CN112818274B - Method for converting PDF file into paging HTML file and computer equipment - Google Patents

Abstract

The invention relates to a method for converting a PDF file into a paging HTML file and computer equipment. The method comprises the following steps: s1, receiving a PDF file, and converting the PDF file into a single HTML file and a plurality of font files, wherein each font file contains one type of fonts in the PDF file; s2, separating a CSS file, a JavaScript file and a plurality of HTML subfiles after analyzing the HTML file, wherein each page of the PDF file corresponds to one HTML subfile; combining the plurality of font files into a single text page file; s3, storing the CSS file, the JavaScript file, the plurality of HTML subfiles and the text page file. After the PDF file is converted into the paging HTML file, the browser is not required to install the PDF plug-in, only one page of content is loaded at a time, the loading speed is high, and the use flow is low.

Description

Method and computer equipment for converting PDF files into paginated HTML files

Technical field

The present invention relates to the field of PDF web page display, and more specifically, to a method and computer equipment for converting a PDF file into a paged HTML file.

Background technique

Some website materials exist in the form of PDF (Portable Document Format) files, and users use a browser to access PDF files. In the existing technology, browsers mainly use two methods to load PDF files:

One way is to use a PDF plug-in to download PDF files directly. This method requires the browser to download the PDF plug-in and download the entire PDF file. If the PDF file is too large, it will consume too much data and take too long to load.

Another way is that the server converts the PDF file into an HTML file, and the browser loads the HTML file. In this method, the entire PDF file needs to be loaded. If the PDF file is too large, it will consume too much traffic and take too long to load.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and computer equipment for converting a PDF file into a paged HTML file in view of the above-mentioned defects of the prior art.

The technical solution adopted by the present invention to solve the technical problem is to construct a method for converting a PDF file into a paged HTML file, including:

S1. Receive a PDF file, and convert the PDF file into a single HTML file and multiple font files, each of the font files containing a type of font in the PDF file;

S2. After parsing the HTML file, separate CSS files, JavaScript files and multiple HTML sub-files. Each page of the PDF file corresponds to one HTML sub-file; merge multiple font files into a single text page. document;

S3. Store the CSS file, the JavaScript file, a plurality of the HTML sub-files and the text page file.

Further, in the method of converting a PDF file into a paged HTML file according to the present invention, the step S3 includes:

The CSS file, the JavaScript file, a plurality of the HTML sub-files and the text page file are named according to the file number corresponding to the PDF file, and the name of each HTML sub-file includes a corresponding page number. Information, store the named CSS file, the JavaScript file, a plurality of the HTML sub-files and the text page file in the same folder, and the folder is named with the file number.

Further, in the method of converting a PDF file into a paged HTML file according to the present invention, after the step S3, it also includes:

S4. The server receives the PDF file access request, searches for the CSS file, the JavaScript file, the text page file and one of the HTML sub-files corresponding to the PDF file access request, and sends the searched file to browser;

S5. The browser loads the CSS file, the JavaScript file, the text page file and the HTML sub-file, and the HTML sub-file displays the content of one page of the PDF file.

Further, in the method of converting a PDF file into a paged HTML file according to the present invention, the HTML sub-file is the HTML sub-file corresponding to the content of the first page of the PDF file.

Further, in the method of converting a PDF file into a paged HTML file according to the present invention, after the step S5, it also includes:

S6. The server receives the page continuation access instruction, searches for the HTML sub-file corresponding to the page continuation access instruction, and sends it to the browser;

S7. The browser receives and displays the content of one page of the PDF file corresponding to the HTML sub-file.

Further, in the method of converting a PDF file into a paged HTML file according to the present invention, when displaying the text in the page, the browser converts the text format in the text page file into a web page text format for display.

Furthermore, in the method of converting a PDF file into a paging HTML file according to the present invention, if the browser displays garbled characters when displaying the text in the page, it will be re-rendered according to the text format in the text page file.

Further, in the method of converting a PDF file into a paged HTML file according to the present invention, when the browser displays the text in the page, it loads the content corresponding to the page number in the text page file.

