CN103269373A - P2P file sharing method based on JXTA platform - Google Patents
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Abstract
The invention discloses a P2P file sharing method based on a JXTA platform. The P2P file sharing method comprises a step one, namely the JXTA platform is started, equipotent nodes are added; a step two, namely whether an equipotent set is established is judged according to the nodes, if the equipotent is established, a step four is carried out, otherwise, a step three is carried out; the step three, namely the equipotent set is added to the equipotent set, the nodes need to be added to the equipotent set for sharing resources, a step five is carried out; the step four, namely the equipotent set is established, an equipotent set announcement is issued, the step five is carried out; the step five, namely service type is selected, if file sharing service establishing and announcement issuing are needed, file sharing service is established, the announcement is issued, if file request inquiring is needed, inquiring is carried out, a file is transmitted, and if exiting is selected, system exiting is carried out. According to the P2P file sharing method based on the JXTA platform, the universality of the JXTA platform is used, the sustainable development and the good portability of a system is guaranteed, and distribution performance and good expansibility are achieved.
Description
Technical field
The present invention relates to the file-sharing field, be specifically related to a kind of P2P file sharing method based on the JXTA platform.
Background technology
At present, cloud computing more and more is subjected to the attention of national governments and enterprise, and each enterprise is all at the cloud computing platform of arranging separately, and business is exactly shared file system greatly in cloud computing platform, for example the cloud dish.Popular cloud dish has the fast dish in Kingsoft etc. at present.
A kind of existing document storage system is based on centralized server, and its framework has one or several servers as the file-sharing service device, can abstractly be one.There are a plurality of clients to be attached thereto; Can directly link to each other between the client and server and also can link to each other indirectly by the agency.The user brings in by the client and uploads and downloaded resources, and data are kept in the file-sharing service device.
Yet existing centralized shared file system has poor reliability, a little less than the ability of anti-extensive aggression.If in a single day server delays machine so whole system also just mean paralysis, be unfavorable for the stability of system; In addition, though management is convenient in this system, be unfavorable for the expansion of system.
Another existing document storage system is based on distributed, and distributed shared file system is compared the centralized robustness preferably that has.Along with picture Napster, Gnutella, P2P information sharing application systems such as Freenet popular, P2P (Peer-to-Peer, being peer-to-peer network) this New-generation distributed shared file system that is different from client/server fully receiving increasing concern, P2P can be defined as simply by direct exchange message, share computer resource and service, peer computer has the function of client-server concurrently, all nodes are reciprocity in this network, these peer node have common responsibility and ability and work in coordination with the service of finishing, realize information resources by direct interconnection between them, the overall sharing of processor resource and storage resources, and do not need to rely on the support of centralized server, eliminated information island and resource isolated island phenomenon.
JXTA is the general P2P agreement of one group of opening being released by SUN company, it allow any access network equipment communicate and collaborative work as peer-to-peer, as mobile phone, PDA, PC, server etc.JXTA is a framework with series of standards, and standard wherein is used for supporting P2P to use.The agreement of JXTA in standard be not by strict difinition, so their function can be expanded to support concrete demand.Utilize JXTA platform realization shared file system can realize strengthening autgmentability and the robustness of shared system.
Therefore, be necessary to provide a kind of P2P file sharing method based on the JXTA platform to satisfy existing demand.
Summary of the invention
The purpose of this invention is to provide a kind of P2P file sharing method based on the JXTA platform with good robustness and extensibility.
The invention provides a kind of P2P file sharing method based on the JXTA platform, may further comprise the steps: step 1: start the JXTA platform, add peer node; Step 2: judge whether to create peer-group according to node, be then to change step 4, otherwise change step 3; Step 3: add peer-group, node need add a peer-group, is used for shared resource, changes step 5; Step 4: create peer-group and issue the peer-group bulletin, change step 5; Step 5: select COS, if create file-sharing service and issue bulletin, then create file-sharing service and issue bulletin; If the inquiry file request is then inquired about and transfer files; If select to withdraw from, then log off.
Preferably, described step 1 further comprises: step 11: start the JXTA platform, carry out the initial work of platform; Step 12: start the service of discovery, the service of discovery mainly is based on the discovery strategy of convergent point in JXTA, and the multicasting technology that is divided into double-layer structure is found; Step 13: send and find announcement, node is on every side found announcement, in local area network (LAN), can carry out broadcast transmission, perhaps utilize existing node listing to send; Step 14: processing response, local information is upgraded in returning of announcement then.
