getParameter("answer" + i);
System.out.println(Answer);
}
String Answer = request.getParameter("answer");
String Correct = request.getParameter("correct");
int score = 0;
if (Answer.equals(Correct)) {
score++;
}
System.out.println(score);
}
}
It is may be because you select tags has the same name for every question:
<select name="answer">
I think it should unique
Related
I am new to jsp. I am trying to insert data into the table through a jsp page. My code is running fine all the values are correctly passing to the statement. But, after the last value it should move to the executeUpdate command but it moved to the return command instead which returns 0 and data does not inserted into the database. My code is here.
RegisterDao.java
package RegBean;
import java.sql.*;
/**
*
* #author syedahmed
*/
public class RegisterDao {
public static int register(user u){
int status = 0;
try{
Connection con = ConnectionProvider.getCon();
PreparedStatement ps = con.prepareStatement("insert into register(uname,ulogin,upass,Gender,ucontact,Email) values(?,?,?,?,'',?)");
ps.setString(1,u.getUname());
ps.setString(2,u.getUlogin());
ps.setString(3,u.getUpass());
ps.setString(4,u.getGender());
ps.setString(5,u.getUcontact());
ps.setString(6,u.getEmail());
status=ps.executeUpdate();
}catch(Exception e){}
return status;
}
}
process.jsp
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<%#page import = "RegBean.RegisterDao"%>
<jsp:useBean id="obj" class="RegBean.user"/>
<jsp:setProperty property="*" name="obj"/>
<%
int status = RegisterDao.register(obj);
if(status>0)
out.print("You are successfully Logged in");
else
out.print("unsuccessful");
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>
index.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<form action="process.jsp">
<input type="text" name="uname" value="Name..." onclick="this.value=''"/><br/>
<input type="text" name="ulogin" value="Login ID..." onclick="this.value=''"/><br/>
<input type="password" name="upass" value="Password..." onclick="this.value=''"/><br/>
<input type="radio" name="gender" value="Male"> Male<br>
<input type="radio" name="gender" value="Female"> Female<br>
<input type="radio" name="gender" value="Other"> Other<br>
<input type="text" name="ucontact" value="Contact#..." onclick="this.value=''"/><br/>
<input type="email" name="email" value="email..." onclick="this.value= ''"/><br/>
<input type="submit" value="register"/>
</form>
</html>
It's mean that you code executed in the try section failed. Display the stacktrace in the catch section to see errors.
try{
...
}catch(Exception e){
e.printStackTrace()
}
problem has been resolved.. there was a mistake in the query..
"insert into register(uname,ulogin,upass,Gender,ucontact,Email) values(?,?,?,?,'',?)" ..
I am creating a web application in java jsp using Eclipse and Tomcat.but I am stock unable to insert the data in to my local SQL server. The Form of the page is coded in HTML then I want the Java code part to get the data entered and insert the data in to the database but when I click the submit button absolutely nothing happens, no error message, no warning so far I am only able to type and clear the form. I am very new in Java. I just pick up this codding language recently but I am determine to learn it.
Help please here is my full code.
<%# page import="java.text.*,java.util.*" session="false"%>
<%# page import="java.sql.*" %>
<%#page import="javax.swing.JOptionPane" %>
<%#page import="java.util.Date" %>
<%#page import ="java.io.IOException" %>
<%#page import ="javax.servlet.ServletException" %>
<%#page import ="javax.servlet.http.HttpServlet" %>
<%#page import ="javax.servlet.http.HttpServletRequest" %>
<%#page import ="javax.servlet.http.HttpServletResponse" %>
<% Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); %>
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert Laptops Data</title>
<link rel="stylesheet" href="Style.css" type="text/css">
</head>
<body>
<%!public class Insert extends HttpServlet {
String dbURL = "jdbc:sqlserver://localhost\\SQLYRSIN";
String user = "pass";
String pass = "pass";
Connection conn = null;
PreparedStatement InsertLaptops = null;
ResultSet resultSet = null;
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String LaptopMake, LaptopModel, LaptopServicetag, LaptopDatein, LaptopNotes, LaptopType;
LaptopMake = req.getParameter("iMake");
LaptopModel = req.getParameter("iModel");
LaptopServicetag = req.getParameter("iServiceTag");
LaptopDatein = req.getParameter("iDatein");