Further, in the method of converting a PDF file into a paging HTML file according to the present invention, in step S6, before searching for the HTML sub-file corresponding to the page continued access instruction, it also includes:

Determine whether the current access user has permission to continue reading;

If so, search for the HTML sub-file corresponding to the instruction to continue accessing the page.

In addition, the present invention also provides a computer device, including a memory and a processor;

The memory is used to store computer programs;

The processor is configured to execute a computer program stored in the memory to implement the above-mentioned method of converting a PDF file into a paged HTML file.

Implementing a method and computer equipment for converting a PDF file into a paged HTML file of the present invention has the following beneficial effects: after the present invention converts a PDF file into a paged HTML file, the browser does not need to install a PDF plug-in, and only one page is loaded each time. page content, fast loading speed, and low traffic usage.

Description of the drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples. In the accompanying drawings:

Figure 1 is a flow chart of a method for converting a PDF file into a paged HTML file according to an embodiment;

Figure 2 is a flow chart of a method for converting a PDF file into a paged HTML file according to an embodiment;

Figure 3 is a flow chart of a method for converting a PDF file into a paged HTML file according to an embodiment;

FIG. 4 is a flow chart of a method for converting a PDF file into a paged HTML file according to an embodiment.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

In a preferred embodiment, referring to Figure 1, the method of converting a PDF file into a paged HTML file in this embodiment includes the following steps:

S1. Receive PDF files and convert the PDF files into a single HTML file and multiple font files. Each font file contains a type of font in the PDF file. Specifically, the server receives the PDF file, uses preset commands to convert the PDF file, and converts the PDF file into a single HTML file and multiple font files. The preset commands used in the conversion process can refer to the existing technology. Since PDF files generally contain multiple fonts, each converted font file contains a type of font in the PDF file, that is, each font in the PDF file is concentrated in one text file.

S2. After parsing the HTML file, separate CSS files, JavaScript files and multiple HTML sub-files. Each page of the PDF file corresponds to an HTML sub-file; merge multiple font files into a single text page file. Specifically, the HTML file generated from the PDF file contains CSS content and JavaScript content for web page loading. After parsing the HTML file, the CSS content and JavaScript content are separated from it, the CSS content is set as a separate CSS file, and the JavaScript content is set as Separate JavaScript files. It can be understood that the HTML file generated from the PDF file also contains the content corresponding to all page numbers of the PDF file. The HTML file is parsed according to the page number information in the HTML file to obtain multiple HTML sub-files. Each page of the PDF file corresponds to one HTML sub-file. ; In other words, each page of the PDF file corresponds to an HTML sub-file.

S3, stores CSS files, JavaScript files, multiple HTML sub-files and text page files. Specifically, the CSS file, JavaScript file, multiple HTML sub-files and text page files are named according to the file number corresponding to the PDF file, and the name of each HTML sub-file contains the corresponding page number information. The named CSS file, JavaScript files, multiple HTML sub-files and text page files are stored in the same folder, and the folder is named after the file number. Establish the corresponding relationship between file numbers and folders, CSS files, JavaScript files, multiple HTML sub-files and text page files. In the subsequent file request process, the corresponding files can be quickly searched based on the file number to improve response speed.

When the server receives multiple PDF files, it converts and stores them one by one according to the above steps S1 to S3 for browser access. After converting the PDF file into a paginated HTML file in this embodiment, the browser does not need to install a PDF plug-in, and only one page of content is loaded at a time, which results in fast loading and low traffic usage.

In a preferred embodiment, referring to Figure 2, the method of converting a PDF file into a paging HTML file in this embodiment also includes the steps after step S3:

S4. The server receives the PDF file access request, searches for the CSS file, JavaScript file, text page file and one of the HTML sub-files corresponding to the PDF file access request, and sends the searched file to the browser. Specifically, the browser installed on the user terminal sends a PDF file access request to the server. After receiving the PDF file access request, the server searches for the CSS file, JavaScript file, text page file and one of the HTML sub-files corresponding to the PDF file access request. Send the found files to the browser. Among them, the PDF file access request corresponding to one of the HTML sub-files means that the PDF file access request contains page number information, which can be any page, such as page 1, page 3, page 5, etc., and the page number information corresponds to an HTML sub-file. document. As an option, if the PDF file access request does not include page number information, the HTML subfile defaults to the HTML subfile corresponding to the content of the first page of the PDF file, that is, the HTML subfile corresponding to the first page of the PDF file is delivered to the browser.

