I am having trouble forwarding data from servlet to my jsp
Question
i am new to the servlet and jsp scene and was having trouble with getting my data from my servlet out to my jsp. I followed examples i found online and have done everything i know how to do in order to get data to my jsp.
Here is the code that i have for my servlet. I tried to pull all the data from the database and then forward that to jsp.
Another problem i had was that if i try to print any of the info to the console with system.out nothing shows.
I commented some stuff out to try and eliminate possible problem areas.
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
try
{
String query = "select * from PRODUCT_TABLE";
// connect to DB
Class.forName("oracle.jdbc.OracleDriver");
conn = DriverManager.getConnection("took this out for security");
Statement stmt = conn.createStatement();
// get info from DB
ResultSet rs = stmt.executeQuery(query);
while (rs.next())
{
// itemName = rs.getString("ITEM_NAME");
itemNum = rs.getString("ITEM_NUM");
itemPrice = rs.getString("ITEM_PRICE");
// compile all the data
/*itemNameComp[i] = itemName;
itemNumComp[i] = itemNum;
itemPriceComp[i] = itemPrice;
i++;*/
}
req.setAttribute("itemName", 567);
req.getRequestDispatcher("/StartShopping.jsp").forward(req, resp);
//String test = req.getParameter("itemName");
//rd.forward(req, resp);
//store info in the session object
// get selection from user and do calculation for total purchase
}
catch (Exception e)
{
e.printStackTrace();
}
in the code below i tried to hard code some value to try and see if i could at least get something to the jsp even if it wasnt from the data that i wanted.
req.setAttribute("itemName", 567);
req.getRequestDispatcher("/StartShopping.jsp").forward(req, resp);
The code that i used to call the hard set data in the JSP is below
<%=(String)request.getAttribute("itemName")%>
The code above prints "null" in the .jsp. i wanted to try and make it print just as a test to see if i could force it to work with hard data.
i tried changing it to req.getAttribute but the jsp wasnt happy with it
Any insight would be greatly appreciated. Thank you very much!!! i apologize if there is some obvious error but i can't find it.
2 answers
solution1
0 2014-01-17 01:21:45
Are you trying to just run the jsp file?
In that case the attribute is never forwarded from the servlet and the jsp page always prints null.
try to create a html file which invokes the post method in servlet:
<html>
<body>
<form action="/yourServletURL" method="post">
<input type="submit">
</form>
</body>
</html>
solution2
0 2014-01-17 10:17:27
May be because your are setting an integer and trying to typecast it to String Use the following code and check once
req.setAttribute("itemName", "567");
//instead of req.setAttribute("itemName", 567);
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