Design And Implementation Of SuperPDF Plugin

With the continuous development of the Internet era,the demand for previewing files in learning and daily life is increasing day by day.The traditional way of viewing files requires downloading them and then opening them for viewing.This viewing method can no longer keep up with the accelerating pace of current life and work.At this time,there is an urgent need for the emergence of fast upload,view,and print download functions for files.How to quickly and safely upload,preview,download,and print large files under multithreaded network requests,and how to achieve fast,safe,and efficient implementation is the focus of this article’s research.PDF files can be well saved in file formats,and are suitable for operating systems such as Office2003,WPS,Windows,Unix,or Mac OS,making it highly cross platform.It does not rely on any preview software or operating system.And PDF files are saved with visual interaction,making the document display effect papery and realistic,making it easy for readers to read.The various advantages of PDF files can fully replace paper and achieve paperless office work.So this article chooses to study the adaptive slicing upload,preview clarity,and sensitive word recognition functions of PDF files.The main work of the Super PDF plugin is as follows:(1)The adaptive slicing method can shorten the upload time.Due to the limitations of multithreading,high concurrency,broadband,and large files,the time from uploading to viewing files is not optimistic,which affects the user experience.This article proposes using Node.js’ worker multithreading combined with HTML5’s File API to upload in a read write stream mode,achieving adaptive slicing upload,breakpoint retry,recovery upload,and MD5 second transfer for single and multiple files,improving operational efficiency and reducing user waiting time.(2)Modify the physical pixels of the device to improve the clarity of the preview file.Faced with high-resolution screen upgrades,the appearance of 2K and 4K screens has greatly improved the smoothness of the screen,color reproduction,and image saturation.To address the issue of file preview clarity,a method is proposed to modify the device pixel ratio device Pixel Ratio parameter,which uses device resolution and file width and height calculation to process file clarity.(3)Layered extraction of PDF files can improve the recognition and matching speed of sensitive words in files.Most systems generally do not verify the content of uploaded files,and some sensitive words converted from text or pinyin may be successfully uploaded,which poses great security risks to the network environment.To address the issue of sensitive word recognition,a hierarchical extraction and matching method is proposed for PDF files,which organizes objects by constructing keywords such as {key: value},Analyze the page content information and page font information in the four layer logical structure of the file layer by layer.Finally,this paper develops relevant functions as modules,which reduces the coupling of plug-ins and improves the cohesion of plug-ins.Under high load network requests,the upload time was compared with the FTP algorithm,and the slicing upload time was shorter.However,when the network was poor,the upload speed of multiple large files simultaneously did not exceed the comparison algorithm.This article compares the hierarchical extraction algorithm with the PDFBox extraction algorithm,which reduces the matching time by 2/3 times and improves the efficiency of sensitive word recognition.File upload preview enables accurate file layout,real-time loading,and fast responsiveness in slicing display.Each function can be referenced and extended as an independent module in the project.