CN101557421B - A network file distribution method and system thereof - Google Patents

Abstract

The invention discloses a method for distributing a network file, and a system thereof. The method comprises the steps of: pre-configuring a network file distribution tree according to service coverage, adopting leaf nodes of the distribution tree to represent network nodes and leading other nodes to represent the service coverage, and ensuring that the service coverage corresponding to a lower-level node is within the service coverage corresponding to an upper-level node; when a network file needs to be distributed, executing the following steps of: selecting the node corresponding to the service coverage, to which the network file belongs, from the network file distribution tree. and generating a network file distribution task including a list of network files to be distributed and information of all network nodes within the service coverage corresponding to the selected node; and sending the network files included in the task to the network node according to a file access request initiated by the network nodes included in the network file distribution task. By adopting the invention, the network file can be distributed according to service coverage so as to simplify the configuration process of network file distribution and enhance the efficiency of network file distribution.

Description

A network file distribution method and system thereof

technical field

The invention relates to the communication field, in particular to a network file distribution method and a network file distribution system.

Background technique

The application of distributing files through the network is very extensive, which meets the needs of users to share data. There are usually two types of network distribution files: one is manual distribution, for example, a shared directory is provided in the local area network, and the person who needs the file actively accesses the shared directory and uses operations such as file copy to obtain the required network files; the other is The link information of all accessible network files is provided through the webpage, and the user browses the webpage, selects the network file to be accessed and initiates an access request, and then establishes a point-to-point connection between the data sending end on the server side and the receiving end on the client side Data transmission, which transfers the files required by the user to the client where the user is located.

Existing network file distribution systems usually adopt a server-client (C/S mode) architecture, that is, all services are concentrated on one (group) service, and the client can only obtain resources from the server, which is a centralized one-way network data distribution application.

One of the requirements for the network file distribution system is to send relevant network files to the corresponding clients in a targeted manner according to specific business needs, and the business rules (such as the scope of network file distribution) and specific content are often changed. The file distribution system should also adapt to changes in business rules, and provide a simple and convenient network file distribution configuration method, so that relevant network files can be sent to corresponding clients in a targeted manner. However, the above-mentioned existing network file distribution system cannot meet this demand through manual distribution and the way of client users selecting access.

Contents of the invention

Embodiments of the present invention provide a network file distribution method and a network file distribution system, so as to realize simple and convenient distribution of network files according to service coverage and business rules.

The network file distribution method provided by the embodiment of the present invention includes:

Configure the network file distribution tree in advance according to the service coverage, the leaf nodes of the network file distribution tree represent network nodes, other nodes represent the service coverage and the service coverage corresponding to the lower nodes is within the service coverage corresponding to the upper nodes ; When there are network files to be distributed, perform the following steps:

Select a node corresponding to the service coverage area to which the network file belongs from the network file distribution tree and generate a network file distribution task, which includes a list of network files to be distributed and the service coverage area corresponding to the selected node Information of all network nodes;

According to the file access request initiated by the network node in the network file distribution task, the network file in the task is sent to the network node.

Further, the network file in the network file distribution task is sent to the network node, specifically: through the server storing the network file in the network file distribution task or/and the network file in the network file distribution task Other network nodes send the network file to the network node that initiates the file access request.

The network file distribution system provided by the embodiment of the present invention includes:

The system configuration module is used to configure the network file distribution tree according to the service coverage in advance, the leaf nodes of the network file distribution tree represent network nodes, other nodes represent the service coverage and the service coverage corresponding to the lower nodes is in its upper node Within the corresponding business coverage;

The task arrangement module is used to select a node corresponding to the service coverage area to which the network file belongs from the network file distribution tree when there is a network file to be distributed, and generate a network file distribution task, which includes the network file to be distributed A list of files and information of all network nodes within the service coverage corresponding to the selected node;

The file distribution module is configured to send the network file in the task to the network node according to the file access request initiated by the network node in the network file distribution task.

