CN103389969B - A kind of methods, devices and systems for mobile terminal preview pdf document - Google Patents
A kind of methods, devices and systems for mobile terminal preview pdf document Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of methods, devices and systems for mobile terminal preview pdf document.The method comprises: the pdf document preview request that mobile terminal receive sends, and obtains pdf document according to described preview request; Described pdf document is converted to picture, the picture be converted to is carried in web page contents and issues mobile terminal.Even if application the invention enables mobile terminal not possess module for resolving pdf document, also can based on browser online reading pdf document.
Description
Technical field
The present invention relates to field of computer technology, particularly relate to a kind of methods, devices and systems for mobile terminal preview portable file layout (PortableDocumentFormat, PDF) file.
Background technology
Pdf document plays very important effect in the life of people, owing to being a kind of portable electronic document format, and be all general in several operation systems, this performance makes PDF become to carry out on network the desirable document format of electronic document distribution and digital information propagation, and increasing e-book, the description of product, company's proclamation, network data, Email bring into use the file of PDF.And along with the development of internet, people are not content with this read purposefully pdf document, post and wish to read online pdf document based on the browser on mobile terminal.
At present, the mobile terminal reading online pdf document based on browser can be provided, be generally high-grade mobile terminal, it is provided with the module for resolving pdf document in a browser, the pdf document that mobile terminal reception server is sent, utilizing for resolving the module of pdf document described in browser, the pdf document received being resolved, thus realizes the online reading of pdf document.
But due to the restriction of the performance of mobile terminal own, low and middle-end mobile terminal does not generally possess the module for resolving pdf document, therefore cannot based on browser online reading pdf document.
Summary of the invention
In view of this, the invention provides a kind of methods, devices and systems for mobile terminal preview pdf document, even if make mobile terminal not possess module for resolving pdf document, also can based on browser online reading pdf document.
Technical scheme of the present invention is specifically achieved in that
For a method for mobile terminal preview pdf document, the method comprises:
The pdf document preview request that mobile terminal receive sends, obtains pdf document according to described preview request;
Described pdf document is converted to the picture of PPM form, the picture of described PPM form is converted to be carried in web page contents after the picture being suitable for Internet Transmission and reading described in being converted to is carried out packaged combination by the picture that is suitable for Internet Transmission and reading and issues mobile terminal;
Wherein, server receives the preview request of pdf document, after getting corresponding pdf document according to described preview request, further error correction is carried out to the actual format of pdf document, be about to be designated PDF but actual format is the file of the extended formatting beyond PDF, first be converted to the correct form corresponding to content of this file, and then according to this correct this file of form preview.
For a device for mobile terminal preview pdf document, this device receiver module, acquisition module, modular converter and sending module;
Described receiver module, for the pdf document preview request that mobile terminal receive sends;
Described acquisition module, for obtaining pdf document according to described preview request;
Described modular converter, for described pdf document being converted to the picture of PPM form, is converted to the picture of described PPM form the picture being suitable for Internet Transmission and reading;
Described sending module, is carried in web page contents after the picture for being suitable for Internet Transmission and reading described in being converted to by described modular converter carries out packaged combination and issues mobile terminal;
Wherein, server receives the preview request of pdf document, after getting corresponding pdf document according to described preview request, further error correction is carried out to the actual format of pdf document, be about to be designated PDF but actual format is the file of the extended formatting beyond PDF, first be converted to the correct form corresponding to content of this file, and then according to this correct this file of form preview.
For a system for mobile terminal preview pdf document, this system comprises mobile terminal and server;
Described mobile terminal, for sending pdf document preview request to server, receiving web page contents that described server sends and showing described web page contents, wherein, carrying with the PDF content of pages of graphic form display in described web page contents;
Described server, for the pdf document preview request that mobile terminal receive sends, obtain pdf document according to described preview request, described pdf document is converted to the picture of PPM form, the picture of described PPM form is converted to the picture being suitable for Internet Transmission and reading; Be carried in web page contents after the picture being suitable for Internet Transmission and reading described in being converted to is carried out packaged combination and issue mobile terminal;
Wherein, server receives the preview request of pdf document, after getting corresponding pdf document according to described preview request, further error correction is carried out to the actual format of pdf document, be about to be designated PDF but actual format is the file of the extended formatting beyond PDF, first be converted to the correct form corresponding to content of this file, and then according to this correct this file of form preview.
