I am using the sendRedirect() method. But it doesn't. Please have a look at the following code:-
<%#page import="utility.ConnectionClass,java.sql.* "%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>processadmin</title>
</head>
<body>
<%
Connection con=null;
ConnectionClass obj=new ConnectionClass();
con=obj.createConnection(con);
String user=request.getParameter("user");
String pass=request.getParameter("pass");
String sql="select * from admin where username='"+user+"'";
Statement stat=con.createStatement();
ResultSet rs=stat.executeQuery(sql);
rs.next();
if((rs.getString(1)==user)&&(rs.getString(2)==pass))
response.sendRedirect("processadmin.jsp");
else
out.println("Not working");
%>
</body>
</html>
And when I run this I get the output :- Not Working
Compare String using equals() method . == compares String references , not actual contents of the String.
if(user.equals(rs.getString(1)) && pass.equals(rs.getString(2)))
Note:- Please don't use scriptlets in JSP . It is a bad practice. Read this.
Related
I have this JSP code for my web app:
I am getting a syntax error at "Delete" in the success clause. Can anyone help me to pinpoint the problem? Thank you, appreciate it!
<%# 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>atozknowledge.com demo loginjsp</title>
</head>
<body>
<%# page import="java.sql.*"%>
<%# page import="javax.sql.*"%>
<%
String userid=request.getParameter("usr");
session.putValue("userid",userid);
String pwd=request.getParameter("pwd");
Class.forName("com.mysql.jdbc.Driver");
java.sql.Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/tomcat","root","root");
Statement st= con.createStatement();
ResultSet rs=st.executeQuery("select * from users where userid='"+userid+"'");
if(rs.next())
{
if(rs.getString(2).equals(pwd))
{
out.println("welcome"+userid);
Delete
}
else
{
out.println("Invalid password try again");
}
}
else
%>
Home
</body>
</html>
Delete isn't valid Java code. If you want to get out of the Java scriptlet, use %> to do so (then <% to go back into it):
%>Delete<%
Your tag is inserted inside a Java Part of code. Juste move your tag or close your scriptlet
if(rs.getString(2).equals(pwd))
{
out.println("welcome"+userid);
%>
Delete
<%
}
else
{
out.println("Invalid password try again");
}
I am trying to dynamically generate a list of dates without duplicates in JSP to display in a selector tag.
In my servlet class:
query = " SELECT * FROM visits";
prepStatement = connection.prepareStatement(query);
results = prepStatement.executeQuery();
Set<Date> vdates = new HashSet<>();
while(results.next()){
vdates.add(results.getDate("date"));
}
Date[] dates = vdates.toArray(new Date[vdates.size()]);
out.println(vdates);
request.setAttribute("dates", dates);
RequestDispatcher dispatcher = request.getRequestDispatcher("/js/selectorJSP.jsp");
dispatcher.forward(request, response);
In my selectorJSP file:
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Selector Page</title>
<script src="js/jquery-2.1.4.min.js"></script>
<script>
</script>
</head>
<body>
<h1>Hello World!</h1>
<select>
<option value="AllRecords">${dates[0]}</option>
</select>
<input type="button" onclick="" value="Download">
</body>
</html>
The result is that it just shows an empty field, I am trying to show one to make sure it works and make a loop to show all available dates in selector but not available.
This is my current JSP code:
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<jsp:useBean id="user" class= "uts.wsd.User" scope="session" ></jsp:useBean>
<%
String name = request.getParameter("name");
String email = request.getParameter("email");
String password = request.getParameter("password");
String gender = request.getParameter("gender");
String color = request.getParameter("favcol");
user.setName(name);
user.setEmail(email);
user.setPassword(password);
user.setGender(gender);
user.setFavouriteColour(color);
%>
<body style="background: <%= color %>;">
<% if (request.getParameter("tos") == null ) {%>
<p>
Sorry, you must agree to the Terms of Service.</p>
<p>Click <a href="register.jsp" > here </a> to go back.
</p>
<%} else { %>
<jsp:forward page="index.jsp" />
<% } %>
</html>
Here I use jsp:forward page="index.jsp" to redirect to index.jsp page. Then, if I want to use response.sendRedirect("index.jsp")? How can I proceed?
I tried this:
<% if (request.getParameter("tos") == null ) {%>
<p>
Sorry, you must agree to the Terms of Service.</p>
<p>Click <a href="register.jsp" > here </a> to go back.
</p>
<%} else { %>
<response.sendRedirect("index.jsp")>
<% } %>
</html>
But it failed. Please help! Thank you!!
response.sendRedirect() is Java code not a tag, so you should not close the scriptlet tags before typing it, and it is not to be preceded by < and closed with >...its just Java code:
<%
}
else
{
response.sendRedirect("index.jsp");
return; //this is to redirect immediately so it doesn't
//run any code below this point before redirecting
}
%>
Trying to display the current date on a page in JSP but getting odd error codes. Any idea what I am doing wrong?
<% Date today = new Date(); %>
<%!
public String displayDate(Date date){
return date.toString();
}
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Welcome!</title>
</head>
<body>
<h1><center>Today's Date is: <%displayDate(<%=today%>);%></center></h1>
This
<%displayDate(<%=today%>);%>
should be something like
<%= displayDate(today); %>
Also, I'd recommend you migrate away from scriptlets.
I am trying to get data from mysql and set the all data in xml format but I am unable to do this task. My code is:
abc.jsp
<%# 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>
<%
try
{
Connection connection=DBCreation.getConnection();
Stirng query="select latitude,longitude,time from jam_info";
Statement stmt=connection.createStatement();
ResultSet rs=stmt.executeQuery(query);
%></body>
</html>
<%# page contentType="text/xml" %>
<markers>
<marker>
<latitude></latitude>
<longitude></longitude>
<time>100</time>
</marker>
</markers>
I think this is wrong. Please guide me.
You can do something like this getXXX method will depend upon the type of the column holding the value.
<%# page language="java" contentType="text/xml; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%
Connection connection=DBCreation.getConnection();
Stirng query="select latitude,longitude,time from jam_info";
Statement stmt=connection.createStatement();
ResultSet rs=stmt.executeQuery(query);
response.setContentType("text/xml");
out.println("<markers>");
while(rs.next()) {
out.println("<marker>");
out.println("<latitude>" + rs.getXXX("latitude") + "</latitude>");
out.println("<longitude>" + rs.getXXX("longitude") + "</longitude>");
out.println("<time>" + rs.getXXX("time") + "</time>");
out.println("</marker>");
}
out.println("</markers>");
%>
Hope this helps.