Writing local files from applet

Hi, I want to write an image file from an applet (appletviewer) to the local file system. Does anyone have any idea how I can do it? I tried using the FilePermission class but failed in doing so.
Thanx for any help in advance

I need to do this too.
Specifically I need to allow the user of an applet to write (text) files to his own local file system.
The applet displays graphical material to the user and I want the user to be able to type in comments to a text box which are then recorded by the applet - and ideally can be retrieved and used by the applet on subsequent occasions - as well as, of course, being available to the user via other programs.
Presumably I need to use a signed applet.
I want this to be as simple as possible so that the user (who will be unsophisticated) can be on Mac, Windows, Unix, Linux etc.
Anyone know a good reference text or tutorial?
(I am currently working with JAVA 2 fourth ed by Herbert Schildt)
HRT

Similar Messages

How to read a local file from Applet Code

Hi
I am developing a application and i want to access a local file from the applet
So pls help me in coding for this

You can't do that, at least not with an unsigned applet.
Sign your applet and it should work just like normal file access.

Writing Image files from Applet to Servlet

How to write ImageFiles from an Applet to a Servlet?
I draw a image on a JComponent in Applet and wanted to save the image file in the server.
I am unable to write an Image Object to the Servlet as the BufferedImage class is not serialized.
I tried writing the image to the Servlet output stream and tried reading the data in the servlet and writing the data to a jpg file.
But the files is not being written as proper jpeg file.
Any help would be great.
Thanks,
Sridhar.

I get the following exception below when i try to write a Serialized object from an applet to the servlet.
I copied the serialized class jar file to the tomcat webserver lib folder.
The serialized class has a BufferedImage object.
Serialized Class Code
public class SerializedImage implements Serializable{
     private BufferedImage im = null;
     public SerializedImage() {
          super();
     public BufferedImage getSerializedObject() {
          return im;
     public void setSerializedObject((BufferedImage im) {
          this.im = im;
     private BufferedImage fromByteArray(byte[] imagebytes) {
          try {
               if (imagebytes != null && (imagebytes.length > 0)) {
                    BufferedImage im = ImageIO.read(new ByteArrayInputStream(imagebytes));
                    return im;
               return null;
          } catch (IOException e) {
               throw new IllegalArgumentException(e.toString());
     private byte[] toByteArray(BufferedImage o) {
          if(o != null) {
               BufferedImage image = (BufferedImage)o;
               ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
               try {
                    ImageIO.write(image, "jpg", baos);
               } catch (IOException e) {
                    throw new IllegalStateException(e.toString());
               byte[] b = baos.toByteArray();
               return b;
          return new byte[0];
     private void writeObject(java.io.ObjectOutputStream out)
     throws IOException {
          byte[] b = toByteArray(im);
          out.writeInt(b.length);
          out.write(b);
     private void readObject(java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException {
          int length = in.readInt();
          byte[] b = new byte[length];
          in.read(b);
          im = fromByteArray(b);
Exception :
java.io.StreamCorruptedException: unexpected block data
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1288)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:18
45)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
Is there any thing that i am missing or doing wrong?
Thanks,
Sridhar.

Open html file from Applet

Hi,
I need to open html file from applet, the html file is placed in my local system, it is not open. the code is below, please can u tell where i did wrong.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
<applet code="Resource.class" width="400" height="400"></applet>
public class Resource extends Applet implements ActionListener
Button b = null;
public void init(){
b= new Button("Click");
add(b);
b.addActionListener(this);
public void actionPerformed(ActionEvent ae){
try
URL adress = new URL(getDocumentBase(), "html_code.htm");
getAppletContext().showDocument(adress, "_blank");
System.out.println("Execut inside"+adress);
}catch(MalformedURLException e){
System.out.println("Eror in Display");
}

Don't cross post
http://forum.java.sun.com/thread.jspa?threadID=633500

Open a Local file from JSP

Hi All,
I want to access a local file from a JSP. On click of the link the local file should open. The location of the local file is
O:/VWS00000000000000000001/REPORT_FRAGMENTS/Title1.doc
and the hyper link on the JSP shows
file:///O:/VWS00000000000000000001/REPORT_FRAGMENTS/Title1.doc
somehow the file does not open from the JSP page but it opens from the browser if I type
'file:///O:/VWS00000000000000000001/REPORT_FRAGMENTS/Title1.doc' in the address bar.
Can anybody please help.
regards,
Shardul.