As seen from the above technical solution, the present invention is by being converted to picture format at server side by the pdf document of mobile terminal request preview, then the picture be converted to is carried in web page contents and issues mobile terminal, as long as make mobile terminal can browse webpage based on browser, even if do not possess the module for resolving pdf document, also can online reading pdf document.
Accompanying drawing explanation
Fig. 1 is the method flow diagram for mobile terminal preview pdf document provided by the invention.
Fig. 2 is the structure drawing of device for mobile terminal preview pdf document provided by the invention.
Fig. 3 is the system for mobile terminal preview pdf document provided by the invention composition schematic diagram.
Embodiment
Fig. 1 is the method flow diagram for mobile terminal preview pdf document provided by the invention.
As shown in Figure 1, the method comprises:
Step 101, the pdf document preview request that server mobile terminal receive sends.
Step 102, server obtains pdf document according to described preview request.
Step 103, the pdf document of acquisition is converted to picture by server.
In this step, first by scanning pdf document, thus described pdf document can be converted to the picture of PPM form, and then the picture of PPM form that will be converted to, be converted to the picture being applicable to the form transmitted in a network, the picture that required delivery flow rate such as such as JPEG etc. is less.
Step 104, the picture be converted to is carried in web page contents and issues mobile terminal by server.
Server is in the preview request according to mobile terminal, when pdf document is converted to picture, the pdf document at the pdf document page place of mobile terminal request preview can be determined, all pages of this pdf document are all converted to picture and store, then only picture corresponding for the pdf document page of mobile terminal current request preview is carried in web page contents and issues mobile terminal.Also can be only picture by the pdf document conversion of page of mobile terminal current request preview, this picture is carried in web page contents and issue mobile terminal.
Wherein, according to the release type of pdf document, the structure of pdf document can also be resolved, finds out the field of the total page number recording this pdf document, from described field, obtain the total page number information of PDF, described total page number information is carried in web page contents and issues mobile terminal.
Web page contents of the present invention, is generally HTML content.
In order to avoid there is information dropout in process pdf document being converted to picture, the configuration information of the conventional font of pdf document can also be installed in advance, then in the process that pdf document is scanned, search the configuration information of conventional font, thus the configuration information that the font finding current pdf document is corresponding, according to lookup result, pdf document is converted to the picture of PPM form.
In actual applications, following situation can be there is, namely server side stores, be designated the file of PDF type, its actual type may be the other types beyond PDF, such as, actual is word document etc., in order to strengthen System Error-tolerance Property, the present invention also proposes, server receives the preview request of pdf document, after getting corresponding pdf document according to described preview request, further error correction is carried out to the actual format of pdf document, be about to be designated PDF, but actual format is the file of the extended formatting beyond PDF, first be converted to the correct form corresponding to content of this file, and then according to this correct this file of form preview.
Below in conjunction with concrete example, carry out exemplary introduction to specific implementation of the present invention in practical application, given example is not limited to the present invention.
Because the function of Xpdf reader is comparatively powerful, the functions such as scanning, the extraction of PDF text, PDF text-converted can be realized, therefore, can adopt Xpdf reader that described pdf document is converted to the picture of PPM form.Particularly, the preview request of pdf document can be monitored at server end, the read request of such as pdf document, according to the URL carried in this preview request, get corresponding PDF packet, and at server end, the PDF conversion of page of preview user is asked to become the picture of PPM form, and then the picture of PPM form is converted to the picture being suitable for Internet Transmission and reading, the described picture being suitable for Internet Transmission and reading is carried out packaged combination, thus be carried in HTML content, described HTML content is returned to mobile terminal, mobile terminal is presented in HTML content based on web browser with the pdf document that graphic form exists.
