How to use

getUniqueId

method

in

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

/**
 * Creates and returns a {@link java.io.File File} representing a uniquely
 * named temporary file in the configured repository path. The lifetime of
 * the file is tied to the lifetime of the <code>FileItem</code> instance;
 * the file will be deleted when the instance is garbage collected.
 *
 * @return The {@link java.io.File File} to be used for temporary storage.
 */
protected File getTempFile() {
  if (tempFile == null) {
    File tempDir = repository;
    if (tempDir == null) {
      tempDir = new File(System.getProperty("java.io.tmpdir"));
    }
    String tempFileName =
      "upload_" + UID + "_" + getUniqueId() + ".tmp";
    tempFile = new File(tempDir, tempFileName);
  }
  return tempFile;
}

/**
 * Creates and returns a {@link java.io.File File} representing a uniquely
 * named temporary file in the configured repository path. The lifetime of
 * the file is tied to the lifetime of the <code>FileItem</code> instance;
 * the file will be deleted when the instance is garbage collected.
 *
 * @return The {@link java.io.File File} to be used for temporary storage.
 */
protected File getTempFile() {
  if (tempFile == null) {
    File tempDir = repository;
    if (tempDir == null) {
      tempDir = new File(System.getProperty("java.io.tmpdir"));
    }
    String tempFileName =
        String.format("upload_%s_%s.tmp", UID, getUniqueId());
    tempFile = new File(tempDir, tempFileName);
  }
  return tempFile;
}

/**
 * Creates and returns a {@link java.io.File File} representing a uniquely
 * named temporary file in the configured repository path. The lifetime of
 * the file is tied to the lifetime of the <code>FileItem</code> instance;
 * the file will be deleted when the instance is garbage collected.
 *
 * @return The {@link java.io.File File} to be used for temporary storage.
 */
protected File getTempFile() {
  if (tempFile == null) {
    File tempDir = repository;
    if (tempDir == null) {
      tempDir = new File(System.getProperty("java.io.tmpdir"));
    }
    String tempFileName =
      "upload_" + UID + "_" + getUniqueId() + ".tmp";
    tempFile = new File(tempDir, tempFileName);
  }
  return tempFile;
}

/**
 * Creates and returns a {@link java.io.File File} representing a uniquely
 * named temporary file in the configured repository path. The lifetime of
 * the file is tied to the lifetime of the <code>FileItem</code> instance;
 * the file will be deleted when the instance is garbage collected.
 *
 * @return The {@link java.io.File File} to be used for temporary storage.
 */
protected File getTempFile() {
  if (tempFile == null) {
    File tempDir = repository;
    if (tempDir == null) {
      tempDir = new File(System.getProperty("java.io.tmpdir"));
    }
    String tempFileName =
      "upload_" + UID + "_" + getUniqueId() + ".tmp";
    tempFile = new File(tempDir, tempFileName);
  }
  return tempFile;
}

/**
 * Creates and returns a {@link java.io.File File} representing a uniquely
 * named temporary file in the configured repository path. The lifetime of
 * the file is tied to the lifetime of the <code>FileItem</code> instance;
 * the file will be deleted when the instance is garbage collected.
 *
 * @return The {@link java.io.File File} to be used for temporary storage.
 */
protected File getTempFile() {
  if (tempFile == null) {
    File tempDir = repository;
    if (tempDir == null) {
      tempDir = new File(System.getProperty("java.io.tmpdir"));
    }
    String tempFileName =
        String.format("upload_%s_%s.tmp", UID, getUniqueId());
    tempFile = new File(tempDir, tempFileName);
  }
  return tempFile;
}

/**
 * Creates and returns a {@link java.io.File File} representing a uniquely
 * named temporary file in the configured repository path. The lifetime of
 * the file is tied to the lifetime of the <code>FileItem</code> instance;
 * the file will be deleted when the instance is garbage collected.
 * <p>
 * <b>Note: Subclasses that override this method must ensure that they return the
 * same File each time.</b>
 *
 * @return The {@link java.io.File File} to be used for temporary storage.
 */
protected File getTempFile() {
  if (tempFile == null) {
    File tempDir = repository;
    if (tempDir == null) {
      tempDir = new File(System.getProperty("java.io.tmpdir"));
    }
    String tempFileName =
        String.format("upload_%s_%s.tmp", UID, getUniqueId());
    tempFile = new File(tempDir, tempFileName);
  }
  return tempFile;
}