CN103368827B - Based on local area network (LAN) instant communicating system and the method for VC++ - Google Patents
Based on local area network (LAN) instant communicating system and the method for VC++ Download PDFInfo
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Abstract
The present invention relates to a kind of instant communicating system and instant communication method, the method and system achieve user's registration, user's login, good friend's additions and deletions, check good friend's data, send message, pocket transmission news, document backup function.Around the ground literal communication function of instant messaging, devise management online user, safeguard online user, realize the word communication master server of word communication.In order to alleviate the load of server, the transmission of the ground literal message of client, first utilize UDP to attempt the transmission of P2P, if failure, attempt from master server transfer, this scheme substantially increases disposal ability and the response speed of server.
Description
Technical field
The present invention relates to a kind of instant communicating system and method, this instant communication method and system achieve user's registration, user's login, good friend's additions and deletions, check good friend's data, send the functions such as message, pocket transmission news, document backup.
Background technology
Along with informationalized universal and development, the application of present network not only in each enterprises and institutions more and more extensively but also has incorporated in the middle of everyone life gradually, gradually become a part indispensable in people's life.A lot of school user considers to use instant messaging to improve the quality of internal communication, makes internal communication channel in order, reduces internal communication cost.Especially there is exigence in university especially.If school user uses several MSNs free at present, then cannot give full play to the advantage being in same local area network (LAN).In addition, virtual due to network, all allow user oneself to name arbitrarily in current MSN, this brings inconvenience more to the management of user, and is unfavorable for the interchange of school user.Analyze above reason, the instant communicating system software that known independent development is applied to school user has very large meaning in actual life.
The most pattern of instant messaging still adopts C/S (Client/Server, client/server) structure, but it is different from traditional client terminal/server structure.First user obtains buddy list from instant message IM server, to set up point-to-point contact, then adopt point-to-point mode to send information between user (Client) and its good friend (Client2): cannot direct point-to-point contact time, then complete by the mode of transit server.Model of client/server, is also called Client/Server model, is called for short C/S framework.C/S computing technique occupies an important position in information industry.This CLIENT/SERVER MODEL is a kind of asymmetric programming mode.The basic thought of this pattern is that the application concentrated in together is divided into two different parts of function, runs on a different computer respectively, by realizing a complete function sharing out the work and help one another between them.For this pattern, wherein a part needs as server, is used for response provide fixing service for client; Another part is then used for filing a request to server or requiring that certain is served as client program.
Server is in a Central Position in C/S model.Server is generally multiple customer service simultaneously, and this just causes the complexity of server design.Particularly as this kind of server with community cultule of instant communication server, it only has for colony provides service just meaningful.Instant communication server is data center, and it is the intermediary of client activities, and demand fulfillment is to the request of numerous client.
Instantaneous communication system adopts Client/Server architecture, i.e. client-server client architecture.C/S structure is widely used in constructs database system, and it comprises connection multiple stage computer in one network.Process application program also asks the computer of another Computer Service to be called client, and the computer of process database is called server.Be characterized in that client only loads application software, and database is put on the server, client so just can be made not need to store data, thus simplify client software.The server end of instantaneous communication system and client carry out communication by SOCKET.Server end is monitored, and when there being communication behavior, initiated to connect by client, server end responds.
In above-mentioned C/S system architecture, interpolation good friend, deletion good friend, user register directly by server update database, user logs in, checks good friend's data, be then by after server lookup database to client return information, send that message is then same first issues server end by client, and then forwarded by server end, document backup is also first send to destination address again via server by same mode, and pocket transmission news is then that the message first will mass-sended is sent to server and sends to all clients by server again.
In this scheme, server is generally multiple customer service simultaneously, and this just causes the complexity of server design.Server had both needed to safeguard data, and need again for all clients send message, when client is more, the load of server will be very large.
In addition, also have a kind of P2P system architecture, client first to the IP address of the corresponding good friend of server lookup, and sends good friend's request directly to this client when adding good friend, and database update has then been come by server.Delete good friend, user's registration can be completed by server update database.User log in, check good friend's data, then by after server lookup database to client return information, send message be then, after returning to the IP address of object client by server, directly send to another client by client.Send file consistent with transmission message process.
In this scheme, server is mainly used in service data information, and client then assume responsibility for all transmission message, sends the work of file.The load of server reduces greatly, but if when having a side not online, this scheme is inapplicable.
