CN110889054A - Online preview method and device for front-end and back-end separation Web system - Google Patents
Online preview method and device for front-end and back-end separation Web system Download PDFInfo
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- CN110889054A CN110889054A CN201911157599.9A CN201911157599A CN110889054A CN 110889054 A CN110889054 A CN 110889054A CN 201911157599 A CN201911157599 A CN 201911157599A CN 110889054 A CN110889054 A CN 110889054A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/955—Retrieval from the web using information identifiers, e.g. uniform resource locators [URL]
- G06F16/9566—URL specific, e.g. using aliases, detecting broken or misspelled links
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/958—Organisation or management of web site content, e.g. publishing, maintaining pages or automatic linking
- G06F16/986—Document structures and storage, e.g. HTML extensions
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Abstract
The invention relates to a method and a device for online preview of a front-end and back-end separation Web system, wherein the method comprises the following steps: configuring a reverse proxy at a front end, and initiating a request for an interface to a back end separated from the front end based on the reverse proxy; in response to receiving the request, the back end receives a preview instruction sent by the front end through the interface; the back end extracts data from the database according to the preview instruction to generate a data stream, and feeds the data stream back to the front end through an interface; the front end receives the data stream based on the reverse proxy and converts the data stream into a BLOB object; a URL for the front-end browser is generated for the BLOB object and opened for online preview. The embodiment of the invention overcomes the interception of the browser to the request of the front end and the back end which are separated from each other to the interface of the back end, solves the problem that the on-line preview can not be provided under the scene of separating the front end and the back end in the prior art, enriches the functions of the Web system with the separated front end and the back end, and further facilitates the use of users.
Description
Technical Field
The invention relates to the technical field of communication. The invention further relates to an online preview method and device of the front-end and back-end separation Web system.
Background
With the development of the internet, the Web structure of the network becomes more and more diverse, and the scale of the Web system is also more and more separated. In the current Web system, the development model with separated front and back ends is widely applied. The front-end and back-end separation means that the front end and the back end of the Web system are respectively coded in different development modes and are positioned in different servers or systems, the java-Web is taken as an example, the back end uses java codes, the front end uses html and js codes, different developers develop respectively in respective projects, and the front end and the back end are integrated with each other through interfaces. The advantage of front-end separation includes independent development process and no influence on each other. However, the problems that follow are numerous. For example, in a non-separated system, a dynamically generated page such as an html report can exist in a static directory for direct preview access, so that a user can conveniently determine whether the page is correct or not and whether the page is to be downloaded. When the front end and the back end are separated, the front end and the back end are not usually on the same server, the browser can refuse the request initiated by the front end to the separated back end, and html cannot be used as static resources to directly access. Therefore, in the current scene of separating the front end from the back end, the user can only select to directly download html basically, and the system cannot support the preview function of the html.
Therefore, in view of the above problems in the prior art, a solution is needed to provide online previewing in a front-end and back-end separated Web system, so as to enrich the functions of the front-end and back-end separated Web systems and facilitate the use of users.
Disclosure of Invention
In one aspect, the present invention provides a method for online previewing of a front-end and back-end separated Web system based on the above object, wherein the method comprises the following steps:
configuring a reverse proxy at a front end, and initiating a request for an interface to a back end separated from the front end based on the reverse proxy;
in response to receiving the request, the back end receives a preview instruction sent by the front end through the interface;
the back end extracts data from the database according to the preview instruction to generate a data stream, and feeds the data stream back to the front end through an interface;
the front end receives the data stream based on the reverse proxy and converts the data stream into a BLOB object;
a URL for the front-end browser is generated for the BLOB object and opened for online preview.
According to the embodiment of the method for online previewing of the front-end and back-end separated Web system, the method for online previewing of the front-end and back-end separated Web system includes that the back-end extracts data from the database according to the preview instruction to generate the data stream, and feeds the data stream back to the front-end through the interface, and the method further includes the following steps:
extracting specified data from a database according to the preview instruction;
the FTL template of HTML is called and the data is generated into a data stream of a specified format by FreeMarker.
According to an embodiment of the method for online preview of a front-end and back-end separated Web system in the present invention, the invoking FTL template of HTML and generating data into a data stream of a specified format by FreeMarker further comprises:
a data stream is generated that specifies an HTML format of the format HTML-TEXT type.
An embodiment of the method for on-line preview of a front-end and back-end separation Web system according to the present invention, wherein the front-end receives the data stream based on a reverse proxy and converts the data stream into a BLOB object further comprises:
the front end monitors the status code of the request;
the front end receives the data stream in response to the value of the status code being the specified value.
