CN101437044B - Method and system for downloading file by point-to-point network technique based on sliced sheet - Google Patents
Method and system for downloading file by point-to-point network technique based on sliced sheet Download PDFInfo
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- CN101437044B CN101437044B CN2008101793429A CN200810179342A CN101437044B CN 101437044 B CN101437044 B CN 101437044B CN 2008101793429 A CN2008101793429 A CN 2008101793429A CN 200810179342 A CN200810179342 A CN 200810179342A CN 101437044 B CN101437044 B CN 101437044B
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Abstract
The invention discloses a slice-based file download method for point-to-point network technology and a system thereof. The method comprises: when a client carries out point-to-point download, creating and maintaining local record information indicating whether slice contents of a file to be downloaded exist at the current node or not; acquiring record information maintained by dynamic nodes from friendly nodes, wherein the record information indicates whether the slice contents of the file to be downloaded exist in the dynamic nodes or not; in the download process, carrying out real time updating of record information of the current node and the dynamic nodes in the download process; comparing the record information of the current node with the record information of the dynamic nodes, determining friendly nodes containing the slice contents which are not downloaded and sending requests for downloading the data to be downloaded to the friendly nodes; dividing the downloaded file by the slice contents according to the set slice length to obtain parts which represent a slice content each. The invention can use a broadband resource to the maximum degree.
Description
Technical field
The present invention relates to network communications technology field, more particularly, relate to a kind of P2P (Peer-to-peer, point to point network technology) document down loading method and system thereof based on section.
Background technology
The P2P download technology is the download solution of present comparative maturity.The download tool of current trend also increases the support that P2P is downloaded one after another, like a sudden peal of thunder, flash get etc.The characteristics that P2P downloads are to fetch data from a plurality of points simultaneously, and simultaneously data are provided externally and well-known.The processing of this peer-to-peer network makes that the flow of the Internet is soaring year by year in recent years, has caused the very big concern of telecommunications manufacturer.
But, how effectively to control the transmission quantity of invalid data, utilize broadband resource to greatest extent, be a problem demanding prompt solution.In addition, present P2P network is unordered, is uncontrollable, and the P2P flow has accounted for the very big proportion of network traffics.
Summary of the invention
It is a kind of based on the point to point network of section technological document down loading method and system that the technical problem that the present invention solved is to provide, and can utilize broadband resource to greatest extent.
In order to address the above problem, the invention provides a kind of document down loading method based on the point to point network technology of cutting into slices, comprising:
When client is carried out point-to-point download; The recorded information that whether the section content of establishment and maintenance expression file in download exists at this node in this locality; Dynamic node from friendly node obtains the recorded information whether the section content of the expression file in download that each dynamic node safeguards exists at this dynamic node; The recorded information of this node of real-time update and dynamic node in downloading process; With the recorded information of the recorded information of this node and dynamic node relatively, confirm to comprise the friendly node of not downloading the section content and want data downloaded to these friendly node requests;
Said section content refers to by the slice length of setting file in download divided the various piece that obtains, and each part is a section content.
Method of the present invention; Wherein, Said section content is carried out actual slice and is obtained; Promptly by the slice length of setting to the partial document content that file in download is actual to be obtained after cutting apart, be added with the index information of this section content in each section content, and the file after will cutting into slices is as file in download; Perhaps
Said section content is carried out the logic section and is obtained; Promptly calculate the number of sections of file in download by the slice length of setting; The partial document content of relevant position in the file in download that each section content corresponds to; After said friendly node is received the request of said client downloads section, redispatch to said client after reading the content of relevant position and adding the index information of representing this section content.
Further; Wherein, Before offering client downloads; Elder generation carries out actual slice or logic section to file in download and generates the section description document of this file in download; The information and concentrate that this section description document comprises identification information and the section content quantity of this file in download is kept in the management equipment, and said client obtains the section description document of file in download and creates the recorded information whether this file in download section content exists in this locality according to number of sections information wherein from this management equipment before download.
Further; Wherein, said section description document is generated by EPG management platform or section server, is kept in the electronic program guide (EPG) management platform; The file in download unification is preserved the deployment of the static node of file in download and is also managed by this EPG management platform by the management of EPG management platform.
Further; Wherein, Said recorded information is one or more bitmap bitmap; Among the said bitmap each is corresponding to a section content, and whether the section content that its value representation is corresponding exists at this node, and the bitmap of the file in download that static node is safeguarded is defaulted as has the value that all section contents of expression all exist.
