JP2004356735A - Method, program, server and system for accessing network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a client on a WAN to conveniently access a server in a LAN through the WAN. <P>SOLUTION: Only by performing predetermined input processing on a Web screen for access, the client 106 accesses servers 12, 14 in the LAN system 30 by functions of CGI 111 and a client stub 112 in the Web server 110 and a broker 22 by the same procedure or technique as that of clients 20 in the LAN system 30, and a desired processing result is displayed on a screen of the client 106. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

「ｉｆ （！ｄｃｅ＿ｓｅｔｅｎｖ（”ｖｆｍ．ｅｎｖ”，ＮＵＬＬ，ＮＵＬＬ））」の部分は、環境ファイル１１３情報の読み込みステートメントを示している。このようなブローカアドレス情報の読み込みにより、ＣＧＩ１１１はブローカ２２との通信が可能となり、その結果、サーバ群１２，１４との通信（サーバ関数コール）が可能となる。ＣＧＩ１１１は、クライアント１０６から送信されたデータを解析し、共通変数配列にセットする（ステップＳ１８）。ステップＳ１８に対応するＣＧＩ１１１のプログラムコードの一例を示すと次のようになる。

【００２６】
次に、ＣＧＩ１１１は、サーバ関数のディスパッチ（割り当て）を行う。図２に示したように、クライアント１０６から受信したデータの最初のパラメータ名の値は「サーバ関数呼び出しルーチン名」となっており、２番目のパラメータ名の値は「表示ルーチン名」となっている。サーバ関数ディスパッチでは、最初のパラメータ値から呼び出すべきサーバ関数呼び出しルーチン名を判定し、更にその呼び出しを行う（ステップＳ２０）。
【００２７】
すると、呼び出されたサーバ関数呼び出しルーチン１１１Ａが実行され、サーバ関数コールが行われる。このとき、サーバ関数コールが初回のコールであるかどうかが判定される（ステップＳ２２）。その結果、初回であるときは（ステップＳ２２のＹｅｓ）、環境ファイル１１３から読み込んだアドレス情報を利用してブローカ２２にアクセスする（ステップＳ２４）。ブローカ２２は、呼び出すべきサーバのアドレス情報を、サーバアドレス情報一覧２２Ａから取得してＷｅｂサーバ１１０に出力する（ステップＳ２６）。Ｗｅｂサーバ１１０では、ＣＧＩ１１１の環境ファイル読込み関数を実行して、取得したサーバアドレス情報をメモリ内に格納保持する（ステップＳ２８）。
【００２８】
別言すると、ＣＧＩ１１１は、呼び出すサーバ関数名だけを認識してブローカ２２に問い合わせる。ブローカ２２は、問い合せがあった関数名のサーバがデータベースサーバ群１２内のサーバであれば、そのサーバのアドレス情報をＣＧＩ１１１に返し、ファンクショナルサーバ群１４内のサーバであれば、そのサーバのアドレス情報を同様にＣＧＩ１１１に返す。例えば、クライアント１０６が販売管理に関する問い合わせを行ったときは、ファンクショナルサーバ１４Ａのサーバ関数名のデータが、クライアント１０６からＷｅｂサーバ１１０に送られる。ＣＧＩ１１１は、クライアント１０６から送信されたデータを解析し、サーバ関数の呼び出しルーチン１１１Ａを実行し、ファンクショナルサーバ１４Ａのサーバ関数コールが行われる。そして、ファンクショナルサーバ１４Ａのアドレス情報が、ブローカ２２からＷｅｂサーバ１１０のＣＧＩ１１１に送られるという具合である。
【００２９】
その後、ＣＧＩ１１１は、クライアント１０６から受信したデータに含まれる関数パラメータを、コールするサーバ関数の引数にセットし（ステップＳ３０）、サーバ関数呼び出しルーチン１１１Ａ内でサーバ関数コールを発行する（ステップＳ３２）。該ステップＳ３０及びＳ３２に対応するＣＧＩ１１１のプログラムコードの一例を示すと次のようになる。

