JP2018180837A - Attached file sharing system, user terminal, attached file sharing method, and attached file sharing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To share and save attached files received on multiple user terminals.SOLUTION: A shared storage device 22 stores attached file data T including an attached file which is attached to a mail of a mailing list sent to a plurality of user terminals, an attribute of the attached file, and control data C that associates an identifier for identifying the attached file data in a shared storage device. A user terminal 1 comprises attached file processing means 121 for receiving the mail of the mailing list with the attached file, comparing an attribute of the received attached file with the control data, and if the received attached file is not stored in the shared storage device 22, storing the received attached file in the shared storage device; control data updating means 122 for associating the attribute of the received attached file with the identifier and updating the control data in the control data C; and identifier storage means 123 for associating the attribute of the received attached file with the identifier and storing it in the identifier correspondence data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an attached file sharing system including a plurality of user terminals and a shared storage connected to the plurality of user terminals, a user terminal, an attached file sharing method, and an attached file sharing program.

  There is known a mailing list capable of sending e-mails simultaneously to a plurality of e-mail addresses. This mailing list can also send attachments. If there is an attached file in the mailing list mail, each user terminal stores the attached file on the local disk.

  Also, software for sharing emails among a plurality of people is in widespread use (see, for example, Non-Patent Document 1). In the method described in Non-Patent Document 1, it is possible to process e-mails arriving at one e-mail address with a plurality of terminals.

EC's Mikata, "E-mail sharing and management tools thoroughly compared four! Reply omission, double response to zero", [online], August 24, 2016, [April 3, 2017 search], Internet <URL: https://www.ecnomikata.com/ecnews/5847/>

  If there is an attached file in the mail of the mailing list, each user terminal stores the attached file on the local disk, so the capacity of the local disk may be compressed depending on the size of the attached file.

  Since the attached file of the mail of the mailing list is received by a plurality of user terminals, it is conceivable to share and save the attached file with a plurality of user terminals. However, the method described in Non-Patent Document 1 enables processing of e-mails delivered to one e-mail address with a plurality of terminals, and is used to share only the attached file of the mail mailing list delivered to an individual. It is not possible.

  Therefore, an object of the present invention is to provide an attached file sharing system, a user terminal, an attached file sharing method, and an attached file sharing program for sharing and storing attached files received by a plurality of user terminals.

  In order to solve the above problems, a first feature of the present invention relates to an attached file sharing system including a plurality of user terminals and a shared storage device connected to the plurality of user terminals. In the first aspect of the present invention, a shared storage device includes attached file data including an attached file attached to a mailing list mail sent to a plurality of user terminals, an attribute of the attached file stored in the shared storage device, And control data to be associated with an identifier for identifying attached file data in the shared storage device. When the user terminal receives the mail of the mailing list with the attached file, the user terminal compares the attribute of the received attached file with the control data to determine whether the received attached file is stored in the shared storage device or not. When the attached file is not stored in the shared storage device, the received attached file is stored in the shared storage device, and when the received attached file is stored, the attached file processing for acquiring the identifier of the received attached file Control data updating means for updating the control data by associating the attribute of the received attached file with the identifier and the identifier when the received attached file is not stored in the shared storage device; and the received attached file And an identifier storing means for storing the attribute corresponding to the identifier and the identifier in the identifier corresponding data.

  A second feature of the present invention relates to a user terminal used in an attached file sharing system including a plurality of user terminals and a shared storage device connected to the plurality of user terminals. In a second aspect of the present invention, a shared storage device includes attached file data including an attached file attached to a mailing list mail sent to a plurality of user terminals, an attribute of the attached file stored in the shared storage device, And control data to be associated with an identifier for identifying attached file data in the shared storage device. When the user terminal receives the mail of the mailing list with the attached file, the user terminal compares the attribute of the received attached file with the control data to determine whether the received attached file is stored in the shared storage device or not. When the attached file is not stored in the shared storage device, the received attached file is stored in the shared storage device, and when the received attached file is stored, the attached file processing for acquiring the identifier of the received attached file Control data updating means for updating the control data by associating the attribute of the received attached file with the identifier and the identifier when the received attached file is not stored in the shared storage device; and the received attached file And an identifier storing means for storing the attribute corresponding to the identifier and the identifier in the identifier corresponding data.

