CN104767801A - Two-thread ftp transmission method and system - Google Patents
Two-thread ftp transmission method and system Download PDFInfo
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- CN104767801A CN104767801A CN201510128007.6A CN201510128007A CN104767801A CN 104767801 A CN104767801 A CN 104767801A CN 201510128007 A CN201510128007 A CN 201510128007A CN 104767801 A CN104767801 A CN 104767801A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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Abstract
The invention provides a two-thread ftp transmission method and system. The method comprises the steps that all bytes of an original file are arranged from last data to first data, and an inverted file is obtained; according to a first thread, the original file is read from the first data of the original file; according to a second thread, the inverted file is read from the first data of the inverted file; whether the sum of file data read in the first thread and file data read in the second thread is larger than or equal to the size of the original file is judged, and when it is judged that the sum of the read data is larger than or equal to the size of the original file, the first thread and the second thread are stopped; the file data read in the first thread and the second thread are combined to form a transmission file. The CPU resources of a client side are saved to the maximum extent, the control process is simple, the downloading position is prevented from being frequently switched, a RESET instruction is prevented from being called, and fast transmission of a two-thread ftp is achieved.
Description
Technical field
The present invention relates to the Internet file host-host protocol applied technical field, particularly relate to transmission method and the system of a kind of two thread ftp.
Background technology
File transfer protocol (FTP) ftp (File Transfer Protocol) is one of important application of current network service, it achieves function that is reliable and effectively transmission data; Simultaneously, ftp has another outstanding advantage: as long as the system of carrying out file transfer all supports ftp agreement, just can carry out file transfer easily between dissimilar computer, make user can not be influenced because of the difference of all kinds of Hosts file accumulator system.Therefore, ftp is widely used service on Internet always.
Two traditional thread ftp download and the ftp method for down loading of multithreading is similar, namely following scheme is adopted to realize the download of file: first thread is downloaded from file start-position, second thread downloads original position by rest instruction adjustment, downloads in the middle of file some positions.
Inventor is realizing in process of the present invention, finds at least there is following problem in prior art:
Prior art does not support REST instruction at some ftp server, the traditional ftp server disposed more particularly, and in this case, two threads are downloaded and just cannot be achieved.
For the server supporting REST instruction, the speed downloaded due to two threads usually has certain difference, has one first to download, after having downloaded, this thread can not free, can only again by calculating, never download the position that in part, searching one is suitable, then start again in this position to download, after certain hour, have again one in these two threads first to finish the work, this is first finished the work, and needs again by calculating, adjustment position, start again to download, control procedure more complicated.
Getting from ftp server due to each, is all multiple byte, therefore each download adjustment position before, generally all transmit some bytes more, cause the wasting of resources.Such as, only differing from now a byte just needs adjustment position to know clearly, but server passes 100 bytes once, and then causes the waste of 99 bytes.
Summary of the invention
In view of the above problems, the present invention is proposed to provide a kind of transmission method of two thread ftp and the transmission system of corresponding two thread ftp that overcome the problems referred to above or solve or slow down the problems referred to above at least in part.
According to an aspect of the present invention, provide the transmission method of a kind of two thread ftp, the method comprises:
All bytes of original are arranged by from last data to the order of first data, obtains inverted file;
First thread reads described original from first data of described original;
Second thread reads described inverted file from first data of described inverted file;
Judge whether the file data sum of described first thread and described second thread reading is more than or equal to the size of described original, when the data sum of described reading is more than or equal to the size of described original, stops described first thread and the second thread;
The file data that described first thread and described second thread read is combined into transfer files.
Wherein, described method also comprises:
Be comprise inverted file catalogue corresponding to the original directory creating one of at least one original;
Will under at least one inverted file be stored in described inverted file catalogue one to one with at least one original described.
Wherein, the described file data by described first thread and described second thread reading is combined into transfer files, specifically comprises:
Create one and the onesize transfer files of described original;
First data of the corresponding described transfer files of first data in the file data that described first thread is read, the file data read with described first thread successively covers the Part I of described transfer files;
Last data of the corresponding described transfer files of first data in the file data that described second thread is read, the file data read with described second thread successively to cover in described transfer files the file data do not read by described first thread the Part II that covers.