When pdf document is converted to PPM picture by employing Xpdf reader, meeting seeking system font, therefore conventional PDF font must be installed here, then configuration file is write, carry out parameter call in a program, because the font that will install and configure is too many, only simply list the configuration of founder fonts, the Song typeface, regular script and associated clip here:
fontFileFZFSJW--GB1-0/usr/local/app/xpdf/fonts/FZFSJW.ttf
fontFileFZHTJW--GB1-0/usr/local/app/xpdf/fonts/FZHTJW.ttf
fontFileFZXBSJW--GB1-0/usr/local/app/xpdf/fonts/FZXBSJW.ttf
fontFileFZZYJW--GB1-0/usr/local/app/xpdf/fonts/FZZYJW.ttf
fontFileFZDBSJW--GB1-0/usr/local/app/xpdf/fonts/FZDBSJW.ttf
fontFileFZSSJW--GB1-0/usr/local/app/xpdf/fonts/FZSSJW.ttf
fontFileFZKTJW--GB1-0/usr/local/app/xpdf/fonts/FZKTJW.ttf
fontFileFZY4JW--GB1-0/usr/local/app/xpdf/fonts/FZY4JW.ttf
fontFileFZL2JW--GB1-0/usr/local/app/lokipeng/fonts/FZL2JW.ttf
FontFile regular script _ GB2312/usr/local/app/xpdf/fonts/KTGB2312.ttf
The fontFile Song typeface/usr/local/app/xpdf/fonts/ST.ttf
Installation Xpdf reader and the idiographic flow utilizing Xpdf reader to carry out pdf document conversion can comprise:
In the installation file of Xpdf reader, under entering into bin catalogue, the executable files such as pdfinfo, pdftoppm are copied service place bin catalogue, this is two executable files.
Under linux, operation shell-command ./pdftoppm-f1-l1 – cfg./xpdf-r150xx.pdf./will change the first page of pdf, xpdf wherein in-cfg./xpdf order refers to font configuration file, the font that seeking system is installed is gone when boot is changed by it, and then pdf document is scanned, generate corresponding PPM file;-f – l specifies the PDF that will change to start page number at and last page respectively;-r refers to scanning accuracy, and acquiescence is 150dpi, and the actual used time suitably can improve scanning accuracy.
Under linux, run the information such as version, total page number, creation-time, author that shell-command ./pdfinfoxx.pdf can see pdf document in standard output stream.During specific implementation, process can be started by pipeline, run pdfinfo order, write standard output stream toward pipeline, and finally read internal memory and search, thus find the information such as corresponding total page number.
Wherein, PDF total page number is obtained owing to running third party's instrument pdfinfo, may lead to the failure, therefore in order to not affect preview, need to do certain fault-tolerant, here mainly through analyzing each version pdf document structure, find out the relevant field of record pdf document total page number, and then obtain the total page number of PDF, such as, following rule can be adopted:
1) in the data stream of pdf document, to find shape as <</Type/Pages/Count50/Kids or <</Type/Pages/Count50/Kids word string, wherein 50 is exactly the total page number of this pdf document.
2) can not find <</Type/Pages/Count, then find shape as: <</Columns50/Predictor word string, wherein 50 is exactly total page number.
3) if the 2nd) step do not find total page number information yet, then in pdf document, carry out circulation searching, until occur shape as :/Count50/Kids ,/Count50 n/Kids ,/Count50>> ,/Count50 n>> ,/Count50 n/Rotate ,/Count50/Type word string, get and occur that non-zero numeral is as total page number for the first time, in the present example, total page number is 50.
According to said method provided by the invention, present invention also offers corresponding device and system, specifically refer to Fig. 2-Fig. 3.
Fig. 2 is the structure drawing of device for mobile terminal preview pdf document provided by the invention.
As shown in Figure 2, this device comprises receiver module 201, acquisition module 202, modular converter 203 and sending module 204.
