CN110717127A - Method and device for on-line analysis and browsing of OFD (office file) - Google Patents
Method and device for on-line analysis and browsing of OFD (office file) Download PDFInfo
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- CN110717127A CN110717127A CN201910972680.6A CN201910972680A CN110717127A CN 110717127 A CN110717127 A CN 110717127A CN 201910972680 A CN201910972680 A CN 201910972680A CN 110717127 A CN110717127 A CN 110717127A
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- G—PHYSICS
- 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
- G06F16/9577—Optimising the visualization of content, e.g. distillation of HTML documents
Abstract
The invention provides a method and a device for analyzing and browsing an OFD file on line. After the client turns pages, if the server does not pre-generate the corresponding HTML and CSS files, generating the page after turning the pages, and continuing to re-trigger the pre-generation service from the page after turning the pages; and if the HTML and CSS files corresponding to the page turning pages are pre-generated by the server, the pre-generated files are directly utilized for front-end display. According to the invention, the OFD file does not need to be decompressed completely, and the page turning response capability is improved by pre-generating the file; the invention can directly generate text format, which is convenient for users to select or copy characters on the webpage.
Description
Technical Field
The invention relates to the field of internet, in particular to a method and a device for on-line analysis and browsing of OFD files.
Background
The OFD is one of the electronic format document standards in China, is the electronic official document exchange and storage format standard in China, has the characteristic of fixed format, and can be borne by the standard when the solidification result of various document typesetting requirements. At present, most OFD files are browsed through a client. With the widespread use of OFD files, the need of how to open, display, and even manipulate OFD documents in a browser is urgent.
The existing schemes for browsing the OFD documents on line mainly include two types:
the first method comprises the following steps: the browser plug-in method mainly comprises the following operation steps:
(1) installing an OFD reading plug-in of a browser;
(2) the installed plug-in carries out OFD file display or is embedded into a browser to display a document by calling a local reading program;
and the second method comprises the following steps: HTML5 Canvas drawing method
The method is a text of 'method, device and process for on-line display of OFD files based on HTML 5' from Chinese patent application with publication number CN 107943915A. The main steps of the method disclosed in this patent application are as follows:
(1) uploading OFD files to a server, decompressing the files, and mapping file directories to HTML5 clients;
(2) the HTML5 client analyzes the XML in the OFD file according to the mapping address;
(3) reading XML information one by one according to the standard of the OFD file and drawing the XML information in Canves;
(4) the HTML5 client displays the drawn Canves.
The method analyzes the XML and draws and generates the Canves, ensures the consistency of document display, but cannot select and copy characters like browsing normal documents, and does not consider the influence of large files.
Based on the above description, the disadvantages of the prior art are summarized as follows:
(1) as the security requirements of the existing browser on the plug-ins are continuously improved, the stability of the browser based on the plug-ins is lower and lower;
(2) the Canves method cannot select and copy texts when a client browses;
(3) decompression of the OFD file occupies system resources;
(4) when a large file is browsed, the browser is stressed greatly by analyzing and drawing all files.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for online parsing and browsing an OFD file, which do not need to decompress the OFD file during online previewing, extract a required file as needed to parse the file, generate corresponding HTML (hypertext markup file) and CSS (style file) files, and pre-generate non-previewed content at a server.
The technical scheme of the invention is as follows:
in a first aspect, the present invention provides a method for online parsing and browsing OFD files, including the steps of initial parsing:
step S101, a server receives an OFD file;
step S102, extracting and analyzing a public resource file in the OFD file;
step S103, analyzing document.xml files in the OFD files;
step S104, analyzing the nth page designated by the client and generating HTML and CSS of the nth page;
step S105, rendering the generated HTML and CSS of the nth page by the browser;
n is an integer of 1 or more.
As a further step of step S102, the specific operation of extracting the public resource file is: and extracting all files in the Res directory to a folder corresponding to the server, wherein the folder is named by the corresponding file ID.
As a further step of step S104, the step of generating HTML and CSS includes:
step a, reading a content.xml file of a page to be analyzed;
and b, analyzing the content.xml file and starting to convert, wherein each page is a div, each element is embedded into the corresponding div in sequence until all the elements are embedded, all the divs are written into HTML once, and the styles of all the divs are written into CSS.
Preferably, the elements include text elements, image elements and vector image elements.
