Sebu,
Thanks. I have been trying the code with Richard's mods. and the URL given by you for the past few days, no luck. I am baffled by this. I have developed other simple servlets and also tried those from Jason Hunter's book and they work fine.
Any help would be appreciated.
Thanks
Ken
>From: Sebu Thomas K <[EMAIL PROTECTED]>
>Reply-To: "A mailing list for discussion about Sun Microsystem's Java Servlet API Technology." <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Re: servlet to read a file
>Date: Thu, 11 Oct 2001 07:56:23 +0530
>
>Hi Ken,
>
> Your original servlet class must be residing in
>webapps/root/web-inf/classes directory. Right? And you have put Note.txt
>in webapps/examples directory. Then what exactly are you asking your
>servlet to do? You are asking the servlet that is in the ServletContext
>"root" to read a file from a directory called"/webapps/examples"
>*starting from the current ServletContext ie. "root"*. So for your
>original code you would get real path as
>".../webapps/root/webapps/examples/Note.txt".
>
> That is why Richard told you to change the getRealPath("xxxx ") to
>"/Note.txt". Then the servlet would look in webapps/root directory. Or
>if you put your servlet in webapps/examples/web-inf/classes & Note.txt
>in webapps/examples it would work the same way. I tried your original
>code with the modification by Richard and it worked perfectly fine.
>
> MyServlet.class was put in webapps/examples/web-inf/classes and
>Note.txt in webapps/examples. You try it that way and also read more
>about ServletContext and webapps. Just do a search in the archives of
>this list & you are sure to get more info than you bargained for. The
>Servlet Specification also is a must-be-read.
>
> Oh, and my servlet URL was
>http://localhost:8080/examples/servlet/MyServlet
>
>Sebu
>
>ken dias wrote:
>
> >
> >
> > Hi Richard,
> >
> >
> >
> > Thanks for your response.
> >
> > I tried your code exactly, but it still does not read the file
> > Note.txt. It just ignores it as before. I get the response "Hello
> > World null Hello You,". I then deleted the dot before
> > webapps/examples/Note.txt, so I had
> > ---.getRealPath("/webapps/examples/Note.txt. In this case I got "Hello
> > Worldc:/tomcat/jakarta-tomcat-3.2.3/webapps/examples/Note.txt Hello
> > You,". Again. it ignored the statement out.print.ln(----+ sbuf +
> > ------);
> >
> > Which are the variables in the swing class you refer to?
> >
> > Regards
> >
> >
> >
> > Ken
> >
> >
> >
> > >From: Richard Yee
> > >Reply-To: "A mailing list for discussion about Sun Microsystem's Java
> > Servlet API Technology."
> > >To: [EMAIL PROTECTED]
> > >Subject: Re: servlet to read a file
> > >Date: Sun, 7 Oct 2001 14:56:55 -0700
> > >
> > >Ken,
> > >I was able to get the servlet code you sent to read a file. I had
> > >to make
> > >a few changes to your code b/c the parameter to getRealPath is
> > >wrong. The
> > >path should be specified relative to the root directory of the web
> > >app that
> > >your servlet is running in. In your case, it seems that you are
> > >running it
> > >in the 'examples' web app'. Therefore, the path is "/Note.txt".
> > >
> > >There are a few other things I noticed.
> > >1) You declare some variables from the Swing classes in your
> > >servlet. You
> > >can't use these in a servlet. You could use them in an applet that
> > >is
> > >displayed from a servlet, but then the Swing elements would be part
> > >of the
> > >applet code and not the servlet code.
> > >2) Some of your variables are class variables and not method
> > >variables. You need to be very careful about using class variables
> > >in a
> > >servlet. Most of the time you should use variables that are local
> > >to your
> > >methods. You are running the risk of running into thread safety
> > >problems
> > >when you use class variables. Basically, you might have multiple
> > >requests
> > >all accessing the same variables which can give you unexpected
> > >results.
> > >3) The html that your servlet outputs is incorrect. There are
> > >multiple
> > > tags and multiple tags.
> > >
> > >At 11:59 AM 10/7/01 -0400, you wrote:
> > >>import java.io.*;
> > >>import java.util.Enumeration;
> > >>import java.awt.*;
> > >>import javax.servlet.*;
> > >>import javax.servlet.http.*;
> > >>import java.awt.event.*;
> > >>import javax.swing.*;
> > >>/**
> > >>* This is a simple example of an HTTP Servlet that
> > >>* uses the HttpSession
> > >>* class
> > >>*
> > >>* Note that in order to gaurentee that session
> > >> * response headers are
> > >>* set correctly, the session must be retrieved before
> > >> * any output is
> > >>* sent to the client.
> > >>*/
> > >>public class MyServlet extends HttpServlet {
> > >>
> > >> JTextArea theTextArea = new JTextArea(20, 64);
> > >> JButton theReadButton = new JButton("Read");
> > >> String filename;
> > >>
> > >> public void doGet (HttpServletRequest req,
> > >> HttpServletResponse res)
> > >> throws ServletException, IOException
> > >> {
> > >> String path =
> > >>getServletConf
> > g().getServletContext().getRealPath("./webapps/examples/Note.txt");
> > >>
> > >> System.out.println(path);
> > >> StringBuffer sbuf = new StringBuffer();
> > >> try {
> > >> BufferedReader br = new BufferedReader (new FileReader(path));
> > >> while(true)
> > >> {
> > >> String s = br.readLine();
> > >> if (s == null)
> > >> {
> > >> break;
> > >> }
> > >> sbuf.append(s);
> > >> sbuf.append("\n");
> > >> }
> > >> }
> > >> catch (Exception e) {
> > >> }
> > >> res.setContentType("text/html");
> > >> // then write the data of the response
> > >> PrintWriter out = res.getWriter();
> > >> out.println("");
> > >> out.println("");
> > >> out.println("");
> > >> out.println("Hello World");
> > >> out.println("");
> > >> out.println(path);
> > >> out.println("");
> > >> out.println("");
> > >> out.println("HelloYou, ");
> > >> out.println("" + sbuf + "");
> > >> out.close();
> > >>
> > >> }
> > >>}
> > >
> > >
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