Receiver module 201, for the pdf document preview request that mobile terminal receive sends.
Acquisition module 202, for obtaining pdf document according to described preview request.
Modular converter 203, for being converted to picture by described pdf document.
Sending module 204, the picture for being converted to by modular converter 203 is carried in web page contents issues mobile terminal.
Modular converter 203 wherein can comprise the first modular converter and the second modular converter.
Described first modular converter, for by scanning pdf document, is converted to the picture of PPM form by described pdf document.
Described second modular converter, for the picture by described PPM form, is converted to the picture being applicable to the form transmitted in a network.
Wherein, the first modular converter can comprise Xpdf reader.
This device can also comprise conventional font configuration module.
Described conventional font configuration module, stores the configuration information of the conventional font of pdf document.
Described first modular converter, for searching the configuration information of conventional font from described conventional font configuration module, according to lookup result, is converted to the picture of PPM form by described pdf document.
This device can also comprise total page number and search module.
Described total page number searches module, for the release type according to pdf document, resolves the structure of pdf document, finds out the field of the total page number recording this pdf document, obtain the total page number information of PDF from described field.
Sending module 204, issues mobile terminal for described total page number information being carried in web page contents.
Wherein, modular converter 203, may be used for the pdf document at the pdf document page place determining mobile terminal request preview, all pages of this pdf document is all converted to picture.
Sending module 204, may be used for picture corresponding for the pdf document page of mobile terminal request preview to be carried in web page contents to issue mobile terminal.
Fig. 3 is the system for mobile terminal preview pdf document provided by the invention composition schematic diagram.
As shown in Figure 3, this system comprises mobile terminal 301 and server 302.
Mobile terminal 301, for sending pdf document preview request to server, receiving web page contents that described server sends and showing described web page contents, wherein, carrying with the PDF content of pages of graphic form display in described web page contents.
Server 302, for the pdf document preview request that mobile terminal receive sends, obtains pdf document according to described preview request, described pdf document is converted to picture, is carried in web page contents by the picture be converted to and issues mobile terminal 301.
From such scheme, technical scheme provided by the invention, by pdf document being converted to picture format at browser backstage (i.e. server), particularly, by realizing the scanning to pdf document, thus pdf document is converted to PPM picture format, and be converted to the picture that JPEG etc. is adapted at transmission over networks reading further, then packaged combination is carried out to picture, and then generate the HTML content being applicable to user and browsing, described HTML content is sent to mobile terminal, mobile terminal thus can based on browser preview pdf document.
Technical scheme provided by the invention is suitable for the pdf document of any version, it achieve the online reading of pdf document, make the mobile terminals such as PC end and mobile phone terminal can carry out the synchronous of file, at PC end, pdf document is uploaded onto the server, then based on browser, online preview is carried out to pdf document at mobile phone terminal, even if the mobile phone of user does not possess the function of resolving pdf document, user also can be allowed to read pdf document anywhere or anytime.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (12)
1. for a method for mobile terminal preview pdf document, it is characterized in that, the method comprises:
The pdf document preview request that mobile terminal receive sends, obtains pdf document according to described preview request;
Described pdf document is converted to the picture of PPM form, the picture of described PPM form is converted to the picture being suitable for Internet Transmission and reading; Be carried in web page contents after the picture being suitable for Internet Transmission and reading described in being converted to is carried out packaged combination and issue mobile terminal;
Wherein, server receives the preview request of pdf document, after getting corresponding pdf document according to described preview request, further error correction is carried out to the actual format of pdf document, be about to be designated PDF but actual format is the file of the extended formatting beyond PDF, first be converted to the correct form corresponding to content of this file, and then according to this correct this file of form preview.
2. method according to claim 1, is characterized in that, is comprised by the picture that described pdf document is converted to PPM form:
Xpdf reader is adopted described pdf document to be converted to the picture of PPM form.
3. method according to claim 1, is characterized in that, the method also comprises: the configuration information installing the conventional font of pdf document in advance;
The picture that described pdf document is converted to PPM form is comprised:
In the process that described pdf document is scanned, search the configuration information of described conventional font, according to lookup result, described pdf document is converted to the picture of PPM form.