Wherein, described method also comprises:
The file data that described first thread and described second thread read is buffered in internal memory, when the file data of buffer memory in described internal memory arrive preset data amount or transfer of data complete time, the file data of buffer memory in described internal memory is carried out the covering of described transfer files, the internal memory of release busy.
Wherein, described original and described inverted file are deployed on different disks.
According to another aspect of the present invention, provide the transmission system of a kind of two thread ftp, this system comprises:
Inverted file generation unit, for all bytes of original being arranged by from last data to the order of first data, obtains inverted file;
First thread reading unit, reads described original for the first thread from first data of described original;
Second thread reading unit, reads described inverted file for the second thread from first data of described inverted file;
Judging unit, for judging whether the file data sum of described first thread and described second thread reading is more than or equal to the size of described original, when the data sum of described reading is more than or equal to the size of described original, stop described first thread and the second thread;
Transfer files generation unit, is combined into transfer files for the file data described first thread and described second thread read.
Wherein, described system also comprises:
Inverted file directory creating unit, for the inverted file catalogue that the original directory creating one for comprising at least one original is corresponding;
Memory cell, for will under at least one inverted file be stored in described inverted file catalogue one to one with at least one original described.
Wherein, described transfer files generation unit comprises:
Transfer files creation module, for creating one and the onesize transfer files of described original;
First overlay module, for first data by the corresponding described transfer files of first data in the file data of described first thread reading, the file data read with described first thread successively covers the Part I of described transfer files;
Second overlay module, for last data of the corresponding described transfer files of first data in file data that described second thread is read, the file data read with described second thread successively to cover in described transfer files the file data do not read by described first thread the Part II that covers.
Wherein, described system also comprises:
Buffer unit, file data for described first thread and described second thread being read is buffered in internal memory, when the file data of buffer memory in described internal memory arrive preset data amount or transfer of data complete time, the file data of buffer memory in described internal memory is carried out the covering of described transfer files, the internal memory of release busy.
Wherein, described original and described inverted file are deployed on different disks.
Beneficial effect of the present invention is:
The transmission method of two thread ftp provided by the invention and system, for ftp client, avoid the document location scheduling of two thread complexity, can ensure that two threads terminate simultaneously; The present invention conveniently can carry out file deployment, and file corresponding for two threads is put into different disk, reduces access conflict, improves access efficiency; Avoid REST between server end and client mutual, what thus decrease between server end and client is mutual.The present invention, under the prerequisite of two threads, maximally make use of Internet resources, has maximally saved the cpu resource of client, and controls the simplest, avoids and calls REST instruction and frequent switching position.And the present invention can also be applicable to the ftp server not supporting REST instruction, and do not need the code changing ftp server.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the present invention, in the accompanying drawings:
The schematic flow sheet of the transmission method of a kind of two thread ftp that Fig. 1 provides for the embodiment of the present invention;
The segmentation flow chart of step S15 in the transmission method of a kind of two thread ftp that Fig. 2 provides for another embodiment of the present invention;
The structured flowchart of the transmission system of a kind of two thread ftp that Fig. 3 provides for the embodiment of the present invention; And
The internal structure block diagram of transfer files generation unit in the transmission system of a kind of two thread ftp that Fig. 4 provides for another embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The flow chart of the transmission method of a kind of two thread ftp that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1, the method comprises the following steps:
S11, all bytes of original to be arranged by from last data to the order of first data, obtain inverted file;
S12, the first thread read described original from first data of described original;
S13, the second thread read described inverted file from first data of described inverted file;
S14, judge whether the file data sum that described first thread and described second thread read is more than or equal to the size of described original, when the data sum of described reading is more than or equal to the size of described original, stops described first thread and the second thread;
S15, by described first thread and described second thread read file data be combined into transfer files.
Further, the transmission method of a kind of two thread ftp that the embodiment of the present invention provides also comprises:
Be comprise inverted file catalogue corresponding to the original directory creating one of at least one original;
Will under at least one inverted file be stored in described inverted file catalogue one to one with at least one original described.
