newbie question about servlets calling methods

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Posts: 49

posted 23 years ago

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i've written a class, Append.class, that has one method,
doAppend(String open, String write) that opens file "open" and adds a new line "write" to that file. if Append.class is in the same directory as a servlet i write, can the servlet create an Append object and call the doAppend() method of that object? here is all the code i am using, in this order:
Append.java: (what i am tryin to call from my servlet)

PassNgo.java (the servlet that should do the calling)

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class PassNgo extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    String toOpen = request.getParameter("toOpen");
    String toWrite = request.getParameter("toWrite");
    Append doIt = new Append();
doIt.doAppend(toOpen, toWrite);
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "Reading Three Request Parameters";
    out.println("<HTML>\n" +
        "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<H1 ALIGN=CENTER>" + title + "</H1>\n" +
                "<UL>\n" +
                "  <LI><B>File to Open</B>: "
                + toOpen + "\n" +
                "  <LI><B>Text to Add</B>: "
                + toWrite + "\n" +
                "</UL>\n" +
              "</BODY></HTML>");
  }
}

finally, the html page that gets the info

i would really appreciate any help, thanx
[This message has been edited by Eric Johnson (edited September 10, 2001).]

Madhav Lakkapragada

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Posts: 5040

posted 23 years ago

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In short, yes it is possible to do what you want.
Some comments....
- you don't need the main() method in the Append.java
- you need to import Append in your servlet.
- you are better of writing your own no argument constructor
for the Append class (a default is avail, but just good practice)
- your choice of varaibles "open" and "write" maynot a good
one, IMO anyways, these are method names in java so maybe confusing...

just a few of my thoughts....
- satya

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Eric Johnson

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Posts: 49

posted 23 years ago

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thanx for the response. i still am having no luck appending my text file though. here is the new PassNgo servlet code:

and here is the new Append:

i hope someone can straighten me out, i am tired of feeling stupid, thanx
[This message has been edited by Eric Johnson (edited September 10, 2001).]

Mahesh Rana

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Posts: 139

posted 23 years ago

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I am not sure, but did you try
FileWriter toWrite = new FileWriter(fileReference, true);
?

SCJP2

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