if you'd like to show the real path to the user, use simply an ftp server !
however, if you prefer a secure solution, so use a servlet:
example:
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SendWord extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    //get the 'file' parameter
    String fileName = (String) request.getParameter("file");
    if (fileName == null || fileName.equals(""))
      throw new ServletException(
          "Invalid or non-existent file parameter in SendWord servlet.");
    // add the .doc suffix if it doesn't already exist
    if (fileName.indexOf(".doc") == -1)
      fileName = fileName + ".doc";
    String wordDir = getServletContext().getInitParameter("word-dir");
    if (wordDir == null || wordDir.equals(""))
      throw new ServletException(
          "Invalid or non-existent wordDir context-param.");
    ServletOutputStream stream = null;
    BufferedInputStream buf = null;
    try {
      stream = response.getOutputStream();
      File doc = new File(wordDir + "/" + fileName);
      response.setContentType("application/msword");
      response.addHeader("Content-Disposition", "attachment; filename="
          + fileName);
      response.setContentLength((int) doc.length());
      FileInputStream input = new FileInputStream(doc);
      buf = new BufferedInputStream(input);
      int readBytes = 0;
      while ((readBytes = buf.read()) != -1)
        stream.write(readBytes);
    } catch (IOException ioe) {
      throw new ServletException(ioe.getMessage());
    } finally {
      if (stream != null)
        stream.close();
      if (buf != null)
        buf.close();
public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    doGet(request, response);
}hope that helps

Playing an audio file from applet

Hi friends,
I have a problem to be solved .
Please help me.
I have to play an audio file from applet.When the applet loads it shold start playing .There is a progress bar in the applet it shold alsomove corresponding to that.
How can i do that.Give me an idea.
I know nothing about jmf.
I am using j2sdk1.4,windows 2000 server.