In the embodiment of the present invention, ftp server, to the file under ftp catalogue, prepares two catalogues at server end.Such as, file directory is as follows :/file_server/download/, as original catalogue;
Ftp server is the catalogue that above-mentioned original directory creating one is corresponding, and/file_server/download_inverse/, using the catalogue of this correspondence as inverted file catalogue.What wherein deposit under download/ catalogue is normal file and original, and the file under the file deposited under download_inverse/ catalogue and download/ catalogue is one to one, but file content is contrary order and inverted file.Wherein, deposited original a.txt under original catalogue download/, had 3 bytes in file, 3 bytes are respectively 0xA1,0xA2,0xA3, then deposited corresponding inverted file a.txt under inverted file catalogue download_inverse/, its content is respectively 0xA3,0xA2,0xA1.
Further, in the embodiment of the present invention, the file data that described first thread and described second thread read is combined into transfer files by step S15, as shown in Figure 2, specifically comprises following fine division step:
The transfer files that S151, establishment one and described original are onesize;
First data of the corresponding described transfer files of first data in S152, file data that described first thread is read, the file data read with described first thread successively covers the Part I of described transfer files;
Last data of the corresponding described transfer files of first data in S153, file data that described second thread is read, the file data read with described second thread successively to cover in described transfer files the file data do not read by described first thread the Part II that covers.
In the embodiment of the present invention, when user initiates to read download/a.txt, ftp client first thread then reads a.txt from download/, reads from file beginning.Ftp client second thread then reads a.txt from download_inverse/ catalogue, also reads from file beginning.When the data sum >=file size that two threads read, two threads stop simultaneously.Two threads to need the file data read, according to the correct writing in files of side-play amount, specifically can adopt with the following method:
First a large transfer files the same as the size of original a.txt is created, data all in file are all 0, then the file data on the server of described first thread and the reading of the second thread is received, during written document, adjust file pointer to deviation post, by original for covering correct for data 0; Certainly, during second thread written document, need the order of data byte again to adjust, such as, by above-described embodiment, receive 0xA3,0xA2, be adjusted to 0xA2,0xA3, and then writing in files accordingly latter two position, detailed step is as follows:
The corresponding position of the transfer files that the file data write of being read by described first thread creates.The defining method of relevant position is as follows: first data of first corresponding described transfer files of data, and the file data read with described first thread successively covers the Part I of described transfer files;
The corresponding position of the transfer files that the file data write of being read by described second thread creates.The computational methods of relevant position are as follows: last data of the corresponding described transfer files of first data of reception, the file data read with described second thread successively to cover in described transfer files the file data do not read by described first thread the Part II that covers.Wherein, the process of the second thread writing in files is more complicated than the 1st thread.
Such as, second thread has been written with a file M byte at present, namely last M byte of file writes, then have received again N number of byte, then to adjust the position of current file pointer, adjust to distance end of file (EOF pointer) M+N byte place, then by this N number of byte write.
Further, the transmission method of two thread ftp in the embodiment of the present invention also comprises: be buffered in internal memory by the file data that described first thread and described second thread read, when the file data of buffer memory in described internal memory arrive preset data amount or transfer of data complete time, the file data of buffer memory in described internal memory is carried out the covering of described transfer files, the internal memory of release busy.
The embodiment of the present invention, the file data that described first thread and described second thread read is buffered in internal memory, when the file data arrival preset data amount of buffer memory in described internal memory or when being transmitted (namely transmission quantity equals file size), the file data of buffer memory in described internal memory is carried out the covering of described transfer files, the internal memory of release busy.
Further, described original and described inverted file are deployed on similar and different disk, the embodiment of the present invention can between an original and corresponding described inverted file are deployed on different disks, also can by the described original catalogue depositing at least one source file and the described inverted file catalogue of depositing corresponding inverted file be deployed on different disks.In the embodiment of the present invention, original catalogue download/ and inverted file catalogue download_inverse/ is deployed on different disks, can access conflict be reduced, improve access efficiency.
Although the embodiment of the present invention creates inverted file at server end can consume some times, but under a lot of scene, same file is downloaded by a lot of clients, thus saved the time to multiple client, therefore, if the client downloaded is abundant, then its benefit brought or considerable.