S5. The browser loads CSS files, JavaScript files, text page files and HTML sub-files. The HTML sub-file displays the content of one page of the PDF file. Specifically, after the browser receives the CSS file, JavaScript file, text page file and HTML sub-file, it loads the CSS file, JavaScript file, text page file and HTML sub-file, and the HTML sub-file displays the content of one page of the PDF file. It is understandable that since each PDF file only corresponds to a CSS file and a JavaScript file, the CSS file and JavaScript file are loaded during the initial load to establish the basic parameters and environment of the web page. When subsequent display of other page numbers of the PDF file, it will not work. Then you need to load CSS files and JavaScript files. In addition, the text page file is composed of multiple font files corresponding to the PDF, so it contains all the content information of the PDF file. It should be noted that this embodiment does not load and display all the page content at once, but loads the text page. The content corresponding to the HTML sub-file in the file. For example, if the HTML sub-file corresponds to the first page of the PDF file, then the text page file will only load and display the content of the first page. Although the content of other pages has been downloaded to the browser, it will not be loaded and displayed, that is, the user cannot see it. Arrived.

The browser in this embodiment can request to view a certain page of PDF files, and the server only needs to load the file corresponding to one page of PDF files. The loading speed is fast and the usage of traffic is small, which improves the user experience and reduces the data processing pressure of the server.

In a preferred embodiment, referring to Figure 3, the method of converting a PDF file into a paged HTML file in this embodiment further includes the steps after step S5:

S6. The server receives the page continue access instruction, searches for the HTML subfile corresponding to the page continue access instruction, and sends it to the browser. Specifically, after viewing the current page, the user can generate a page continuation access instruction through virtual keys, mouse, keyboard, touch screen, etc., and the browser sends the page continuation access instruction to the server. After receiving the page continue access instruction, the server searches for the HTML sub-file corresponding to the page continue access instruction and sends it to the browser. It is understandable that when searching for the page continue access instruction, you no longer need to search for CSS files, JavaScript files and text page files, but only need to search for the HTML sub-file corresponding to the page continue access instruction, thereby achieving fast loading. Alternatively, the page continuation access instruction may be a previous page access instruction, a next page access instruction, etc.

S7. The browser receives and displays the content of one page of the PDF file corresponding to the HTML sub-file. Specifically, after the browser receives the HTML sub-file, since the CSS file and JavaScript file have been loaded during the first visit, and there are already relevant environment parameters, it only needs to load the HTML sub-file when displaying the HTML sub-file. Correspondingly, the content corresponding to the HTML sub-file in the text page file is found and displayed.

Repeat steps S6 and S7 to implement page-by-page access of the PDF file until access to all pages of the PDF file is completed. In this embodiment, during the continuous loading of PDF file pages, only one HTML sub-file is loaded each time, which results in fast loading speed, low traffic usage, and improved user experience.

In the method of converting a PDF file into a paged HTML file in some embodiments, the browser is set with a web page text format. When the browser displays the text in the page, it converts the text format in the text page file into a web page text format for display, so that The text of the PDF file is displayed according to the requirements of the web page, making it more neat and beautiful.

In the method of converting a PDF file into a paged HTML file in some embodiments, because the PDF file itself has a lot of content and a lot of font formats, some font formats may not be directly displayed on the browser. If the browser displays garbled characters when displaying the text on the page, it means that some fonts cannot be displayed normally and need to be re-rendered according to the text format in the text page file. That is, the garbled files must be directly rendered according to their original format in the PDF file. Render display to solve the problem of garbled characters.