  The shared storage device stores attached file data and control data in different URIs for each mailing list identifier, and the user terminal stores URI association data in which the mailing list identifier is associated with the URI, and attached file processing The means compares the attribute of the attached file of the mail of the mailing list with the control data of the URI associated with the identifier of the mailing list, and determines whether the received attached file is stored in the shared storage device or not. It is good.

  The control data is provided as a file different for each attached file, and the file name of each file of the control data may include the attribute or identifier of the attached file.

  The attached file processing means may add an identifier to the name of the received attached file and save it in the shared storage device.

  The user terminal may further include attached file reference means for referring to the attached file stored in the shared storage device based on the attribute and the identifier of the attached file.

  A third aspect of the present invention relates to an attached file sharing method used in an attached file sharing system including a plurality of user terminals and a shared storage device connected to the plurality of user terminals. According to a third aspect of the present invention, there is provided an attached file sharing method, wherein a shared storage device stores attached file data including an attached file attached to a mail of a mailing list transmitted to a plurality of user terminals; Storing the control data in which the device associates the attribute of the attached file stored in the shared storage device with the identifier for identifying the attached file data in the shared storage device; and the user terminal executes the mail of the mailing list with the attached file When received, the step of determining whether or not the received attached file is stored in the shared storage device by comparing the attribute of the received attached file with the control data, and the user terminal receiving the attached file in shared storage If not stored in the device, save the received attached file in the shared storage device, control data And associating the attribute of the received attached file with the identifier to update the control data, and, when the received attached file is stored, the user terminal obtaining the identifier of the received attached file, The user terminal includes the step of associating the received attribute of the attached file with the identifier and storing it in the identifier corresponding data.

  A fourth aspect of the present invention relates to an attached file sharing program for functioning as a user terminal according to the second aspect of the present invention.

  According to the present invention, it is possible to provide an attached file sharing system, a user terminal, an attached file sharing method, and an attached file sharing program for sharing and storing attached files received by a plurality of user terminals.

It is a figure explaining the system configuration of the attached file sharing system concerning an embodiment of the invention. It is a figure explaining an example of the file memorize | stored in the shared storage apparatus which concerns on embodiment of this invention. It is a figure explaining an example of control data concerning an embodiment of the invention. It is a sequence diagram explaining an attached file sharing method concerning an embodiment of the invention. It is a figure explaining the hardware constitutions and function block of the user terminal which concern on embodiment of this invention. It is a figure explaining an example of serial number corresponding data concerning an embodiment of the invention. It is a figure explaining the hardware constitutions and function block of the file server which concern on embodiment of this invention. It is a figure explaining an example of the file memorize | stored in the shared storage apparatus which concerns on a 1st modification. It is a figure explaining an example of control data concerning a 1st modification. It is a figure explaining the hardware constitutions and function block of the user terminal concerning a 1st modification. It is a figure explaining an example of the URI corresponding data concerning the 1st modification. It is a figure explaining an example of the file memorize | stored in the shared storage apparatus which concerns on a 2nd modification. It is a figure explaining an example of control data concerning the 2nd modification. It is a sequence diagram explaining the attached file sharing method concerning the 2nd modification. It is a figure explaining the hardware constitutions and function block of the user terminal concerning a 2nd modification.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are given the same or similar reference numerals.

Embodiment
The attached file sharing system 5 shown in FIG. 1 includes a first user terminal 1a, a second user terminal 1b, a file server 2 and a mail server 3. The first user terminal 1a, the second user terminal 1b, the file server 2 and the mail server 3 are communicably connected to each other by the communication network 4.

  Although the case where two user terminals 1 are provided in the example shown in FIG. 1 will be described, the number of user terminals 1 may be one, or three or more. In the embodiment of the present invention, the first user terminal 1a and the second user terminal 1b may be simply referred to as the user terminal 1 when not particularly distinguished.