Andrew,
Forgive my naivety, but i struggle with JAVA! I am desperately trying to create a JAVA plugin to SERVOY and have to date been successful with a few things. Record, Playback, convert to .spx.
I am really struggling with implementing a rewind and fastforward function of the type you have. I thought it would be easy, but it appears not.
At the bottom is the complete code from my class that is called by the servoy plugin wrapper,
i had thought that adding some simple jump 500 ms would have been easy in something like this:
public AudioStream js_FastForward (AudioStream as) throws IOException {
!!! Line or two here to move the play head forward !!!
     AudioPlayer.player.start(as);
     return as;
Can you give me any pointers to how i code that fast forward bit.
many thanks
David
package com.d2e.MyPlugin;
import com.servoy.j2db.scripting.IScriptObject;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.Button;
import javax.sound.sampled.*;
import org.xiph.speex.*;
import org.xiph.speex.spi.*;
import sun.audio.*;    //import the sun.audio package
public class MyPluginProvider implements IScriptObject {
      public void JSencode()
         throws IOException{
           /** Version of the Speex Encoder */
            final String VERSION = "Java Speex Command Line Encoder v0.9.7 ($Revision: 1.5 $)";
            /** Copyright display String */
            final String COPYRIGHT = "Copyright (C) 2002-2004 Wimba S.A.";
            /** Print level for messages : Print debug information */
            final int DEBUG = 0;
            /** Print level for messages : Print basic information */
            final int INFO = 1;
            /** Print level for messages : Print only warnings and errors */
            final int WARN = 2;
            /** Print level for messages : Print only errors */
            final int ERROR = 3;
            int printlevel = INFO;
            /** File format for input or output audio file: Raw */
            final int FILE_FORMAT_RAW = 0;
            /** File format for input or output audio file: Ogg */
            final int FILE_FORMAT_OGG = 1;
            /** File format for input or output audio file: Wave */
            final int FILE_FORMAT_WAVE = 2;
            int srcFormat = FILE_FORMAT_OGG;
            int destFormat = FILE_FORMAT_WAVE;
            int mode       = -1;
            int quality    = 4;
            /** Defines the encoders algorithmic complexity. */
             int complexity = 3;
            /** Defines the number of frames per speex packet. */
             int nframes    = 1;
            /** Defines the desired bitrate for the encoded audio. */
             int bitrate    = -1;
            /** Defines the sampling rate of the audio input. */
             int sampleRate = -1;
            /** Defines the number of channels of the audio input (1=mono, 2=stereo). */
             int channels   = 1;
            /** Defines the encoder VBR quality setting (float from 0 to 10). */
             float vbr_quality = -1;
            /** Defines whether or not to use VBR (Variable Bit Rate). */
             boolean vbr    = false;
            /** Defines whether or not to use VAD (Voice Activity Detection). */
             boolean vad    = false;
            /** Defines whether or not to use DTX (Discontinuous Transmission). */
             boolean dtx    = false;
          //HArd code src format and dest
           // private String srcPath ="junk.wav";
          srcFormat = FILE_FORMAT_WAVE;
          destFormat = FILE_FORMAT_OGG;
          //destPath="junk.spx";
         byte[] temp    = new byte[2560]; // stereo UWB requires one to read 2560b
         final int HEADERSIZE = 8;
         final String RIFF      = "RIFF";
         final String WAVE      = "WAVE";
         final String FORMAT    = "fmt ";
         final String DATA      = "data";
         final int WAVE_FORMAT_PCM = 0x0001;
         // Open the input stream
         DataInputStream dis = new DataInputStream(new FileInputStream("junk.wav"));
         // Prepare input stream
       //DP - Sort out the Wave File
           // read the WAVE header
           dis.readFully(temp, 0, HEADERSIZE+4);
           // Read other header chunks
           dis.readFully(temp, 0, HEADERSIZE);
           String chunk = new String(temp, 0, 4);
           int size = readInt(temp, 4);
           while (!chunk.equals(DATA)) {
             dis.readFully(temp, 0, size);
             if (chunk.equals(FORMAT)) {
               typedef struct waveformat_extended_tag {
               WORD wFormatTag; // format type
               WORD nChannels; // number of channels (i.e. mono, stereo...)
               DWORD nSamplesPerSec; // sample rate
               DWORD nAvgBytesPerSec; // for buffer estimation
               WORD nBlockAlign; // block size of data
               WORD wBitsPerSample; // Number of bits per sample of mono data
               WORD cbSize; // The count in bytes of the extra size
               } WAVEFORMATEX;
               if (readShort(temp, 0) != WAVE_FORMAT_PCM) {
                 System.err.println("Not a PCM file");
                 return;
               channels = readShort(temp, 2);
               sampleRate = readInt(temp, 4);
               if (readShort(temp, 14) != 16) {
                 System.err.println("Not a 16 bit file " + readShort(temp, 18));
                 return;
               // Display audio info
               if (printlevel <= DEBUG) {
                 System.out.println("File Format: PCM wave");
                 System.out.println("Sample Rate: " + sampleRate);
                 System.out.println("Channels: " + channels);
             dis.readFully(temp, 0, HEADERSIZE);
             chunk = new String(temp, 0, 4);
             size = readInt(temp, 4);
           if (printlevel <= DEBUG) System.out.println("Data size: " + size);
       //DP ENd sort wave file
       //Now Choose the mode , we have a file sampled at 44100
             mode = 2; // Ultra-wideband
         // Construct a new encoder
         SpeexEncoder speexEncoder = new SpeexEncoder();
         speexEncoder.init(mode, quality, sampleRate, channels);
         if (complexity > 0) {
           speexEncoder.getEncoder().setComplexity(complexity);
         if (bitrate > 0) {
           speexEncoder.getEncoder().setBitRate(bitrate);
         if (vbr) {
           speexEncoder.getEncoder().setVbr(vbr);
           if (vbr_quality > 0) {
             speexEncoder.getEncoder().setVbrQuality(vbr_quality);
         if (vad) {
           speexEncoder.getEncoder().setVad(vad);
         if (dtx) {
           speexEncoder.getEncoder().setDtx(dtx);
         // Display info
         // Open the file writer
         AudioFileWriter writer;
         if (destFormat == FILE_FORMAT_OGG) {
           writer = new OggSpeexWriter(mode, sampleRate, channels, nframes, vbr);
