Extract content stream(Images, Text and graphics) with in a BBOX. And place it back in new PDF without loosing any style?

问题

I have existing content stream in pdf. And I wanted to extract the content stream under the below bounding box's.

1st BBox the graphics, text content stream . 2nd BBOX text, some math equations related content stream. 3rd BBOX Image plus text content stream is there.

1. So I want to extract the all content stream with in the bbox?

2. After extracting content stream I will do tagging related manipulation in content stream and I want to place it back to new PDF?

This operations I wanted to do by using PDFBox. Is it possible?

Please help me how can I achieve this..

来源：https://stackoverflow.com/questions/59489717/extract-content-streamimages-text-and-graphics-with-in-a-bbox-and-place-it-b