この関数コール発行により、クライアントスタブ１１２がＣＧＩ１１１によって呼び出されて実行され、ＬＡＮシステム３０内の該当するサーバに対するアクセスが行われる。すなわち、該当するサーバでは、クライアント１０６の入力データに対する処理が実行される。なお、クライアントスタブ１１２のプログラムコードの一例を示すと、次の通りである。

なお、２回目以降の同一サーバに対するサーバ関数コールでは、前記ステップＳ２８で記録したサーバアドレス情報を使用してブローカ２２を介することなく直接サーバ関数コールが発行される（ステップＳ２２のＮｏ）。
【００３０】
以上のように、クライアント１０６から要求があると、
（１）ブローカ２２に対して、ＬＡＮシステム３０内の所望するサーバのアドレス情報を問い合わせ、アドレス情報を取得する。
（２）次に、取得したアドレス情報を利用して、ＬＡＮシステム３０内の該当するサーバにアクセスする。
という手順による処理がＷｅｂサーバ１１０のＣＧＩ１１１及びクライアントスタブ１１２によって行われる。すなわち、Ｗｅｂサーバ１１０は、ＬＡＮシステム３０内のクライアント群２０とまったく同様の手順でＬＡＮシステム３０内のサーバ群１２，１４にアクセスする。
【００３１】
次に、サーバ関数コールの結果処理について説明する。この場合は、データ参照呼び出しか、データ登録／更新／削除呼び出しかによって、ＣＧＩ１１１における処理が分かれる。まず、データ参照呼び出しの場合は、サーバ関数コール完了後、サーバ関数呼び出しルーチン１１１Ａによって、サーバ呼び出し関数の引数に返された値を使用し、クライアント１０６から受信したデータの２番目のパラメータ値に対応するデータ表示ルーチン１１１Ｂを呼び出す。呼び出されたデータ表示ルーチン１１１Ｂは、渡された値を使用して表示用の編集処理を行い（ステップＳ３４）、その後Ｗｅｂサーバ１１０及びインターネット１０８を介してクライアント１０６に編集データを送信する（ステップＳ３６）。ステップＳ３４及びＳ３６に対応するプログラムコードの一例を示すと次の通りである。

クライアント１０６のＷｅｂブラウザは、受取った編集データを画面上に表示する（ステップＳ３８）。
【００３２】
一方、データ登録／更新／削除呼び出しの場合は、サーバ関数コール完了後、サーバ関数呼び出しルーチン１１１Ａによってサーバ呼び出し関数の戻り値により、データ登録／更新／削除処理の成功または不成功を判別する（ステップＳ４０）。そして、判別結果に対応するデータ表示ルーチン１１１Ｂを呼び出す。呼び出されたデータ表示用ルーチン１１１Ｂは、Ｗｅｂサーバ１１０及びインターネット１０８を介してクライアント１０６に表示データを送信する（ステップＳ４２）。クライアント１０６のＷｅｂブラウザは、受取った表示データを画面上に表示する（ステップＳ３８）。
【００３３】
＜実施形態の効果＞・・・このように、本実施形態によれば、次のような効果がある。
（１）インターネット１０８側のクライアント１０６からみると、アクセス用のＷｅｂ画面上で所定の入力処理を行うのみでＬＡＮシステム３０のサーバにアクセスすることができ、所望の処理結果を画面表示することができる。クライアント１０６とＷｅｂサーバ１１０との通信手順は、図２に示した第１番目及び第２番目のパラメータの部分が、一般的なＷｅｂ上における通信手順と異なるのみである。しかし、この部分は、クライアント１０６がＬＡＮシステム３０にアクセスする際のＷｅｂ画面情報に予め含まれており、クライアント１０６における表示画面上は隠れている。このため、クライアント１０６のユーザから見ると、従来のホームページ上における扱いとまったく同様であり、クライアント１０６側に特別なプログラムなどをまったく必要とすることなく、プライベートなＬＡＮシステム３０に対してインターネット１０８側から簡便にアクセスすることができる。
【００３４】
（２）Ｗｅｂサーバ１１０とブローカ２２との間の通信手順は、ＬＡＮシステム３０内のクライアント群２０とブローカ２２との間の通信手順とまったく同様である。このため、ＬＡＮシステム３０内のサーバ構成になんら変更を行うことなく、インターネット１０８上のクライアント１０６からアクセスが可能であり、サーバの増設，アップグレード，配置変更は、従来と同様に自由に行うことができる。
【００３５】
＜他の実施形態＞・・・本発明には数多くの実施形態があり、以上の開示に基づいて多様に改変することが可能である。例えば次のようなものも含まれる。
（１）前記実施形態では、ＣＧＩ及び（登録商標） Ｓｅｒｖｌｅｔを利用して、ブローカ２２に対するサーバアドレス情報の取得を行ったが、同様の機能を奏するものであれば、どのようなものであってもよい。