Further, wherein, said actual slice or logic section are to be divided into one or more snippets by the big young pathbreaker's file in download of the section of setting, and each dynamic node is safeguarded a bitmap for the part of publishing papers once, and each is corresponding to the one piece of data in the file in download among this bitmap;
In downloading process; Dynamic node in the said friendly node regularly sends its current bitmap to said client; Said client is received these dynamic nodes bitmap corresponding with said file in download that the back renewal is preserved; Simultaneously, said client is the corresponding already present value of section content of expression with the corresponding position of this bitmap after one piece of data is downloaded completion.
Further, wherein,
Said actual slice or logic section are to be divided into one or more snippets by the big young pathbreaker's file in download of the section of setting earlier, again final stage are divided into one or more; Each dynamic node is safeguarded two bitmaps for the part of publishing papers once, and each is corresponding to the one piece of data in the file in download among the bitmap, and each is corresponding to the blocks of data in the file in download final stage among the 2nd bitmap;
In downloading process; Said client a bitmap and the 2nd bitmap of the said file in download of dynamic node request in friendly node respectively when beginning to download and will download the final stage data; Said dynamic node is after receiving the request of said client to a bitmap; Regularly send the current bitmap of this file in download in this node to said client, said client receives that the back upgrades this bitmap of this dynamic node of preserving; Simultaneously, said client is upgraded the value of the corresponding position of a bitmap after one piece of data is downloaded completion, after blocks of data download is accomplished, upgrades the 2nd bitmap value of position accordingly.
Further, wherein,
Said actual slice or logic section are to be divided into one or more snippets by the big young pathbreaker's file in download of the section of setting earlier, and every section is divided into polylith by the block size of setting again, and each dynamic node is that each segment data of file in download is safeguarded a bitmap;
In downloading process; Equal bitmap of this segment data once of the dynamic node request in said friendly node earlier when client will be downloaded every segment data, then according to the bitmap of this segment data of local and friendly node to having the corresponding blocks of data of friendly node request that will download blocks of data.
In order to address the above problem, the present invention also provides a kind of and has comprised the static node and the client that are connected through network based on the technological file download system of the point to point network of section, it is characterized in that:
Said client comprises:
The recorded information maintenance module; Be used for when point-to-point download; The recorded information that whether the section content of establishment and maintenance expression file in download exists in this locality in this locality; Dynamic node from friendly node obtains the recorded information whether the section content of the expression file in download that each dynamic node safeguards exists at this dynamic node, the recorded information of this node of real-time update and dynamic node in downloading process, and can feed back the recorded information of local maintenances according to other node requests; Said section content refers to by the slice length of setting file in download divided the various piece that obtains, and each part is a section content;
File download process module; Be used for the recorded information of this node and the recorded information of dynamic node are compared; Confirm to comprise the friendly node of not downloading the section content, and want data downloaded, after all section contents are downloaded successfully, stop to download to these friendly node requests;
Said static node is used to preserve the full content of file in download.
File download system of the present invention wherein, also comprises a section equipment and a management equipment, wherein:
Said chopper and slicer is used for file in download is cut into slices; Generate the section description document of this file in download; The information that comprises the identification information and the section content quantity of this file in download in this section description document; Said section refers to by the slice length of setting file in download carried out the actual index information that is added with this section in respectively cut into slices content and each the section content of cutting apart; Perhaps refer to calculate by the slice length of setting the number of sections of file in download, each section corresponds to the partial document content of relevant position in the file in download;
Said management equipment is used to preserve said section description document, and according to the request of client the section description document of request file in download is sent to said client.
Further, wherein,
The recorded information of said client maintenance is one or more bitmap bitmap, and each among the said bitmap is corresponding to a section content, and whether the section content that its value representation is corresponding exists at this node;
The bitmap of the file in download that said static node is safeguarded is defaulted as has the value that all section contents of expression all exist.
Compared with prior art, the present invention carries out file based on section and downloads through file in download is carried out slicing treatment; Reduced the expense that is used to indicate the information whether the section content exist; Can alleviate network burden, utilize bandwidth resources better, improve the speed of download and the rate of sharing.Further, the unordered and uncontrollable state that can also avoid P2P to download.
Description of drawings
Fig. 1 is the structured flowchart of first embodiment of the invention system;
Fig. 2 is the flow chart of first embodiment of the invention method.