         else if (destFormat == FILE_FORMAT_WAVE) {
           nframes = PcmWaveWriter.WAVE_FRAME_SIZES[mode-1][channels-1][quality];
           writer = new PcmWaveWriter(mode, quality, sampleRate, channels, nframes, vbr);
         else {
           writer = new RawWriter();
         writer.open("junk.spx");
         writer.writeHeader("Encoded with: " + VERSION);
         int pcmPacketSize = 2 * channels * speexEncoder.getFrameSize();
         try {
           // read until we get to EOF
           while (true) {
             dis.readFully(temp, 0, nframes*pcmPacketSize);
             for (int i=0; i<nframes; i++)
               speexEncoder.processData(temp, i*pcmPacketSize, pcmPacketSize);
             int encsize = speexEncoder.getProcessedData(temp, 0);
             if (encsize > 0) {
               writer.writePacket(temp, 0, encsize);
         catch (EOFException e) {}
         writer.close();
         dis.close();
        * Converts Little Endian (Windows) bytes to an int (Java uses Big Endian).
        * @param data the data to read.
        * @param offset the offset from which to start reading.
        * @return the integer value of the reassembled bytes.
       protected static int readInt(final byte[] data, final int offset)
         return (data[offset] & 0xff) |
                ((data[offset+1] & 0xff) << 8) |
                ((data[offset+2] & 0xff) << 16) |
                (data[offset+3] << 24); // no 0xff on the last one to keep the sign
        * Converts Little Endian (Windows) bytes to an short (Java uses Big Endian).
        * @param data the data to read.
        * @param offset the offset from which to start reading.
        * @return the integer value of the reassembled bytes.
       protected static int readShort(final byte[] data, final int offset)
         return (data[offset] & 0xff) |
                (data[offset+1] << 8); // no 0xff on the last one to keep the sign
     AudioFormat audioFormat;
       TargetDataLine targetDataLine;
     public Class[] getAllReturnedTypes() {
          // TODO Auto-generated method stub
          return null;
     public String[] getParameterNames(String arg0) {
          // TODO Auto-generated method stub
          return null;
     public String getSample(String arg0) {
          // TODO Auto-generated method stub
          return null;
     public String getToolTip(String arg0) {
          // TODO Auto-generated method stub
          return null;
     public boolean isDeprecated(String arg0) {
          // TODO Auto-generated method stub
          return false;
     public String js_Record (String name){
          captureAudio();
          return "Started Recording " +name;
    public String js_StopRecord (String name) throws IOException{
         //new ActionListener(){
         //   public void actionPerformed(ActionEvent e)
              //Terminate the capturing of input data
              // from the microphone.
              targetDataLine.stop();
              targetDataLine.close();
          // }//end actionPerformed
         //};//end ActionListener
             // JSpeexEnc ("junk.wav","output.spx");
              JSencode();
          return "Stop Records " +name;
    //Play audio file
    public AudioStream js_Playback (String name) throws IOException{
         InputStream in = new FileInputStream("junk.wav");
         AudioStream as = new AudioStream(in);
         AudioPlayer.player.start(as);
         return as;
    public AudioStream js_ContPlay (AudioStream as) throws IOException {
         AudioPlayer.player.start(as);
         return as;
     //Stop Play
    public AudioStream js_Stop_Playback (AudioStream as) throws IOException{
         AudioPlayer.player.stop(as);
          return as;
     //This method captures audio input from a
    // microphone and saves it in an audio file.
    private void captureAudio(){
      try{
        //Get things set up for capture
        audioFormat = getAudioFormat();
        DataLine.Info dataLineInfo =
                            new DataLine.Info(
                              TargetDataLine.class,
                              audioFormat);
        targetDataLine = (TargetDataLine)
                 AudioSystem.getLine(dataLineInfo);
        //Create a thread to capture the microphone
        // data into an audio file and start the
        // thread running. It will run until the
        // Stop button is clicked. This method
        // will return after starting the thread.
        new CaptureThread().start();
      }catch (Exception e) {
        e.printStackTrace();
        System.exit(0);
      }//end catch
    }//end captureAudio method
// This method creates and returns an
    // AudioFormat object for a given set of format
    // parameters. If these parameters don't work
    // well for you, try some of the other
    // allowable parameter values, which are shown
    // in comments following the declarations.
    private AudioFormat getAudioFormat(){
      float sampleRate = 44100.0F;
      //8000,11025,16000,22050,44100
      int sampleSizeInBits = 16;
      //8,16
      int channels = 1;
      //1,2
      boolean signed = true;
      //true,false
      boolean bigEndian = true;
      //true,false
      return new AudioFormat(sampleRate,
                             sampleSizeInBits,
                             channels,
                             signed,
                             bigEndian);
    }//end getAudioFormat
    class CaptureThread extends Thread{
           public void run(){
             AudioFileFormat.Type fileType = null;
             File audioFile = null;
             //Set the file type and the file extension
             // based on the selected radio button.
             //if(aifcBtn.isSelected()){
              // fileType = AudioFileFormat.Type.AIFC;
              // audioFile = new File("junk.aifc");
            // }else if(aiffBtn.isSelected()){
             // fileType = AudioFileFormat.Type.AIFF;
             // audioFile = new File("junk.aif");
            // }else if(auBtn.isSelected()){
             // fileType = AudioFileFormat.Type.AU;
             // audioFile = new File("junk.au");
            // }else if(sndBtn.isSelected()){
            //   fileType = AudioFileFormat.Type.SND;
             // audioFile = new File("junk.snd");
            // }else if(waveBtn.isSelected()){
             fileType = AudioFileFormat.Type.WAVE;
             audioFile = new File("junk.wav");
            // }//end if
             try{
               targetDataLine.open(audioFormat);
               targetDataLine.start();
               AudioSystem.write(
                     new AudioInputStream(targetDataLine),
                     fileType,
                     audioFile);
             }catch (Exception e){
               e.printStackTrace();
             }//end catch
           }//end run
         }//end inner class CaptureThread
}