The embodiment of the present invention improves the file transfer speed under two threads conscientiously, and this enforcement not only can avoid REST frequently to call, and improves the treatment effeciency of client and server simultaneously, thus in reality test, network speed also can obtain certain raising.
And the present invention goes for the ftp server not supporting REST instruction equally, do not need the code changing ftp server.
The structured flowchart of the transmission system of a kind of two thread ftp that Fig. 3 provides for the embodiment of the present invention; As shown in Figure 3, this system comprises:
Inverted file generation unit 11, for all bytes of original being arranged by from last data to the order of first data, obtains inverted file;
First thread reading unit 12, reads described original for the first thread from first data of described original;
Second thread reading unit 13, reads described inverted file for the second thread from first data of described inverted file;
Judging unit 14, for judging whether the file data sum of described first thread and described second thread reading is more than or equal to the size of described original, when the data sum of described reading is more than or equal to the size of described original, stop described first thread and the second thread;
Transfer files generation unit 15, is combined into transfer files for the file data described first thread and described second thread read.
Further, the transmission system of two thread ftp of embodiment of the present invention proposition also comprises:
Inverted file directory creating unit, for the inverted file catalogue that the original directory creating one for comprising at least one original is corresponding;
Memory cell, for will under at least one inverted file be stored in described inverted file catalogue one to one with at least one original described.
In the embodiment of the present invention, ftp server, to the file under ftp catalogue, prepares two catalogues at server end.Such as, file directory is as follows :/file_server/download/, as original catalogue; Ftp server is the catalogue that above-mentioned original directory creating one is corresponding, and/file_server/download_inverse/, using the catalogue of this correspondence as inverted file catalogue.What wherein deposit under download/ catalogue is normal file and original, and the file under the file deposited under download_inverse/ catalogue and download/ catalogue is one to one, but file content is contrary order and inverted file.Wherein, deposited original a.txt under original catalogue download/, had 3 bytes in file, 3 bytes are respectively 0xA1,0xA2,0xA3, then deposited corresponding inverted file a.txt under inverted file catalogue download_inverse/, its content is respectively 0xA3,0xA2,0xA1.
Further, in embodiments of the present invention, the transfer files generation unit 15 of proposition, as shown in Figure 4, specifically comprises:
Transfer files creation module 151, for creating one and the onesize transfer files of described original;
First overlay module 152, for first data by the corresponding described transfer files of first data in the file data of described first thread reading, the file data read with described first thread successively covers the Part I of described transfer files;
Second overlay module 153, for last data of the corresponding described transfer files of first data in file data that described second thread is read, the file data read with described second thread successively to cover in described transfer files the file data do not read by described first thread the Part II that covers.
In the embodiment of the present invention, when user initiates to read download/a.txt, ftp client first thread then reads a.txt from download/, reads from file beginning.Ftp client second thread then reads a.txt from download_inverse/ catalogue, also reads from file beginning.When the data sum >=file size that two threads read, two threads stop simultaneously.Two threads need the file data read according to the correct writing in files of side-play amount, specifically can adopt with the following method: first create a large file the same as the size of original a.txt, data all in file are all 0, then the file data on the server of described first thread and the reading of the second thread is received, during written document, adjust file pointer to deviation post, by original for covering correct for data 0; Certainly, during second thread written document, need the order of data byte again to adjust, such as, by above-described embodiment, receive 0xA3,0xA2, be adjusted to 0xA2,0xA3, and then writing in files accordingly latter two position.
Further, also comprise in the transmission system of two thread ftp of embodiment of the present invention proposition:
Buffer unit, file data for described first thread and described second thread being read is buffered in internal memory, when the file data of buffer memory in described internal memory arrive preset data amount or transfer of data complete time, the file data of buffer memory in described internal memory is carried out the covering of described transfer files, the internal memory of release busy.
Further, in the transmission system of two thread ftp of the embodiment of the present invention, the described original in the embodiment of the present invention and described inverted file are deployed on different disks.Can access conflict be reduced, improve access efficiency.