An embodiment of the method for online preview of a front-end and back-end separated Web system according to the present invention, wherein configuring a reverse proxy at the front-end, and initiating a request for an interface to the back-end separated from the front-end based on the reverse proxy further comprises:
the front end issues nginx, and the request of the front end is loaded to the specified back end in the nginx configuration file.
On the other hand, the invention also provides a device for online previewing of the front-end and back-end separation Web system, wherein the device comprises:
at least one processor; and
a memory storing processor-executable program instructions that, when executed by the processor, perform the steps of:
configuring a reverse proxy at a front end, and initiating a request for an interface to a back end separated from the front end based on the reverse proxy;
in response to receiving the request, the back end receives a preview instruction sent by the front end through the interface;
the back end extracts data from the database according to the preview instruction to generate a data stream, and feeds the data stream back to the front end through an interface;
the front end receives the data stream based on the reverse proxy and converts the data stream into a BLOB object;
a URL for the front-end browser is generated for the BLOB object and opened for online preview.
According to an embodiment of the apparatus for online previewing of a front-end and back-end separated Web system in the present invention, the back-end extracting data from a database according to a preview instruction to generate a data stream, and feeding back the data stream to the front-end through an interface further includes:
extracting specified data from a database according to the preview instruction;
the FTL template of HTML is called and the data is generated into a data stream of a specified format by FreeMarker.
An embodiment of the apparatus for online preview of a front-end and back-end separated Web system according to the present invention, wherein the step of calling FTL template of HTML and generating data into data stream of a specified format by FreeMarker further comprises:
a data stream is generated that specifies an HTML format of the format HTML-TEXT type.
An embodiment of the apparatus for on-line preview of a front-end and back-end separation Web system according to the present invention, wherein the front-end receives the data stream based on a reverse proxy and converts the data stream into a BLOB object further comprises:
the front end monitors the status code of the request;
the front end receives the data stream in response to the value of the status code being the specified value.
An embodiment of the apparatus for online preview of a front-end and back-end separated Web system according to the present invention, wherein the configuring of the reverse proxy at the front-end and the initiating of the request for the interface to the back-end separated from the front-end based on the reverse proxy further comprises:
the front end issues nginx, and the request of the front end is loaded to the specified back end in the nginx configuration file.
By adopting the technical scheme, the invention at least has the following beneficial effects: the access and the request of the front end to the rear end interface which are separated from each other in the front-end and rear-end separated Web system are realized by configuring the reverse proxy at the front end, the interception of the browser to the request of the front end to the rear end interface which is separated from each other is overcome, no entity file is generated in the process of acquiring and feeding back data at the rear end, the data is fed back to the front end in the form of data stream with a specified format, the received data stream is converted into a BLOB object at the front end again, the dynamic online preview in the browser through the URL is realized, the problem that the online preview cannot be provided in the front-end and rear-end separated scene in the prior art is solved, the functions of the front-end and rear-end separated Web system are enriched, and the use of a user is facilitated.
The present invention provides aspects of embodiments, which should not be used to limit the scope of the present invention. Other embodiments are contemplated in accordance with the techniques described herein, as will be apparent to one of ordinary skill in the art upon study of the following figures and detailed description, and are intended to be included within the scope of the present application.
Embodiments of the invention are explained and described in more detail below with reference to the drawings, but they should not be construed as limiting the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the prior art and the embodiments will be briefly described below, parts in the drawings are not necessarily drawn to scale, and related elements may be omitted, or in some cases the scale may have been exaggerated in order to emphasize and clearly show the novel features described herein. In addition, the structural order may be arranged differently, as is known in the art.
FIG. 1 shows a schematic block diagram of an embodiment of a method of online preview of a front-end and back-end separation Web system according to the present invention.
Detailed Description
While the present invention may be embodied in various forms, there is shown in the drawings and will hereinafter be described some exemplary and non-limiting embodiments, with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiments illustrated.
FIG. 1 shows a schematic block diagram of an embodiment of a method of online preview of a front-end and back-end separation Web system according to the present invention. In the embodiment shown in the figure, the method comprises at least the following steps:
s1: configuring a reverse proxy at a front end, and initiating a request for an interface to a back end separated from the front end based on the reverse proxy;
s2: in response to receiving the request, the back end receives a preview instruction sent by the front end through the interface;
s3: the back end extracts data from the database according to the preview instruction to generate a data stream, and feeds the data stream back to the front end through an interface;
s4: the front end receives the data stream based on the reverse proxy and converts the data stream into a BLOB object;
s5: a URL for the front-end browser is generated for the BLOB object and opened for online preview.
