code: public void setUploadTempDir(File uploadTempDir) throws IOException {
          if (!uploadTempDir.exists() && !uploadTempDir.mkdirs()) {
              String message = "Given uploadTempDir [" + uploadTempDir + "] could not be created.";
              throw new IllegalArgumentException(message);
          }
          this.mFileItemFactory.setRepository(uploadTempDir);
      }
docs: Set the temporary directory where uploaded files get stored.