Good tutorial for using the orielly file upload servlet

Hello all,
I just downloaded the packages from the orielly site and I am interested in using the upload servlet. I have the oreilly servlet book but it doesnt get into much detail about how to use the servlet. I have not used servlets before so I need basic advice or a tutorial on using the MultipartRequest servlet. Where can I find this? I checked servlets.com's FAQ but it doesnt have much about how to set it up.
TIA!

Thanks but I want to try to use the orielly servlet class I need some practice using servlets as I am relying on jsp's too much.
Anybody have any pointers on the orielly upload servlet and how to use it.

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Hi Jocelyn,
I want to apologize firstly for the delay in my response.
I was seriously bogged down due to certain circumstances and so couldnt reply.Thanks a million for your prompt reply.I'll post the Html content here and you will find the servlet code as is at the following U.R.L
http://www.java-edge.com/Viewcode.asp?Value=serv012
Form1:
<HTML>
<HEAD>
<TITLE> Upload </TITLE>
</HEAD>
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<h2>Upload Your File!</h2>
<form ENCTYPE="multipart/form-data" action="http://localhost:8080/servlet/Upload" method=post>
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Click here to upload!<input type=submit value=Upload>
<input type=hidden name=Directory value="G:/Workspace/Upload/">
<input type=hidden name=SuccessPage value="G:/Workspace/successpage.html">
<input type=hidden name="OverWrite" value="false">
<input type=hidden name="OverWritePage" value="">
</form>
</BODY>
</HTML>
Form 2
<HTML>
<HEAD>
<TITLE> Upload </TITLE>
</HEAD>
<BODY >
<h2>Upload Your File!</h2>
<form ENCTYPE="multipart/form-data" action="http://localhost:8080/servlet/Upload" method=post>
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<b> File:</b>
<input type="FILE" name="Filename" value="" MAXLENGTH=255 size=50><br>
Click here to upload!<input type=submit value=Upload>
<input type=hidden name=Directory value="G:/Workspace/Upload/">
<input type=hidden name=SuccessPage value="G:/Workspace/successpage.html">
<input type=hidden name="OverWrite" value="true">
<input type=hidden name="OverWritePage" value="G:/Workspace/overwritepage.html">
</form>
</BODY>
</HTML>
Now in Form 2 I would add another button which when clicked would prompt the user if he wishes to overwrite the page.
I am also posting the servlet code although I am sure u would prefer reading the one on the site
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Upload extends HttpServlet
static final int Max = 102400;// max. size of the file can be 100K
String path;// stores path
String msg;// store message of success
//init method is called when servlet is first loaded
public void init(ServletConfig config)throws ServletException
super.init(config);
if(path == null)
path = "G:/Workspace/Upload/";
if(msg == null)
msg = "File successfully uploaded. Check out!";
public void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException
ServletOutputStream sos = null;
DataInputStream dis = null;
FileOutputStream fos = null;
try
resp.setContentType("text/plain");// return type of response is being set as plain
sos = resp.getOutputStream();// gets handle to the output stream
catch(IOException e)
System.out.println(e);
return;
try
String contentType = req.getContentType();// gets client's content type that should be multipart/form-data
if(contentType!=null && contentType.indexOf("multipart/form-data")!= -1)
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     int totalData = 0;
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     String data = new String(arr);//byte array converted to String
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     int lastIndex = contentType.lastIndexOf("=");
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     return;
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     successPage =data.substring(data.indexOf("name=\"SuccessPage\""));
     // gets successpage
     String overWrite="";
     if(data.indexOf("name=\"OverWrite\"")>0)// the type ""Overwrite"" is searched in the web page
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     overWrite = overWrite.substring(overWrite.indexOf("\n")+1);
     overWrite = overWrite.substring(overWrite.indexOf("\n")+1);
     overWrite = overWrite.substring(0,overWrite.indexOf("\n")-1);//gets overwrite flag
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     //overWrite = "false";
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     overWritePage =data.substring(data.indexOf("name=\"OverWritePage\""));
     overWritePage = overWritePage.substring(overWritePage.indexOf("\n")+1);
     overWritePage = overWritePage.substring(overWritePage.indexOf("\n")+1);
     overWritePage = overWritePage.substring(0,overWritePage.indexOf("\n")-1);// // gets overwritepage
     //gets upload file name
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     file = file.substring(0,file.indexOf("\n"));
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     position =data.indexOf("\n",position)+1;//find position of blank line
     int location =data.indexOf(boundary,position)-4;//find position of next boundary marker
     data =data.substring(position,location);// uploaded file lies between position and location
     String fileName = new String(path + dir + file);// the complete path of uploadad file
     File check = new File(fileName);
/*************************CASE OVERRIDE ************************************/
     //String overwrite=req.getParameter("OverWrite");
     if(check.exists())// checks for existence of file
          if(overWrite.equals("false"))
                    if(overWritePage.equals(""))
                    sos.println("Sorry ,file already exists");
                    //return;
                    else
                    //overWritePage="G:/Workspace/overwritepage.html";
                    fos = new FileOutputStream(fileName);
                    fos.write(data.getBytes(),0,data.length());
                    //resp.sendRedirect(overWritePage);
                    sos.println("File Overridden");
          //return;
     File checkDir = new File(path + dir);
     if(!checkDir.exists())//checks for existence of directory
     checkDir.mkdirs();
fos = new FileOutputStream(fileName);
fos.write(data.getBytes(),0,data.length());
sos.println("File successfully uploaded");
if(check.exists())
          if(overWrite.equals("true"))
               fos = new FileOutputStream(fileName);
               fos.write(data.getBytes(),0,data.length());
               if(successPage.equals(""))
               sos.println(msg);
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     else// incase request is not multipart
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}//END OF TRY BLOCK
catch(Exception e)
          try
          System.out.println(e);
          sos.println("unexpected error");
          catch(Exception f)
          System.out.println(f);
finally
          try
          fos.close();// file output stream closed
          catch(Exception f)
          System.out.println(f);
          try
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          catch(Exception f)
          System.out.println(f);
          try
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          catch(Exception f)
          System.out.println(f);
}//END OF DOPOST METHOD
} //END OF CLASS
Jocelyn the above code may have tid bit errors which u could understand.But I hope u get the overall idea of whats going on

Good tutorial for using the orielly file upload servlet

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