  The user terminal 1 is a terminal used by a user. Software called a so-called mailer is installed in the user terminal 1, and the user terminal 1 receives a mail from the mail server 3 using the mailer. The mailer of the user terminal 1 receives the mail attached with the file in the mailing list, and shares the file (attached file) attached to the mail of the mailing list with the shared storage device 22 of the file server 2.

  The mail server 3 transmits the mail addressed to the first user terminal 1a and the second user terminal 1b to the first user terminal 1a and the second user terminal 1b. In the embodiment of the present invention, the mail server 3 controls transmission and reception of the mail with the file attached in the mailing list.

  The file server 2 includes a shared storage device 22 connectable from the first user terminal 1a and the second user terminal 1b. The shared storage device 22 stores the attached file of the mail of the mailing list, and is controlled so as to be accessible from the first user terminal 1a and the second user terminal 1b.

  In the embodiment of the present invention, the shared storage device 22 of the file server 2 stores control data C and attached file data T as shown in FIG.

  The attached file data T includes an attached file attached to the mail of the mailing list sent to the plurality of user terminals 1. The attached file data T is a set of attached files attached to the mail of the mailing list received by each user terminal 1 as shown in FIG. The attached file data T is stored only in the shared storage device 22 regardless of the number of user terminals 1 serving as mailing list mail destinations, and each user who has received the email receives the attached file stored in the shared storage device 22. The terminal 1 refers to.

  At this time, each attached file is controlled such that the access right is set so that only the user terminal 1 that has received the attached file as a mailing list can refer to it. The method of setting the access right may be a general method, for example, a method of specifying an identifier such as the IP address of the referable user terminal 1 or a method of providing a password only to the referable user terminal 1 Be

  As shown in FIG. 3, the control data C associates the attribute of the attached file stored in the shared storage device 22 with an identifier (serial number) for identifying the attached file data in the shared storage device 22. It plays a role of an index of each attached file constituting the attached file data T, and is data in which an identifier of each attached file is associated with its attribute. In the embodiment of the present invention, the attribute of the attached file is, but not limited to, the mail transmission time, the mailing list identifier and the subject. Also, the identifier of the mailing list is, for example, the address of the addressee or sender of the mail.

  In the embodiment of the present invention, the identifier of the attached file is a serial number. By assigning a serial number to the file name of each attached file, even if the file name of the attached file is duplicated, it is possible to uniquely identify it by the serial number.

  In the embodiment of the present invention, the shared storage device 22 will be described as a storage device incorporated in the file server 2. However, the present invention is not limited to this. The shared storage device 22 is a storage device not connected to a computer. It may be. The shared storage device 22 may be realized by a hard disk, a semiconductor memory or the like, and the method of realizing the shared storage device 22 does not matter.

(Attachment file sharing method)
The attached file sharing method according to the embodiment of the present invention will be described with reference to FIG.

  First, in steps S1 and S11, the mail server 3 transmits the mail of the mailing list in which the first user terminal 1a and the second user terminal 1b are set as the destinations. This email contains an attached file, and further includes information on transmission time, mailing list identifier (ML identifier) and subject as attributes of the email.

  When the first user terminal 1a receives the mail in step S1 and confirms that the attached file is included, the first user terminal 1a requests the reference to the control data C in the shared storage device 22 in step S2. Is transmitted, and the first user terminal 1a acquires and references control data C in step S3.

  In step S4, the first user terminal 1a refers to the control data C, and for the attached file stored in the past, there is an attached file having the same attribute of mail, specifically transmission time, ML identifier and subject. It is determined whether or not. If there is no attached file having a common attribute of the mail, specifically, if the same attached file is not stored in the shared storage device 22 in the past, serial numbers are assigned in step S5 and the file name of the attached file Change the file name to include the serial number in the original file name. The first user terminal 1a increments the past largest serial number included in the control data C, and assigns a serial number for the attached file received in step S1.