LaptopNotes = req.getParameter("iNotes");
LaptopType = req.getParameter("iType");
try {
conn = DriverManager.getConnection(dbURL, user, pass);
Statement st = conn. createStatement();
st.executeUpdate("INSERT INTO LaptopsTable (Make, Model, [Service Tag], Datein, Notes, Type)"
+ " VALUES ('"+LaptopMake+"','"+LaptopModel+"','"+LaptopServicetag+"','"+LaptopDatein +"','"+LaptopNotes+"','"+LaptopType+"')");
JOptionPane.showConfirmDialog(null, "Your Data Has been Inserted", "Result", JOptionPane.DEFAULT_OPTION,
JOptionPane.PLAIN_MESSAGE);
st.close();
conn.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
}%>
<div id="header">
<div class="logo">
<span> Resident Screening</span> Jinventory
</div>
</div>
<div id="container">
<div class="content">
<h1>Add New Laptop</h1>
<p>Make sure all Service Tag Enter in here are Laptops</p>
<div id="box">
<form name="LaptopsForm" method="get" class="contentfonts"
action="LaptopsInsert2.jsp" method="Post">
<table>
<tbody>
<tr>
<td>Service Tag</td>
<td><input type="text" name="iServiceTag" size="40"></td>
</tr>
<tr>
<td>Make</td>
<td><input type="text" name="iMake" size="40"></td>
</tr>
<tr>
<td>Model</td>
<td><input type="text" name="iModel"></td>
</tr>
<tr>
<td>Date</td>
<td><input type="date" name="iDate"></td>
</tr>
<tr>
<td>Type</td>
<td><input type="text" name="iTyped" Value="Laptop"
disabled="disabled"></td>
</tr>
<tr>
<td>Notes</td>
<td><input Type="text" name="iNotes" size="30" height="40"></td>
</tr>
<tr>
<td><input type="reset" name="Reset"></td>
<td><input type="submit" name="submit"></td>
</tr>
</tbody>
</table>
</form>
</div>
</div>
</div>
</body>
</html>
Here's a draft which you could use as a starting point.
As mentioned before, you should seriously consider some changes to your design:
Separate View (.jsp) from Business-Logic (SQL-Statements etc.)
Don't use scriptlets ( <% and so on )
Creating a Servlet within JSP is overkill - a JSP is compiled into a servlet by the servlet container.
Don't create Connections one-by-one. Use a connection pool. This will pay off quickly.
In the code you'll see some changes to your setup:
form is submitted per POST
instead of subclass, JSP checks for methods POST and only then tries the insert.
never ever use Swing inside Webapps. If that JOptionPane was opened, your webapp would block at that point, while the Dialog was shown somewhere on your server.
Use of PreparedStatement instead of Statement this prevents SQL injection. You'll still want to check against Cross-Site-Scripting if you plan on displaying the inserted values in your webapp again.
Disclaimer: I haven't tested or even tried to compile this code. Edit was done only to point you in the right direction.
Here it goes
<%#page import="java.text.*,java.util.*" session="false"%>
<%#page import="java.sql.*" %>
<%#page import="java.util.Date" %>
<%#page import ="java.io.IOException" %>
<%#page import ="javax.servlet.ServletException" %>
<%#page import ="javax.servlet.http.HttpServlet" %>
<%#page import ="javax.servlet.http.HttpServletRequest" %>
<%#page import ="javax.servlet.http.HttpServletResponse" %>
<% Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); %>
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert Laptops Data</title>
<link rel="stylesheet" href="Style.css" type="text/css">
</head>
<body>
<%
if("POST".equals(request.getMethod()) {
String dbURL = "jdbc:sqlserver://localhost\\SQLYRSIN";
String user = "pass";
String pass = "pass";
Connection conn = null;
PreparedStatement InsertLaptops = null;
ResultSet resultSet = null;
String LaptopMake, LaptopModel, LaptopServicetag, LaptopDatein, LaptopNotes, LaptopType;
LaptopMake = req.getParameter("iMake");
LaptopModel = req.getParameter("iModel");
LaptopServicetag = req.getParameter("iServiceTag");
LaptopDatein = req.getParameter("iDatein");
LaptopNotes = req.getParameter("iNotes");
LaptopType = req.getParameter("iType");
try {
conn = DriverManager.getConnection(dbURL, user, pass);
PreparedStatement st = conn.prepareStatement("INSERT INTO LaptopsTable (Make, Model, [Service Tag], Datein, Notes, Type) VALUES (?,?,?,?,?,?)");
st.setString(1, LaptopMake);
st.setString(2, LaptopModel);
st.setString(3, LaptopServicetag);
st.setString(4, LaptopDatein);
st.setString(5, LaptopNotes);
st.setString(6, LaptopType);
st.executeUpdate();
//This is SWING - and would at best popup a Dialog ON YOUR SERVER
//JOptionPane.showConfirmDialog(null, "Your Data Has been Inserted", "Result", JOptionPane.DEFAULT_OPTION,
// JOptionPane.PLAIN_MESSAGE);
//Alternative: Show some HTML.
