Cannot save file to Apache Tomcat server

Thu, 15 Feb 2007 01:01:01 -0800 

Dear all,
   
  I really hope that someone can help me out. I have an error-free applet and 
servlet. When I type http://localhost:8080/examples/servlet/ServletIdea, an 
applet is loaded. From the applet, I type the file name in a text field and the 
file content in a text area. I want the file content to be saved in the 
specified file name. The problem is that the file cannot be saved to the 
server. I put ServletIdea.java in 
C:/jakarta-tomcat-4.1.31/webapps/examples/WEB-INF/classes. I put IdeaTool.java 
in C:/jakarta-tomcat-4.1.31/webapps/ROOT. The programs are as follows:
   
  //ServletIdea.java
  import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
   
  public class ServletIdea extends HttpServlet {
 
 public void doGet(HttpServletRequest req, HttpServletResponse res) throws 
IOException, ServletException
 {
  
  HttpSession session = req.getSession();
  PrintWriter out = res.getWriter();
  
  out.println("<html>");
  out.println("<head>");
  out.println("<title>Login</title>");
  out.println("<center><h2>Servlet Idea</h2>");
  out.println("<applet width=500 height=400");
  out.println("name=\"IdeaTool\"");
  out.println("codebase=\"/\"");
  out.println("code=\"IdeaTool\">");
  out.println("<param name=\"servlet\" value=\"" +
              req.getRequestURI() + "\">");
     out.println("<param name=\"id\" value=\"" +
                 session.getId() + "\">");
     out.println("</applet>");
     out.println("</center></body></html>"); 
   
 }
 
 public void doPost(HttpServletRequest req, HttpServletResponse res) throws 
IOException, ServletException
 {
  res.setContentType("text/html");
  DataInputStream in = new DataInputStream(req.getInputStream());
  PrintWriter out = res.getWriter();
  
  String filename = in.readUTF();
     String filecontent = in.readUTF();
     
     if (filename != null || filecontent != null) {
      out.println("filename="+filename+"<P>Next");
      out.println("filecontent="+filecontent);
     }
     
     else{
      out.println("requestparams.no-params");      
     }
     out.println("<P>");
     try {
      PrintWriter outFile = new PrintWriter(new OutputStreamWriter(new 
FileOutputStream("C://"+filename)));
      outFile.println(filecontent);
      outFile.close();
      }
      catch (FileNotFoundException e){
       out.println("Cannot open file "+filename);
      }
        catch (IOException e) {
         out.println("write data file IO exception");
        }
        out.close();
  
 }
 
}
   
  // IdeaTool.java
// Java core pakages
import java.awt.*;
import java.awt.event.*;
// Java extension packages
import javax.swing.*;
import javax.swing.JApplet;
import javax.swing.text.BadLocationException;
import java.net.*;
import java.io.*;
import java.util.*;
   
  public class IdeaTool extends JApplet implements ItemListener, ActionListener 
{
 
 JPanel panel1, panellabel, panelbutton, paneltext;
 
 JTextField namefile;
 
 JButton jbtSave;
 
 JTextArea textarea1;
 
    JLabel labelfile;
 
 String line;
 
 String codeBase, servlet, sessionId;
 
 public void init() {
  
  codeBase = "" + getCodeBase();
  servlet = getParameter("servlet");
  
  if (servlet != null)
  {
   if (servlet.startsWith("/") && codeBase.endsWith("/"))
   {
    codeBase = codeBase.substring(0, codeBase.length() - 1);    
   }
  }
  
  sessionId = getParameter("id");
  
  Container container = getContentPane();
   
  namefile = new JTextField(20);
    
  panel1 = new JPanel();
  panellabel = new JPanel();
  panelbutton = new JPanel();
  paneltext = new JPanel();
  
  labelfile = new JLabel("File Name");
  
  panellabel.setLayout(new FlowLayout(FlowLayout.LEFT,90,0));
  panellabel.add(labelfile);
  panellabel.add(namefile);
          
  panelbutton.setLayout(new GridLayout(1,1));
  
  panelbutton.add(jbtSave = new JButton("Save"));
  jbtSave.addActionListener (
     new ActionListener() {
      public void actionPerformed (ActionEvent en) {
       savefile();
      }
     }
     );
         
  textarea1 = new JTextArea(18,63);
        textarea1.setFont(new Font("monospaced",Font.PLAIN,12));
        JScrollPane scrollPane1 = new JScrollPane(textarea1);
        Linenumber linenumber1 = new Linenumber ( textarea1 );
        scrollPane1.setRowHeaderView(linenumber1);
        paneltext.add(scrollPane1);
      
  panel1.add(panelbutton);
  panel1.add(panellabel);
  panel1.add(paneltext);
  
  container.add(panel1);
   
 } // end init
 
  public void actionPerformed(ActionEvent ae) {
  } // End action perform 
  
  public void itemStateChanged(ItemEvent ie) {
  } // End item state changed
  
public void savefile(){
         
    String filename = namefile.getText();
 String filecontent = textarea1.getText();
      
 try 
 {
 java.net.URL url = new java.net.URL(codeBase + servlet);
    java.net.URLConnection con = url.openConnection();
    
    con.setUseCaches(false);
    con.setDoOutput(true);
    con.setDoInput(true);
    
    ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
    
    DataOutputStream out = new DataOutputStream(byteOut);
    
    out.writeUTF(filename);
    out.writeUTF(filecontent);
    
    out.flush();
    
    byte buf[] = byteOut.toByteArray();
    
    con.setRequestProperty("Content-type", "application/octet-stream");
    
    con.setRequestProperty("Content-length", "" + buf.length);
    
    DataOutputStream dataOut = new DataOutputStream(con.getOutputStream());
    dataOut.write(buf);
    
    dataOut.flush();
    dataOut.close();
    }
    
    catch (IOException ioe)
    {
    }
           
   } // end savefile
  } // end class IdeaTool
   
  Can anyone please help me detect the error of the codes? Maybe there is logic 
error in passing variables from applet to servlet? Please help me! Thank you so 
much.
   
  Yours Sincerely,
  TEH NORANIS

 
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