（２）前記実施形態では、ＬＡＮ内のサーバに対するアクセス手順を、クライアントスタブを利用することによって、ＷＡＮ側のクライアントとＬＡＮ内のクライアントで同一となるようにしたが、このようなクライアントスタブを生成できるものとしては、現状では、クライアントスタブが生成可能な言語（Ｃ／Ｃ＋＋，Ｐｅｒｌ，Ｖｉｓｕａｌ Ｂａｓｉｃ，ＣＯＢＯＬなど）で記述されたＣＧＩやＪａｖａ（登録商標） Ｓｅｒｖｌｅｔがある。しかし、同様の機能を奏するものであれば、どのようなものであってもよい。
（３）前記実施形態では、Ｗｅｂサーバ１１０とブローカ２２の間の通信手順が、ＬＡＮシステム３０内のクライアント群２０とブローカ２２の間の通信手順とまったく同様であるとしたが、互換性のある手順も含まれる。互換性があれば、ＬＡＮシステム３０内のサーバ構成に影響を与える恐れがない。
（４）前記実施形態では、販売・購買・経理などの業務を行うＬＡＮシステムの場合を例として説明したが、各種のＬＡＮシステムに対して適用可能である。また、サーバ，データベース，ブローカ，クライアントの数も任意であり、必要に応じて増減してよい。
【００３６】
【発明の効果】
以上説明したように、本発明によれば、次のような効果がある。
（１）ＬＡＮ内のシステムに対し、そのサーバ構成の変更を伴うことなく、ＷＡＮ側から簡便にアクセスすることができる。このため、現存するＬＡＮ内のシステムをそのまま利用することができる。
（２）ＷＡＮ上のクライアントに対して特別なソフトないしプログラムを要求することなく、ＬＡＮ内のサーバにアクセスすることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態の全体構成を示す図である。
【図２】前記実施形態におけるクライアントからの送信データの主要部を示す図である。
【図３】前記実施形態の動作を示すフローチャートである。
【図４】３階層のＣ／Ｓシステムの一例を示す図である。
【図５】プライベートなＬＡＮシステムの一例を示す図である。
【符号の説明】
１０・・・データベース群
１０Ａ〜１０Ｃ・・・データベース
１２・・・データベースサーバ群
１２Ａ〜１２Ｃ・・・データベースサーバ
１２Ｐ，１４Ｐ・・・ブローカアドレス情報
１４・・・ファンクショナルサーバ群
１４Ａ〜１４Ｃ・・・ファンクショナルサーバ
１６・・・サーバ群
１８・・・社内ＬＡＮ
２０・・・クライアント群
２０Ａ〜２０Ｅ・・・クライアント
２０Ｐ・・・ブローカアドレス情報
２２・・・ブローカ
２２Ａ・・・サーバアドレス情報一覧
３０・・・ＬＡＮシステム
１００・・・携帯電話
１０２・・・ＰＤＡ
１０４・・・ノートＰＣ
１０６・・・クライアント
１０８・・・インターネット
１０９・・・ＨＴＭＬデータ
１１０・・・Ｗｅｂサーバ
１１１・・・ＣＧＩ又はＪａｖａ（登録商標） Ｓｅｒｖｌｅｔ
１１１Ａ・・・サーバ関数呼び出しルーチン
１１１Ｂ・・・データ表示ルーチン
１１２・・・クライアントスタブ
１１３・・・環境ファイル
９００・・・クライアント
９０２・・・ファンクショナルサーバ
９０４・・・データベースサーバ
９０６・・・データベース[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method, a program, a server, and a system for network access. For example, a client connected to a WAN (Wide Area Network) accesses a group of servers arranged on a LAN (Local Area Network). For technology.
[0002]
[Background Art]
C / S (client / server) systems have been put to practical use in a variety of fields. In particular, in a two-layer C / S system in a large-scale core business for a company or the like, the load of a client or a network is high. It is not always satisfactory, such as becoming a bottleneck in processing performance, not necessarily having good expandability, and having poor maintainability of application programs. To remedy such inconvenience, a three-layer C / S system has been developed.