Preferably, the embedding manner of the image type element is as follows: generating a corresponding image label in the div, describing the size and the cutting range of the image in the OFD, generating a corresponding CSS file and binding the CSS file with the image label;
the embedding mode of the character elements is as follows: generating a corresponding div, wherein the div comprises a displayed font, and generating a corresponding CSS according to the color, the size and the position of the font and the index of a font file and binding the CSS with the div;
the vector diagram type elements are embedded in the following modes: firstly, generating div, embedding the vector path in the div, and rendering to generate canvas; and generating CSS by the position attribute and the color attribute of the vector diagram and binding the CSS with the vector diagram.
The method for online analyzing and browsing the OFD file in the first aspect of the present invention further includes a pre-generation step, where the pre-generation step is triggered after the step S104 is completed, and the pre-generation step includes:
step S106, judging whether all pages are analyzed and generating HTML and CSS, and if so, stopping analyzing; if not, go to step S107;
and step S107, analyzing the pages after the nth page, sequentially generating HTML and CSS for all the pages after the nth page, and storing the HTML and CSS.
The method for analyzing and browsing the OFD file on line in the first aspect of the invention further comprises the step of page turning analysis:
step S201, turning pages of the client to the mth page;
step S202, detecting whether HTML and CSS of the mth page are generated in advance or not, if so, directly extracting the HTML and CSS of the mth page and rendering; if not, go to step S203;
step S203, analyzing the mth page and generating HTML and CSS of the mth page;
and step S204, rendering the generated HTML and CSS of the mth page by the browser.
Preferably, the rendering process is performed by JavaScript or java.
The method for on-line analyzing and browsing the OFD file in the first aspect of the invention further comprises the step of pre-generating after page turning:
step S205, judging whether all pages are analyzed and generating HTML and CSS, if so, stopping analyzing; if not, go to step S206;
and step S206, analyzing the pages after the mth page, sequentially generating HTML and CSS for all the pages after the mth page, and storing the HTML and CSS until the client turns pages again or quits.
In a second aspect of the present invention, an apparatus for online parsing and browsing an OFD file is provided, which includes:
a receiving module: receiving an OFD file, and extracting a public resource file in the OFD file;
an analysis module: analyzing document.xml files in the OFD files, analyzing pages appointed to be browsed by a client and generating HTML and CSS; pre-generating and storing HTML and CSS of a page behind the designated page;
a display module: rendering HTML and CSS of a page appointed to be browsed by a client;
a storage module: for saving pre-generated HTML and CSS.
The page appointed to be browsed by the client comprises a page appointed for the first time and a page appointed after page turning.
The invention has the beneficial effects that:
the OFD file is not required to be completely decompressed, and only the required page is analyzed and previewed to generate a corresponding HTML file and a corresponding style file (CSS);
a file is generated in advance, and the page turning response capability is improved;
the text format is directly generated, so that a user can conveniently select or copy the characters on the webpage.
Drawings
FIG. 1 is a flow diagram of the initial parsing and preview of the present invention;
FIG. 2 is a flow chart illustrating a page turning operation according to the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
The method comprises the steps of selecting a file through a browser when an OFD file needs to be previewed, uploading the file to a server, and carrying an ID code to which the file belongs while uploading. The server side firstly extracts all resources under Res directory in the OFD file to a folder named by the document ID of the server side, and analyzes OFD.xml and corresponding document.xml; then, the file of the specified page number of the client is analyzed and standard HTML and CSS are generated, then, a pre-generation service is triggered, and HTML and CSS of other page number files are generated page by page from the page. After the client turns pages, if the server does not have corresponding HTML and CSS files, generating the page after the pages are turned, and then triggering the pre-generation service again from the page after the pages are turned; and if the HTML and CSS files corresponding to the page turning pages are pre-generated by the server, the pre-generated files are directly utilized for front-end display.
The client side refers to a user, and the server side refers to an online analyzing and browsing device.
The invention discloses a method for analyzing and browsing an OFD file on line, which comprises an initial analyzing step and a page turning analyzing step.
Specifically, the process of initial parsing in the present invention is shown in fig. 1, where a client designates to browse a file of an nth page, and the specific steps are as follows:
step S101, the server receives the OFD file.
And step S102, extracting and analyzing the public resource file.
And the server side extracts all the public resource files, namely the files in the Res directory, to the folder named by the document ID.
Step S103, analyzing document.xml files in the OFD files;
step S104, analyzing the nth page appointed by the client, and generating HTML and CSS for the appointed page;
the elements of the OFD file can be classified into 3 types: a text class, an image class, and a vector graphics class.
The specific procedure for generating HTML and CSS is as follows:
step a, reading a content.xml file of a page to be analyzed;
b, analyzing a content.xml file and starting to convert, wherein each page is a div, each element is embedded into the corresponding div in sequence until all the elements are embedded, all the divs are written into HTML once, and the styles of all the divs are written into CSS; note: the div tag is used to define a partition or section in the HTML document.