In the Web system with separated front and back ends, in order to overcome the interception of the browser to the request of the front end to the back end interface separated from each other, in the embodiment of the present invention, a reverse proxy mechanism is adopted so that the browser can not regard the request initiated by the front end to the back end separated from the front end as an illegal request. Therefore, step S1 first configures the reverse-proxy at the front-end, and initiates a request for an interface to a back-end separate from the front-end by the front-end based on the reverse-proxy, preferably the front-end requests the back-end interface via xmlhttprequest. After the back end receives the request for the interface, that is, after establishing the front end and back end paths, step S2 receives the front end preview command through the interface. The user may indicate at the front end which data to preview online via preview instructions. In some embodiments the preview instructions also include instructions indicating the presentation format, style, etc. on the web page at the time of online preview. After receiving the preview command from the front end, in step S3, the back end extracts the specified data from the database according to the preview command to generate a data stream according to the specified format, and feeds back the data stream to the front end through the interface. The specified format may be a default format set in the backend system in advance, or may be a specified format specified by the user and indicated to the backend through the preview instruction. It should be noted that, in the embodiment of the present invention, in the data processing process performed by the back end, only the data in the database is subjected to conditional screening, extraction, and summarization, and a data stream is generated according to a specified format, during which no entity file is generated. Subsequently, step S4 front end receives the data stream based on the reverse proxy and converts the data stream into a BLOB Object. At this time, the data stream (i.e., BLOB object) to be previewed online is already cached in the memory of the front-end server. Finally, step S5 generates a URL (Uniform Resource Locator) for the BLOB Object that the front-end browser can parse through the DOM (Document Object Model), preferably using the rul. Since the BLOB object is cached in the memory, especially in the browser memory, online preview can be performed very quickly and conveniently, and the user can determine whether to perform further processing such as downloading of the data by means of online preview. Meanwhile, closing the browser will release the BLOB object to prevent it from occupying too much memory space.
Further embodiments of the present invention will be described below, it being noted that the numbering of the steps mentioned therein is used only for the convenience of unambiguously indicating the step without any particular indication, and does not limit the order of the steps described.
In one or more embodiments of the method for online preview of a front-end and back-end separated Web system of the present invention, the step S3 the back-end extracting data from the database according to the preview instruction to generate a data stream, and feeding back the data stream to the front-end through the interface further includes:
s31: extracting specified data from a database according to the preview instruction;
s32: calling FTL template of HTML and generating data into a data stream with a specified format through freemaker.
That is, in these embodiments, first the data needed by the front end is stored in the mysql database, and the user can indicate which data is needed through the preview instructions. After receiving the preview command, the back end executes the two steps, wherein in the first step, S31 extracts the specified data from the database according to the preview command, and performs searching, extracting, summarizing and other processing according to the screening conditions through java query. Its two S32 preferably calls the FTL template of the HTML and generates the data into a data stream of the specified format by FreeMarker. FreeMarker is a template engine written in the Java language that generates text output based on templates. In an embodiment of the present invention, the processed data in S31 is preferably generated into a data stream of a specified format by FreeMarker. At this time, the data stream also carries information such as format and style to be presented in the subsequent online preview process, in addition to the required data.
In some embodiments of the method for separating online previews of a Web system at a front end and a back end of the present invention, the step S32 of invoking FTL template of HTML and generating data into a data stream of a specified format by FreeMarker further comprises: a data stream is generated that specifies an HTML format of the format HTML-TEXT type. That is, the backend preferably generates a data stream of type HTML _ TEXT followed by HTML by java.
In several embodiments of the method for front-end and back-end separation of online previews of a Web system of the present invention, the step S4 front-end receiving a data stream based on a reverse proxy, and converting the data stream into a BLOB object further comprises:
s41: the front end monitors the status code of the request;
s42: the front end receives the data stream in response to the value of the status code being the specified value.
Upon the front-end initiating an xmlhttprequest request for an interface to a back-end separate from the front-end based on the reverse proxy at step S1, the front-end starts monitoring the status code of the xmlhttprequest request S41. Only when the value of the status code is the designated value 200, it indicates that the request is responded and the feedback is successful, so the S42 front end starts receiving the data stream fed back.
In some embodiments of the method for on-line preview of a front-end and back-end separation Web system of the present invention, the step S1 configuring the reverse proxy at the front-end, and initiating a request for an interface to the back-end separated from the front-end based on the reverse proxy further comprises: the front end issues nginx, and the request of the front end is loaded to the specified back end in the nginx configuration file. The reverse proxy may be implemented in various suitable ways. In an embodiment of the present invention, a reverse proxy for online previews of a front-end separated Web system is preferably built based on nginx. The front end issues through nginx, and loads the front end request to a designated back end in a nginx configuration file for processing. Taking the test request of the front end loaded to the specified back end 127.0.0.1:8888 as an example, the following instructions can be added to the nginx configuration file:
on the other hand, the invention also provides a device for online previewing of the front-end and back-end separation Web system, wherein the device comprises: at least one processor; and a memory storing processor-executable program instructions that, when executed by the processor, perform the steps of:
s1: configuring a reverse proxy at a front end, and initiating a request for an interface to a back end separated from the front end based on the reverse proxy;
s2: in response to receiving the request, the back end receives a preview instruction sent by the front end through the interface;
s3: the back end extracts data from the database according to the preview instruction to generate a data stream, and feeds the data stream back to the front end through an interface;
s4: the front end receives the data stream based on the reverse proxy and converts the data stream into a BLOB object;
s5: a URL for the front-end browser is generated for the BLOB object and opened for online preview.