Embodiment
The present invention carries out cutting to the needs downloaded files; Each client is safeguarded the recorded information whether local this document section content exists according to the file slice information, and the client that this document is downloaded in request is then sent request of data according to this recorded information that this locality and institute's requesting client are returned.Because with the section is that unit representes having or not of file content, can practices thrift the expense that transmits the indication information of representing that file content has or not, thereby utilize bandwidth resources better.
Below embodiment is described in detail, but not as to qualification of the present invention.
First embodiment
Fig. 1 shows the structured flowchart of present embodiment system; Comprise the client 201, electronic program guides (EPG) management platform 202, district management server 204 and the static node 205 that connect through network; Also comprise the section server 203 that links to each other with EPG management platform 202, the server of cutting into slices certainly also can be directly connected on the said network to communicate by letter with the EPG management platform.In the present embodiment, file to be downloaded (or being called film source) is unified to be managed by EPG, and the deployment of static node is also managed by EPG, controlled to realize P2P's.Through the EPG unified management, it is orderly by unordered change that P2P is downloaded.Client generally belongs to dynamic node in the said system that P2P downloads.
Said client comprises:
The recorded information maintenance module; Be used for when point-to-point download; The recorded information that whether the section content of establishment and maintenance expression file in download exists in this locality in this locality; Dynamic node from friendly node obtains the recorded information whether the section content of the expression file in download that each dynamic node safeguards exists at this dynamic node, the recorded information of this node of real-time update and dynamic node in downloading process, and can feed back the recorded information of local maintenances according to other node requests; Said section content refers to by the slice length of setting file in download divided the various piece that obtains, and each part is a section content;
File download process module; Be used for the recorded information of this node and the recorded information of dynamic node are compared; Confirm to comprise the friendly node of not downloading the section content, and want data downloaded, after all section contents are downloaded successfully, stop to download to these friendly node requests;
In the present embodiment, the recorded information of client maintenance is one or more bitmap bitmap, and each among the said bitmap is corresponding to a section content, and whether the section content that its value representation is corresponding exists at this node.
Said static node is used to preserve the full content of file in download, and the bitmap of the file in download that said in the present embodiment static node is safeguarded is defaulted as has the value that all section contents of expression all exist.
Said section server (also can be other chopper and slicers) is used for file in download is cut into slices; Generate the section description document of this file in download; The information that comprises the identification information and the section content quantity of this file in download in this section description document; Said section refers to by the slice length of setting file in download carried out the actual index information that is added with this section in respectively cut into slices content and each the section content of cutting apart; Perhaps said section refers to calculate by the slice length of setting the number of sections of file in download, and the partial document content of relevant position in the file in download that corresponds to of each section.
Said EPG management platform (also can be other management equipments) is used to preserve said section description document, and according to the request of client the section description document of request file in download is sent to said client.
The concrete realization of above function can be with reference to following flow process.
As shown in Figure 2, be the flow process of present embodiment based on the document down loading method of the point to point network technology (P2P) of section, present embodiment is to be that unit comes the cutting file with the section, concrete steps comprise:
Step 101, the section server is the content source sign from file and the cid information thereof that the EPG management platform obtains slice, and the size information of filename of this document and section;
The size information of section also can directly be configured in the section server.
File after the section includes the plurality of sections data, and each segment data head is added with and is used to represent the index information of this segment data for which section.
More than three the step be slicing processes.Carry out obtaining actual cutting apart, this section also can be accomplished in the EPG management platform, also can only carry out logic section (seeing second embodiment).In addition, above-mentioned EPG management platform can replace with other management platform or application server.
The figure place of this bitmap equals the hop count in the file slice information, and each is used to represent whether corresponding section exists, and exists as represent this segment data with " 1 ", and " 0 " expression does not exist.In the dynamic node of each client or other types, all adopt the bitmap that identical mode is safeguarded file in download.And preserved all sections of file in download in the static node, so everybody of its bitmap is " 1 ".
Step 109, after the district management server is received query requests, inquiry obtain having this file in download friendly node information and return to client;
The information that this inquiry obtains comprises friendly address of node information, and present embodiment also comprises the whether information etc. of static node of friendly node.
The above-mentioned zone management server not necessarily, friendly node also can obtain the information of friendly node through other modes.The present invention does not do qualification to this.
For example, 3 friendly nodes are arranged, first friendly node has all 1～9 segment datas of this file in download; Second friendly node has 3～5 segment datas, and the 3rd friendly node has 2～6 segment datas, so; Client can be to the data of the 1st section of first friendly node request wherein; To the data of the 3rd section of second friendly node request,, and download at certain friendly node and to accomplish the segment data that continued please be looked for novelty to the data of the 2nd section of the 3rd friendly node request.