  In step S6, the first user terminal 1a updates the control data C. In the control data C, the first user terminal 1a associates the attribute of the mail received in step S1 with the serial number assigned in step S5. Specifically, as shown in FIG. 3, a record having a transmission time, an ML identifier, a subject, and a serial number, which are attributes of the mail, is inserted into the control data C. At this time, exclusive control is preferably performed so that control data C of the shared storage device 22 is not updated from another user terminal 1.

  In step S7, the first user terminal 1a stores the control data updated in step S6 and the attached file received in step S1 in the shared storage device 22. At this time, for the attached file received in step S1, a request is made to set an access right so that the first user terminal 1a can refer to it. This request includes an identifier such as the IP address of the first user terminal 1a, as necessary. In step S8, the first user terminal 1a receives a response. This response includes, as necessary, access information such as a password for referring to the attached file.

  In step S9, the first user terminal 1a associates and holds the attribute of the mail received in step S1 and the serial number assigned in step S5.

  When the second user terminal 1b receives the mail in step S11 and confirms that the attached file is included, the second user terminal 1b requests the reference to the control data C in the shared storage device 22 in step S12. Is transmitted, and the second user terminal 1b acquires and refers to the control data C in step S13.

  In step S14, the second user terminal 1b refers to the control data C and determines whether or not there is an attached file having the same mail attribute as the attached file stored in the past. If there is an attached file having the same mail attribute, the serial number is acquired from the control data C in step S15.

  In step S16, the second user terminal 1b makes a request for setting the access right so that the second user terminal 1b can refer to the attached file received in step S11. At this time, the second user terminal 1b may transmit the serial number acquired in step S15 to the shared storage device 22 and designate a target for setting the access right. In step S17, the second user terminal 1b receives the response.

  In step S18, the second user terminal 1b associates and holds the attribute of the mail received in step S11 and the serial number acquired in step S15.

  In step S21, the first user terminal 1a transmits the serial number associated with the attribute of the mail including the attached file and the authentication information such as the password to the shared storage device 22 based on the information held in step S9. And browse the attached file.

  In step S22, based on the information held in step S18, the second user terminal 1b transmits the serial number associated with the attribute of the mail including the attached file, and authentication information such as a password to the shared storage device 22. And browse the attached file.

(User terminal)
The user terminal 1 according to the embodiment of the present invention will be described with reference to FIG.

  The user terminal 1 is a general computer including a processing unit 11, a storage unit 12, an input unit 13, an output unit 14 and a communication control unit 15. A general computer implements each function shown in FIG. 5 by executing an attached file sharing program which performs predetermined processing. The attachment sharing program may be implemented as an add-on that implements the mailer extension.

  The storage unit 11 stores the attached file sharing program, and stores the mail data 111, the control data C, and the identifier correspondence data 112.

  The mail data 111 is data of a mail received from the mail server 3. The mail data 111 includes not only the data of the header and the text of the mail but also the data of the attached file of the mail sent to the user of the user terminal 1 instead of the mailing list. The mail data 111 is updated by a so-called mailer (not shown).

  The control data C is control data C stored in the shared storage device 22 and stored for reference or update in the user terminal 1.

  The identifier correspondence data 112 is data in which an attribute of a mail is associated with a serial number. The identifier correspondence data 112, as shown in FIG. 6, for example, associates serial numbers with the attributes of the mail including the transmission time, the mailing list identifier and the subject. When referring to the attached file stored in the shared storage device 22, the identifier correspondence data 112 is used to identify a serial number from the attribute of the attached file, and further specify the attached file by the serial number.

  The identifier correspondence data 112 may correspond to the mail attribute and the serial number, and any data format may be used. The identifier correspondence data 112 may be, for example, in a form in which serial numbers are associated with each mail of the mail data 111.

  The processing device 12 includes an attached file processing unit 121, a control data updating unit 122, an identifier storage unit 123, and an attached file reference unit 124.

  When the attached file processing means 121 receives the mail of the mailing list with the attached file, it compares the attribute of the received attached file with the control data C stored in the shared storage device 22, and the received attached file is shared storage It is determined whether it is stored in the device 22 or not. When the received attached file is not stored in the shared storage device 22, the attached file processing means 121 stores the received attached file in the shared storage device, and when the received attached file is stored, the received attachment Get the file serial number (identifier).

