LoadGraphServlet is an abstract servlet class that allows to read a file from an input stream and send it to the client. Subclasses will only have to override the getInputStream() method.

SaveGraphServlet is an abstract servlet class that allows to save a graph that was send from the client. SaveGraphServlet uses either a parameter of the request or the request input stream to read the data that is to be saved. Subclasses only have to override the createSaveStream() method.

DownloadServlet is a ready-to-use servlet that can be used for saving a graph on the client. The response is sent using the attachement content type, so that the client application will show a download dialog. DownloadServlet uses either a parameter of the request or the request input stream to read the data that is to be saved on the client.

UploadServlet is a ready-to-use servlet that can be used for loading a graph from the client's file system. The data is retrieved from the request's input stream sent back in the response. This servlet expects "multipart/form-data" as sent from a call to flash.net.FileReference.upload or a UploadHandler.

ExportServlet simply takes the export data from the request and creates a file download for it. The data is either taken from the response parameter provided in the constructor, or the request's input stream is used.

For customization, the method getExportDataInputStream() can be overridden.