In the foregoing embodiments of the present invention, by configuring the network file distribution tree, the service coverage described by the lower nodes of the tree is within the service coverage described by the upper node, so that when distributing network files, by Select the node corresponding to the service coverage area to which the network file to be distributed belongs, generate a network file distribution task for the network file to be distributed, and send the network file to be distributed according to the generated network file distribution task. Since the network file distribution tree is configured according to the service coverage, each node represents a certain service coverage, so the corresponding service coverage can be selected by selecting the appropriate node in the tree according to the business rules, and the files to be sent The network file of is sent to all network nodes within the range. When the business rules of network file distribution change, as long as the appropriate node is selected again in the network file distribution tree according to the corresponding business rules, the network files to be sent can be sent to the desired business coverage, and can be done once A network file distribution tree is configured, and the network file distribution tree is used multiple times to configure network file distribution according to changes in business rules. Compared with the prior art, it realizes the distribution of network files according to the service coverage and the simple and convenient configuration of network file distribution according to the change of business rules, improves the efficiency of file distribution, and simplifies the configuration process of file distribution. Further, sending the network file to the network node that initiates the file access request through the server that stores the network file in the network file distribution task or/and other network nodes in the network file distribution task can fully Utilize the data sharing mechanism based on P2P network architecture, so as to improve the efficiency of file distribution and simplify the configuration process of file distribution, further improve the efficiency of file transfer and reduce the load on the server.

Description of drawings

FIG. 1 is a schematic structural diagram of a network file distribution system provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a network file distribution process provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a network file distribution tree in an embodiment of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to FIG. 1 , it is a schematic structural diagram of a network file distribution system provided by an embodiment of the present invention. The network file distribution system includes: a system configuration module 101 , a task arrangement module 102 and a file distribution module 103 . The system configuration module 101, the task arrangement module 102 and the file distribution module 103 can be co-located on one server, and can also be deployed in different servers in any combination, wherein:

The system configuration module 101 mainly provides the service coverage area configuration and the configuration function of the network file receiving end, and is mainly responsible for configuring the network file distribution tree according to the service coverage. Within the service coverage of the distribution tree, the leaf node of the distribution tree represents the network node within the corresponding service coverage, and the network node is the network file receiving end node;

The task arrangement module 102 is mainly responsible for generating a network file distribution task and publishing the generated network file distribution task according to business rules and configured network file distribution tree and network files to be distributed;

The file distribution module 103 is mainly responsible for sending the network file to be distributed in the task to the requesting network node according to the access request initiated by the network node in the network file distribution task.

The business coverage mentioned here refers to the business deployment planning, such as the areas involved in the business and the network nodes involved. Among them, the business coverage can be divided into multiple levels according to the business needs, and each level represents the corresponding business Coverage, the upper level covers the business coverage of the next level. The service coverage area can be a geographical area of a region or a cross-regional area. Network nodes under the same service coverage area usually undertake the same business function or service, and thus have the same service configuration requirements. The business rules mentioned here refer to distributing network files to network nodes in the corresponding business coverage area according to the business functions or services undertaken by the network nodes, and each distribution of network files may be based on the same or different business rules.

The following describes the network file distribution process provided by the embodiment of the present invention with reference to FIG. 2 .

Referring to FIG. 2 , it is a schematic diagram of a network file distribution process provided by an embodiment of the present invention. The process mainly includes:

Step 201, configure a network file distribution tree according to service coverage.

In this step, the network file distribution tree configured by the system configuration module 101 according to the service coverage includes a root node, a leaf node, and intermediate nodes between the root node and the leaf nodes. The intermediate nodes may include one level or multiple levels. Among them, the root node is used to describe the total scope of service coverage; the leaf node is used to describe the network node information, and the network node described by the leaf node is the receiving end network node of the distributed network file; the intermediate node is used to describe the network nodes within the total service coverage subrange. The layer below the root node can define several first-level sub-range nodes as intermediate nodes, and a number of second-level sub-range nodes can be defined under a first-level sub-range node, and iterates in this way until a certain node is set as a leaf node until. Intermediate nodes are used to define attributes of a hierarchical sub-range, such as service coverage descriptions; leaf nodes are used to define attributes of network nodes receiving network files, such as network node addresses, identification codes, names, or geographical regions. The superposition of the service coverage attributes described by the nodes passing through the path from the root node to the leaf node is the service coverage attribute to which the leaf node belongs. Theoretically, the hierarchy of the network file distribution tree can be expanded infinitely, which provides a basis for the definition and adjustment of business rules.

