at least 2 ways to determine the button selected
1)set a boolean property which is enabled on or off based on executed button
class MyAction extends ActionSupport {
private boolean submit;
private boolean clear;
public void setSubmit(boolean submit) {
this.submit = submit;
}
public void setClear(boolean clear) {
this.clear = clear;
}
public String execute() {
if (submit) {
doSubmit();
return "submitResult";
}
if (clear) {
doClear();
return "clearResult";
}
return super.execute();
}
}2)check the name of the button as indicated here
class MyAction extends ActionSupport {
private String buttonName;
public void setButtonName(String buttonName) {
this.buttonName = buttonName;
}
public String execute() {
if ("Submit".equals(buttonName)) {
doSubmit();
return "submitResult";
}
if ("Clear".equals(buttonName)) {
doClear();
return "clearResult";
}
return super.execute();
}
}http://cwiki.apache.org/WW/multiple-submit-buttons.html
many other solutions are available from devs
Martin
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> From: siom...@portosdobrasil.gov.br
> To: users@tomcat.apache.org
> Subject: Problems downloading files. How to identify the CANCEL button?
> Date: Tue, 7 Jul 2009 15:09:05 -0300
>
> Dear all,
>
> I need to log some information only after a user downloads or opens a file.
>
> I am using a servlet for that and the download part works fine.
>
> However I need to identify which button was clicked because in case the user
> clicks [CANCEL] I am not supposed to register any information.
>
> I put lots of messages on the code to understand how it works and even if I
> click [CANCEL] the messages will be printed showing that all commands will
> be executed no matter which button was clicked.
>
> Can someone help me to identify which button was clicked?
>
> Thanks
>
> Siomara
>
> ===================
> package servlets.comum;
>
> import java.io.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
>
>
> /**
> * Definition of class DownloadFile.
> */
>
> public class DownloadFile extends HttpServlet
>
> {
>
> private String original_filename = "MYFILE.txt";
>
> private String filename="C:\\ABC.txt";
>
> /**
> * Processes requests for both HTTP >GET and POST methods.
> * @param request servlet request
> * @param response servlet response
> */
>
> protected void processRequest(HttpServletRequest request,
> HttpServletResponse response)
>
> throws ServletException, IOException
>
> {
>
> File f = new File(filename);
>
> int length = 0;
>
> ServletOutputStream op = response.getOutputStream();
>
> ServletContext context =
> getServletConfig().getServletContext();
>
> String mimetype = context.getMimeType( filename );
>
> System.out.println("here 1");
>
> // Set the response and go!
>
> response.setContentType( (mimetype != null) ? mimetype :
> "application/octet-stream" );
>
> response.setContentLength( (int)f.length() );
>
> response.setHeader( "Content-Disposition", "attachment; filename=\""
> + original_filename + "\"" );
>
> System.out.println("here 2");
>
> // Stream to the requester.
>
> byte[] bbuf = new byte[filename.length()];
>
> DataInputStream in = new DataInputStream(new FileInputStream(f));
>
> while ((in != null) && ((length = in.read(bbuf)) != -1))
>
> {
> op.write(bbuf,0,length);
> }
>
> System.out.println("here 3");
>
> in.close();
>
> System.out.println("here 4");
>
> op.flush();
>
> System.out.println("here 5");
>
> op.close();
>
> System.out.println("here 6");
>
> }
>
> /**
> * Handles the HTTP GET method.
> * @param request servlet request
> * @param response servlet response
> */
>
> protected void doGet(HttpServletRequest request, HttpServletResponse
> response)
>
> throws ServletException, IOException {
>
> processRequest(request, response);
>
> }
>
> /**
> * Handles the HTTP POST method.
> * @param request servlet request
> * @param response servlet response
> */
>
> protected void doPost(HttpServletRequest request, HttpServletResponse
> response)
>
> throws ServletException, IOException {
>
> processRequest(request, response);
>
> }
>
> /**
> * Returns a short description of the servlet.
> */
>
> public String getServletInfo() {
>
> return "Short description";
>
> }
>
> }
>
> ==============================
> Results:
>
> [Tue Jul 07 10:39:43 BRT 2009] info: postgres: Opened a new connection
> [Tue Jul 07 10:39:43 BRT 2009] info: postgres: Delivered connection from
> pool
> select arquivolicitacao.licitacaoid, arquivolicitacao.arquivoid,
> arquivo.tipoarquivoid, arquivo.tituloapresentacao, arquivo.nomeinterno,
> arquivo.localizacaofisica, arquivo.datapublicacaodou, tipoarquivo.descricao
> from arquivolicitacao, arquivo, tipoarquivo where
> arquivolicitacao.licitacaoid = 5 and arquivolicitacao.arquivoid =
> arquivo.arquivoid and arquivo.tipoarquivoid = tipoarquivo.tipoarquivoid
> order by datapublicacaodou desc
> here 1
> here 2
> here 3
> here 4
> here 5
> here 6
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