How to use

getOutputStream

method

in

org.apache.tomcat.util.http.fileupload.disk.DiskFileItem

/**
 * Reads the state of this object during deserialization.
 *
 * @param in The stream from which the state should be read.
 *
 * @throws IOException if an error occurs.
 * @throws ClassNotFoundException if class cannot be found.
 */
private void readObject(ObjectInputStream in)
    throws IOException, ClassNotFoundException {
  // read values
  in.defaultReadObject();
  OutputStream output = getOutputStream();
  if (cachedContent != null) {
    output.write(cachedContent);
  } else {
    FileInputStream input = new FileInputStream(dfosFile);
    IOUtils.copy(input, output);
    dfosFile.delete();
    dfosFile = null;
  }
  output.close();
  cachedContent = null;
}

final File TEST_FILE = new File("D:/my_text.txt");
 //final DiskFileItem diskFileItem = new DiskFileItem("fileData", "text/plain", true, TEST_FILE.getName(), 100000000, TEST_FILE);
 try
 {
   DiskFileItem fileItem = (DiskFileItem) new DiskFileItemFactory().createItem("fileData", "text/plain", true, TEST_FILE.getName());
   InputStream input =  new FileInputStream(TEST_FILE);
   OutputStream os = fileItem.getOutputStream();
   int ret = input.read();
   while ( ret != -1 )
   {
     os.write(ret);
     ret = input.read();
   }
   os.flush();
   System.out.println("diskFileItem.getString() = " + fileItem.getString());
 }
 catch (Exception e)
 {
   // TODO Auto-generated catch block
   e.printStackTrace();
 }

/**
 * Reads the state of this object during deserialization.
 *
 * @param in The stream from which the state should be read.
 *
 * @throws IOException if an error occurs.
 * @throws ClassNotFoundException if class cannot be found.
 */
private void readObject(ObjectInputStream in)
    throws IOException, ClassNotFoundException {
  // read values
  in.defaultReadObject();
  OutputStream output = getOutputStream();
  if (cachedContent != null) {
    output.write(cachedContent);
  } else {
    FileInputStream input = new FileInputStream(dfosFile);
    IOUtils.copy(input, output);
    dfosFile.delete();
    dfosFile = null;
  }
  output.close();
  cachedContent = null;
}

/**
 * Reads the state of this object during deserialization.
 *
 * @param in The stream from which the state should be read.
 *
 * @throws IOException if an error occurs.
 * @throws ClassNotFoundException if class cannot be found.
 */
private void readObject(ObjectInputStream in)
    throws IOException, ClassNotFoundException {
  // read values
  in.defaultReadObject();
  OutputStream output = getOutputStream();
  if (cachedContent != null) {
    output.write(cachedContent);
  } else {
    FileInputStream input = new FileInputStream(dfosFile);
    IOUtils.copy(input, output);
    dfosFile.delete();
    dfosFile = null;
  }
  output.close();
  cachedContent = null;
}