CN112818273A - Method for converting PDF file into HTML embedded picture and computer equipment - Google Patents
Method for converting PDF file into HTML embedded picture and computer equipment Download PDFInfo
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- CN112818273A CN112818273A CN202110163267.2A CN202110163267A CN112818273A CN 112818273 A CN112818273 A CN 112818273A CN 202110163267 A CN202110163267 A CN 202110163267A CN 112818273 A CN112818273 A CN 112818273A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/957—Browsing optimisation, e.g. caching or content distillation
- G06F16/9574—Browsing optimisation, e.g. caching or content distillation of access to content, e.g. by caching
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/958—Organisation or management of web site content, e.g. publishing, maintaining pages or automatic linking
- G06F16/986—Document structures and storage, e.g. HTML extensions
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Abstract
The invention relates to a method for converting a PDF file into an HTML embedded picture 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 the HTML file comprises each screenshot in the PDF file, and each font file comprises one type of font in the PDF file; s2, separating the CSS file, the JavaScript file and a plurality of HTML subfiles after analyzing the HTML file, wherein each HTML subfile comprises a screenshot of the PDF file; deleting all font files; and S3, storing the CSS file, the JavaScript file and all HTML subfiles. In the invention, each HTML subfile contains one page of picture of the PDF file, so that the page-by-page loading and display of the PDF file are realized, the loading speed is ensured, the user flow is saved, the messy codes are avoided, and the display quality is ensured.
Description
Technical Field
The invention relates to the field of PDF webpage display, in particular to a method for converting a PDF file into an HTML embedded picture and computer equipment.
Background
Some website materials exist in the form of PDF (portable Document format) files, which users access using a browser. In the prior art, a browser mainly adopts two modes to load a PDF file:
one way is to download PDF files directly using a PDF plug-in. This approach requires that the browser must download the PDF plug-in and that the entire PDF file be downloaded. If the PDF file is too large, the problems of too much consumption flow and too long loading time can be caused.
Another way is that the server converts the PDF file into an HTML file and the browser loads the HTML file. In this way, the whole PDF file needs to be loaded, and if the PDF file is too large, the problems of too much consumed flow and too long loading time are caused.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a computer device for converting a PDF file into an HTML embedded picture, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for converting a PDF file into an HTML embedded picture is constructed, which 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 the HTML file comprises each screenshot in the PDF file, and each font file comprises one type of font 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 HTML subfile comprises a screenshot of the PDF file; deleting all the font files;
and S3, storing the CSS file, the JavaScript file and all the HTML subfiles.
Further, in the method for converting a PDF file into an HTML embedded picture according to the present invention, the step S3 includes:
and naming the CSS file, the JavaScript file and all the HTML subfiles according to the file numbers corresponding to the PDF files, wherein the naming of each HTML subfile comprises corresponding page information, and the named CSS file, the named JavaScript file and all the HTML subfiles are stored in the same folder which is named according to the file numbers.
Further, in the method for converting a PDF file into an HTML embedded picture according to the present invention, after step S3, the method further includes:
s4, the server receives a PDF file access request, searches the CSS file, the JavaScript file and one of the HTML subfiles corresponding to the PDF file access request, and sends the searched file to the browser;
s5, the browser loads the CSS file, the JavaScript file and the HTML subfile, and the HTML subfile displays one page of content of the PDF file.
Further, in the method for converting a PDF file into an HTML embedded picture according to the present invention, the HTML subfile is the HTML subfile corresponding to the first page of content of the PDF file.
Further, in the method for converting a PDF file into an HTML embedded picture according to the present invention, after step S5, the method further includes:
s6, the server receives a page continuous access instruction, searches the HTML subfile corresponding to the page continuous access instruction, and issues the HTML subfile to the browser;
and S7, the browser receives and displays a page of content of the PDF file corresponding to the HTML subfile.
Further, in the method for converting a PDF file into an HTML embedded picture according to the present invention, the step S4 further includes: searching a total page number corresponding to the PDF file, and issuing the total page number to the browser;
in step S6, if the continue access instruction is a next page access instruction, before the searching for the HTML sub-file corresponding to the page continue access instruction, the method further includes: and judging whether the current page number is the last page of the total page number, and if not, searching the HTML subfile corresponding to the page continuous access instruction.