Open a local file from a web Service

Hello!
Likely this is a trivial question, but I need to open a local file from a Web Service and i don't know how to get the file path. I mean that I have a WS source code placed in a proper package (my.ws.package) with an additional configuration XML file placed in the same directory. I need to read it, but if I use merely
File conf = new File("Conf.xml");it can't find it. I've tryed with:
MyWS.class.getClass().getProtectionDomain().getCodeSource().getLocation().getPath()in order to get the file path, but a
java.security.AccessControlException access denied (java.lang.RuntimePermission getProtectionDomain)arises...
I don't know...
Suggestions?
Thanks.
Anhur

Hello!
Likely this is a trivial question, but I need to open a local file from a Web Service and i don't know how to get the file path. I mean that I have a WS source code placed in a proper package (my.ws.package) with an additional configuration XML file placed in the same directory. I need to read it, but if I use merely
File conf = new File("Conf.xml");it can't find it. I've tryed with:
MyWS.class.getClass().getProtectionDomain().getCodeSource().getLocation().getPath()in order to get the file path, but a
java.security.AccessControlException access denied (java.lang.RuntimePermission getProtectionDomain)arises...
I don't know...
Suggestions?
Thanks.
Anhur

Writing binary data to ASP file from applet through URLConnection

Hi Everybody,
I am facing a proble with HttpURLConnection.I want to write some binary data from applet to an ASP file.The other end ASP file read this binary data and process , Here problem is I have opened URLConnection to the page and Created OutputStream and writing byte by Write() method But other end we are not getting bytes...we are not getting error too at java side..can any body help me..do we need to set any property to URLConnection...here I am giving sample code...
OutputStream os;
URL uConnect2;
HttpURLConnection hucConnect2;
uConnect2= new URL("http://webserver/vnc/sendtoserver.asp?"); hucConnect2=(HttpURLConnection)uConnect2.openConnection();
hucConnect2.setDoOutput(true);
hucConnect2.setRequestMethod("POST")
os=new DataOutputStream(hucConnect2.getOutputStream());
os.writeBytes("Hello");
Thanks in Advance
Madhav

Do you remember to flush() and close() the stream?

How to open a local file from javascript in a jsp-page

Hi
I have created an iview from a PAR file. In the par file I have a jsp-page with some javascript code. From the javascript coe I want to open a new window with an Excel file.
I have tried window.open("c:
test.xls", "test_window"), but it doesn't seem to work. I have created a small HTML page locally with the same command and there a new window opens with the Excel file.
If I change the local file path with an URL it also works.
Any idea how to open a local file ?
Thanks
/Jakob

Jacob,
I'm not 100% (but 99,9%) and it has to do with security ristrictions of the browser not allowing to have local workstation interation from the web. This is ofcourse very dangerous if the browser would allow it... So therfore it is blocked. What if somone would point to a file/executable that formats your drive so for that reason it is not allowed to have web interaction with a local file. Only with Java Applets this is possible but still with many limitations, and what I remember Google Gears and Adobe Air do have some limited web 2 local file interaction... So best and most simple solution you are left with is pointing to a url instead of a file on a c:\ drive.
PS The reason why it works when you start the html from your local PC has todo with the fact that the browser detects that the html is not running in the web at that moment therefor allowing the access.
Cheers,
Benjamin Houttuin

How to call a .jsp file from Applet

Could any one guide me how to call a .jsp file from a Applet using action Event.
Thanks