Fig. 3 shows a structure diagram of a network file distribution tree. As shown in FIG. 3 , the network file distribution tree includes a root node 301 , intermediate nodes 302 , 303 , 306 , 308 , and 309 , and leaf nodes 304 , 305 , 307 , and 310 . The root node 301 describes the total scope of service coverage, which is divided into multiple first-level sub-scopes. In Figure 3, the intermediate nodes 302 and 308 describe the first-level sub-scope, and the first-level sub-scope can be divided into multiple Second-level sub-range, described by intermediate nodes 303, 306, 309 in Figure 3, the second-level sub-range includes one or more network nodes, in Figure 3 with nodes 304, 305, 307, 310 Indicates that the nodes 304, 305, 307, 310 describe the information of the corresponding network nodes, and the network node information may include the network addresses or/and node identifiers of the nodes.

Step 202: Generate a network file distribution task according to the service coverage area to which the network file to be distributed belongs and the network file distribution tree.

In this step, in order to generate a network file distribution task, the task arrangement module 102 can be used to select the network file distribution tree representing the range according to the business rules adopted this time, that is, the business coverage to be reached by the network file to be distributed. The node then executes a network file distribution task generation instruction to generate a network file distribution task list. The node selected from the network file distribution tree may be a root node, or one or more intermediate nodes, or a leaf node, or may include intermediate nodes and leaf nodes. If the root node is selected, the network file to be distributed will be distributed to all leaf nodes within the service coverage indicated by the root node; if an intermediate node is selected, the network file to be distributed will be distributed to the All leaf nodes; if a leaf node is selected, the network file to be distributed will be directly distributed to the leaf node. In this way, the system administrator can conveniently select the receiving end within the service coverage, and the granularity of its management and selection can be as coarse as the root node (that is, all network nodes) and as fine as a leaf node (that is, a network node). Provides convenient adjustment means according to the needs of business distribution network files.

Since the distribution of network files is usually based on a service package rather than a specific file, the task arrangement module 102 provides a task order arrangement function to generate a network file distribution order based on a service package. The generated network file distribution task list includes a list of network files to be distributed in units of service packages and information of all receiving end network nodes (such as network node identifiers or network addresses) of files in the network file list. The network file list describes the information of the network file to be distributed (such as file name, file size, file storage location, etc.), and the list can also include service usage information (such as the playing time of the network file, etc.), which information is specifically included Defined by business system needs. The network file distribution task list also includes service coverage information, and the service coverage is the service coverage described by the node selected from the network file distribution tree. The task arrangement module 102 saves the generated network file distribution task list to a specified storage location. Preferably, the network file distribution task is stored in a network node accessible to all leaf nodes in the network file distribution tree, such as a globally visible server .

Step 203, the network node in the network file distribution task initiates a file access request according to the network file distribution task.

In this step, there are multiple ways to trigger the network node to initiate a file access request, and the embodiment of the present invention provides the following triggering ways:

Mode 1: Triggered by the network node automatically querying the network file distribution task related to itself. In this mode, all leaf nodes in the network file distribution tree periodically query the network file distribution task from the network node storing the network file distribution task. If the network node contained in one or some network file distribution tasks (that is, the receiving end node of the network file to be distributed) is found to include the node itself, a request is initiated to access the network file in the task;

Method 2: Triggered by a notification message sent by the network file distribution system. In this method, the task arrangement module 102 generates a network file distribution task and then sends a notification to the network nodes in the task, and the network node that receives the notification initiates a request to access Network files in this task.

Before the network node initiates a file access request, a network file download task can be generated according to the network file distribution task. The download task includes a file list, and the files included in the file list are the same as those included in the file list in the distribution task. The policy initiates a file access request when performing the download task.

Step 204: Send the network file to be distributed to the network node according to the file access request initiated by the network node.

In this step, after the file distribution module 103 receives the file access request initiated by the network node, it obtains the file from the designated source storage location according to the name of the file to be distributed, the source storage location information, and the network node information that initiated the request listed in the task list. The network file to be distributed and sent to the network node. If the task order is also used in the business system of the receiving end network node, the task order itself can also be put into the distribution task order as a file task, so as to be distributed to the receiving end network node together. The processing method is the same for the documents to be distributed in the task order.

In order to improve the efficiency of network nodes querying network file distribution tasks, the embodiment of the present invention may further generate an index record for the task after generating the network file distribution task, store the index record in the index table, and store the index table in the A network node accessible to all leaf nodes in the network file distribution tree. The generated index record includes the identification or/and access address of the corresponding network file distribution task list, and also includes the network node information listed in the task list (ie, the identification or/and network address of the receiving end node of the network file, etc.) , the index record may also include information about the service coverage of the corresponding network file distribution task (that is, the service coverage represented by the selected node in the distribution tree).