Further, in the method for converting a PDF file into an HTML embedded picture according to the present invention, in step S6, before the searching for the HTML subfile corresponding to the page continuation access instruction, the method further includes:
judging whether the current access user has the continuous reading authority;
if so, searching the HTML subfile corresponding to the page continuous access instruction.
Further, in the method for converting a PDF file into an HTML embedded picture according to the present invention, the step S7 includes:
and the browser receives the HTML subfile, dynamically fills the HTML subfile into a DOM structure of the browser, and completes the display of the page corresponding to the PDF file.
In addition, the invention also provides computer equipment, which comprises a memory and a processor;
the memory is used for storing a computer program;
the processor is used for executing the computer program stored in the memory to realize the method for converting the PDF file into the HTML embedded picture.
The implementation of the method for converting the PDF file into the HTML embedded picture and the computer equipment has the following beneficial effects: in the invention, each HTML subfile contains one page of picture of the PDF file, so that the page-by-page loading and display of the PDF file are realized, the loading speed is ensured, the user flow is saved, the messy codes are avoided, and the display quality is ensured.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flowchart of a method for converting a PDF file into an HTML embedded picture according to an embodiment;
FIG. 2 is a flowchart of a method for converting a PDF file into an HTML embedded picture according to an embodiment;
fig. 3 is a flowchart of a method for converting a PDF file into an HTML embedded picture according to an embodiment.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
In a preferred embodiment, referring to fig. 1, the method for converting a PDF file into an HTML embedded picture of this embodiment includes the following steps:
and S1, receiving the PDF file, and converting the PDF file into a single HTML file and a plurality of font files, wherein the HTML file comprises each screenshot in the PDF file, and each font file comprises one type of font in the PDF file. Specifically, the server receives a PDF file, converts the PDF file using a preset command, and converts the PDF file into a single HTML file and multiple font files, where the preset command used in the conversion process may refer to the prior art. The converted HTML file includes a screenshot of each page in the PDF file, i.e. each page of the PDF file corresponds to a screenshot. In addition, because the PDF file generally includes a plurality of fonts, each converted font file includes a type of font in the PDF file, that is, each font in the PDF file is concentrated in one text file.
S2, separating the CSS file, the JavaScript file and a plurality of HTML subfiles after analyzing the HTML file, wherein each HTML subfile comprises a screenshot of the PDF file; all font files are deleted. Specifically, the HTML file generated by the PDF file includes CSS content and JavaScript content for web page loading, the CSS content and the JavaScript content are separated from the HTML file after the HTML file is parsed, the CSS content is set as an individual CSS file, and the JavaScript content is set as an individual JavaScript file. It can be understood that, since the HTML file of this embodiment includes each screenshot of the PDF file, the font file is not needed, and therefore all the font files obtained in step S1 are deleted.
And S3, storing the CSS file, the JavaScript file and all HTML subfiles. Specifically, the CSS file, the JavaScript file and all the HTML subfiles are named according to the file numbers corresponding to the PDF file, the name of each HTML subfile comprises corresponding page number information, the named CSS file, the named JavaScript file and all the HTML subfiles are stored in the same folder, and the folders are named according to the file numbers. And establishing the corresponding relation between the file number and the folder as well as the CSS file, the JavaScript file and all HTML subfiles, and quickly searching the corresponding file according to the file number in the subsequent file requesting process so as to improve the response speed.
When the server receives a plurality of PDF files, the PDF files are converted and stored one by one for the browser to access according to the above steps S1 to S3. In the embodiment, the PDF file is converted into the plurality of HTML subfiles, each HTML subfile contains one page of picture of the PDF file, page-by-page loading and displaying of the PDF file are achieved, loading speed is guaranteed, user flow is saved, messy codes can be avoided, and display quality is guaranteed.
In a preferred embodiment, referring to fig. 2, the method for converting a PDF file into an HTML embedded picture according to this embodiment further includes, after step S3:
s4, the server receives the PDF file access request, searches the CSS file, the JavaScript file and one of the HTML subfiles corresponding to the PDF file access request, and sends the searched file to the browser. Specifically, a browser installed on the user terminal sends a PDF file access request to the server, and after receiving the PDF file access request, the server searches a CSS file, a JavaScript file, and one of the HTML subfiles corresponding to the PDF file access request, and issues the searched file to the browser. The PDF file access request corresponding to one of the HTML subfiles means that the PDF file access request includes page number information, which may be any page, for example, page 1, page 3, page 5, and the like, and the page number information corresponds to one HTML subfile. Optionally, if the PDF file access request does not include page number information, the HTML subfile defaults to the HTML subfile corresponding to the first page of content of the PDF file, that is, the HTML subfile corresponding to the first page of the PDF file is issued to the browser.