%>
<h1>Your Data has been inserted.</h1>
<%
st.close();
conn.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
} //END of Method.equals("POST")
%>
<div id="header">
<div class="logo">
<span> Resident Screening</span> Jinventory
</div>
</div>
<div id="container">
<div class="content">
<h1>Add New Laptop</h1>
<p>Make sure all Service Tag Enter in here are Laptops</p>
<div id="box">
<form name="LaptopsForm" method="POST" class="contentfonts"
action="" method="POST">
<table>
<tbody>
<tr>
<td>Service Tag</td>
<td><input type="text" name="iServiceTag" size="40"></td>
</tr>
<tr>
<td>Make</td>
<td><input type="text" name="iMake" size="40"></td>
</tr>
<tr>
<td>Model</td>
<td><input type="text" name="iModel"></td>
</tr>
<tr>
<td>Date</td>
<td><input type="date" name="iDate"></td>
</tr>
<tr>
<td>Type</td>
<td><input type="text" name="iTyped" Value="Laptop"
disabled="disabled"></td>
</tr>
<tr>
<td>Notes</td>
<td><input Type="text" name="iNotes" size="30" height="40"></td>
</tr>
<tr>
<td><input type="reset" name="Reset"></td>
<td><input type="submit" name="submit"></td>
</tr>
</tbody>
</table>
</form>
</div>
</div>
</div>
</body>
</html>
Now i am doing this code which is working on submit button click.
<%#page import="java.sql.CallableStatement"%>
<%#page import="javax.imageio.ImageIO"%>
<%#page import="java.io.ByteArrayOutputStream"%>
<%#page import="java.awt.image.BufferedImage"%>
<%#page import="java.io.InputStream"%>
<%#page import="java.sql.ResultSet"%>
<%#page import="connectionss.Connectionss"%>
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="ShowUSerInfo.jsp" method="post">
<input type="text" name="tagID">
<input type="submit" value="Search" name="submit" >
</form>
<%
String TAGID="";
String y=request.getParameter("submit");
if("Search".equals(y))
{
TAGID = request.getParameter("tagID");
out.println(TAGID);
String GetUserpass = "{call sp_USerInfoByTagID(?)}";
//Connection conn = Connection.GetConnection();
CallableStatement cs;
cs = Connectionss.GetConnection().prepareCall(GetUserpass);
cs.setString(1,TAGID);
%>
<table border="1">
<th>First Name</th>
<th>last Name Name</th>
<th>Student ID</th>
<th>Address</th>
<th>NIC</th>
<%
ResultSet rs1;
rs1=cs.executeQuery();
while(rs1.next()){
String UserName=rs1.getString("fId_FirstName");
String UserID= rs1.getString("fId_User_UniversityID");
String Adress = rs1.getString("fId_Address");
String NIC = rs1.getString("fId_NIC");
String lastName = rs1.getString("fId_LastName");
%>
<tr >
<td><span style="color:red;"><%= UserName %></span></td>
<td> <span style="color:red;"><%= lastName %></span></td>
<td><span style="color:red;"><%= UserID %></span></td>
<td><span style="color:red;"><%= Adress %></span></td>
<td><span style="color:red;"><%= NIC %></span></td>
</tr>
</table>
<%}} %>
</body>
</html>
But i want to execute this code when text changes on input box. Basically text box is getting value from NFC cards. so when i tap my NFC card on Reader value is transfer to text box and at this time i want to execute my sql query that will take the user information against TAGID.
since jsp is server side you'll need to collect the input on client and make a ajax call.
<form action="ShowUSerInfo.jsp" method="post">
<input type="text" id="text" name="tagID">
<input type="submit" value="Search" name="submit" >
</form>
<div id="#res></div>
javascript :
$('#text').change(function(e){
$.ajax({url: "someurl", success: function(result){
$("#res").html(result);
}});
});
});
this will perfectly work in your case,
Let's say our HTML looks something like,
<form>
<input id="txt" type="text" name="name"/>
<input id="btn" type="button" value="change"/>
</form>
Java-Script like,
$(document).ready(function(){
$('#txt').keypress(function(e){
ontextchange();
});
$('#txt').keyup(function(e){
if(e.keyCode == 8)
{
//if user erase from text-box then comes here...
}
});
function ontextchange(){
//do whatever while text change, i.e. ajax call or something else...
}
});
I need to take the value of the select option to send it to another page to be processed, but can not capture the value.
any ideas?
the select is loaded from the database, that part works, shows the categories of product.