http://javaalmanac.com/cgi-bin/search/find.pl?words=URL+post

Sending a file from Applet to servlet HELP me Please

Sorry, i have the problem this is my code Applet & Servlet but it seems working asynchronously if you have some ideas please reply me i send bytes on outputstream but the inputstream of servlet receive nothing bytes but write my system.out.print on screen server:
Applet:
URL servletURL = new URL(codebase, "/InviaFile/servlet/Ricevi");
HttpURLConnection urlConnection = (HttpURLConnection) servletURL.openConnection();
urlConnection.setRequestMethod("POST");
urlConnection.setUseCaches(false);
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setAllowUserInteraction(false);
urlConnection.setRequestProperty("Content-Type", "application/octet-stream");
urlConnection.setRequestProperty("Content-length", String.valueOf(100));
urlConnection.connect();
if(urlConnection.HTTP_BAD_REQUEST == HttpURLConnection.HTTP_BAD_REQUEST){
/*System.out.println("Cattiva Richiesta: "+urlConnection.getContentEncoding());
System.out.println("Tipo di metodo: "+urlConnection.getRequestMethod());
System.out.println("Tipo di Risposta: "+urlConnection.getResponseCode());
System.out.println("Tipo di messaggio: "+urlConnection.getResponseMessage());
System.out.println("Tipo di contenuto: "+urlConnection.getContentType());
System.out.println("Tipo di lunghezza contenuto: "+urlConnection.getContentLength());
System.out.println("Tipo di doinput: "+urlConnection.getDoInput());
System.out.println("Tipo di doouput: "+urlConnection.getDoOutput());
System.out.println("Tipo di URL: "+urlConnection.getURL());
System.out.println("Tipo di propriet� richiesta: "+urlConnection.getRequestProperty("Content-Type"));
System.out.println("Entra if");
DataOutputStream dout = new DataOutputStream(urlConnection.getOutputStream());
InputStream is = urlConnection.getInputStream();
if(ritornaFile("C:/Ms.tif", dout))System.out.println("Finita lettura");
dout.close();
urlConnection.disconnect();
System.out.println("Fine Applet");
}catch(Exception e) { System.err.println(e.getMessage());e.printStackTrace();}
public boolean ritornaFile(String file, OutputStream ots)throws Exception{
FileInputStream f = null;
try{
f = new FileInputStream(file);
byte[] buf = new byte[4 * 1024];
int byteLetti;
while((byteLetti = f.read()) != -1){ots.writeByte(buf, 0, byteLetti);ots.flush();
while((byteLetti = f.read()) != -1){ots.write(byteLetti);ots.flush();
System.out.println("byteLetti= "+byteLetti);
return true;
}catch(Exception ex){
System.err.println(ex.getMessage());
return false;
}finally{
if(f != null)f.close();
Servlet:
HttpSession ses = request.getSession(true);
System.out.println("Passa servlet "+request.getMethod());
System.out.println("Passa servlet "+ses.getId());
ServletInputStream servletinputstream = request.getInputStream();
DataInputStream dis = new DataInputStream(request.getInputStream());
int c = dis.available();
System.out.println("c="+c);
//ServletOutputStream servletoutputstream
//response.getOutputStream();
response.setContentType("application/octet-stream");
System.out.println("URI= "+request.getRequestURI());
System.out.println("pathTranslated: "+request.getPathTranslated());
System.out.println("RemoteUser: "+request.getRemoteUser());
System.out.println("UserInRole: "+String.valueOf(request.isUserInRole("")));
System.out.println("pathInfo: "+request.getPathInfo());
System.out.println("Protocollo: "+request.getProtocol());
System.out.println("RemoteAddr:"+request.getRemoteAddr());
System.out.println("RemoteHost:"+request.getRemoteHost());
System.out.println("SessionID:"+request.getRequestedSessionId());
System.out.println("Schema:"+request.getScheme());
System.out.println("SeesionValido:"+String.valueOf(request.isRequestedSessionIdValid()));
System.out.println("FromURL:"+String.valueOf(request.isRequestedSessionIdFromURL()));
int i = request.getContentLength();
System.out.println("i: "+i);
ritornaFile(servletinputstream, "C:"+File.separator+"Pluto.tif");
System.out.println("GetMimeType= "+getServletContext().getMimeType("Ms.tif"));
InputStream is = request.getInputStream();
int in = is.available();
System.out.println("Legge dallo stream in="+in);
DataInputStream diss = new DataInputStream(servletinputstream);
int ins = diss.read();
System.out.println("Legge dallo stream ins="+ins);
int disins = diss.available();
System.out.println("Legge dallo stream disins="+disins);
is.close();
System.out.println("Fine Servlet");
catch(Exception exception) {
System.out.println("IOException occured in the Server: " + exception.getMessage());exception.printStackTrace();
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
processRequest(request, response);
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
processRequest(request, response);
/** Returns a short description of the servlet.
public String getServletInfo() {
return "Short description";
public void ritornaFile(InputStream its, String fileDest )throws Exception{
FileOutputStream f = null;
try{
f = new FileOutputStream(fileDest);
byte[] buf = new byte[2 * 1024];
int byteLetti;
while((byteLetti = its.read()) != -1){
f.write(buf, 0, byteLetti);
f.flush();
System.out.println("Byteletti="+byteLetti);
}catch(Exception ex){
System.err.println(ex.getMessage());
}finally{
if(f != null)f.close();

Hi all,
Can anyone help me.I am trying to send an audio file from a applet to servlet with HTTP method(no raw sockets), also the servlet shld be able to save the file on the server.Any suggestions welcome.USing audiostream class from javax.sound.sampled.
The part of applet code which calls servlet is :
URL url = new URL("http://" + host + "/" + context + "/servlet/UserUpdateWorkLogAudio?userid=" + userId.replace(' ', '+') + "&FileName=" + filename.replace(' ', '+'));
URLConnection myConnection = url.openConnection();
myConnection.setUseCaches(false);
myConnection.setDoOutput(true);
urlConnection.setRequestProperty("Content-Type", "application/octet-stream");
myConnection.connect();
out = new BufferedOutputStream(myConnection.getOutputStream());
AudioSystem.write(audioInputStream, fileType,out); // IS THIS RIGHT APPROACH?
************************end of applet code**********************
************************servlet code******************************
try
{BufferedInputStream in = new BufferedInputStream(request.getInputStream());
????????What code shld i write here to get the audio file stream
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(filename));
*********************************************end***********************
Thanks
Joe.

