Hi Ralf!
Your html file seems to send the following parameters to your servlet:
cos= one of AI, MI, TI, WI, according to your selection
what = tplan (* always tplan, never lplan *)
Check it by setting FORM method = "GET" as following:
<FORM ACTION="http://onyx:8080/wdbserv/dispatcher.main" METHOD="GET">
When you click 'Abfrage starten' button, the location (or address)
field in web browser shows the paratmers sent to the servlet just like
following:
http://onyx:8080/wdbserv/dispatcher.main?cos=WI&what=tplan
Therefore, your doGetOrPost function in servlet code always calls
doTest(req.getParameter("cos")). And doTest function always println
"doTest: cos" because you send "cos" string, not cos parameter
as argument to doTest function.
I didn't run your code actually. So my thought may be wrong.
Please check by yourself and I'll appreciate if you notify the result.
Good luck!
Ralf Weidemann wrote:
>
> >>>>> On Fri, 12 Mar 1999 09:27:00 +0900, Sung-Gwan Heo <[EMAIL PROTECTED]> said:
>
> Sung-Gwan> Ralf Weidemann wrote:
> >> I get only one time the right output from my servlet then it
> >> shows every time the same until I touch (or recompile) the class
> >> file. It get called over a FORM via POST. It should show up
> >> something different (depends on what I choosed in the OPTION
> >> menu). Why it will only show up the right after I touch the class
> >> ? What's the problem here ??
>
> Sung-Gwan> Servlets are loaded when web server begins. So, try to
> Sung-Gwan> shutdow web server and restart it.
>
> Sung-Gwan> $ apachectl stop $ apachectl restart
>
> No, that's not the problem. Below you could see the source
> of the servlet and of the html page that calls the servlet
> and I get exact one time the right output and then if I make
> a new choose I get every time the output from the first choose
> until I touch the class file so that it get loaded again
> from jserv. I'm new to this and I have no clue why this
> happens..
>
> Ralf
>
> <HTML>
> <HEAD>
> </HEAD>
> <BODY>
> <FORM ACTION="http://onyx:8080/wdbserv/dispatcher.main" METHOD="POST">
> Studiengang: <P>
> <SELECT NAME="cos">
> <OPTION VALUE="AI"> AI
> <OPTION VALUE="MI"> MI
> <OPTION VALUE="TI"> TI
> <OPTION VALUE="WI"> WI
> </SELECT>
> <P>
> <BR>
> <P>
> <BR>
> <P>
> <INPUT TYPE="hidden" NAME="what" VALUE="tplan">
> <INPUT TYPE="submit" VALUE="Abfrage starten">
> </FORM>
> <P>
> <BR>
> <P>
> <BR>
> <P>
> </FORM>
> </BODY>
> </HTML>
>
> import java.io.*;
> import java.net.*;
> import java.sql.*;
> import java.util.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
>
> public class main extends HttpServlet
> {
> static private Connection con = null;
> static private Statement stmt = null;
>
> String url = "jdbc:postgresql://onyx/test";
> String user = "test";
> String pass = "test";
>
> ByteArrayOutputStream bs = new ByteArrayOutputStream(100000);
> PrintWriter out = new PrintWriter(new OutputStreamWriter(bs));
>
> public void init(ServletConfig config) throws ServletException
> {
> String driver = "postgresql.Driver";
> try
> {
> Class.forName(driver);
> System.err.println(this.toString()
> + ": jdbc driver "
> + driver + " loaded");
> }
> catch(ClassNotFoundException e)
> {
> System.err.println(this.toString()
> + ": jdbc driver "
> + driver + " not loaded");
> e.printStackTrace(System.err) ;
> }
> super.init(config);
> }
>
> public String getServletInfo()
> {
> return "WDB-DISPATCHER";
> }
>
> /**
> * <p>Do GET-Requests</p>
> */
> public void doGet (HttpServletRequest req,
> HttpServletResponse res)
> throws ServletException, IOException
> {
> doGetOrPost (req, res);
> }
>
> /**
> * <p>Do POST-Requests</p>
> */
> public void doPost (HttpServletRequest req,
> HttpServletResponse res)
> throws ServletException, IOException
> {
> doGetOrPost (req, res);
> }
>
> /**
> * <p>GET/POST-Requests work the same..</p>
> */
> private void doGetOrPost (HttpServletRequest req,
> HttpServletResponse res)
> throws ServletException, IOException
> {
> try
> {
> if (con == null || con.isClosed())
> {
> con = DriverManager.getConnection(url, user, pass);
> }
> }
> catch (Exception ex)
> {
> out.println("<PRE>");
> out.println(ex.getMessage());
> ex.printStackTrace(out);
> out.println("</PRE>");
> try
> {
> con.close();
> }
> catch (Exception ex2)
> {
> }
> con = null;
> stmt = null;
> }
>
> String what = req.getParameter("what");
> try
> {
> if (what.equals("tplan"))
> {
> doTest(req.getParameter("cos"));
> }
> else if (what.equals("lplan"))
> {
> doLesson(req.getParameter("cos"),
> req.getParameter("sem"));
> }
> else
> {
> out.println("<PRE>wdbserv error: unknown 'what'");
> }
> }
> catch (Exception ex)
> {
> out.println("<PRE>");
> out.println(ex.getMessage());
> ex.printStackTrace(out);
> out.println("</PRE>");
> }
>
> /* that's the end my friend */
> out.close();
> res.setContentType("text/html");
> res.setContentLength(bs.size());
> bs.writeTo(res.getOutputStream());
> }
>
> void doTest (String cos)
> {
> out.println("<HTML>");
> out.println("doTest: ");
> out.println(cos);
> out.println("</HTML>");
> }
>
> void doLesson (String cos, String sem)
> {
> out.println("<HTML>");
> out.println("doLesson: ");
> out.println(cos + sem);
> out.println("</HTML>");
> }
> }
--
Heo, Sung-Gwan
Software Engineer mailto:[EMAIL PROTECTED]
R&D Center phone:+82-415-861-3887
Turbo-Tek Co., Ltd. http://www.turbotek.co.kr
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