  In a state in which mails including attached files are transmitted to the plurality of user terminals 1 as the mailing list, the user terminal 1 which first accesses the shared storage device 22 stores the attached files in the shared storage device 22. Specifically, when it is determined that the attached file is not stored in the shared storage device 22, the attached file processing means 121 assigns a serial number and associates the control data C with the attribute of the mail and the serial number. , And stores the attached file in the shared storage device 22. On the other hand, when the attached file is stored in the shared storage device 22 by another user terminal 1, the attached file processing means 121 acquires a serial number from the control data C.

  The attached file processing means 121 may add a serial number (identifier) to the name of the received attached file, and save it in the shared storage device 22. For example, if the attached file name is "XXXXXXX.XXX" and the serial number is "3", the attached file processing means 121 adds "--3" in which the hyphen and the serial number are connected before the extension of the attached file. Connect and change the file name of the attached file to "XXXXXXX-3.XXX". Although the attached file is stored in the shared storage device 22 sequentially, by adding a serial number to the file name, it is possible to prevent the file name from being redundantly stored. Further, when the user terminal 1 refers to the attached file, the attached file to be referred can be specified by specifying the serial number even if there is no information such as the attribute of the mail.

  Further, the attached file processing unit 121 may set an access right for an attached file which can be referred to among the attached files stored in the shared storage device 22.

  When the received attached file is not stored in the shared storage device 22, the control data updating unit 122 updates the control data C by associating the attribute of the received attached file with the identifier of the control data C. When the attached file is not stored in the shared storage device 22 and the attached file processing means 121 stores the attached file in the shared storage device 22, the control data updating means 122 adds the control data C of the shared storage device 22 to Add and update the information of the newly stored attached file. The control data updating unit 122 stores the updated control data in the shared storage device 22.

  The identifier storage unit 123 associates the received attribute of the attached file with the serial number (identifier) and stores it in the identifier corresponding data 112. The identifier storage means 123 associates, with a serial number, information on the access right set for attached files that can be referred to by the attached file processing means 121 among the attached files stored in the shared storage device 22. It is good.

  The attached file reference unit 124 refers to the attached file stored in the shared storage device 22 based on the attribute and serial number (identifier) of the attached file. For example, when the user inputs an instruction to refer to an attached file of a predetermined mail of the mailing list, the attached file reference unit 124 refers to the identifier correspondence data 112 to specify a serial number from the attribute of the indicated mail. . The attached file reference unit 124 transmits the identified serial number to the shared storage device 22, acquires the attached file corresponding to the serial number from the attached file data T, and outputs it.

  Here, the attached file reference unit 124 may transmit information related to the access right such as an IP address to the shared storage device 22 as necessary.

(file server)
The file server 2 according to the embodiment of the present invention will be described with reference to FIG.

  The file server 2 is a general computer including a processing device 21, a storage device (common storage device) 22 and a communication control device 23.

  The storage device 22 stores the control data C and the attached file data T as described with reference to FIG.

  As described above, according to the attached file sharing system 5 according to the embodiment of the present invention, originally, the attached file of the mailing list is separately stored in the plurality of user terminals 1, but only in the shared storage device 22. It is memorized. Thereby, the attached file sharing system 5 can avoid compression of the storage capacity of the user terminal 1 and secure a larger storage capacity as the entire system.

  Also, by assigning the serial number of each attached file to the shared storage device 22 and storing it, it is possible to appropriately identify the desired attached file even when the file names of the attached files overlap.

(First modification)
In the embodiment of the present invention, the shared storage device 22 stores one control file as the control data C and a plurality of attached files as the attached file T. In the case where the number of user terminals 1 is large or the like, there may be a case where a conflict occurs in control data C and the system is stuck.

  Therefore, in the first modification, as shown in FIG. 8, a case will be described where the storage area of the shared storage device 22 is divided for each mailing list identifier, and a file of control data C is provided in each storage area.