Uploading large files from applet to servlet throws out of memory error

I have a java applet that needs to upload files from a client machine
to a web server using a servlet. the problem i am having is that in
the current scheme, files larger than 17-20MB throw an out of memory
error. is there any way we can get around this problem? i will post
the client and server side code for reference.
Client Side Code:
import java.io.*;
import java.net.*;
// this class is a client that enables transfer of files from client
// to server. This client connects to a servlet running on the server
// and transmits the file.
public class fileTransferClient
private static final String FILENAME_HEADER = "fileName";
private static final String FILELASTMOD_HEADER = "fileLastMod";
// this method transfers the prescribed file to the server.
// if the destination directory is "", it transfers the file to
"d:\\".
//11-21-02 Changes : This method now has a new parameter that
references the item
//that is being transferred in the import list.
public static String transferFile(String srcFileName, String
destFileName,
String destDir, int itemID)
if (destDir.equals(""))
destDir = "E:\\FTP\\incoming\\";
// get the fully qualified filename and the mere filename.
String fqfn = srcFileName;
String fname =
fqfn.substring(fqfn.lastIndexOf(File.separator)+1);
try
//importTable importer = jbInit.getImportTable();
// create the file to be uploaded and a connection to
servlet.
File fileToUpload = new File(fqfn);
long fileSize = fileToUpload.length();
// get last mod of this file.
// The last mod is sent to the servlet as a header.
long lastMod = fileToUpload.lastModified();
String strLastMod = String.valueOf(lastMod);
URL serverURL = new URL(webadminApplet.strServletURL);
URLConnection serverCon = serverURL.openConnection();
// a bunch of connection setup related things.
serverCon.setDoInput(true);
serverCon.setDoOutput(true);
// Don't use a cached version of URL connection.
serverCon.setUseCaches (false);
serverCon.setDefaultUseCaches (false);
// set headers and their values.
serverCon.setRequestProperty("Content-Type",
"application/octet-stream");
serverCon.setRequestProperty("Content-Length",
Long.toString(fileToUpload.length()));
serverCon.setRequestProperty(FILENAME_HEADER, destDir +
destFileName);
serverCon.setRequestProperty(FILELASTMOD_HEADER, strLastMod);
if (webadminApplet.DEBUG) System.out.println("Connection with
FTP server established");
// create file stream and write stream to write file data.
FileInputStream fis = new FileInputStream(fileToUpload);
OutputStream os = serverCon.getOutputStream();
try
// transfer the file in 4K chunks.
byte[] buffer = new byte[4096];
long byteCnt = 0;
//long percent = 0;
int newPercent = 0;
int oldPercent = 0;
while (true)
int bytes = fis.read(buffer);
byteCnt += bytes;
//11-21-02 :
//If itemID is greater than -1 this is an import file
transfer
//otherwise this is a header graphic file transfer.
if (itemID > -1)
newPercent = (int) ((double) byteCnt/ (double)
fileSize * 100.0);
int diff = newPercent - oldPercent;
if (newPercent == 0 || diff >= 20)
oldPercent = newPercent;
jbInit.getImportTable().displayFileTransferStatus
(itemID,
newPercent);
if (bytes < 0) break;
os.write(buffer, 0, bytes);
os.flush();
if (webadminApplet.DEBUG) System.out.println("No of bytes
sent: " + byteCnt);
finally
// close related streams.
os.close();
fis.close();
if (webadminApplet.DEBUG) System.out.println("File
Transmission complete");
// find out what the servlet has got to say in response.
BufferedReader reader = new BufferedReader(
new
InputStreamReader(serverCon.getInputStream()));
try
String line;
while ((line = reader.readLine()) != null)
if (webadminApplet.DEBUG) System.out.println(line);
finally
// close the reader stream from servlet.
reader.close();
} // end of the big try block.
catch (Exception e)
System.out.println("Exception during file transfer:\n" + e);
e.printStackTrace();
return("FTP failed. See Java Console for Errors.");
} // end of catch block.
return("File: " + fname + " successfully transferred.");
} // end of method transferFile().
} // end of class fileTransferClient
Server side code:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.net.*;
// This servlet class acts as an FTP server to enable transfer of
files
// from client side.
public class FtpServerServlet extends HttpServlet
String ftpDir = "D:\\pub\\FTP\\";
private static final String FILENAME_HEADER = "fileName";
private static final String FILELASTMOD_HEADER = "fileLastMod";
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,
IOException
doPost(req, resp);
public void doPost(HttpServletRequest req, HttpServletResponse
resp)
throws ServletException,
IOException
// ### for now enable overwrite by default.
boolean overwrite = true;
// get the fileName for this transmission.
String fileName = req.getHeader(FILENAME_HEADER);
// also get the last mod of this file.
String strLastMod = req.getHeader(FILELASTMOD_HEADER);
String message = "Filename: " + fileName + " saved
successfully.";
int status = HttpServletResponse.SC_OK;
System.out.println("fileName from client: " + fileName);
// if filename is not specified, complain.
if (fileName == null)
message = "Filename not specified";
status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
else
// open the file stream for the file about to be transferred.
File uploadedFile = new File(fileName);
// check if file already exists - and overwrite if necessary.
if (uploadedFile.exists())
if (overwrite)
// delete the file.
uploadedFile.delete();
// ensure the directory is writable - and a new file may be
created.
if (!uploadedFile.createNewFile())
message = "Unable to create file on server. FTP failed.";
status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
else
// get the necessary streams for file creation.
FileOutputStream fos = new FileOutputStream(uploadedFile);
InputStream is = req.getInputStream();
try
// create a buffer. 4K!
byte[] buffer = new byte[4096];
// read from input stream and write to file stream.
int byteCnt = 0;
while (true)
int bytes = is.read(buffer);
if (bytes < 0) break;
byteCnt += bytes;
// System.out.println(buffer);
fos.write(buffer, 0, bytes);
// flush the stream.
fos.flush();
} // end of try block.
finally
is.close();
fos.close();
// set last mod date for this file.
uploadedFile.setLastModified((new
Long(strLastMod)).longValue());
} // end of finally block.
} // end - the new file may be created on server.
} // end - we have a valid filename.
// set response headers.
resp.setContentType("text/plain");
resp.setStatus(status);
if (status != HttpServletResponse.SC_OK)
getServletContext().log("ERROR: " + message);
// get output stream.
PrintWriter out = resp.getWriter();
out.println(message);
} // end of doPost().
} // end of class FtpServerServlet