[0003]
FIG. 4 shows a basic configuration of a three-tier C / S system, in which two servers 902 and 904 exist between a client 900 and a database 906. Among these, the functional server 902 integrates various processing logic functions. The database server 904 performs processing related to input / output of data to / from the database 906.
[0004]
Incidentally, the C / S system is usually executed in a distributed environment, and a large number of systems including the client, server, and database shown in FIG. 4 may be operated. For example, there is a case where a company has a plurality of departments and a C / S system is operated for each department. In such a case, when calling (executing) a procedure (an instruction in a series of processing units) on any server from the client side, it is necessary to know the address information of the corresponding server. However, when such server address information is described in a program on the client side, it is necessary to rewrite the address information every time the address of the server is changed due to the addition of a server or the like, which is extremely inefficient and However, the scalability of the system is also reduced. If a desired server can be accessed without describing the server address information in the client program, the server can be freely added, upgraded, or relocated without making any change in the client program. .
[0005]
There is a so-called naming service that realizes such a mechanism. This naming service can be realized by the broker shown in FIG. In the figure, a database group 10 of a LAN system 30 is connected to a database server group 12, and the database server group 12 is connected to a functional server group 14. The database group 10 includes a plurality of databases 10A to 10C..., The database server group 12 includes a plurality of database servers 12A, 12B,. A plurality of functional servers 14A, 14B,... Are included. For example, the functional server 14A is for sales management, the functional server 14B is for accounting / closing, the functional server 14C is for production management, and so on.
[0006]
These servers 16 are connected to a client (PC) group 20 via an in-house LAN 18. The client group 20 includes clients 20A, 20B,... For example, the client 20A is for sales / account management, the client 20B is for purchase / account management, the client 20C is for accounting, and so on. The server groups 12 and 14 are connected to a broker 22 that performs a naming service. The broker 22 itself is a program. For example, in the case of a single broker, the broker 22 is configured to be executed by a server at the center of the system.
[0007]
When starting up the system, first, the broker 22 starts up. At this time, the broker 22 reads its own environment file. This environment file describes the host name and port number of the platform on which it runs. Next, the database server group 12 and the functional server group 14 start up, respectively. At this time, the environment files are similarly read. In the environment file, the host names and port numbers of the brokers 22 that have already been started are written as broker address information 12P and 14P. Each server starts communication with the broker 22 using the broker address (host name and port number) described in the read environment file, and notifies its own host name and port number to the broker 22. Such an operation is sequentially performed between the broker 22 and each server, so that a server address information list 22A is generated in the broker 22.
[0008]
On the other hand, the client group 20 also reads the environment file at the time of startup. In this environment file, address information 20P of the broker 22 and the like are written, and these are held in the client group 20, respectively.
[0009]
In the state after startup as described above, for example, accounting processing is performed by the client 20C, and a program for accounting processing is executed. First, the client 20C accesses the broker 22 with reference to the held broker address information. Then, an inquiry is made for the address information of the server to be accessed. As described above, since the broker 22 holds the server address information list 22A, the broker 22 refers to the server address information list 22A and transmits the corresponding server address information to the client 20C. Next, the client 20C accesses a desired server based on the address information received from the broker 22. For example, it accesses the functional server 14B and calls a server function related to accounting processing (that is, executes an instruction related to accounting processing). That is,
(1) First, the broker 22 is queried for address information of a desired server and acquires address information.
(2) Next, using the acquired address information, access the corresponding server.
In this procedure, the client accesses the server.
[0010]
As described above, the client can use the naming service of the broker 22 to access a server corresponding to a desired processing content without holding any server address information. It is inefficient to inquire the broker for the server address every time the server is called, and the load on the in-house LAN 18 increases. Therefore, the server address information acquired at the first access is held on the client side. To The above three-layer C / S system is described in detail in Non-Patent Documents 1 to 3 below.
[Non-patent document 1]
Nikkei Open System, February 1998, pp. 270-279, "Three-tier C / S system construction technique (1)"
[Non-patent document 2]
Nikkei Open System, March 1998, pp. 264-275, "Three-tier C / S system construction technique (2)"
[Non-Patent Document 3]
Nikkei Open System, April 1998, P268-279, "Three-tier C / S system construction technique (3rd)"
[0011]
[Problems to be solved by the invention]
By the way, the three-tier C / S system as described above will often be constructed as an in-house system of a company, but on the other hand, with the recent spread of mobile information devices such as PDF, notebook personal computers, and mobile phones, There is a growing demand to access internal systems from outside the company using the Internet. However, the conventional C / S system is basically a local and private network system, and does not consider connection to the Internet at all.