  As shown in FIG. 8, the shared storage device 22 distributes and stores the attached file data T and the control data C in URIs (Uniform Resource Identifiers) different for each mailing list identifier. The storage area of the shared storage device 22 is divided into mailing lists "ABC", "DEF" and "GHI". The area 22a for the mailing list "ABC" stores control data C1 for the mailing list "ABC" and attached file data T1 received by the mailing list "ABC". The same is true for the mailing lists "DEF" and "GHI".

  As shown in FIG. 9A, the control data C1 for the mailing list "ABC" holds the attribute of the mail including the attached file related to the mailing list "ABC" in association with the serial number of the attached file. Control data C1 does not include information on the other mailing lists "DEF" and "GHI".

  As described above, the shared storage device 22 is divided into mailing lists, the control data C is divided into a plurality of files corresponding to the respective mailing lists, and distributed and held in each division. As a result, even when the number of user terminals 1 is large, contention for control data C can be made less likely to occur.

  In the first modified example, the user terminal 1 has a configuration as shown in FIG. In the user terminal 1 shown in FIG. 10, compared with the user terminal 1 according to the embodiment of the present invention described with reference to FIG. 5, the storage device 11 stores the URI association data 113, and the processing device 12 performs URI. The difference is that the updating means 125 is provided.

  The URI correspondence data 113 is data in which an identifier of a mailing list is associated with a URI. As shown in FIG. 11, in the URI association data 113, URIs are associated with each of the mailing list identifiers "ABC", "DEF" and "GHI".

  The URI updating means updates the URI correspondence data 113. For example, when the shared storage device 22 is provided with an area for a new mailing list, the file server 2 or the management apparatus (not shown) can set the URI of the area and the identifier of the new mailing list to each user. Send to terminal 1 The URI updating means 125 updates the URI correspondence data 113 upon receiving the new mailing list identifier and its URI.

  Here, the attached file processing unit 121, the control data updating unit 122, and the attached file reference unit 124 refer to the URI correspondence data 113 when accessing the shared storage device 22, respectively, and the predetermined processing of the shared storage device 22 is performed. Access the area

  For example, the attached file processing means 121 compares the attribute of the attached file of the mail of the mailing list with the control data of the URI associated with the identifier of the mailing list, and the received attached file is stored in the shared storage device 22 Determine if there is. More specifically, in the sequence diagram shown in FIG. 4, the user terminal 1 designates the URI of the access destination from the identifier of the mailing list of the mail including the attached file in steps S2 and S12, and sets control data C. get. In step S7, the user terminal 1 stores control data C, an attached file, etc. in a predetermined URI of the shared storage device 22. Furthermore, in steps S21 and S22, the user terminal 1 connects to a predetermined URI of the shared storage device 22 and refers to the attached file.

  As described above, in the first modification, the shared storage device 22 provides an area for each mailing list, and distributes and stores control data and attached files in each area. This makes it possible to avoid a race condition in which a plurality of user terminals 1 reference or update control data C.

(Second modification)
In the embodiment and the first modification of the present invention, the case where information of a plurality of attached files is included in one file of control data C has been described, but in the case where the number of user terminals 1 is large, etc. It is possible that a conflict occurs in the control data C and the system is stuck.

  Therefore, in the second modified example, a case will be described in which one file of control data C includes information of one attached file. Also in the second modification, as described in the first modification, the storage area of the shared storage device 22 is divided for each mailing list identifier, and a file of control data C is provided in each storage area. Also good.

  As shown in FIG. 12, in the shared storage device 22, control data C is provided as a file different for each attached file. In the second modification, the file name of each file constituting the control data C is configured to include an attribute or an identifier of an attached file in order to resolve the name of the control file. In the second modified example, the control file is data that constitutes a part of the control data C, and the control data C according to the embodiment of the present invention is divided for each attached file.