4. method according to claim 1, is characterized in that, the method also comprises:
According to the release type of pdf document, resolve the structure of pdf document, find out the field of the total page number recording this pdf document, from described field, obtain the total page number information of PDF, described total page number information is carried in web page contents and issues mobile terminal.
5. method according to claim 1, is characterized in that, described pdf document is converted to picture and comprises:
Determine the pdf document at the pdf document page place of mobile terminal request preview, all pages of this pdf document are all converted to picture;
The picture be converted to is carried in web page contents and issues mobile terminal and comprise:
Picture corresponding for the pdf document page of mobile terminal request preview is carried in web page contents and issues mobile terminal.
6. for a device for mobile terminal preview pdf document, it is characterized in that, this device is arranged in server, comprises receiver module, acquisition module, modular converter and sending module;
Described receiver module, for the pdf document preview request that mobile terminal receive sends;
Described acquisition module, for obtaining pdf document according to described preview request;
Described modular converter, for described pdf document being converted to the picture of PPM form, is converted to the picture of described PPM form the picture being suitable for Internet Transmission and reading;
Described sending module, is carried in web page contents after the picture for being suitable for Internet Transmission and reading described in being converted to by described modular converter carries out packaged combination and issues mobile terminal;
Wherein, server receives the preview request of pdf document, after getting corresponding pdf document according to described preview request, further error correction is carried out to the actual format of pdf document, be about to be designated PDF but actual format is the file of the extended formatting beyond PDF, first be converted to the correct form corresponding to content of this file, and then according to this correct this file of form preview.
7. device according to claim 6, is characterized in that, described modular converter comprises the first modular converter and the second modular converter;
Described first modular converter, for by scanning pdf document, is converted to the picture of PPM form by described pdf document;
Described second modular converter, for the picture by described PPM form, is converted to the picture being applicable to transmitting in a network and reading.
8. device according to claim 7, is characterized in that, described first modular converter comprises Xpdf reader.
9. device according to claim 7, is characterized in that, this device also comprises conventional font configuration module;
Described conventional font configuration module, stores the configuration information of the conventional font of pdf document;
Described first modular converter, for searching the configuration information of conventional font from described conventional font configuration module, according to lookup result, is converted to the picture of PPM form by described pdf document.
10. device according to claim 6, is characterized in that, this device also comprises total page number and searches module;
Described total page number searches module, for the release type according to pdf document, resolves the structure of pdf document, finds out the field of the total page number recording this pdf document, obtain the total page number information of PDF from described field;
Described sending module, issues mobile terminal for described total page number information being carried in web page contents.
11. devices according to claim 6, is characterized in that,
All pages of this pdf document, for determining the pdf document at the pdf document page place of mobile terminal request preview, are all converted to picture by described modular converter;
Described sending module, is carried in web page contents for the picture that the pdf document page by mobile terminal request preview is corresponding and issues mobile terminal.
12. 1 kinds, for the system of mobile terminal preview pdf document, is characterized in that, this system comprises mobile terminal and server;
Described mobile terminal, for sending pdf document preview request to server, receiving web page contents that described server sends and showing described web page contents, wherein, carrying with the PDF content of pages of graphic form display in described web page contents;
Described server, for the pdf document preview request that mobile terminal receive sends, obtain pdf document according to described preview request, described pdf document is converted to the picture of PPM form, the picture of described PPM form is converted to the picture being suitable for Internet Transmission and reading; Be carried in web page contents after the picture being suitable for Internet Transmission and reading described in being converted to is carried out packaged combination and issue mobile terminal;
Wherein, server receives the preview request of pdf document, after getting corresponding pdf document according to described preview request, further error correction is carried out to the actual format of pdf document, be about to be designated PDF but actual format is the file of the extended formatting beyond PDF, first be converted to the correct form corresponding to content of this file, and then according to this correct this file of form preview.
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