Here the segment data of returning includes the index information which section expression is, which segment data what client can be judged download according to this information is.
Simultaneously; Dynamic node in the friendly node is after the bitmap request of receiving client; Can regularly send the current bitmap of this file in download in this node to this client; Up to download accomplishing, client is received the bitmap that can upgrade the corresponding friendly node of preserving behind the bitmap that friendly node sends;
During segment data that client continues to look for novelty, based on the bitmap of this node and friendly node confirm the friendly node that will ask and the segment data that will ask.
Step 119, the bitmap of client terminal local is 1 o'clock entirely, downloads and accomplishes.
Second embodiment
Present embodiment is to come the cutting file with section earlier, is that unit comes cutting again with the piece to final stage, and some differences are correspondingly arranged on handling process, and concrete steps are following:
Step 1; The section server is obtained the content source sign (CID) of file in download and the size information of file in download from the EPG management platform; According to the size information of file in download and the pre-configured section and the size of piece; File in download is carried out logic section promptly calculate the piece number that hop count that the file slice information is a file in download and final stage comprise; Generate then that to comprise this file in download CID (or other signs) be the DES file with the section description document of file slice information, the section description document that the server of cutting into slices will generate returns to the EPG management platform and preserves;
In the present embodiment, this section description document can be the XML form.In addition; Also can upgrade to the EPG management platform makes it have the section function, promptly in other embodiments, and also can be in inner this slicing treatment of accomplishing of EPG management platform; The EPG management platform only need be known the section of configuration and the size of piece, just can generate corresponding switching description document.
Step 2; After client receives the instruction of user's download file; Obtain the section description document of this file in download from the EPG management platform; Parse wherein CID and file slice information, to the request that the district management server sends the CID that carries this file in download, inquiry has the friendly address of node information of this file in download;
The friendly nodal information that step 3, district management server will inquire returns to client;
Step 4, client generates two bitmap (bitmap) based on hop count in the file slice information that parses and the piece number in the final stage in this locality, and sends the request to a bitmap based on the friendly nodal information of receiving to friendly node;
In the present embodiment, the figure place of a bitmap equals the hop count in the file slice information, and each is used to represent whether corresponding section exists; The figure place of the 2nd bitmap equals the piece number of final stage in the file slice information, and each is used to represent whether corresponding piece exists.
Step 5, after friendly node was received described request, a bitmap of this file in download of in response, this node being preserved sent to this client;
After step 6, client receive a bitmap of this node that friendly node returns, with the section be earlier unit to friendly node request msg, friendly node receives that this request then sends corresponding segment data to client;
Client compares according to the bitmap of this file in download this locality and the bitmap of each friendly node, and judge the current segment data that will download and in which friendly node, exist, be that unit asks corresponding data respectively to these friendly nodes then with the section.Such as the 1st, 2,3 sections segment data when beginning, can asking this file in download to 3 friendly nodes respectively.
Friendly node should be done encapsulation when client delivery section data, in packet header, add to be used to represent to be the index information of which segment data.
Step 7; Client receives the segment data of downloading from friendly node; Be saved in the disk file of this client; And upgrade the logical value of a local bitmap, promptly when the corresponding segment data in a certain position among this bitmap download will this position after accomplishing logical value be changed to 1, client according to the bitmap continuation of this node and friendly node to friendly node request segment data;
Simultaneously; Because the data of this file in download that friendly node is preserved are also in real-time change; And the downloading process of segment data maybe be longer; Therefore friendly node can regularly send the current bitmap of this file in download in this node to this client after receiving the request of client to a bitmap, and client receives that the back upgrades this bitmap of the corresponding friendly node preserved.Client at every turn when friendly node request msg, all according to the last look of a bitmap of this node and friendly node confirm the friendly node that will ask and the segment data that will ask.
Step 8 when client will be downloaded the segment data of final stage, is sent the request to the 2nd bitmap to friendly node;
Step 9, after friendly node was received described request, the 2nd bitmap of this file in download of in response, this node being preserved sent to this client;
After step 10, client receive the 2nd bitmap of this node that friendly node returns, with the piece be unit to friendly node request msg with final stage data, friendly node receives that this request back sends corresponding blocks of data to client;
In the present embodiment, because be the logic section, after friendly node is received the request of said client downloads section, redispatch to said client after must reading the content of relevant position and adding the index information of representing this section.
