jacobscript.java

Java in view PDF documents, the source code for the document. I hope someone can be improved.

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

import com.jacob.com.*;
import com.jacob.activeX.*;

public class JacobScript extends javax.servlet.http.HttpServlet 
{
  public void doGet(HttpServletRequest req, 
                    HttpServletResponse res) 
      throws ServletException
  {
    PrintWriter out = null;
    try
    {
      res.setContentType("text/html");
      out = res.getWriter();
      // display a form
      out.println("<h1>Enter a VBScript Expression</h1>");
      out.println("<form method=\"POST\" action=\"/JacobScript\">");
      out.println("<input name=\"expr\" type=\"text\" width=64>");
      out.println("<input type=\"submit\">");
      out.println("</form>");
    } catch (Exception e) {
      e.printStackTrace();
      out.println("<H2>Error:"+e+"</H2>");
    }
  }

  public void doPost(HttpServletRequest req, 
                    HttpServletResponse res) 
      throws ServletException
  {
    PrintWriter out = null;

    try 
    {
      res.setContentType("text/html");
      out = res.getWriter();
      // get what they typed in
      String expr = (String)req.getParameter("expr");
      // make sure we have a session
      HttpSession session = req.getSession(true);
      Object sControl = null;
      if (session.isNew()) 
      {
        // initialize the control and store it on the session
        String lang = "VBScript";
        ActiveXComponent sC = new ActiveXComponent("ScriptControl");
        sControl = sC.getObject();
        Dispatch.put(sControl, "Language", lang);
        session.putValue("control", sControl);
      }
      else
      {
        sControl = session.getValue("control");
      }
      Variant result = Dispatch.call(sControl, "Eval", expr);
      // display a form
      out.println("<h1>Enter a VBScript Expression</h1>");
      out.println("<form method=\"POST\" action=\"/JacobScript\">");
      out.println("<input name=\"expr\" type=\"text\" value=\""+expr+"\" width=64>");
      out.println("<input type=\"submit\">");
      out.println("</form>");
      out.println("<H1>Jacob Response:</H1>");
      out.println("<H2>"+result+"</H2>");
    } catch (Exception e) {
      e.printStackTrace();
      out.println("<H2>Error:"+e+"</H2>");
    }
  }
}