Correspondingly, in the triggering method of automatically querying the network file distribution tasks related to itself through the network nodes, the query object of the network nodes is the index record of the network file distribution task, and the index record includes the business of the corresponding network file distribution task In case of coverage information, it can be preliminarily judged based on the information whether the node itself belongs to the coverage of the service, and if so, further judgment can be made based on the network node information contained in the index table; information to make judgments. Since index records may contain a large amount of network node information, more system resources will be occupied if one-to-one comparison is performed. The above method of preliminary judgment can reduce the occupation of system resources, thereby improving query efficiency.

When configuring the network file distribution tree, you can also assign a node ID to each tree node, wherein the ID of the lower node is set according to the ID of the upper node to include the service coverage represented by the upper node. In this way, the ID of the leaf node is The path from the root node to the leaf node can be indicated, that is, the service coverage of the leaf node and the position of the leaf node in the network file distribution tree can be indicated. Correspondingly, the index record may include the node ID of the receiving end node of the network file in the network file distribution tree, so that when the network node queries the index record, it can use the position in the network file distribution tree indicated by the node ID and According to the corresponding service coverage, it is preliminarily judged whether the node itself belongs to the service coverage, so as to improve the query efficiency.

In the above process, in order to reduce repeated requests for the same network file distribution task, so as to reduce network load, the embodiment of the present invention can further increase the generation time of the network file distribution task in the network file distribution task list or the corresponding index record, and correspondingly Yes, after the network node generates the download task, correspondingly record the generation time of the corresponding network file distribution task. In this way, when the network node judges that the network node has not generated a corresponding network file download task according to the generation time (such as the generation time corresponding to the latest generated download task in the network node is earlier than the network file distribution task queried by the network node generation time) to initiate an access request again, thereby avoiding re-initiating an access request for a network file distribution task that has been downloaded.

In the above process of the embodiment of the present invention, once the network file distribution tree is established according to the service coverage, if the service coverage does not change, each time the network file is distributed, it can be based on the network file distribution tree and the time According to the business rules, select the appropriate business coverage for distribution, so that when the business rules change, you only need to re-select the appropriate tree node in the network file distribution tree to configure the distribution range, so that the file distribution configuration process is simple and convenient, and then you can Improve network file distribution efficiency.

When the service coverage needs to be changed, a network file distribution tree can be established according to the new service coverage, and network files can be distributed based on the newly established network file distribution tree. It is also possible to establish different network file distribution trees in advance according to different business coverage areas, select the corresponding network file distribution tree when distributing network files, and distribute network files based on the selected network file distribution tree.

The network file distribution system in the embodiment of the present invention also provides functions such as modification, deletion, and update of the network file distribution tree. The system administrator can modify the established network file distribution tree through the system configuration module 101 according to the change of the service coverage. When the system administrator needs to modify the network file distribution tree according to the newly added business network nodes, he can expand the service coverage of a certain level by adding nodes of the same layer at any layer of the network file distribution tree, or by adding the lower layer nodes to increase the depth of business coverage levels. When adding a node, if the added node is not a leaf node, adding a lower node means adding a subtree with the newly added node as the root node. When deleting a node, if the deleted node is not a leaf node, the deletion operation means deleting a subtree rooted at the node. The update operation refers to modifying the attribute description information of a node.

The above-mentioned system can be realized mainly through software, wherein, the system configuration module 101 can provide a user interaction interface, through which the system administrator can configure the network file distribution tree, and the operation of configuring network files can include creating, modifying, deleting, updating and other operations . The task arrangement module 102 can also provide a user interaction interface, through which the system administrator can select the network files to be distributed, and select the destination network nodes of these files to be distributed according to the configured network file distribution tree, thereby generating a network file distribution task , for example, after selecting the network file to be distributed, select one or more nodes from the network file distribution tree to select the distribution scope of the task order, and then execute the command to generate the task order, according to the network file to be distributed and the selected The business coverage represented by the node generates a network file distribution task list.