The transmission system of the two thread ftp that the embodiment of the present invention proposes goes for the ftp server not supporting REST instruction equally, and does not need the code changing ftp server.
In sum, the transmission method of a kind of two thread ftp provided by the invention and system, for ftp client, avoid the document location scheduling of two thread complexity, can ensure that two threads terminate simultaneously, the byte of waste (reading) little more, only just may read some bytes at that moment running through more; For ftp server end, can dispose easily, easily content corresponding for two threads be put into different disk, reduce access conflict, improve access efficiency; Mutual without the REST between server end and client, what thus decrease between server end and client is mutual.The method, under the prerequisite of two threads, maximally make use of Internet resources, has maximally saved the cpu resource of client, and controls the simplest, avoids and calls REST instruction and frequent switching position.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. a transmission method of two thread ftp, is characterized in that, described method comprises:
All bytes of original are arranged by from last data to the order of first data, obtains inverted file;
First thread reads described original from first data of described original;
Second thread reads described inverted file from first data of described inverted file;
Judge whether the file data sum of described first thread and described second thread reading is more than or equal to the size of described original, when the data sum of described reading is more than or equal to the size of described original, stops described first thread and the second thread;
The file data that described first thread and described second thread read is combined into transfer files.
2. method according to claim 1, is characterized in that, described method also comprises:
Be comprise inverted file catalogue corresponding to the original directory creating one of at least one original;
Will under at least one inverted file be stored in described inverted file catalogue one to one with at least one original described.
3. method according to claim 1, is characterized in that, the described file data by described first thread and described second thread reading is combined into transfer files, specifically comprises:
Create one and the onesize transfer files of described original;
First data of the corresponding described transfer files of first data in the file data that described first thread is read, the file data read with described first thread successively covers the Part I of described transfer files;
Last data of the corresponding described transfer files of first data in the file data that described second thread is read, the file data read with described second thread successively to cover in described transfer files the file data do not read by described first thread the Part II that covers.
4. method according to claim 3, is characterized in that, described method also comprises:
The file data that described first thread and described second thread read is buffered in internal memory, when the file data of buffer memory in described internal memory arrive preset data amount or transfer of data complete time, the file data of buffer memory in described internal memory is carried out the covering of described transfer files, the internal memory of release busy.
5. method according to claim 1, is characterized in that, described original and described inverted file are deployed on different disks.
6. a transmission system of two thread ftp, is characterized in that, described system comprises:
Inverted file generation unit, for all bytes of original being arranged by from last data to the order of first data, obtains inverted file;
First thread reading unit, reads described original for the first thread from first data of described original;
Second thread reading unit, reads described inverted file for the second thread from first data of described inverted file;
Judging unit, for judging whether the file data sum of described first thread and described second thread reading is more than or equal to the size of described original, when the data sum of described reading is more than or equal to the size of described original, stop described first thread and the second thread;
Transfer files generation unit, is combined into transfer files for the file data described first thread and described second thread read.
7. system according to claim 6, is characterized in that, described system also comprises:
Inverted file directory creating unit, for the inverted file catalogue that the original directory creating one for comprising at least one original is corresponding;
Memory cell, for will under at least one inverted file be stored in described inverted file catalogue one to one with at least one original described.
8. system according to claim 6, is characterized in that, described transfer files generation unit comprises:
Transfer files creation module, for creating one and the onesize transfer files of described original;
First overlay module, for first data by the corresponding described transfer files of first data in the file data of described first thread reading, the file data read with described first thread successively covers the Part I of described transfer files;
Second overlay module, for last data of the corresponding described transfer files of first data in file data that described second thread is read, the file data read with described second thread successively to cover in described transfer files the file data do not read by described first thread the Part II that covers.
9. system according to claim 8, is characterized in that, described system also comprises:
Buffer unit, file data for described first thread and described second thread being read is buffered in internal memory, when the file data of buffer memory in described internal memory arrive preset data amount or transfer of data complete time, the file data of buffer memory in described internal memory is carried out the covering of described transfer files, the internal memory of release busy.
10. system according to claim 6, is characterized in that, described original and described inverted file are deployed on different disks.
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| CN104767801B (en) | 2018-05-08 |
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