Hello everyone,
I wrote a simple servlet application which take the user input from a
web page and return it to a html page.
The problem is by testing if the value is null or not.
It suppose to return some massage if the value is null, let's say "No
value" and the value, if it's not null.
Here is some source code :
import java.io.*;
import java.lang.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class EinfachesServlet extends HttpServlet{
public void doPost (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML><HEAD><title>Example</title></HEAD>" + "<body
bgcolor=FFFFFF>");
out.println("<table >");
out.println("<tr>");
out.println("<th></th>");
//out.println("<th></th>");
out.println("</tr> ");
out.println("<tr> ");
String NAME = request.getParameter("Name" );
String Result = "No value";
if (NAME==null){
out.println("<td>"+ Result.toString() + "</td> ");
} else {
out.println("<td>Name entered:"+NAME.toString()+ "</td>");
}
out.println("</tr>");
out.println("<tr>");
String DATE = request.getParameter("Datum");
if (DATE !=null){
out.println("<td>Date entered:"+ DATE + "</td>");
} else {
out.println("<td>No value</td>");
}
out.println("</tr>");
out.println("</table> ");
out.println("Return to: <A HREF=../Projekt.html>Projekt </A>");
out.println("</body></HTML>");
out.close();
}
}
If there is not input I get the message "Name entered: " instead of "No
value".
What should I change ? The first time I used ...if (Name != null) {...do
something} just like the second part with the date.
The second time I tried to make an Object using the new(String Name =
new String(request.getParameter("Name") )
but it steel didn't work fine.
Please send me some solutions.
Thank you very much.
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