The above-mentioned embodiments of the present invention can be used in conjunction with the data sharing mechanism of the P2P network, or applied to the P2P network. When the embodiment of the present invention is applied to the P2P network architecture or used in conjunction with the data sharing mechanism of the P2P network, after the user's data access client (also called a network node) logs into the data access system, it can automatically initiate file access request. Moreover, the data sharing mechanism of the P2P network can be used to establish a data sharing connection according to the network node information (such as the address or/and identification of the network file receiving end node) listed in the network file distribution task list, so that the file access request can be initiated. The client node of can obtain network files from other client nodes that are peers and belong to the same network file distribution task. Since the client nodes belonging to the same network file distribution task are usually distributed with the same network file, therefore, according to the network file distribution task list and using the data sharing mechanism of the P2P network to establish a data sharing connection, it can be targeted for those requesting data access. Network nodes provide continuous data access services, and can improve the efficiency of network file distribution and reduce server-side load.

In summary, the embodiment of the present invention establishes a network file distribution tree based on business coverage, and configures the distribution range of network files according to business rules, thereby generating a network file distribution task, which can simplify the configuration operation of network file distribution and improve network file distribution. The flexibility of distribution configuration; through network nodes to automatically initiate file access requests according to network file distribution tasks, it can realize the automation of network file distribution and improve the efficiency of network file distribution; based on the network file distribution task list and through data sharing based on P2P network The mechanism distributes network files, which can reduce network load, reduce bandwidth resource requirements of network file senders, and improve file transfer efficiency.

It should be noted that the method of dividing the functional modules of the network file distribution system described in the embodiment of the present invention is not the only way, any combination of the above three functional modules, or the situation that the same function can be completed but the names of the above functional modules are different , should be within the protection scope of the present invention.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (16)