Preferably, the foundation of peer-group and issue further comprise in the described step 3: step 31: start JXTA and find service; Step 32: obtain the local cache peer group data, if node has been in the file-sharing group, then add in the corresponding group according to its historical information; Step 33: create new peer-group; Step 34: produce corresponding groups of nodes bulletin, if node has been created new groups of nodes, then the node in original group or the part of nodes of node appointment are announced; Step 35: publisher node group bulletin.
Preferably, in the described step 5, the client of request service comprises to the process of the service end transfer files that service is provided: step 51: the JXTA platform of opening service end; Step 52: create JXTASocket at the JXTA of service end platform, enter into the connection status of waiting for client; Step 52: client is created JXTASocket, carries out connection request then; Step 53: after service end and client connect, carry out the read-write of data, carry out writing of data with the write function, carry out reading of data with the read function, close connection with the close function.
Compared with prior art, the P2P file sharing method based on the JXTA platform of the present invention, JXTA has defined framework and the service of a lot of cores, has freed the burden of application and development greatly.Adopt the p2p framework of JXTA platform, utilize the versatility of JXTA platform, sustainable exploitation and the good transplantability of system have been guaranteed, adding, foundation and issue peer-group, adding peer-group, file polling, establishment file-sharing service, establishment file service by node shared bulletin, message sends and file transfer, makes file system have more distribution character and good autgmentability.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the JXTA platform of the embodiment of the invention;
Fig. 2 is that the embodiment of the invention is based on the flow chart of the P2P file sharing method of JXTA platform;
The flow chart that Fig. 3 node adds;
Fig. 4 is the flow chart of establishment and the issue of peer-group;
Fig. 5 is the flow chart that carries out the system resource inquiry;
Fig. 6 is the flow chart of file transfer.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtain under the creative work prerequisite.
With reference to figure 1, the embodiment of the invention based on the P2P file sharing method of JXTA platform based on the JXTA platform, the JXTA platform is made up of three different levels, ground floor is core layer, has comprised the Core Feature that is serviced use; The second layer is service layer, and the access services to the JXTA agreement is provided; Last application layer applications uses these to serve to obtain the JXTA network.Core layer has comprised the key concept of JXTA, for example peer node, peer-group, bulletin, pipeline, end points and safety.Service layer comprises inquiry, discovery, transfer.Application layer comprises typical cases such as resource-sharing, instant messaging, collaborative work and uses.Service layer is for convenience upper layer application and the existing strategy developed, for example inquires about, discovery, transfer etc., provides these services can alleviate the development effort of upper layer application; But be every kind of service all must, the service that different application oneself need can be selected also can oneself be developed service fully again.
The P2P shared file system is primarily implemented in and searches for shared file in the network, and supports to search for generally.When searching qualified file, system can list all qualified filenames.Can select user at this moment the file that need obtain, system can automatically find the computer (peer-to-peer just) at file place and connect and finish the transmission of file then.In transmission course, the user can also carry out session with the computer at file place, with the interchange of being correlated with.
With reference to figure 2, the P2P file sharing method based on the JXTA platform of the embodiment of the invention comprises the steps:
Step 1: start the JXTA platform, add peer node;
Step 2: judge whether to create peer-group according to node, be then to change step 4, otherwise change step 3;
Step 3: add peer-group, node need add a peer-group, is used for shared resource, changes step 5;
Step 4: create peer-group and issue the peer-group bulletin, change step 5;
Step 5: select COS, if create file-sharing service and issue bulletin, then create file-sharing service and issue bulletin; If the inquiry file request is then inquired about and transfer files; If select to withdraw from, then log off.
When the formation that starts JXTA at a node is, at first come initialization platform peer-group and network peer-group by the getNetPeerGroup () method in the NetworkManager class, start JXTA at last.Wherein NetPeerGroup is the group that all peer-to-peer acquiescences of JXTA add.Obtaining the discovery service of JXTA then, and externally issuing initiation message, and the discovery event is being intercepted.Its flow process is as shown in Figure 3, and is specific as follows:
Step 11: start the JXTA platform, carry out the initial work of platform;
Step 12: start the service of discovery, the service of discovery mainly is based on the discovery strategy of convergent point in JXTA, and the multicasting technology that is divided into double-layer structure is found;
Step 13: send and find announcement, node is on every side found announcement, in local area network (LAN), can carry out broadcast transmission, perhaps utilize existing node listing to send;
Step 14: processing response, local information is upgraded in returning of announcement then.