Summary of the invention
In order to overcome the shortcoming of above-mentioned two kinds of system architectures, above-mentioned two kinds of system architectures merge by the present invention, for upgrading or the operation of Query Database, directly completed by server, first operation for transmission message, transmission file is attempted P2P and is sent, if send unsuccessfully, comes forwarding messages or file by server.
In sum, the invention provides a kind of local area network (LAN) instant communicating system based on VC++, adopt the scheme that C/S framework merges mutually with P2P framework, P2P technology can alleviate the load of server greatly on the one hand, on the other hand, server forwarding mechanism adds the reliability that message sends.
Based on a local area network (LAN) instant communication method of VC++, comprising: user's registration step, user's login step, good friend's step of adding, good friend's delete step, user message forwarding step, group message forwarding step, file transmission step, user exit step etc.
This user's registration step comprises: user's filling registration information, client inspection message form, according to the message format encapsulation of data of arranging in advance, client sends new registration application, transmission log-on data, server end generates new ID, and server end adds new user in a database, and server end returns user ID to client;
This user's login step comprises: user inputs login username, password, client is according to the form encapsulation messages of arranging in advance, client sends message, server end checking log-on message, server end returns and logs in whether legal information, and as legal, Query Database returns this user profile, server end transmission buddy list, server end transmitting offline information, server end refreshes other online user's lists;
This interpolation good friend step comprises: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as added successfully, client buddy list increases this good friend;
This good friend's delete step comprises: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as deleted successfully, client buddy list deletes this good friend;
This user message forwarding step comprises: user A sends message to user B, client is according to the form encapsulation messages of arranging in advance, if first time sends message to user B, then message is sent to server end by client, and server end resolves message, if user B is online, then server end is to its forwarding messages, and returns to the IP address of user B to user A, if user B is not online, then server end is by this message stored in deferred information table, and returns the information of user B off-line to user A; If user A sends message to user B first time, then message is directly sent to user B by client, does not need server end to forward;
This group message forwarding step comprises: after receiving groups of users message forward request, the member list of this group is read from database, all members of group send this group message one by one, first attempt direct repeating query to the transmission message of each member point-to-point (P2P), forwarded by server again when certain message sends unsuccessfully.
This file transmission step comprises: when user A and user B sent message, user A has known the IP address of user B, and user A directly sends to B fileinfo, if directly send failure, then document backup transfer request is proposed, to complete the transmission of file by client;
This user exits step and comprises: after user exits, and client sends exit message, server end more new database refresh online user's list, and server end notifies that good friend is rolled off the production line, and client changes friend state.
Based on a local area network (LAN) instant communicating system of VC++, comprising: user registration module, user log-in block, interpolation good friend module, good friend's removing module, user message sending module, group message sending module, file delivery module, user exit module etc.
User registration module, in this module, user's filling registration information, client inspection message form, according to the message format encapsulation of data of arranging in advance, client sends new registration application, transmission log-on data, server end generates new ID, and server end adds new user in a database, and server end returns user ID to client;
User log-in block, in this module, user inputs login username, password, and client is according to the form encapsulation messages of arranging in advance, and client sends message, server end checking log-on message, server end returns and logs in whether legal information, and as legal, Query Database returns this user profile, server end transmission buddy list, server end transmitting offline information, server end refreshes other online user's lists;
Add good friend's module, in this module, client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as added successfully, client buddy list increases this good friend;
Good friend's removing module, in this module, client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as deleted successfully, client buddy list deletes this good friend;
User message sending module, in this module, user A sends message to user B, client is according to the form encapsulation messages of arranging in advance, if first time sends message to user B, then message is sent to server end by client, and server end resolves message, if user B is online, then server end is to its forwarding messages, and returns to the IP address of user B to user A, if user B is not online, then server end is by this message stored in deferred information table, and returns the information of user B off-line to user A; If user A sends message to user B first time, then message is directly sent to user B by client, does not need server end to forward;
Group message sending module, in this module, after receiving groups of users message forward request, the member list of this group is read from database, all members of group send this group message one by one, first attempt direct repeating query to the transmission message of each member point-to-point (P2P), forwarded by server again when certain message sends unsuccessfully.
