JP3276874B2 - Network system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying a host terminal screen output from a host computer on a client terminal.
The present invention relates to an improvement of a network system which is displayed on a computer screen.

[0002]

2. Description of the Related Art A gateway is connected to a host computer, a LAN is connected to the gateway, a plurality of personal computers are connected to the LAN, a LAN is connected to the Internet via a router, and a personal computer is connected to the Internet. Network systems are known.

In this type of network system, it is also known to provide a Web browser (WWW browser) for each personal computer and a Web server for a gateway. A web browser on a personal computer is used to display a homepage of a gateway web server on a personal computer screen.

[0004] Further, using a Web browser, a Java program possessed by the Web server is downloaded to the personal computer, and the Java program downloaded by the personal computer is downloaded.
Executing programs has also been performed. When the host terminal emulator program written in the Java language is downloaded to the personal computer, the host terminal screen output from the host computer can be displayed on the personal computer screen. Java is a trademark of Sun Microsystems, USA.

[0005]

In a conventional client system using a Web browser on the Internet, a method of handling characters dependent on a client by an HTML language, or a unicode by a Java language.
There was no way to display Japanese only with the method of handling characters in the normally used range by de. In addition, in order to input or display user-defined characters or extended kanji in a Japanese FEP (Front End Processor) distributed on the client side, it is necessary to import / export a defined character resource for each client, which requires additional man-hours. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and when displaying a host terminal screen on a Web browser on the Internet, it is possible to handle characters that cannot be processed on the Web browser, The purpose is to reduce the load on the client side by centrally managing fonts on the server side.

[0007]

According to the present invention, a network is provided.
The system comprises a network comprising a host computer, a server computer connected to the host computer via a line, and a client computer connected to the server computer via a line.
In the system, the host computer has means for transmitting screen data to the client computer, the server computer has a communication control unit for controlling communication between the host computer and the server computer, A web server that downloads a communication program and a display program to the client computer in accordance with instructions from a web browser of the client computer, and a client computer that transmits screen data sent from the host computer via a line and a communication control unit. Relay processing means for sending to the communication processing means, and font processing means for sending the font specified by the font request from the display processing means of the client computer to the request source. And has a The, after the communication program and the display program is downloaded,
The communication processing means further includes a communication processing means for executing the communication program and a display processing means for executing the display program. The communication processing means passes display data obtained from screen data from the relay processing means to the display processing means, and displays the display data. The processing unit requests the font processing unit for a font for download at the time of activation from the font processing unit. If the font of the character specified by the display data passed from the communication processing unit is not already downloaded, the font processing unit transmits one. Make font requests on a character-by-character basis.

[0008] The display processing means may be arranged such that when a font for start-up download including a font of a plurality of characters is downloaded from the font processing means,
Creates a character dot pattern for each character, creates character management data indicating the character code and character dot pattern storage location for each created character dot pattern, and downloads the requested one-character font from the font processing means. the when, stores font of the character in the cache, to create a character management data indicating a character code and a cache location corresponding to the font of the character.

[0009]

FIG. 1 is a diagram showing a configuration example of a system to which the present invention is applied. In the figure, 1 is a host computer, 2 is a terminal, 3 is a gateway, 4 is J
ava program, 5 is font memory, 6 to 1
Reference numeral 0 denotes a terminal (PC, UNIX machine, or the like) on which a Web browser capable of handling Java operates.

A terminal 2 is connected to the host computer 1 via a signal line. Host computer 1
The screen displayed on the terminal 2 based on the screen data from is referred to as a host terminal screen. The host computer 1 and the gateway 3 are connected by a line. Although not shown, the gateway 3 has a program called a Web server. In addition, the gateway 3 uses Java.
It has a program 4 and a font memory 5. A LAN is connected to the gateway 3, and a plurality of terminals 6 to 9 are connected to the LAN. The LAN is connected to the Internet via a router, and a terminal 10 is connected to the Internet. Each terminal is Web
It has a program called a browser.

FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. In the figure, 11 is a communication control unit, 12 is a Web server, 13 is a communication daemon, 14 is a font daemon, 15 is a font memory, 16 is a Web browser,
Reference numeral 17 denotes a communication package, 18 denotes a display package, and 19 denotes a font memory. In the illustrated example, it is assumed that the host terminal screen is transmitted to the client 6.

