public void testDelSignatures(){
      KGOfdHummer hummer = null;
            try {
                   //创建文档编辑实例
                  hummer = KGOfdHummer.createInstance("D:/ofd/test.ofd", null, "D:/ofd/1.ofd");
                   //删除全部电子签章
                  DeleteSignature deleteSignature = new DeleteSignature();
                   //添加任务接口
                  hummer.addExecute(deleteSignature);
                   //执行任务
                  hummer.doExecute();
            } catch (Exception e) {
                  e.printStackTrace();
            }
}