File delivery module, in this module, when user A and user B sent message, user A has known the IP address of user B, user A directly sends to B fileinfo, if directly send failure, then document backup transfer request is proposed, to complete the transmission of file by client;
User exits module, and in this module, after user exits, client sends exit message, server end more new database refresh online user's list, and server end notifies that good friend is rolled off the production line, and client changes friend state.
Accompanying drawing illustrates:
Fig. 1 is instant communicating system example
Fig. 2 is system thread structure
Fig. 3 user log-in block flow chart
Fig. 4 sends group message flow chart
Fig. 5 sends document flowchart
Embodiment
The client of instant communicating system can log in after can realizing registration, authentication, friend state display, good friend's additions and deletions, transmission message, pocket transmission news, the functions such as document backup; Client can realize P2P chat, send file simultaneously.
Client can be the web application adopting VC++MFC to develop under windows platform.All static datas (needing the data of preserving when service stopping) are preserved and tissue with database.
The functional module of client comprises user registration module, user log-in block, interpolation/deletion good friend module, user message sending module, group message sending module, and file send module, user exit module.When these modules communicate with client or server, all according to the protocol analysis method of arranging in advance, message is resolved, then carry out the transmission of message by underlying network communication module.
1. the implementation procedure of each module is summarized as follows:
User's register flow path: user's filling registration information, client inspection message form, according to the message format encapsulation of data of arranging in advance, client sends new registration application, transmission log-on data, server end generates new ID, and server end adds new user in a database, and server end returns user ID to client.
User's login process: user inputs login username, password, client is according to the form encapsulation messages of arranging in advance, client sends message, server end checking log-on message, server end returns and logs in whether legal information, as legal, Query Database returns this user profile, server end transmission buddy list, server end transmitting offline information, server end refreshes other online user's lists.
Add good friend's flow process: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as added successfully, client buddy list increases this good friend.
Good friend deletes flow process: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as deleted successfully, client buddy list deletes this good friend.
Send message flow: user A sends message to user B, client is according to the form encapsulation messages of arranging in advance, if first time sends message to user B, then message is sent to server end by client, and server end resolves message, if user B is online, then server end is to its forwarding messages, and returns to the IP address of user B to user A, if user B is not online, then server end is by this message stored in deferred information table, and returns the information of user B off-line to user A; If user A sends message to user B first time, then message is directly sent to user B by client, does not need server end to forward.
Group message transmission flow: after receiving groups of users message forward request, read the member list of this group from database, all members of group send this message according to user message forward process module one by one.Have the address table of the object of a group in client maintenance, first it attempt direct repeating query and send message to each member P2P, just forwarded by server when certain message sends unsuccessfully.
Document backup flow process: user A sends file to user B, and precondition is that A and B sent message, and now A has known the IP address of B, as long as file does not also send, A directly sends to B fileinfo.
User exits flow process: user exits, and client sends exit message, server end more new database refresh online user's list, and server end notifies that good friend is rolled off the production line, and client changes friend state.
2. instant communicating system realizes in the following way:
Server comprises a main thread, N number of service thread, and host process creates other thread, open TCP connectivity port, and waits for that client connects.If there is client's side link, then can be multiple long-distance user's Connection Service, can dynamically increase service thread and expand when linking number exceedes current service restriction time.Server end is responsible for establishment, maintenance and management local data structure and data file simultaneously, and synchronized update database.
Client comprises a main thread, a receiving thread, and main thread is responsible for connection server, and starts receiving thread, and receiving thread carries out different process according to the type of message.
Each modular design is as follows:
(1) user registration module
User's filling registration information, client inspection message form, according to the message format encapsulation of data of arranging in advance, client sends new registration application, transmission log-on data, server end generates new ID, and server end adds new user in a database, and server end returns user ID to client.
(2) user log-in block
As shown in Figure 3, the processing procedure of user's logging request processing module is: client sends user's request, and received server-side user logging request, first judges that whether its login password is correct.As key is incorrect, close this connection.If password is correct, then revise the record that this user is corresponding in a database, its IP, port information, presence are upgraded, and return deferred information and offline buddies request to user, all not offline buddy list are read, by the loopback of not offline buddy list to user from database.
(3) user message sending module
Customer end A sends message to customer end B, if first time send then forwarded by server, if B rolls off the production line, then by information stored in database.Otherwise A sends message directly to B.