[0012]
The present invention focuses on the above points, and a first object is to easily access a system in a LAN from a WAN (wide area network) without changing the server configuration. . A second object is to enable access from the WAN side by using the existing system in the LAN as it is. A third object is to realize access to a system in a LAN without requiring special software or a program for a client on a WAN.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method in which a client in a LAN accesses a server in a LAN by a client in the LAN through a naming service of a broker. Communication with the server on the WAN side is performed according to a procedure determined in the WAN, and communication between the server on the WAN side and the broker is performed between a client in the LAN and the broker. It is characterized by performing the same procedure as described above.
[0014]
The above and other objects, features, and advantages of the present invention will be apparent from the following detailed description and the accompanying drawings.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
<Configuration of the Embodiment> An embodiment of the present invention will be described in detail below. FIG. 1 shows a basic configuration of an embodiment of the present invention. Note that the same reference numerals are used for components similar to those in the above-described background art. In FIG. 1, a client 106 such as a mobile phone 100, a PDA 102, and a notebook PC (personal computer) 104 forms a network with a Web server 110 via the Internet 108. Further, the Web server 110 is connected to the LAN system 30 described above. It should be noted that exchanges and providers are omitted.
[0016]
The client 106 can communicate with the Web server 110 using HTTP (HyperText Transfer Protocol) or HTTPS (HyperText Transfer Protocol over SSL). As the client 106, a mobile phone 100, a PDA 102, and a notebook PC 104 are typical. However, any client that can communicate with the Web server 110 by HTTP or HTTPS via the Internet 108 is applicable. The mobile phone 100 supports C-HTML, I-mode, Java (registered trademark), Macromedia Flash MX, and the like. The PDA 102 and the notebook PC 104 support HTML (+ Java (registered trademark) Script or VB Script), Java. (Registered trademark) Applet.
[0017]
On the other hand, the Web server 110 includes a WWW server, a mail server, a DNS server, a firewall server, and the like as necessary. The Web server 110 has HTML data 109 to be displayed on the client 106. When there is an access request from the client 106 to the LAN system 30 (when a URL to that effect is transmitted), the HTML data 109 is transmitted to the client 106 so that a data input page is displayed. Has become. Further, in the present embodiment, the Web server 110 includes a CGI (Common Gateway Interface) or Java (registered trademark) Servlet (hereinafter, referred to as “CGI”) 111 because it is necessary to call a client stub described later. Details will be described later.
[0018]
Next, each of the clients 106 is provided with a Web browser, whereby a page based on the HTML data 109 for accessing the LAN system 30 is displayed, and data can be input on the homepage. . As a result of this data input, the data transmitted to the Web server 110 is, for example, as shown in FIG. 2, the value of the first parameter name is the name of the server function call routine that is locally called from the CGI 111, and the value of the second parameter name is The form of the HTML data 109 is configured to be the name of the display routine called locally. The first and second parameters are added to the parameters for displaying a general Web page. Then, these parameters are transmitted from the client 106 to the Web server 110 as a hidden field of HTML (HIDDEN FIELD). Therefore, the client 106 only needs to perform the same operation as a normal Web browser.
[0019]
As described above, the client 106 does not directly call a server function for performing a desired process, but only specifies a routine name for calling a server function. An actual remote function call (call of a server included in the database server group 12 or the functional server group 14) is performed in a server function call routine. A remote function call from a server function calling routine may range from a single remote function call to a plurality of different remote function calls.
[0020]
On the other hand, on the Web server 110 side, each function of a server function call routine 111A and a data display routine 111B is provided in the CGI 111, and further, a client stub 112 and an environment file 113 are provided. Among them, the CGI 111 and the client stub 112 are programs for mediating a request from the client 106 and a corresponding server call in the LAN system 30. The CGI 111 acquires the address information of the corresponding server, and the client stub 112 has a function of accessing the corresponding server using the acquired address information. As a result, the Web server 110 can access the broker 22 as if it were a group of clients 20 inside the LAN system 30, and further can access the corresponding server in the LAN system 30. The Web server 110 may be provided with another CGI or the like as needed (not shown).
