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 <[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: 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 =
>>getServletConfig().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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