As long as client terminal to discover object user can not receive message, all automatically transit server can be applied for.Its handling process is as follows: receive user message Forward-reques, reads the state sending targeted customer, if this User Status is off-line, then this forwarding messages is write message data table to be sent from database.If this User Status is not offline state, first judge that the master server that it logs in is current server, if not then forwarding to root server, (if current server is exactly that root server then enters respective handling module).
(4) group message sending module
Group message is a key property of enterprise-level instant messaging.In school, as assigning of notice, or network character meeting etc., necessarily require to carry out group's interchange.Therefore in system, we devise group's forward process module especially.Its processing procedure is as shown in Figure 4: after receiving groups of users message forward request, from database, read the member list of this group, all members of group send this message according to user message forward process module one by one.Have the address table of the object of a group in client maintenance, first it attempt direct repeating query and send message to each member P2P, just forwarded by server when certain message sends unsuccessfully.
(5) file send module
In school level user, the document backup of P2P is the scheme of first attempting.If two clients directly can transmit file, then directly transmit.If directly transmit failure, then propose document backup transfer request by client to master server, transfer to user file to transmit transfer request processing module and complete this service.
Failed reason is mainly:
1) destination party is arranged in the subnet having fire compartment wall, causes directly connecting;
2) source user is arranged in the subnet having fire compartment wall, causes directly connecting.
3) source user and object user are arranged in the subnet having fire compartment wall, cause directly connecting.
Its idiographic flow is as shown in Figure 5:
Receive user file and transmit transfer request (completed the process of file transfer request and response between the source and destination of document backup, direct connection cannot be set up, by the source initiating document backup to master server application documents transmission path by transfer).Master server distributes certain communication routing server for its service.
(6) add/delete good friend's module
Add good friend's module: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as added successfully, client buddy list increases this good friend.
Good friend's removing module: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as deleted successfully, client buddy list deletes this good friend.
(7) user exits module
User exits: user exits, and client sends exit message, server end more new database refresh online user's list, and server end notifies that good friend is rolled off the production line, and client changes friend state.
In the present system, on the basis of unit testing, need all modules to be assembled into system according to designing requirement.Do from the following aspects: (1), when modules is coupled together, whether the data of passing through module interface can lose; Whether the function of (2) modules can produce adverse influence to the function of another module: can (3) each subfunction combines, reach father's function that expection requires; (4) whether global data structures has problem; (5) whether the error accumulation of individual module is got up, can amplify, thus reach unacceptable degree.In order to ensure software life-cycle, while unit testing, just start assembling test, finding and get rid of may produced problem in model calling.Select any mode that module assembled is got up formation system that can run, directly have influence on the form of module testing use-case, the type of used test instrument, the order of module numbering and the order of test, and the expense of generating test use case and the expense of debugging.Usually, the mode that module assembled becomes system there are two kinds of modes: disposable assembling mode and propagation formula assembling mode.
By carrying out module testing to multiple functional module, then these modules being progressively assembled into larger system, connecting in an assembling process and testing, be progressively assembled into a complete system finally by propagation.
Claims (2)
1. the local area network (LAN) instant communication method based on VC++, comprise: user's registration step, user's login step, good friend's step of adding, good friend's delete step, user message forwarding step, group message forwarding step, file transmission step, user exit step, it is characterized in that:
This user's registration step comprises: user's filling registration information, client inspection message form, according to the message format encapsulation of data of arranging in advance, client sends new registration application, transmission log-on data, server end generates new ID, and server end adds new user in a database, and server end returns user ID to client;
This user's login step comprises: user inputs login username, password, client is according to the form encapsulation messages of arranging in advance, client sends message, server end checking log-on message, server end returns and logs in whether legal information, and as legal, Query Database returns this user profile, server end transmission buddy list, server end transmitting offline information, server end refreshes other online user's lists;
This interpolation good friend step comprises: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as added successfully, client buddy list increases this good friend;
This good friend's delete step comprises: client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as deleted successfully, client buddy list deletes this good friend;
This user message forwarding step comprises: user A sends message to user B, client is according to the form encapsulation messages of arranging in advance, if first time sends message to user B, then message is sent to server end by client, and server end resolves message, if user B is online, then server end is to its forwarding messages, and returns to the IP address of user B to user A, if user B is not online, then server end is by this message stored in deferred information table, and returns the information of user B off-line to user A; If user A sends message to user B first time, then message is directly sent to user B by client, does not need server end to forward;
This group message forwarding step comprises: after receiving groups of users message forward request, the member list of this group is read from database, all members of group send this group message one by one, first attempt direct repeating query to the transmission message of each member point-to-point (P2P), forwarded by server again when certain message sends unsuccessfully;
This file transmission step comprises: when user A and user B sent message, user A has known the IP address of user B, and user A directly sends to B fileinfo, if directly send failure, then document backup transfer request is proposed, to complete the transmission of file by client;
This user exits step and comprises: after user exits, and client sends exit message, server end more new database refresh online user's list, and server end notifies that good friend is rolled off the production line, and client changes friend state.