For example; There are 3 friendly nodes to have the data of this file in download final stage; Final stage comprises 9 pieces; Client can be to the data of the 1st～3 of first friendly node request wherein, to the data of the 4th～6 of second friendly node request, to the data of the 7th～9 of the 3rd friendly node request.
Step 11; Client receives the blocks of data of downloading from friendly node; Be saved in the disk file of this client, and upgrade the logical value of the 2nd local bitmap, logical value that promptly will this position after the corresponding blocks of data in a certain position is downloaded completion among this bitmap is changed to 1; First logical value with all position of the 2nd bitmap in this file in download of client terminal local is 1 o'clock entirely, and this document download to be accomplished.
Among this embodiment, if client knows that certain friendly node is a static node, also can be when file in download not to this static node request bitmap, directly think this static node always have the data of all sections that will download.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
For example, also can section file be cut into slices, and every section all cut into slices by piece again, is bitmap of each segment data maintenance of file in download in each dynamic node for unit.In downloading process, client can be when downloading every segment data equal bitmap of this section once of the dynamic node request in friendly node earlier, then based on the bitmap of this locality and friendly node to the corresponding blocks of data of friendly node request with blocks of data.Be equivalent to like this be divided into repeatedly transmission to a big bitmap in proper time point, can practice thrift the expense of each transmission, friendly in this case node can not need timing automatic to return its bitmap information to client.
And for example, the EPG management platform is not to be necessary, can adopt other device to preserve the section descriptor of file in download yet.Even the also section descriptor of spanned file not; Each client can dispose the size of the section of obtaining and/or piece according to system configuration or according to the user; Can confirm the starting and ending position of corresponding section according to the size of this section and/or piece; Also just can correctly generate corresponding bitmap information, so also can reach the purpose of conserve bandwidth.
Claims (11)
1. document down loading method based on the point to point network technology of section comprises:
When client is carried out point-to-point download; The recorded information that whether the section content of establishment and maintenance expression file in download exists at this node in this locality; Dynamic node from friendly node obtains the recorded information whether the section content of the expression file in download that each dynamic node safeguards exists at this dynamic node; The recorded information of this node of real-time update and dynamic node in downloading process; With the recorded information of the recorded information of this node and dynamic node relatively, confirm to comprise the friendly node of not downloading the section content and want data downloaded to these friendly node requests;
Said section content refers to by the slice length of setting file in download divided the various piece that obtains, and each part is a section content;
Wherein, said friendly node comprises dynamic node and static node, and said static node is used to preserve the full content of file in download.
2. the method for claim 1 is characterized in that:
Said section content is carried out actual slice and is obtained; Promptly by the slice length of setting to partial document content that file in download is actual to be obtained after cutting apart; Be added with the index information of this section content in each section content, and the file after will cutting into slices is as file in download; Perhaps
Said section content is carried out the logic section and is obtained; Promptly calculate the number of sections of file in download by the slice length of setting; The partial document content of relevant position in the file in download that each section content corresponds to; After said friendly node is received the request of said client downloads section, redispatch to said client after reading the content of relevant position and adding the index information of representing this section content.
3. method as claimed in claim 2 is characterized in that:
Before offering client downloads; Elder generation carries out actual slice or logic section to file in download and generates the section description document of this file in download; The information and concentrate that this section description document comprises identification information and the section content quantity of this file in download is kept in the management equipment, and said client obtains the section description document of file in download and creates the recorded information whether this file in download section content exists in this locality according to number of sections information wherein from this management equipment before download.
4. method as claimed in claim 3 is characterized in that:
Said section description document is generated by EPG management platform or section server, is kept in the electronic program guide (EPG) management platform, and the file in download unification is preserved the deployment of the static node of file in download and also managed by this EPG management platform by the management of EPG management platform.
5. like claim 2 or 3 or 4 described methods, it is characterized in that:
Said recorded information is one or more bitmap bitmap; Among the said bitmap each is corresponding to a section content; Whether the section content that its value representation is corresponding exists at this node, and the bitmap of the file in download that static node is safeguarded is defaulted as has the value that all section contents of expression all exist.
6. method as claimed in claim 5 is characterized in that:
Said actual slice or logic section are to be divided into one or more snippets by the big young pathbreaker's file in download of the section of setting, and each dynamic node is safeguarded a bitmap for the part of publishing papers once, and each is corresponding to the one piece of data in the file in download among this bitmap;
In downloading process; Dynamic node in the said friendly node regularly sends its current bitmap to said client; Said client is received these dynamic nodes bitmap corresponding with said file in download that the back renewal is preserved; Simultaneously, said client is expressed as the corresponding already present value of section content with the corresponding position of this bitmap after one piece of data is downloaded completion.