The host computer 1 uses, for example, what is called a JEF code as a character code. The gateway 3 includes a communication control unit 11, a web server 12,
It has a communication daemon 13, a font daemon 14, a font memory 15, and the like. The daemon is
A program or process that runs on a server computer (or gateway).

The communication control unit 11 controls communication between the gateway 2 and the host computer 1.
The Web server 12 has various functions in addition to the http daemon supporting the Internet standard protocol. The communication daemon 13 communicates with the communication package 17 of the client 6. font·
The daemon 14 displays the display package 18 of the client 6.
Receives a font request from the font memory 15 and reads the corresponding font from the font memory 15 and sends the read font to the display package 18. The font memory 15 stores JIS first-level kanji, basic non-kanji, JIS
It has fonts for second-level kanji and extended kanji. JI
S-level 2 kanji and extended kanji fonts are optional. The extended kanji is a character added to JIS kanji from the past results.

The client 6 has a Web browser 16. Web browser 16 is communication package 17
When a request to download the display package 18 to the Web server 12 is made, the communication package 17 and the display package 18 are downloaded to the client 6. The downloaded communication package 17 and display package 18 are immediately activated. Display package 18
At the time of startup, the display package 18 requests the font daemon 14 for a font to be downloaded at startup. Fonts for download at startup are JIS No. 1
Standard kanji and basic non-kanji fonts. The font daemon 14 reads the requested font from the font memory 15 and sends the read font to the display package 18. The display package 18 stores the received font in the font memory 19. The package means a set of applets (programs) written in the Java language.

The operation of the apparatus shown in FIG. 2 will be described. ,
,... Indicate the order of processing. Character fonts are divided into two types in advance, one for download at startup and one for download when necessary, and a font daemon and a communication daemon are activated. The download for startup is JIS first-level kanji and basic non-kanji, and the download for when necessary is JIS second-level kanji and extended kanji. Font Demon knows that the fonts for start-up download are JIS first-level kanji and basic non-kanji fonts. The communication package and the display package are downloaded based on a request from the Web browser of the client. Download the font for download at startup. Upon receiving the screen data from the host, the communication package passes the display data to the display package. The screen data is a data stream for screen control from the host, and includes a character code and a control code. The display data is obtained by rearranging the screen data, and includes a character code and an attribute of the character (final state after control).

If the font for displaying the character specified by the display data is a font already downloaded to the client, the font data is developed on the screen. If not, the client's display package requests the font from the font daemon on a character-by-character basis. Font data is extracted from the font options and passed to the font daemon. The font daemon passes the font data to the client's display package, which uses the font data to display characters on the screen and stores the font data in font memory.

FIG. 3 is a diagram for explaining a method of displaying dot data according to the present invention. Note that the campus means a storage area for drawing in Java language. In order to improve the character display performance, a normally used character font (a font for starting download) is downloaded in advance from the font daemon 14 to the client 6 as a dot image. There are thousands of commonly used characters, and these thousands of character fonts are downloaded to the client at once as a bit string. At this time, the character string, information indicating the range of the bit string in which the character font corresponding to each character code is located, and character configuration information (indicating how many dots are vertical and how many dots are horizontal) are stored in the bit string. Followed by When the host computer uses the JEF code, the character code becomes the JEF code. The dot data is developed in advance as data to be displayed on the campus. To expand, a bit string containing thousands of character fonts is decomposed into characters, character dot patterns are created in character units in advance, and character codes and characters corresponding to each created character dot pattern are created. This means that character management data indicating the dot pattern storage position is created. These character dot patterns and character management data are stored in an appropriate storage area. These processes are performed by the display package.

Expansion data (character dot created
Pattern) on the campus immediately upon display request. Fonts of characters that are not normally used (fonts for downloading when necessary) are downloaded when a font request is issued and attached to the display campus. The font data downloaded in step 1 is stored in the display package cache. Thereafter, if there is a similar character request again, the character is retrieved from the cache and expanded. The number of caches is determined in advance, and one cache stores one font data. Also, it goes without saying that character management data indicating the character code corresponding to the font data stored in the cache and the position of the cache is created.