[0021]
For example, in the case of Nextra (next-generation information exchange network, refer to the non-patent document), the client stub 112 is an IDL (Interface Definition Language) file (when the function called from the CGI 111 is the functional server group 14) or SQL. It is generated by compiling an (Structured Query Language) file (when the function called from the CGI 111 is the database server group 12) by the IDL compiler. Nextra provides a stub generation tool. Specifically, “SQLmake” is prepared for the database server group 12 and “Rpmake” is prepared for the functional server group 14. It is assumed that the IDL file or the SQL file contains all functions called from the CGI 111.
[0022]
The CGI 111 includes functions of a server function calling routine 111A and a data display routine 111B. The Web server 110 has an environment file 113 in its execution directory. In the environment file 113, address information of the broker 22 is described. After the program of the CGI 111 is compiled and converted into an execution module, it is placed in the execution directory of the CGI 111.
[0023]
<Operation of Embodiment> Next, the operation of this embodiment will be described with reference to the flowchart of FIG. The client 106 starts a Web browser and specifies a URL of a site for accessing the LAN system 30. Then, the HTML data 109 is transmitted from the Web server 110 to the client 106 via the Internet 108, and an input screen is displayed on the client 106 (step S10).
[0024]
Then, the user inputs desired data while referring to the screen (step S12). The input data includes an ID and a password for access authentication. Note that necessary items may be selected by a pull-down menu or the like. The input data is transmitted to the Web server 110 via the Internet 108 by a post method (POST Method) or a get method (GET Method) in an HTML form so that the data can be delivered to the CGI 111.
[0025]
The Web server 110 recognizes and starts the CGI or Servlet to be executed from the ACTION attribute of the HTML FORM tag. In the case of the present embodiment, the CGI 111 is activated (Step S14). The activated CGI 111 performs an initialization process. This process includes a process of reading the address information (host name or IP address and port number) of the broker 22 written in the environment file 113 (step S16). Here, an example of the program code of the CGI 111 corresponding to step S16 is as follows.

The part of “if (! Dce_setenv (“ vfm.env ”, NULL, NULL))” indicates a read statement of the environment file 113 information. By reading the broker address information, the CGI 111 can communicate with the broker 22, and as a result, can communicate with the server groups 12 and 14 (server function call). The CGI 111 analyzes the data transmitted from the client 106 and sets the same in the common variable array (step S18). An example of the program code of the CGI 111 corresponding to step S18 is as follows.

[0026]
Next, the CGI 111 dispatches (assigns) the server function. As shown in FIG. 2, the value of the first parameter name of the data received from the client 106 is “server function calling routine name”, and the value of the second parameter name is “display routine name”. In the server function dispatch, the server function calling routine name to be called is determined from the first parameter value, and the calling is further performed (step S20).
[0027]
Then, the called server function calling routine 111A is executed, and a server function call is performed. At this time, it is determined whether the server function call is the first call (step S22). As a result, if it is the first time (Yes in step S22), the broker 22 is accessed using the address information read from the environment file 113 (step S24). The broker 22 acquires the address information of the server to be called from the server address information list 22A and outputs it to the Web server 110 (Step S26). The Web server 110 executes the environment file reading function of the CGI 111, and stores and retains the acquired server address information in the memory (Step S28).
[0028]
In other words, the CGI 111 recognizes only the server function name to be called and inquires the broker 22. The broker 22 returns the address information of the server to the CGI 111 if the server having the inquired function name is a server in the database server group 12, and returns the address of the server if the server is in the functional server group 14. The information is returned to the CGI 111 in the same manner. For example, when the client 106 makes an inquiry regarding sales management, data of the server function name of the functional server 14A is sent from the client 106 to the Web server 110. The CGI 111 analyzes the data transmitted from the client 106, executes a server function calling routine 111A, and performs a server function call of the functional server 14A. Then, the address information of the functional server 14A is sent from the broker 22 to the CGI 111 of the Web server 110.
[0029]
Thereafter, the CGI 111 sets a function parameter included in the data received from the client 106 as an argument of the server function to be called (step S30), and issues a server function call in the server function calling routine 111A (step S32). An example of the program code of the CGI 111 corresponding to steps S30 and S32 is as follows.

By issuing this function call, the client stub 112 is called and executed by the CGI 111, and access to a corresponding server in the LAN system 30 is performed. That is, the server performs processing on the input data of the client 106. An example of the program code of the client stub 112 is as follows.