In a preferred embodiment, referring to Figure 4, in the method of converting a PDF file into a paged HTML file in this embodiment, step S6 includes:

S61. The server receives the page continue access instruction and determines whether the current access user has the continue reading permission; if the current access user has the continue reading permission, it searches for the HTML subfile corresponding to the page continue access instruction and sends it to the browser. Specifically, in order to facilitate the management of different users' permissions to access PDF files, this embodiment requires users to log in to the server using user accounts, and the permissions of each user account are stored in the server. The server receives the page continue access instruction and determines whether the current access user has the continue reading permission; if the current access user has the continue reading permission, it searches for the HTML subfile corresponding to the page continue access instruction and sends it to the browser. If the current access user does not have permission, a prompt message is sent to the browser to prompt the user that he does not have permission to continue accessing. This embodiment implements rights management through page-by-page display of PDF files to facilitate management of partial contents of the PDF.

In a preferred embodiment, the computer device of this embodiment includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory to implement the above-mentioned method of converting a PDF file into a paged HTML file. . After the computer device of this embodiment converts the PDF file into a paged HTML file, the browser does not need to install a PDF plug-in, and only one page of content is loaded at a time, which results in fast loading speed and low traffic usage.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For relevant details, please refer to the description in the method section.

Those skilled in the art may further realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. In order to clearly illustrate the possible functions of hardware and software, Interchangeability, in the above description, the composition and steps of each example have been generally described according to functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered to be beyond the scope of the present invention.

The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly in hardware, in software modules executed by a processor, or in a combination of both. Software modules may be located in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or anywhere in the field of technology. any other known form of storage media.

The above embodiments are only for illustrating the technical concepts and characteristics of the present invention. Their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot limit the scope of protection of the present invention. All equivalent changes and modifications to the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (4)

1. A method for converting PDF files into paginated HTML files, which is characterized by including: S1. Receive a PDF file, and convert the PDF file into a single HTML file and multiple font files, each of the font files containing a type of font in the PDF file; S2. After parsing the HTML file, separate CSS files, JavaScript files and multiple HTML sub-files. Each page of the PDF file corresponds to one HTML sub-file; merge multiple font files into a single text page. file, wherein the name of each HTML sub-file contains corresponding page number information; S3. Store the CSS file, the JavaScript file, a plurality of the HTML sub-files and the text page file; S4. The server receives the PDF file access request, searches for the CSS file, the JavaScript file, the text page file and one of the HTML sub-files corresponding to the PDF file access request, and sends the searched file to A browser, wherein the PDF file access request includes page number information; S5. The browser loads the CSS file, the JavaScript file, the text page file and the HTML sub-file, and the HTML sub-file displays the content of one page of the PDF file. When describing the CSS file and the JavaScript file, the basic parameters and environment of the web page are established. When subsequently displaying other page numbers of the PDF file, there is no need to load the CSS file and the JavaScript file, and the server no longer needs to load all the page numbers. The CSS file, the JavaScript file and the text page file are sent to the browser; S6. The server receives the page continuation access instruction, searches for the HTML sub-file corresponding to the page continuation access instruction, and sends it to the browser; in step S6, between the search and the The HTML sub-file corresponding to the page continuation access instruction also includes: determining whether the current access user has permission to continue reading; if so, searching for the HTML sub-file corresponding to the page continuation access instruction; S7. The browser receives and displays the content of one page of the PDF file corresponding to the HTML sub-file; when displaying the text in the page, the browser loads the content corresponding to the page number in the text page file; When the browser displays the text in the page, it converts the text format in the text page file into the text format of the web page for display; if garbled characters appear when the browser displays the text in the page, it will display the text in the text page file. Text formatting in the file is re-rendered. 2. The method of converting a PDF file into a paged HTML file according to claim 1, characterized in that the step S3 includes: The CSS file, the JavaScript file, a plurality of the HTML sub-files and the text page file are named according to the file number corresponding to the PDF file, and the name of each HTML sub-file includes a corresponding page number. Information, store the named CSS file, the JavaScript file, a plurality of the HTML sub-files and the text page file in the same folder, and the folder is named with the file number. 3. The method of converting a PDF file into a paged HTML file according to claim 1, wherein the HTML sub-file is the HTML sub-file corresponding to the content of the first page of the PDF file. 4. A computer device, characterized by comprising a memory and a processor; The memory is used to store computer programs; The processor is configured to execute the computer program stored in the memory to implement the method of converting a PDF file into a paged HTML file as described in any one of claims 1 to 3.