S5, the browser loads the CSS file, the JavaScript file and the HTML subfile, and the HTML subfile displays one page of content of the PDF file. Specifically, after receiving the CSS file, the JavaScript file, and the HTML sub-file, the browser loads the CSS file, the JavaScript file, and the HTML sub-file displays one page of content of the PDF file. It can be understood that each PDF file only corresponds to one CSS file and one JavaScript file, and the CSS file and the JavaScript file are loaded during initial loading to establish basic parameters and environments of a web page, and the CSS file and the JavaScript file do not need to be loaded any more when other pages of the PDF file are displayed later.
The browser of the embodiment can request to view a certain page of PDF file, the server only needs to load the file corresponding to the page of PDF file, the loading speed is high, the using flow is small, the user experience is improved, and the data processing pressure of the server is also reduced.
In a preferred embodiment, referring to fig. 3, the method for converting a PDF file into an HTML embedded picture according to this embodiment further includes, after step S5:
and S6, the server receives the page continuous access instruction, searches the HTML subfile corresponding to the page continuous access instruction, and issues the HTML subfile to the browser. Specifically, after the user views the current page, a page continuous access instruction can be generated in a virtual key, a mouse, a keyboard, a touch screen and the like, and the browser sends the page continuous access instruction to the server. And after receiving the page continuous access instruction, the server searches the HTML subfile corresponding to the page continuous access instruction and sends the HTML subfile to the browser. It can be understood that when the page continuous access instruction is searched, the CSS file and the JavaScript file do not need to be searched, and only the HTML subfile corresponding to the page continuous access instruction needs to be searched, so that the rapid loading is realized. Alternatively, the page continuation access instruction may be a previous page access instruction, a next page access instruction, or the like.
S7, the browser receives and displays one page of content of the PDF file corresponding to the HTML subfile. Specifically, after the browser receives the HTML subfile, the browser only needs to load the HTML subfile when displaying the HTML subfile because the CSS file and the JavaScript file are loaded when accessing for the first time and relevant environment parameters exist. That is, the browser receives the HTML subfile, dynamically fills the HTML subfile into the DOM structure of the browser, and completes the corresponding page display of the PDF.
And repeatedly executing the step S6 and the step S7 to realize page-by-page access of the PDF file until all page access of the PDF file is finished. In the continuous PDF file page loading process, only one HTML subfile needs to be loaded each time, the loading speed is high, the use flow is small, and the user experience is improved.
In a preferred embodiment, step S4 of the method for converting a PDF file into an HTML embedded picture includes: the server receives a PDF file access request, searches a CSS file, a JavaScript file and one HTML subfile corresponding to the PDF file access request, and issues the searched file to the browser; and searching the total page number corresponding to the PDF file, and issuing the total page number to the browser. Specifically, a browser installed on the user terminal sends a PDF file access request to the server, and after receiving the PDF file access request, the server searches a CSS file, a JavaScript file, and one of the HTML subfiles corresponding to the PDF file access request, and issues the searched file to the browser. The PDF file access request corresponding to one of the HTML subfiles means that the PDF file access request includes page number information, which may be any page, for example, page 1, page 3, page 5, and the like, and the page number information corresponds to one HTML subfile. Further, in order to determine whether the current page is the last page of the PDF file, the total page number corresponding to the PDF file needs to be searched, and the total page number is issued to the browser.
Step S6 includes: and if the current page number is not the last page of the total page number, searching an HTML subfile corresponding to the page continuous access instruction, and issuing the HTML subfile to the browser. Specifically, after the user views the current page, a page continuous access instruction can be generated in a virtual key, a mouse, a keyboard, a touch screen and the like, and the browser sends the page continuous access instruction to the server. And after receiving the page continuous access instruction, the server judges whether the current page number is the last page of the total page number, if not, the server searches an HTML subfile corresponding to the page continuous access instruction and sends the HTML subfile to the browser. It can be understood that when the page continuous access instruction is searched, the CSS file and the JavaScript file do not need to be searched, and only the HTML subfile corresponding to the page continuous access instruction needs to be searched, so that the rapid loading is realized. And if the current page number is the last page of the total page number, sending a prompt message to prompt that the current page is the last page of the PDF file.