In the second and subsequent server function calls to the same server, a server function call is issued directly without using the broker 22 using the server address information recorded in step S28 (No in step S22).
[0030]
As described above, when there is a request from the client 106,
(1) The broker 22 is inquired about address information of a desired server in the LAN system 30 and acquires address information.
(2) Next, the corresponding server in the LAN system 30 is accessed using the acquired address information.
Is performed by the CGI 111 and the client stub 112 of the Web server 110. That is, the Web server 110 accesses the server groups 12 and 14 in the LAN system 30 in exactly the same procedure as the client group 20 in the LAN system 30.
[0031]
Next, the result processing of the server function call will be described. In this case, the processing in the CGI 111 is divided depending on whether it is a data reference call or a data registration / update / delete call. First, in the case of the data reference call, after the server function call is completed, the server function call routine 111A uses the value returned as the argument of the server call function to correspond to the second parameter value of the data received from the client 106. The data display routine 111B is called. The called data display routine 111B performs editing processing for display using the passed value (step S34), and then transmits the edited data to the client 106 via the Web server 110 and the Internet 108 (step S36). ). An example of the program code corresponding to steps S34 and S36 is as follows.

The Web browser of the client 106 displays the received edited data on the screen (Step S38).
[0032]
On the other hand, in the case of the data registration / update / delete call, after the server function call is completed, the server function call routine 111A determines the success or failure of the data registration / update / deletion process based on the return value of the server call function (step). S40). Then, the data display routine 111B corresponding to the determination result is called. The called data display routine 111B transmits display data to the client 106 via the Web server 110 and the Internet 108 (Step S42). The Web browser of the client 106 displays the received display data on the screen (Step S38).
[0033]
<Effects of Embodiment> As described above, according to the present embodiment, the following effects are obtained.
(1) From the viewpoint of the client 106 on the Internet 108 side, the server of the LAN system 30 can be accessed only by performing a predetermined input process on the access Web screen, and a desired processing result can be displayed on the screen. it can. The communication procedure between the client 106 and the Web server 110 is different from the general communication procedure on the Web only in the first and second parameters shown in FIG. However, this part is included in advance in the Web screen information when the client 106 accesses the LAN system 30, and is hidden on the display screen of the client 106. Therefore, from the viewpoint of the user of the client 106, it is completely the same as the conventional treatment on the homepage, and does not require any special program or the like on the client 106 side. Can be easily accessed.
[0034]
(2) The communication procedure between the Web server 110 and the broker 22 is exactly the same as the communication procedure between the client group 20 and the broker 22 in the LAN system 30. For this reason, it is possible to access from the client 106 on the Internet 108 without making any change to the server configuration in the LAN system 30, and it is possible to freely add, upgrade, and change the server as in the conventional case. it can.
[0035]
<Other Embodiments> There are many embodiments of the present invention, and various modifications can be made based on the above disclosure. For example, the following are also included.
(1) In the above-described embodiment, the server address information for the broker 22 is obtained using the CGI and (registered trademark) Servlet. However, any server having the same function may be used. Is also good.
(2) In the above embodiment, the access procedure to the server in the LAN is the same for the client on the WAN side and the client in the LAN by using the client stub. However, such a client stub is generated. At present, there are CGI and Java (registered trademark) Servlet written in a language (C / C ++, Perl, Visual Basic, COBOL, etc.) that can generate a client stub. However, any other device having the same function may be used.
(3) In the above embodiment, the communication procedure between the Web server 110 and the broker 22 is exactly the same as the communication procedure between the client group 20 and the broker 22 in the LAN system 30. Procedures are also included. If there is compatibility, there is no possibility of affecting the server configuration in the LAN system 30.
(4) In the above-described embodiment, the case of a LAN system that performs operations such as sales, purchase, and accounting has been described as an example, but the present invention is applicable to various LAN systems. The number of servers, databases, brokers, and clients is also arbitrary, and may be increased or decreased as needed.
[0036]
【The invention's effect】
As described above, the present invention has the following effects.
(1) The system in the LAN can be easily accessed from the WAN without changing the server configuration. Therefore, the existing system in the LAN can be used as it is.
(2) It is possible to access a server in a LAN without requiring a special software or program for a client on a WAN.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of an embodiment of the present invention.
FIG. 2 is a diagram showing a main part of transmission data from a client in the embodiment.