Among the JXTA, service all is to be based upon on the contextual prerequisite of peer-group, wants to realize discovery, access services, must add corresponding peer-group.JXTA allows a peer-to-peer to belong to one or belong to a plurality of peer-to-peers simultaneously, and peer-to-peer also can be created one or more peer-group.Issue by the peer-group announcement during issue of peer-group realizes, finds that by finding service peer-group just can obtain the information of this peer-group, and with its be cached to catalogue .jxta cm under the jxta-WorldGroup.After starting the JXTA platform, peer-to-peer joins among the acquiescence peer-group NetPeerGroup automatically.The establishment of peer-group realizes by the newGroup () method in the PeerGroup class, getAllPurposePeerGroupImplAdvertisement () method by the acquiescence peer-group obtains an original announcement, the user can expand this announcement according to own needs, use the service of discovery to issue the peer-group announcement at last, finish foundation and the issuing process of peer-group, the foundation of concrete peer-group and issue flow process are with reference to figure 4:
Step 31: start JXTA and find service;
Step 32: obtain the local cache peer group data, if node has been in the file-sharing group, then add in the corresponding group according to its historical information;
Step 33: create new peer-group;
Step 34: produce corresponding groups of nodes bulletin, the service among the JXTA is all notified by the bulletin form, when node has been created new groups of nodes, should announce to the node in original group or the part of nodes of node appointment;
Step 35: publisher node group bulletin.
In the system of the embodiment of the invention, peer-to-peer adds and withdraws from a peer-group and realize by member service.Peer-to-peer is created the identity of oneself in the member service permission group, and peer-group can be issued the certificate of this identity authority of sign after identity is created.Member service differentiates to give which type of authority to this peer-to-peer by identity.When peer-group of a peer-to-peer establishment, the member service of peer-group assigns the interior default temporary identity of a group to give this peer-to-peer.This identity only has the authority of creating a true identity usually.The mode of the certificate of authority is whether be certain group membership's foundation to member service if being used to differentiate peer-to-peer.The certificate of authority provides two important information: request authorization method and the identity information that offers the authorization method use.The process that adds peer-group: the object that at first generates the AuthenticationCredential class, obtain the peer-group certificate of authority, use PeerGroup.getMembershipService () method to obtain the membership qualification service of peer-group, the MembershipService.apply () method of the certificate of authority being passed to the qualification service obtains the peer-to-peer identity, joins this peer-group.
The existence that at all just is to converge in its network peer-to-peer of JXTA discovery strategy.Converge peer-to-peer by the diffusion by multiple existing request, realized the discovery of JXTA resources in network.Converge peer-to-peer and can accept discovery request from other peer-to-peers, converge peer-to-peer simultaneously and can not converge peer-to-peer to finding that request be made also request message to be spread to other under the corresponding situation at oneself.As the transmitter who finds message, if converge peer-to-peer do not have request message it all can spread this request as a result.The default discovery strategy based on converging peer-to-peer is the basis of realizing other discovery strategies.
In the query script based on the P2P file sharing method of JXTA platform, when peer-to-peer was initiated query requests, request message at first can be sent to other peer-to-peers (passing through ip multicast) of same subnet.If the peer-to-peer in the subnet is cached with the result of query messages, this peer-to-peer just directly returns the result as replying so.If the peer-to-peer of subnet is not replied, so just request message is sent to one and converge peer-to-peer, converge whether peer-to-peer is checked query messages in the local cache of oneself result, if any, just structure is initiated peer-to-peer as replying the request of returning to, and no longer request message is spread.If converge the result that peer-to-peer does not have request, will select this time its known peer-to-peer that converges that request message is spread out so, up to jumping figure (the being similar to TTL) arrival of the result who obtains asking or message diffusion.
Fig. 5 has illustrated the process of querying node resource in the system.The request of finding is from Peer1, and it at first uses ip multicast will find that request sends to Peer2 and the Peer3 of same subnet.If Peer2 and Peer3 have the result of the request of discovery, they just directly return to Peer1 with the result.If do not find the result of request, Peer1 will send to one with the request of finding and converge peer-to-peer.Be cached with the result that method is asked mutually if converge peer-to-peer, it just returns to Peer1 with the result so, and discovery procedure finishes.And if barren words just will be found to ask to spread out.If obtained the result, again one-level level is as a result returned to the promoter Peer1 of the request of discovery.Need in addition to mention, except being in the Peer2 and Peer3 of same subnet with Peer1, that can receive the request of discovery beyond subnet has just only converged peer-to-peer.
In the JXTA environment, the work that finish file-sharing just must provide the service of a file-sharing.Its operation principle is such: the peer-to-peer of searching shared file when needs searches the announcement of file-sharing service in the P2P network after, can arrive file-sharing service, search and the transmission method that so just can utilize service to provide come search file and receive file.