In a preferred embodiment, step S6 of the method for converting a PDF file into an HTML embedded picture includes: and the server receives the page continuous access instruction and judges whether the current access user has continuous reading authority. And if the current access user has the continuous reading permission, searching the HTML subfile corresponding to the page continuous access instruction, and issuing the HTML subfile to the browser. Specifically, after the user views the current page, a page continuous access instruction can be generated in a virtual key, a mouse, a keyboard, a touch screen and the like, and the browser sends the page continuous access instruction to the server. And after receiving the page continuous access instruction, the server searches the HTML subfile corresponding to the page continuous access instruction and sends the HTML subfile to the browser. It can be understood that when the page continuous access instruction is searched, the CSS file and the JavaScript file do not need to be searched, and only the HTML subfile corresponding to the page continuous access instruction needs to be searched, so that the rapid loading is realized. And if the current access user does not have the continuous reading authority, sending prompt information to remind the user that the access authority does not exist.
In a preferred embodiment, the computer device of the present embodiment includes a memory and a processor; the memory is used for storing a computer program; the processor is used to execute a computer program stored in the memory to implement the method of converting a PDF file into an HTML inline picture as described above. The computer equipment of the embodiment converts the PDF file into a plurality of HTML subfiles, each HTML subfile contains one page of picture of the PDF file, page-by-page loading and displaying of the PDF file are achieved, loading speed is guaranteed, user flow is saved, messy codes can be avoided, and display quality is guaranteed.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (9)
1. A method for converting a PDF file into an HTML embedded picture is characterized by comprising 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 the HTML file comprises each screenshot in the PDF file, and each font file comprises one type of font 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 HTML subfile comprises a screenshot of the PDF file; deleting all the font files;
and S3, storing the CSS file, the JavaScript file and all the HTML subfiles.
2. The method for converting a PDF file into an HTML inset picture according to claim 1, wherein said step S3 comprises:
and naming the CSS file, the JavaScript file and all the HTML subfiles according to the file numbers corresponding to the PDF files, wherein the naming of each HTML subfile comprises corresponding page information, and the named CSS file, the named JavaScript file and all the HTML subfiles are stored in the same folder which is named according to the file numbers.
3. The method for converting a PDF file into an HTML inset picture according to claim 1, further comprising after step S3:
s4, the server receives a PDF file access request, searches the CSS file, the JavaScript file and one of the HTML subfiles corresponding to the PDF file access request, and sends the searched file to the browser;
s5, the browser loads the CSS file, the JavaScript file and the HTML subfile, and the HTML subfile displays one page of content of the PDF file.
4. The method as claimed in claim 3, wherein the HTML subfile is the HTML subfile corresponding to the first page of the PDF file.
5. The method for converting a PDF file into an HTML embedded picture according to claim 3, further comprising after step S5:
s6, the server receives a page continuous access instruction, searches the HTML subfile corresponding to the page continuous access instruction, and issues the HTML subfile to the browser;
and S7, the browser receives and displays a page of content of the PDF file corresponding to the HTML subfile.
6. The method for converting a PDF file into an HTML inset picture according to claim 5, wherein said step S4 further comprises: searching a total page number corresponding to the PDF file, and issuing the total page number to the browser;
in step S6, if the continue access instruction is a next page access instruction, before the searching for the HTML sub-file corresponding to the page continue access instruction, the method further includes: and judging whether the current page number is the last page of the total page number, and if not, searching the HTML subfile corresponding to the page continuous access instruction.
7. The method for converting a PDF file into an HTML embedded picture according to claim 5, wherein in step S6, before said searching for the HTML subfile corresponding to the page continuation access instruction, further comprising:
judging whether the current access user has the continuous reading authority;
if so, searching the HTML subfile corresponding to the page continuous access instruction.
8. The method for converting a PDF file into an HTML inset picture according to claim 5, wherein said step S7 comprises:
and the browser receives the HTML subfile, dynamically fills the HTML subfile into a DOM structure of the browser, and completes the display of the page corresponding to the PDF file.
9. A computer device comprising a memory and a processor;
the memory is used for storing a computer program;
the processor is used for executing the computer program stored in the memory to realize the method for converting the PDF file into the HTML embedded picture according to any one of claims 1 to 8.
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