For the image class element, generating a corresponding image (image) tag in HTML, wherein the OFD describes the size and the clipping range of the image, and generating a corresponding CSS file and binding the CSS file with the tag;
generating corresponding div for the elements of the text class, wherein the div comprises a displayed font, and generating a corresponding CSS according to the color, the size and the position of the font and the index of a font file and binding the CSS with the div;
for a vector file, firstly generating a div, embedding the vector path in the div, and rendering to generate canvas; and generating CSS by the position attribute, the color attribute and the like of the vector file and binding the CSS with the vector file.
And step S105, rendering the generated HTML and CSS of the nth page by the browser.
The rendering process can be directly operated by JS or java. JS full scale: JavaScript, which is a web-based scripting language, is often used to add various dynamic functions to a web page, and provides a smoother and more beautiful browsing effect for a user. Usually, JavaScript scripts implement their functions by being embedded in HTML. If the mode of front-end and back-end separation is adopted, the control operation is realized through JS, and if the mode of back-end control is adopted, the view is controlled through java.
Further, in step S104, after generating the HTML and CSS of the designated page, triggering a pre-generation service, where the pre-generation service includes:
step S106, judging whether all pages are analyzed and generating HTML and CSS, and if so, stopping analyzing; if not, go to step S107;
and step S107, analyzing the pages after the nth page of the designated page, sequentially generating HTML and CSS for all the pages after the designated page, and storing.
The way in which HTML and CSS are generated in this step is the same as that of step S104.
The pre-generated file can be saved to a designated position of the server or a designated database.
When a client turns to the mth page and wants to browse the content of the mth page, a page turning analysis operation is performed, wherein the page turning analysis step comprises the following steps:
step S201, turning pages of the client to the mth page;
step S202, detecting whether HTML and CSS of a page after page turning, namely the mth page, are generated in advance, and if so, directly extracting the HTML and CSS of the corresponding mth page and rendering the HTML and CSS; if not, go to step S203;
step S203, analyzing the mth page and generating HTML and CSS of the mth page;
and step S204, rendering the generated HTML and CSS of the mth page by the browser.
Further, in step S204, after the HTML and CSS of the mth page are generated, a pre-generation service is triggered, where the pre-generation service includes:
step S205, judging whether all pages are analyzed and generating HTML and CSS, if so, stopping analyzing; if not, go to step S206;
and step S206, analyzing the pages after the mth page, sequentially generating HTML and CSS for all the pages after the mth page, and storing the HTML and CSS until the client turns pages again or quits.
Example two
An embodiment of the present invention provides an apparatus for online parsing and browsing an OFD file, including: the device comprises a receiving module, an analysis module, a display module and a storage module.
A receiving module: and receiving the OFD file, and extracting the public resource file in the OFD file.
An analysis module: analyzing document.xml files in the OFD files, analyzing pages appointed to be browsed by a client and generating HTML and CSS; pre-generating and storing HTML and CSS of a page behind the designated page;
a display module: and rendering the generated HTML and CSS of the specified page.
A storage module: the method is used for storing the pre-generated HTML and the CSS, and is convenient for the client to directly call the HTML and the CSS of the corresponding page after turning the page.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (10)
1. A method for on-line analysis and browsing of OFD files is characterized in that: the method comprises the following steps of initial analysis:
step S101, a server receives an OFD file;
step S102, extracting and analyzing a public resource file in the OFD file;
step S103, analyzing document.xml files in the OFD files;
step S104, analyzing the nth page designated by the client and generating HTML and CSS of the nth page;
step S105, rendering the generated HTML and CSS of the nth page by the browser;
n is an integer of 1 or more.
2. The method for on-line parsing and browsing of OFD files according to claim 1, wherein: the specific operation of extracting the public resource file is as follows: and extracting all files in the Res directory to a folder corresponding to the server, wherein the folder is named by the corresponding file ID.
3. The method for on-line parsing and browsing of OFD files according to claim 1, wherein: the step of generating the HTML and CSS includes:
step a, reading a content.xml file of a page to be analyzed;
and b, analyzing the content.xml file and starting to convert, wherein each page is a div, each element is embedded into the corresponding div in sequence until all the elements are embedded, all the divs are written into HTML once, and the styles of all the divs are written into CSS.
4. The method for on-line parsing and browsing of OFD files according to claim 3, wherein: the elements comprise character elements, image elements and vector image elements.