File-sharing service has been arranged, and other peer-to-peers on the JXTA network want to use this service, just file-sharing service must be released.Because any resource and service all must be issued with the form of bulletin in JXTA.Therefore we are necessary for file-sharing service and create corresponding file-sharing service bulletin.The attribute of peer-to-peer and be used for transfer files and announce titles for two pipelines that the peer-to-peer dialogue is used under the listed files that the information that comprises in the file-sharing service bulletin is provided by this Service Instance, the Service Instance.
In JXTA, message all is to transmit by the pipeline that connects the peer-to-peer two ends.The JXTA pipe service provides the mechanism of creating and visiting pipeline.Pipeline is for providing simple, indirectly connected asynchronous communication passage to two peer-to-peers.A peer-to-peer wants to accept the message that transmits of other peer-to-peers, just must at first set up an input channel, and structure changes output channel and an announcement thereof that links to each other with this pipeline then, will announce issue at last.Other peer-to-peer is set up output channel after searching this announcement, and this output channel just can send a message to corresponding input channel, realizes the communication between peer-to-peer.
With reference to figure 6, any one node all is equality among the JXTA, but in that moment of service, still has role's differentiation, and what namely request was served is client, and the service end that is called of service is provided.But node is to have service end client is arranged again.The file transfer flow process of native system is based on JxtaSocket's, and process is as follows:
Step 51: the JXTA platform of opening service end;
Step 52: create JXTASocket at the JXTA of service end platform, enter into the connection status of waiting for client;
Step 52: client is created JXTASocket, carries out connection request then;
Step 53: after service end and client connect, carry out the read-write of data, carry out writing of data with the write function, carry out reading of data with the read function, close connection with the close function.
Compared with prior art, the P2P file sharing method based on the JXTA platform of the present invention, JXTA has defined framework and the service of a lot of cores, has freed the burden of application and development greatly.Adopt the p2p framework of JXTA platform, utilize the versatility of JXTA platform, sustainable exploitation and the good transplantability of system have been guaranteed, adding, foundation and issue peer-group, adding peer-group, file polling, establishment file-sharing service, establishment file service by node shared bulletin, message sends and file transfer, makes file system have more distribution character and good autgmentability.
More than the P2P file sharing method based on the JXTA platform that the embodiment of the invention is provided, be described in detail, used specific case among the present invention principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. the P2P file sharing method based on the JXTA platform is characterized in that, may further comprise the steps:
Step 1: start the JXTA platform, add peer node;
Step 2: judge whether to create peer-group according to node, be then to change step 4, otherwise change step 3;
Step 3: add peer-group, node need add a peer-group, is used for shared resource, changes step 5;
Step 4: create peer-group and issue the peer-group bulletin, change step 5;
Step 5: select COS, if create file-sharing service and issue bulletin, then create file-sharing service and issue bulletin; If the inquiry file request is then inquired about and transfer files; If select to withdraw from, then log off.
2. the P2P file sharing method based on the JXTA platform as claimed in claim 1 is characterized in that described step 1 further comprises:
Step 11: start the JXTA platform, carry out the initial work of platform;
Step 12: start the service of discovery, the service of discovery mainly is based on the discovery strategy of convergent point in JXTA, and the multicasting technology that is divided into double-layer structure is found;
Step 13: send and find announcement, node is on every side found announcement, in local area network (LAN), can carry out broadcast transmission, perhaps utilize existing node listing to send;
Step 14: processing response, local information is upgraded in returning of announcement then.
3. the P2P file sharing method based on the JXTA platform as claimed in claim 1 is characterized in that, the foundation of peer-group and issue further comprise in the described step 3:
Step 31: start JXTA and find service;
Step 32: obtain the local cache peer group data, if node has been in the file-sharing group, then add in the corresponding group according to its historical information;
Step 33: create new peer-group;
Step 34: produce corresponding groups of nodes bulletin, if node has been created new groups of nodes, then the node in original group or the part of nodes of node appointment are announced;
Step 35: publisher node group bulletin.
4. the P2P file sharing method based on the JXTA platform as claimed in claim 1 is characterized in that, in the described step 5, the client of request service comprises to the process of the service end transfer files that service is provided:
Step 51: the JXTA platform of opening service end;
Step 52: create JXTASocket at the JXTA of service end platform, enter into the connection status of waiting for client;
Step 52: client is created JXTASocket, carries out connection request then;
Step 53: after service end and client connect, carry out the read-write of data, carry out writing of data with the write function, carry out reading of data with the read function, close connection with the close function.
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Application publication date: 20130828 |