FIG. 3 is a flowchart showing the operation of the embodiment.
FIG. 4 is a diagram illustrating an example of a three-level C / S system.
FIG. 5 is a diagram illustrating an example of a private LAN system.
[Explanation of symbols]
10 ... Database group
10A ~ 10C ・ ・ ・ Database
12 ... Database server group
12A to 12C ... database server
12P, 14P ... Broker address information
14 ... Functional server group
14A-14C: Functional server
16 Server group
18 ・ ・ ・ In-house LAN
20 Client group
20A-20E ・ ・ ・ Client
20P ... Broker address information
22 ... Broker
22A: Server address information list
30 ... LAN system
100 ... mobile phone
102 ・ ・ ・ PDA
104 ・ ・ ・ Notebook PC
106 ・ ・ ・ Client
108 Internet
109 ... HTML data
110 ... Web server
111: CGI or Java (registered trademark) Servlet
111A: Server function calling routine
111B Data display routine
112 ・ ・ ・ Client stub
113 ・ ・ ・ Environment file
900 Client
902: Functional server
904: database server
906 ... Database

Claims (8)

A network access method for allowing a client on a WAN side to access a server in a LAN accessed by a client in the LAN by a naming service of a broker through a server on the WAN side,
Inputting data by the client on the WAN side,
Transmitting the data input in step 1 to the server on the WAN side in a procedure determined on the WAN side;
The server on the WAN side that has received the data in step 2 accesses the broker in the same procedure as the procedure determined between the client in the LAN and the broker, and the naming service function of the broker causes the server to access the broker. Step 3 of acquiring address information of a corresponding server in the LAN
Based on the address information obtained in step 3, the server on the WAN side accesses a server in the corresponding LAN, step 4,
Transmitting and displaying the processing result by the server in the LAN accessed in step 4 to the corresponding client on the WAN side;
A network access method, comprising: Step 3 is executed by CGI or Java (registered trademark) Servlet provided in the server on the WAN side,
2. The network access method according to claim 1, wherein the step 4 is performed by calling a client stub by the CGI or Java (registered trademark) Servlet. If the step 3 is the first acquisition of the address information for the server in the applicable LAN, the acquired address information is stored. 3. The network access method according to claim 1, wherein A LAN system including a broker for performing a naming service when a client in the LAN accesses a server in the LAN,
A client on the WAN side accessing a server in the LAN through the WAN;
A server on the WAN side that mediates communication between the client on the WAN side and the LAN;
With
Communication between the WAN-side client and the WAN-side server is performed according to a procedure determined in the WAN, and communication between the WAN-side server and the broker is performed between a client in the LAN and the broker. A network access system, wherein an intermediary means for performing the same procedure as a procedure determined between the servers is provided in the WAN-side server. The mediation means,
It is provided in the server on the WAN side, accesses the broker in the same procedure as the procedure determined between the client in the LAN and the broker, and uses the naming service function of the broker to connect to the broker in the LAN. Server address information obtaining means for obtaining the address information of the corresponding server,
Server access means for allowing the server on the WAN side to access a server in the LAN based on the address information acquired by the server address information acquisition means;
5. The network access system according to claim 4, comprising: The server address information acquisition means is constituted by CGI or Java (registered trademark) Servlet, and the server access means is constituted by a client stub called by the CGI or Java (registered trademark) Servlet. The network access system according to claim 5. A program for allowing a client on the WAN side to access a server in the LAN accessed by a client in the LAN by the naming service of the broker through the server on the WAN side,
A server on the WAN side that has received the data input by the client on the WAN side accesses the broker in the same procedure as that determined between the client in the LAN and the broker, and names the broker. A server address information acquisition function for acquiring address information of a corresponding server in the LAN by a service function;
A server access function for allowing the server on the WAN side to access a server in the LAN based on the address information acquired by the server address information acquisition function;
A network access program comprising: A network access server provided on the WAN side for mediating between a server in the LAN accessed by a client in the LAN by a broker naming service and a client on the WAN side,
A server on the WAN side that has received the data input by the client on the WAN side accesses the broker in the same procedure as that determined between the client in the LAN and the broker, and names the broker. Server address information acquisition means for acquiring address information of a corresponding server in the LAN by a service function;
Server access means for allowing the server on the WAN side to access a server in a corresponding LAN based on the address information acquired by the server address information acquisition function;
A network access server comprising:

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