OK - the problem you describe is definitely what's giving you grief.
The workaround is to use a socket connection and send your own request headers, with the content length filled in. You may have to multi-part mime encode the stream on its way out as well (I'm not about that...).
You can use the following:
http://porsche.cis.udel.edu:8080/cis479/lectures/slides-04/slide-02.html
on your server to get a feel for the format that the request headers need to take.
- Kevin
I get the out of Memory Error on the client side. I
was told that this might be a bug in the URLConnection
class implementation that basically it wont know the
content length until all the data has been written to
the output stream, so it uses an in memory buffer to
store the data which basically causes memory issues..
do you think there might be a workaround of any kind..
or maybe a way that the buffer might be flushed after
a certain size of file has been uploaded.. ?? do you
have any ideas?

Download internal table value to local file from BSP

Dear all
I ve converted a word file to XML and doing some modifications with the help of ABAP program .After that am replacing some of the fields by passing values.after that i am getting the same file to the local system.All these i am able to do in our SAP GUI.
But while trying in BSP am uanle to download it to the local file.
I am having file which i have to download in the following formats.
1.XSTRING
2.ITAB
3.Rawstring ITAB
Now am trying this with cl_bsp_utility->download class.....please anybody help how to use this in my application.
regards
mei

Hi,
You can't directly access the file system of the end user from a BSP.
Either you create a link on your web page, either you set the mime type of the response with runtime->server->response->set_header_field( name = 'Content-Type' value = 'some mime type' ) in order to let the end user save the file.
Eddy

How to retrieve a local file from a portal report.

Hi,
I need to access a local htm file from my local directory. I stored the filename in
a table. And I built a portal report to select the filename from the table. The filename
in the report will be link to a procedure that I created to pass the filename. The
procedure code is as follow:
(v_filename in varchar2) IS
url varchar2(100);
BEGIN
url := 'uploaddoc/'| |v_filename;
portal30.wwv_redirect.url(p_url =>url);
END;
Then in the httpd.conf file, I put in an alias like this:
I put an alias in the httpd.conf file like this:
Alias /uploaddoc/ "C:\My_Data\uploaddoc/"
I stopped the http server and restarted it after I made the changes.
When I run the report, I click on the filename link: in my example,it is:
internal_portal_faq, the filename is passed to the procedure that I created.
But I got the following error message on the browser:
No DAD configuration Found
DAD name:
PROCEDURE : internal_portal_faq
URL : http://localhost:80/pls/portal30/uploaddoc/internal_portal_faq
I am running on version 3.07 on NT on my laptop.
Any idea what I did wrong?
P.S. I don't want to upload the file using a portal form into the blob field.
Thanks;
Kelly.
null

Hi,
I found out a way to do this myself. If anyone is interested in that, just drop me an email.
Kelly.
null

How to print a local file from jsp

Hi,
I want to print a local file(eg. .doc,.pdf) from a jsp.
Please help me with any answer or any example code
Thanks in advance
Regards,
Sanjeev

Try this:
index1.jsp:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<Link rel='alternate' media='print' href=null>
<script Language=JavaScript>
function setPrintPage(prnThis){
prnDoc = document.getElementsByTagName('Link');
prnDoc[0].setAttribute('href', prnThis);
window.print();
</script>
</head>
<body >
<a href="#" onclick="setPrintPage('index.jsp');"> Click to Print </a>
</html>This will print index.jsp without opening it in browser. Hope this helps!

Writing local files from applet

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