5. The method for on-line parsing and browsing of OFD file according to claim 4, wherein: the embedding mode of the image type elements is as follows: generating a corresponding image label in the div, describing the size and the cutting range of the image in the OFD, generating a corresponding CSS file and binding the CSS file with the image label;
the embedding mode of the character elements is as follows: generating a corresponding div, wherein the div comprises a displayed font, and generating a corresponding CSS according to the color, the size and the position of the font and the index of a font file and binding the CSS with the div;
the vector diagram type elements are embedded in the following modes: firstly, generating div, di v, embedding the vector path inside, and rendering to generate canvas; and generating CSS by the position attribute and the color attribute of the vector diagram and binding the CSS with the vector diagram.
6. The method for on-line parsing and browsing of OFD files according to claim 1, wherein: the method further comprises a pre-generation step, wherein the pre-generation step is triggered after the step S104 is completed, and the pre-generation step comprises the following steps:
step S106, judging whether all pages are analyzed and generating HTML and CSS, and if so, stopping analyzing; if not, go to step S107;
and step S107, analyzing the pages after the nth page, sequentially generating HTML and CSS for all the pages after the nth page, and storing the HTML and CSS.
7. The method for on-line parsing and browsing of OFD files according to claim 6, wherein: further comprises a page turning analysis step:
step S201, turning pages of the client to the mth page;
step S202, detecting whether HTML and CSS of the mth page are generated in advance or not, if so, directly extracting the HTML and CSS of the mth page and rendering; if not, go to step S203;
step S203, analyzing the mth page and generating HTML and CSS of the mth page;
and step S204, rendering the generated HTML and CSS of the mth page by the browser.
8. The method for on-line parsing and browsing OFD file according to claim 1, 5 or 7, wherein: the rendering process is operated by JavaScript or java.
9. The method for on-line parsing and browsing of OFD files according to claim 8, wherein: the method further comprises a step of pre-generating after page turning, wherein the step of pre-generating after page turning is triggered after the step S203 is completed, and the step of pre-generating after page turning comprises the following steps:
step S205, judging whether all pages are analyzed and generating HTML and CSS, if so, stopping analyzing; if not, go to step S206;
and step S206, analyzing the pages after the mth page, sequentially generating HTML and CSS for all the pages after the mth page, and storing the HTML and CSS until the client turns pages again or quits.
10. An OFD file online analyzing and browsing device is characterized in that: the method comprises the following steps:
a receiving module: receiving an OFD file, and extracting a public resource file in the OFD file;
an analysis module: analyzing document.xml files in the OFD files, analyzing pages appointed to be browsed by a client and generating HTML and CSS; pre-generating and storing HTML and CSS of a page behind the designated page;
a display module: rendering HTML and CSS of a page appointed to be browsed by a client;
a storage module: for saving pre-generated HTML and CSS.
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| CN111737621A (en) * | 2020-06-17 | 2020-10-02 | 友虹(北京)科技有限公司 | OFD rendering method, system and device based on WASM |
| CN111753502A (en) * | 2020-07-07 | 2020-10-09 | 江苏中威科技软件系统有限公司 | OFD file merging display and directory generation method |
| CN111767698A (en) * | 2020-07-07 | 2020-10-13 | 江苏中威科技软件系统有限公司 | Electronic form system based on OFD format file technology |
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| CN111753502B (en) * | 2020-07-07 | 2021-02-26 | 江苏中威科技软件系统有限公司 | OFD file merging display and directory generation method |
| CN111767698A (en) * | 2020-07-07 | 2020-10-13 | 江苏中威科技软件系统有限公司 | Electronic form system based on OFD format file technology |
| CN111753502A (en) * | 2020-07-07 | 2020-10-09 | 江苏中威科技软件系统有限公司 | OFD file merging display and directory generation method |
| CN112131183A (en) * | 2020-09-07 | 2020-12-25 | 百望股份有限公司 | Linear access method of OFD electronic file |
| CN112487335A (en) * | 2020-12-03 | 2021-03-12 | 江苏中威科技软件系统有限公司 | OFD file reading method based on browser |
| CN112818273A (en) * | 2021-02-05 | 2021-05-18 | 深圳市世强元件网络有限公司 | Method for converting PDF file into HTML embedded picture and computer equipment |
| CN112818274A (en) * | 2021-02-05 | 2021-05-18 | 深圳市世强元件网络有限公司 | Method for converting PDF (Portable document Format) file into paginated HTML (Hypertext markup language) file and computer equipment |
| CN112818274B (en) * | 2021-02-05 | 2024-03-19 | 深圳市世强元件网络有限公司 | Method for converting PDF file into paging HTML file and computer equipment |
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