FIG. 4 is a diagram showing an example of the processing flow of the communication daemon. In an initial state, it is in a state of waiting for communication from the host computer / communication package. When data is sent from the communication package, the data is received,
Relay the received data to the host computer. When data is sent from the host computer, the data is received and the received data is transmitted to the communication package.

FIG. 5 is a diagram showing an example of the processing flow of the font daemon. In an initial state, it is in a state of waiting for communication from the display package. Font from display package
When a data request is received, the request is received and the font data of the character specified in the request is
The read font data is transferred from the memory to the display package. That is, when a font for download at startup is requested, the font demon sends all fonts belonging to JIS first-level kanji and basic non-kanji to the display package, and a font of one character is requested. In this case, the font of the character is sent to the display package.

FIG. 6 is a diagram showing an example of a processing flow of the communication package. In the initial state, it is in a state of waiting for input from the display package / communication from the communication daemon. When input data is sent from the display package, the input data is received, and the received data is transferred to the communication daemon. When screen data is sent from the communication daemon,
The data is received, and the display data is transmitted to the display package.

FIG. 7 is a diagram showing an example of a display package processing flow. The display package requests a font for download at start-up from the font demon at the time of start-up, waits for request data to be sent, and if so, expands the received font data. Next, KB
Waiting for input from (keyboard) / waiting for data from communication package. When data is sent from the KB, the display data is received. When display data is sent from the communication package, the display data is received. Then, it is checked whether the font of the character indicated by the received data has already been downloaded. YES
If, draw that character. In the case of NO, the font daemon is requested for the font of the character, and waits for the font data to be sent. If so, the character is drawn and stored in the cache.

[0023]

As is apparent from the above description, according to the present invention, the following effects can be obtained. (a) Since the resources are centrally managed by the application server, the load of importing / exporting character resources can be reduced. (b) User-defined characters and extended kanji can be handled on a Web browser, so that migration from a conventional core system can be seamlessly realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a network system to which the present invention is applied.

FIG. 2 is a diagram showing a configuration example of an embodiment of the present invention.

FIG. 3 is a diagram for explaining display of dot data in the present invention.

FIG. 4 is a diagram illustrating an example of a processing flow of a communication daemon.

FIG. 5 is a diagram illustrating an example of a processing flow of a font daemon.

FIG. 6 is a diagram illustrating an example of a processing flow of a communication package.

FIG. 7 is a diagram illustrating an example of a processing flow of a display package.

[Description of Signs] 1 Host computer 2 Terminal 3 Gateway 4 Java program 5 Font memory 6 Terminal 7 Terminal 8 Terminal 9 Terminal 10 Terminal 11 Communication control unit 12 Web server 13 Communication daemon 14 Font daemon 15 Font memory 16 Web Browser 17 Communication package 18 Display package 19 Font memory

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 13/00 G06F 15/00 G06F 17/21 G06T 1/00 G06F 3/12

Claims (1)

(57) [Claims] 1. A network system comprising a host computer, a server computer connected to a host computer via a line, and a client computer connected to the server computer via a line. Wherein the host computer has means for transmitting screen data to the client computer as a destination, the server computer has a communication control unit for controlling communication between the host computer and the server computer, and a communication control unit for the client computer. A web server that downloads a communication program and a display program to a client computer in accordance with instructions from a web browser, and a client computer that transmits screen data sent from a host computer via a line and a communication control unit.
Relay processing means for sending to the communication processing means of the computer, and font processing means for sending the font specified by the font request from the display processing means of the client computer to the request source; the client computer has a web browser Also, after the communication program and the display program are downloaded, the communication program further includes communication processing means for executing the communication program and display processing means for executing the display program. The communication processing means includes a screen from the relay processing means. The display data obtained from the data is passed to the display processing means, and the display processing means requests the font processing means for the font to be downloaded at the time of startup at the time of startup, and displays a plurality of character fonts.
Font for startup download including fonts
When downloaded from the
Create a character dot pattern in units and create the character
Character code and character dot pattern for each dot pattern
If the font of the character specified by the display data passed from the communication processing unit has not been downloaded, a font request is made to the font processing unit on a character-by-character basis. Required
The font of one character requested is down from the font processing means.
Kiniwa to have been loaded, the font of the character cache
Character code corresponding to the font of the character
And network system comprising a call <br/> to create a character management data indicating a cache location.