2. the local area network (LAN) instant communicating system based on VC++, comprise: user registration module, user log-in block, interpolation good friend module, good friend's removing module, user message sending module, group message sending module, file delivery module, user exit module, it is characterized in that:
User registration module, in this module, user's filling registration information, client inspection message form, according to the message format encapsulation of data of arranging in advance, client sends new registration application, transmission log-on data, server end generates new ID, and server end adds new user in a database, and server end returns user ID to client;
User log-in block, in this module, user inputs login username, password, and client is according to the form encapsulation messages of arranging in advance, and client sends message, server end checking log-on message, server end returns and logs in whether legal information, and as legal, Query Database returns this user profile, server end transmission buddy list, server end transmitting offline information, server end refreshes other online user's lists;
Add good friend's module, in this module, client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as added successfully, client buddy list increases this good friend;
Good friend's removing module, in this module, client is according to the form encapsulation messages of arranging in advance, and client sends message, and server end resolves message, and server end upgrades friend relation table and return state, and as deleted successfully, client buddy list deletes this good friend;
User message sending module, in this module, user A sends message to user B, client is according to the form encapsulation messages of arranging in advance, if first time sends message to user B, then message is sent to server end by client, and server end resolves message, if user B is online, then server end is to its forwarding messages, and returns to the IP address of user B to user A, if user B is not online, then server end is by this message stored in deferred information table, and returns the information of user B off-line to user A; If user A sends message to user B first time, then message is directly sent to user B by client, does not need server end to forward;
Group message sending module, in this module, after receiving groups of users message forward request, the member list of this group is read from database, all members of group send this group message one by one, first attempt direct repeating query to the transmission message of each member point-to-point (P2P), forwarded by server again when certain message sends unsuccessfully;
File delivery module, in this module, when user A and user B sent message, user A has known the IP address of user B, user A directly sends to B fileinfo, if directly send failure, then document backup transfer request is proposed, to complete the transmission of file by client;
User exits module, and in this module, after user exits, client sends exit message, server end more new database refresh online user's list, and server end notifies that good friend is rolled off the production line, and client changes friend state.
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| CN103701687A (en) * | 2013-12-19 | 2014-04-02 | 广西大学 | Communication system on basis of IM (Instant Messaging) technology |
| CN103856394A (en) * | 2014-03-20 | 2014-06-11 | 沈阳化工大学 | Online chat room system |
| CN104333505A (en) * | 2014-10-23 | 2015-02-04 | 秦科 | Instant messaging method |
| CN104468604A (en) * | 2014-12-19 | 2015-03-25 | 北京奇虎科技有限公司 | Data access method and device based on peer-to-peer network communication mode in local area network |
| CN106375378B (en) * | 2016-08-25 | 2020-08-28 | 北京每刻风物科技有限公司 | Application deployment method and system based on local area network client server structure |
| CN107086950A (en) * | 2017-03-08 | 2017-08-22 | 徐州医科大学 | A kind of implementation method of the large-scale instant message system based on dijkstra's algorithm |
| CN106998291A (en) * | 2017-04-01 | 2017-08-01 | 成都你我他科技有限公司 | The instantaneous communication system of blind date platform |
| CN107733781B (en) * | 2017-09-19 | 2021-06-22 | 上海掌门科技有限公司 | Instant messaging processing method, equipment and computer storage medium |
| CN108667899B (en) * | 2018-03-29 | 2021-04-20 | 挂号网（杭州）科技有限公司 | Multi-terminal message synchronization and isolation instant messaging method and system |
| CN113037615A (en) * | 2021-03-27 | 2021-06-25 | 北京合力金智科技发展有限公司 | Intelligent communication system |
| CN113326307A (en) * | 2021-06-15 | 2021-08-31 | 浪潮云信息技术股份公司 | Instant messaging system and method based on Java and Mysql database |
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