OpenPDF is an open-source Java library for creating, editing, rendering, and encrypting PDF documents, as well as generating PDFs from HTML. It is licensed under the LGPL and MPL open source licenses.

在实际的业务开发的时候，研发人员往往会碰到很多这样的一些场景，需要提供相关的电子凭证信息给用户，例如网银／支付宝／微信购物支付的电子发票、订单的库存打印单、各种电子签署合同等等，以方便用户查看、打印或者下载。 例如下图的电子发票！

public static final String SRC = "src/main/resources/hello.pdf"; public static final String DEST = "results/chapter4/hello_token.pdf"; public static final String DLL ...