  Each file name of the control data C in the example shown in FIG. 12 is a file name of the control file by connecting a character string in which a transmission time, a mailing list identifier and a subject are connected in parentheses before the extension. Change to "Control data (XXXABCXXX) .XXX". In each control data file, as shown in FIG. 13, serial numbers are written. As another example, the file name of control data C may include the identifier (serial number) of the attached file, and the attribute of the attached file may be described in the file. Also, the file name of control data C may include the attribute and serial number of the attached file.

  The attached file sharing method according to the second modified example will be described with reference to FIG.

  First, in step S51, when the first user terminal 1a receives an email and confirms that an attached file is included, in step S52, the first user terminal 1a sends the shared storage device 22 to the shared storage device 22 for this attached file. In step S53, a reply indicating that there is no control file is received.

  In step S54, the first user terminal 1a refers to the serial number included in the name of the attached file stored in the shared storage device 22 and increments the largest serial number by one for a new attached file. Number the serial number. In step S55, a control file forming part of the control data C is generated. The file name of the control file has a string in which the transmission time, the mailing list identifier and the subject are concatenated.

  In step S56, the first user terminal 1a stores the control file created in step S55 and the attached file received in step S1 in the shared storage device 22. At this time, the attached file received in step S1 may be requested to set the access right so that the first user terminal 1a can refer to the attached file. In step S57, the first user terminal 1a receives a response.

  In step S58, the first user terminal 1a associates and holds the attribute of the mail received in step S51 and the serial number assigned in step S54.

  When the second user terminal 1b receives the mail in step S61 and confirms that the attached file is included, the second user terminal 1b sends the shared storage device 22 to the shared storage device 22 for the attached file in step S62. It is inquired about the presence or absence of the control file, and in step S63, a reply indicating that the control file exists is received. In step S64, the second user terminal 1b refers to the control file for the attached file, and acquires the serial number of the attached file.

  In step S65, the second user terminal 1b makes a request for setting the access right so that the second user terminal 1b can refer to the attached file received in step S61. At this time, the second user terminal 1b may transmit the serial number acquired in step S64 to the shared storage device 22 and designate a target for setting the access right. In step S66, the second user terminal 1b receives the response.

  In step S67, the second user terminal 1b associates and holds the attribute of the mail received in step S11 and the serial number acquired in step S64.

  In step S71, the first user terminal 1a transmits the serial number associated with the attribute of the mail including the attached file and the authentication information such as the password to the shared storage device 22 based on the information held in step S58. And browse the attached file.

  In step S72, the second user terminal 1b transmits the serial number associated with the attribute of the mail including the attached file and the authentication information such as the password to the shared storage device 22 based on the information held in step S67. And browse the attached file.

  A user terminal 1 according to a second modification will be described with reference to FIG. The user terminal 1 according to the second modification is different from the user terminal 1 according to the embodiment of the present invention shown in FIG. 5 in that it does not include the control data updating unit 122 but includes a control file generating unit 126. .

  When the received attached file is not stored in the shared storage device 22, the control file generating unit 126 generates a control file including in the file name the attribute and the identifier of the received attached file. In the control file, a serial number assigned for the received attached file is set.

  According to the attached file sharing system according to the second modification, the control file is generated for each attached file, and exclusive control can be performed for each control file. Further, since the control file according to the second modification is only updated and referred to after being generated once, a race condition in which a plurality of user terminals 1 refer to or update control data C is avoided. It becomes possible.

(Other embodiments)
As described above, although the embodiment of the present invention and the modification examples 1 and 2 are described, it should not be understood that the description and the drawings, which form a part of this disclosure, limit the present invention. Various alternative embodiments, examples and operation techniques will be apparent to those skilled in the art from this disclosure.

  Of course, the present invention includes various embodiments and the like which are not described herein. Accordingly, the technical scope of the present invention is defined only by the invention-specifying matters according to the scope of claims appropriate from the above description.