7. method as claimed in claim 5 is characterized in that:
Said actual slice or logic section are to be divided into one or more snippets by the big young pathbreaker's file in download of the section of setting earlier, again final stage are divided into one or more; Each dynamic node is safeguarded two bitmaps for the part of publishing papers once, and each is corresponding to the one piece of data in the file in download among the bitmap, and each is corresponding to the blocks of data in the file in download final stage among the 2nd bitmap;
In downloading process; Said client a bitmap and the 2nd bitmap of the said file in download of dynamic node request in friendly node respectively when beginning to download and will download the final stage data; Said dynamic node is after receiving the request of said client to a bitmap; Regularly send the current bitmap of this file in download in this node to said client, said client receives that the back upgrades this bitmap of this dynamic node of preserving; Simultaneously, said client is upgraded the value of the corresponding position of a bitmap after one piece of data is downloaded completion, after blocks of data download is accomplished, upgrades the 2nd bitmap value of position accordingly.
8. method as claimed in claim 5 is characterized in that:
Said actual slice or logic section are to be divided into one or more snippets by the big young pathbreaker's file in download of the section of setting earlier, and every section is divided into polylith by the block size of setting again, and each dynamic node is that each segment data of file in download is safeguarded a bitmap;
In downloading process; Equal bitmap of this segment data once of the dynamic node request in said friendly node earlier when client will be downloaded every segment data, then according to the bitmap of this segment data of local and friendly node to having the corresponding blocks of data of friendly node request that will download blocks of data.
9. the file download system based on the point to point network technology of section comprises the static node and the client that are connected through network, it is characterized in that:
Said client comprises:
The recorded information maintenance module; Be used for when point-to-point download; The recorded information that whether the section content of establishment and maintenance expression file in download exists in this locality in this locality; Dynamic node from friendly node obtains the recorded information whether the section content of the expression file in download that each dynamic node safeguards exists at this dynamic node, the recorded information of this node of real-time update and dynamic node in downloading process, and can feed back the recorded information of local maintenances according to other node requests; Said section content refers to by the slice length of setting file in download divided the various piece that obtains, and each part is a section content;
File download process module; Be used for the recorded information of this node and the recorded information of dynamic node are compared; Confirm to comprise the friendly node of not downloading the section content, and want data downloaded, after all section contents are downloaded successfully, stop to download to these friendly node requests;
Wherein, said friendly node comprises dynamic node and static node, and said static node is used to preserve the full content of file in download.
10. file download system as claimed in claim 9 is characterized in that, also comprises a section equipment and a management equipment, wherein:
Said chopper and slicer is used for file in download is cut into slices; Generate the section description document of this file in download; The information that comprises the identification information and the section content quantity of this file in download in this section description document; Said section refers to by the slice length of setting file in download carried out the actual index information that is added with this section in respectively cut into slices content and each the section content of cutting apart; Perhaps refer to calculate by the slice length of setting the number of sections of file in download, each section corresponds to the partial document content of relevant position in the file in download;
Said management equipment is used to preserve said section description document, and according to the request of client the section description document of request file in download is sent to said client.
11., it is characterized in that like claim 9 or 10 described file download systems:
The recorded information of said client maintenance is one or more bitmap bitmap, and each among the said bitmap is corresponding to a section content, and whether the section content that its value representation is corresponding exists at this node;
The bitmap of the file in download that said static node is safeguarded is defaulted as has the value that all section contents of expression all exist.
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| CN2008101793429A CN101437044B (en) | 2008-11-28 | 2008-11-28 | Method and system for downloading file by point-to-point network technique based on sliced sheet |
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| CN2008101793429A CN101437044B (en) | 2008-11-28 | 2008-11-28 | Method and system for downloading file by point-to-point network technique based on sliced sheet |
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| CN101437044B true CN101437044B (en) | 2012-05-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102055777A (en) * | 2009-10-29 | 2011-05-11 | 中兴通讯股份有限公司 | Method and system for realizing common content sharing service |
| CN102065113A (en) * | 2009-11-16 | 2011-05-18 | 北大方正集团有限公司 | Method and system for accelerating to upload files |
| CN101848232B (en) * | 2010-03-25 | 2013-03-06 | 清华大学 | Multi-viewpoint video transmission device based on P2P (peer to peer) technology |
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