How to use

generateBoundary

method

in

org.apache.http.entity.mime.MultipartEntity

/**
 * Creates an instance using the specified parameters
 * @param mode the mode to use, may be {@code null}, in which case {@link HttpMultipartMode#STRICT} is used
 * @param boundary the boundary string, may be {@code null}, in which case {@link #generateBoundary()} is invoked to create the string
 * @param charset the character set to use, may be {@code null}, in which case {@link MIME#DEFAULT_CHARSET} - i.e. US-ASCII - is used.
 */
public MultipartEntity(
    HttpMultipartMode mode,
    String boundary,
    Charset charset) {
  super();
  if (boundary == null) {
    boundary = generateBoundary();
  }
  if (mode == null) {
    mode = HttpMultipartMode.STRICT;
  }
  this.multipart = new HttpMultipart("form-data", charset, boundary, mode);
  this.contentType = new BasicHeader(
      HTTP.CONTENT_TYPE,
      generateContentType(boundary, charset));
  this.dirty = true;
}