1. A network file distribution method, characterized in that the network file distribution tree is configured in advance according to the service coverage, the leaf nodes of the network file distribution tree represent network nodes, other nodes represent service coverage and the corresponding subordinate nodes therein The service coverage is within the service coverage corresponding to its superior node; when there are network files to be distributed, perform the following steps: Select a node corresponding to the service coverage area to which the network file belongs from the network file distribution tree and generate a network file distribution task, which includes a list of network files to be distributed and the service coverage area corresponding to the selected node Information of all network nodes; According to the file access request initiated by the network node in the network file distribution task, the network file in the task is sent to the network node. 2. The method according to claim 1, further comprising: storing the task into a network node accessible to all leaf nodes in the network file distribution tree after the network file distribution task is generated; The network node in the network file distribution task initiates a file access request, including: All leaf nodes in the network file distribution tree regularly query network file distribution tasks from network nodes that store network file distribution tasks, and when they find out the task of distributing network files to network nodes including themselves, initiate a request to access the Network files in tasks; Alternatively, after the network file distribution task is generated, a notification is sent to the network nodes in the task, and the network node receiving the notification initiates a request to access the network file in the task. 3. The method according to claim 2, wherein the network file distribution task also includes the generation time of the task; initiating a request to access the network file in the task includes: When it is judged according to the generation time of the network file distribution task that the network node has not generated a corresponding network file download task, the request is initiated. 4. The method according to claim 1, further comprising: generating index information of the network file distribution task after generating the network file distribution task, and storing the index information in all the network file distribution tree A network node that can be accessed by leaf nodes, the index information includes the identification or access address of the corresponding network file distribution task, and the network node information in the task; The network node in the network file distribution task initiates a file access request, including: All the leaf nodes in the network file distribution tree regularly query the index information from the network nodes that store the index information of the network file distribution task, and when they find out that they belong to the network nodes in the index information, they initiate Request to access the network files in the corresponding network file distribution task; Alternatively, after generating the network file distribution task, a notification is sent to the network node in the index information, and the network node receiving the notification initiates a request to access the corresponding network file according to the identifier or access address of the network file distribution task list in the corresponding index information Network files in distribution tasks. 5. The method according to claim 4, wherein the index information also includes the service coverage information of the network nodes in the corresponding network file distribution task; when the leaf nodes in the network file distribution tree query the index information, first according to The service coverage information judges whether the self belongs to the service coverage, and only inquires whether the self belongs to the network node in the index information when the judgment is yes; Or, the index information also includes the node identifier of the network node in the network file distribution tree corresponding to the network file distribution task, and the node identifier indicates the position of the node in the network distribution tree; the leaf in the network file distribution tree When a node queries index information, it first judges whether it belongs to the service coverage area according to the node identifier, and only inquires whether it belongs to the network node in the index information when the judgment is yes. 6. The method according to claim 4, wherein the index information also includes the generation time of the corresponding network file distribution task; initiating a request to access the network file in the corresponding network file distribution task includes: When it is judged according to the generation time of the network file distribution task that the network node has not generated a corresponding network file download task, the request is initiated. 7. The method according to claim 3 or 6, wherein the network node records the generation time of the network file distribution task corresponding to the network file download task; according to the generation time, it is judged that the network node has not generated The corresponding network file download task is as follows: If the generation time of the network file distribution task corresponding to the network file download task of the network node is later than the generation time of the network file distribution task queried by the network node, the network node considers that the queried network file distribution task is not The task generates a network file download task; When judging that the network node does not generate a corresponding network file download task, initiating the request includes: When the network node judges that no corresponding network file download task is generated, a network file download task is generated according to the corresponding network file distribution task and correspondingly records the generation time of the network file distribution task, and the network file list in the download task is the same as The network files included in the network file list in the network file distribution task are the same; The network node initiates a file access request according to the network file download policy to request to download the network file in the network file list of the download task. 8. The method according to claim 1, wherein the network file in the network file distribution task is sent to the network node, specifically: The network file is sent to the network node that initiates the file access request through the server storing the network file in the network file distribution task or/and other network nodes in the network file distribution task. 9. The method according to claim 8, wherein the network file is sent to the network node that initiates the file access request through other network nodes in the network file distribution task, comprising: Establishing a connection between the network node and the network node that initiated the file access request by using a peer-to-peer network data sharing mechanism according to the network node information in the network file distribution task; The network node that establishes a connection with the network node that initiates the file access request sends the network file stored by it to the network node that initiates the file access request. 10. The method according to claim 1, further comprising: after configuring the network file distribution tree, updating the network file distribution tree according to changes in service coverage. 11. A network file distribution system, characterized in that, comprising: The system configuration module is used to configure the network file distribution tree according to the service coverage in advance, the leaf nodes of the network file distribution tree represent network nodes, other nodes represent the service coverage and the service coverage corresponding to the lower nodes is in its upper node Within the corresponding business coverage; The task arrangement module is used to select a node corresponding to the service coverage area to which the network file belongs from the network file distribution tree when there is a network file to be distributed, and generate a network file distribution task, which includes the network file to be distributed A list of files and information of all network nodes within the service coverage corresponding to the selected node; The file distribution module is configured to send the network file in the task to the network node according to the file access request initiated by the network node in the network file distribution task. 12. The system according to claim 11, wherein after the task arrangement module generates the network file distribution task, it is further configured to store the task in a network node accessible to all leaf nodes in the network file distribution tree , so that all the leaf nodes in the network file distribution tree periodically query the network file distribution task from the network nodes storing the network file distribution task, and when they find out the task of distributing network files to network nodes including themselves, initiate a request to access the network files in the task; Alternatively, after the task arrangement module generates the network file distribution task, it is further configured to send a notification to the network nodes in the task, so that the network nodes receiving the notification initiate a request to access the network file in the task. 13. The system according to claim 12, wherein the network file distribution task generated by the task arrangement module also includes the generation time of the task, so that the network node distributes the task according to the network file before initiating a request The generation time determines whether the network node generates a corresponding network file download task, and initiates the request when it is judged that it has not been generated. 14. The system according to claim 13, wherein after the task arrangement module generates the network file distribution task, it is further configured to generate index information of the network file distribution task, and store the index information in the network file A network node that all leaf nodes in the distribution tree can access, the index information includes the identification or access address of the corresponding network file distribution task, and the network node information in the task, so that all leaf nodes in the network file distribution tree Regularly query the index information from the network nodes that store the index information of the network file distribution task, and when the query finds that it belongs to the network node in the index information, initiate a request to access the corresponding network file distribution task according to the identification or access address in the index information network files in; Alternatively, after the task arrangement module generates the network file distribution task, it is also used to generate the network file distribution task index information, and send a notification to the network nodes in the index information, so that the network nodes that receive the notification The ID or access address of the ID or access address initiates a request to access the network file in the corresponding network file distribution task. 15. The system according to claim 14, wherein the index information generated by the task arrangement module also includes the generation time of the corresponding network file distribution task, so that the network node can, according to the network file before initiating a request, The generation time of the distribution task judges whether the network node generates the corresponding network file download task, and initiates the request when it is judged that it has not been generated. 16. The system according to claim 11, wherein after the system configuration module configures the network file distribution tree, it is further configured to update the network file distribution tree according to changes in service coverage.

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