<%#page import="com.sun.xml.internal.txw2.Document"%>
<%#page import="java.util.ArrayList"%>
<%# page import = "com.seminario.beans.categoria" %>
<%# page import = "com.seminario.datos.DbCategoria" %>
<%# page import = "com.seminario.beans.Producto" %>
<%# page import = "com.seminario.datos.DbProducto" %>
<jsp:useBean id="dataProd" class="com.seminario.datos.DbProducto" scope="page"/>
<jsp:setProperty name="dataProd" property="*"/>
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<link href="../stylo.css" rel="stylesheet" type="text/css" media="screen" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Alta Producto</title>
</head>
<%
categoria c = new categoria();
DbCategoria bdc = new DbCategoria();
ArrayList <categoria> myList = new ArrayList();
myList = bdc.SelectAll();
%>
<body>
<h1>Nuevo Producto</h1>
<form name ='formulario' action='nuevoProducto.jsp' method='post' >
Descripcion<input name='descripcion' type='text' size='20' required><br>
Precio<input name='precio' type='text' size='20' required><br>
Stock<input name='stock' type='text' size='20' required><br>
**Categoria <select name="categoid" id="categoid">
<% for(int i=0;i<myList.size();i++){%>
<option value="<%= myList.get(i).getId() %>" > <%out.print(myList.get(i).getDescripcion());%></option>
<%}%>
</select><br>**
Imagen<input name="imagen" text="seleccionar archivo" type="file" size="10" accept="image/jpg" /><br>
<input type ="submit" value ='Guardar' />
<!-- <input type="submit" value="guardar">-->
</form>
<br><br><a href='menuAdmin.jsp'>Volver al menu principal</a>
</body>
</html>
In this code, when user adds delete button, raw is being deleted from database, but user is being redirected to empty home page, unless he logs out and logs in again. how can I fix the code, so that when he deletes something, whole layout is not disappearing, but only the line that he deleted.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<script type="text/javascript">
function del() {
if (confirm("Do You Want to Delete this Menu?")) {
} else {
return false;
}
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<link rel="stylesheet" href="images/style.css" type="text/css"
charset="utf-8" />
</head>
<body>
<%
menu_slno1 = request.getParameter("menu_slno");
if (menu_slno1 != null)
menu_slno = Integer.parseInt(menu_slno1);
delete_menu = request.getParameter("delete_menu");
if ("yes".equals(delete_menu)) {
MenuId = request.getParameter("MenuId");
x = stmt1
.executeUpdate("Delete from menu where MenuId="
+ MenuId);
}
%>
<center><h2>VIEW MENU</h2></center>
<center><table width="736" height="97" border="1"></center>
<%
if (x == 1) {
%>
<tr bgcolor="gray">
<th height="35" colspan="9"><div align="center">
Menu deleted successfully!
</div></th>
</tr>
<%
}
%>
<tr bgcolor="gray">
<td><div align="center">
<strong>Menu ID</strong>
</div></td>
<td><div align="center">
<strong>Name </strong>
</div></td>
<td><div align="center">
<strong>Info</strong>
</div></td>
<td><div align="center">
<strong>Price</strong>
</div></td>
<td colspan="2"><div align="center">
<strong>Action</strong>
</div></td>
</tr>
<%
String sUserID=request.getParameter("username");
session.setAttribute("username", sUserID);
int icount = 0;
rs = stmt.executeQuery("SELECT menu.menuID, menu.name, menu.info, menu.price, menu.RestaurantID FROM menu INNER JOIN clients ON menu.username = clients.username where menu.username='" +sUserID+ "'");
while (rs.next()) {
//menu_slno = rs.getInt("menu_slno");
MenuId = rs.getString("MenuId");
%>
<tr>
<td><div align="center"><%=++icount%></div></td>
<td><%=rs.getString("Name")%></td>
<td><%=rs.getString("Info")%></td>
<td><%=rs.getDouble("Price")%></td>
<td><div align="center">
Edit
</div></td>
<td><div align="center">
<a
href="view_menu.jsp?delete_menu=yes&MenuId= <%=MenuId%>&MenuId=<%=MenuId%>"
onclick="return del()">Delete</a>
</div></td>
</tr>
<%
}
%>
</table>
Add Menu
</body>
</html>
When a user clicks on the delete link, the username parameter is not set in the URL. So when the page refreshes, the String sUserID=request.getParameter("username"); call return null or empty, and then the rest of the page is not displayed because the following SQL Query returns nothing without a valid username.
It seems that you only need to add something like &username=<%=sUserID%> to your delete link to make it work:
Delete
P.S: I assume that this a legacy JSP, and that you have no choice but continuing using such ugly code. If you have a choice, I strongly recommend you to drop those scriptlets and this all-in-the-view architecture, and start using JSTL tags, servlets and beans.