Reference Signs List 1 user terminal 2 file server 3 mail server 4 communication network 5 attached file sharing system 11, 21 storage device 12, 22 processing device 13 input device 14 output device 15, 23 communication control device 111 mail data 112 identifier corresponding data 113 URI correspondence Data 121 attached file processing means 122 control data update means 123 identifier storage means 124 attached file reference means 125 URI update means 126 control file generation means C control data T attached file data

Claims (8)

An attached file sharing system comprising: a plurality of user terminals; and a shared storage device connected to the plurality of user terminals,
The shared storage device is
Attachment file data including an attachment attached to the mail of the mailing list sent to the plurality of user terminals;
Storing an attribute of the attached file stored in the shared storage device and control data for correlating an identifier for identifying the attached file data in the shared storage device;
The user terminal is
When the mail of the mailing list with the attached file is received, the received attribute of the attached file is compared with the control data to determine whether the received attached file is stored in the shared storage device, and the reception is performed. If the attached file is not stored in the shared storage device, the received attached file is stored in the shared storage device, and if the received attached file is stored, the identifier of the received attached file is Attachment processing means to acquire,
Control data updating means for updating the control data by correlating the attribute of the received attached file with an identifier to the control data when the received attached file is not stored in the shared storage device;
An attached file sharing system comprising: identifier storage means for associating the received attribute of the attached file with the identifier and storing the same in the identifier corresponding data. A user terminal for use in an attached file sharing system, comprising: a plurality of user terminals; and a shared storage device connected to the plurality of user terminals,
The shared storage device is
Attachment file data including an attachment attached to the mail of the mailing list sent to the plurality of user terminals;
Storing an attribute of the attached file stored in the shared storage device and control data for correlating an identifier for identifying the attached file data in the shared storage device;
The user terminal is
When the mail of the mailing list with the attached file is received, the received attribute of the attached file is compared with the control data to determine whether the received attached file is stored in the shared storage device, and the reception is performed. If the attached file is not stored in the shared storage device, the received attached file is stored in the shared storage device, and if the received attached file is stored, the identifier of the received attached file is Attachment processing means to acquire,
Control data updating means for updating the control data by correlating the attribute of the received attached file with an identifier to the control data when the received attached file is not stored in the shared storage device;
A user terminal comprising: identifier storing means for associating the received attribute of the attached file with the identifier and storing the identifier corresponding data. The shared storage device is
The attached file data and the control data are stored in different URIs for each mailing list identifier,
The user terminal is
Storing URI correspondence data in which an identifier of the mailing list is associated with the URI;
The attached file processing means compares the attribute of the attached file of the mail of the mailing list with the control data of the URI associated with the identifier of the mailing list, and the received attached file is stored in the shared storage device The user terminal according to claim 2, wherein it is determined whether or not it has been set. The control data is provided as a file different for each attached file,
The user terminal according to claim 2 or 3, wherein the file name of each file of the control data includes an attribute or an identifier of an attached file. The user terminal according to any one of claims 2 to 4, wherein the attached file processing means adds the identifier to the name of the received attached file and stores the attached file in the shared storage device. The user terminal is
The user terminal according to claim 5, further comprising: attached file reference means for referring to the attached file stored in the shared storage device based on the attribute of the attached file and the identifier. An attached file sharing method used in an attached file sharing system, comprising: a plurality of user terminals; and a shared storage device connected to the plurality of user terminals,
Storing the attached file data including the attached file attached to the mail of the mailing list sent to the plurality of user terminals;
Storing the control data in which the shared storage device associates an attribute of the attached file stored in the shared storage device with an identifier for identifying the attached file data in the shared storage device;
When the user terminal receives the mail of the mailing list with the attached file, it compares the attribute of the received attached file with the control data, and determines whether the received attached file is stored in the shared storage device or not. Determining steps;
When the received attached file is not stored in the shared storage device, the user terminal stores the received attached file in the shared storage device, and an attribute of the received attached file is stored in the control data. Updating the control data in association with an identifier;
Acquiring the identifier of the received attached file, when the received attached file is stored, the user terminal;
An attached file sharing method, comprising the step of the user terminal associating the received attribute of the attached file with the identifier and storing it in identifier correspondence data.   An attached file sharing program for causing a computer to function as the user terminal according to any one of claims 2 to 6.

Images