In one or more embodiments of the apparatus for front-end separation of online previews of a Web system according to the present invention, the step S3 the back-end extracting data from the database according to the preview instruction to generate a data stream, and feeding back the data stream to the front-end through the interface further includes:
s31: extracting specified data from a database according to the preview instruction;
s32: the FTL template of HTML is called and the data is generated into a data stream of a specified format by FreeMarker.
In some embodiments of the apparatus for front-end separation of online previews of a Web system of the present invention, the step S32 of calling FTL template of HTML and generating data into a data stream of a specified format by FreeMarker further comprises: a data stream is generated that specifies an HTML format of the format HTML-TEXT type.
In several embodiments of the apparatus for front-end splitting online preview of a Web system of the present invention, the step S4 the front-end receiving a data stream based on a reverse proxy, and converting the data stream into a BLOB object further comprises:
s41: the front end monitors the status code of the request;
s42: the front end receives the data stream in response to the value of the status code being the specified value.
In some embodiments of the apparatus for on-line preview of a front-end and back-end separation Web system of the present invention, the step S1 configuring the reverse proxy at the front-end, and initiating a request for an interface to the back-end separated from the front-end based on the reverse proxy further comprises: the front end issues nginx, and the request of the front end is loaded to the specified back end in the nginx configuration file.
The devices and apparatuses disclosed in the embodiments of the present invention may be various electronic terminal apparatuses, such as a mobile phone, a Personal Digital Assistant (PDA), a tablet computer (PAD), a smart television, and the like, or may be a large terminal apparatus, such as a server, and therefore the scope of protection disclosed in the embodiments of the present invention should not be limited to a specific type of device and apparatus. The client disclosed in the embodiment of the present invention may be applied to any one of the above electronic terminal devices in the form of electronic hardware, computer software, or a combination of both.
The computer-readable storage media (e.g., memory) described herein may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. By way of example, and not limitation, nonvolatile memory can include Read Only Memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which can act as external cache memory. By way of example and not limitation, RAM is available in a variety of forms such as synchronous RAM (DRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The storage devices of the disclosed aspects are intended to comprise, without being limited to, these and other suitable types of memory.
By adopting the technical scheme, the invention at least has the following beneficial effects: the access and the request of the front end to the rear end interface which are separated from each other in the front-end and rear-end separated Web system are realized by configuring the reverse proxy at the front end, the interception of the browser to the request of the front end to the rear end interface which is separated from each other is overcome, no entity file is generated in the process of acquiring and feeding back data at the rear end, the data is fed back to the front end in the form of data stream with a specified format, the received data stream is converted into a BLOB object at the front end again, the dynamic online preview in the browser through the URL is realized, the problem that the online preview cannot be provided in the front-end and rear-end separated scene in the prior art is solved, the functions of the front-end and rear-end separated Web system are enriched, and the use of a user is facilitated.
It is to be understood that the features listed above for the different embodiments may be combined with each other to form further embodiments within the scope of the invention, where technically feasible. Furthermore, the specific examples and embodiments described herein are non-limiting, and various modifications of the structure, steps and sequence set forth above may be made without departing from the scope of the invention.
In this application, the use of the conjunction of the contrary intention is intended to include the conjunction. The use of definite or indefinite articles is not intended to indicate cardinality. In particular, references to "the" object or "an" and "an" object are intended to mean one of many such objects possible. However, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated. Furthermore, the conjunction "or" may be used to convey simultaneous features, rather than mutually exclusive schemes. In other words, the conjunction "or" should be understood to include "and/or". The term "comprising" is inclusive and has the same scope as "comprising".
The above-described embodiments, particularly any "preferred" embodiments, are possible examples of implementations, and are presented merely for a clear understanding of the principles of the invention. Many variations and modifications may be made to the above-described embodiments without departing substantially from the spirit and principles of the technology described herein. All such modifications are intended to be included within the scope of this disclosure.
Claims (10)
1. A method for online previewing of a front-end and back-end separated Web system is characterized by comprising the following steps:
configuring a reverse proxy at a front end, and initiating a request for an interface to a back end separated from the front end based on the reverse proxy;
in response to receiving the request, the back end receives a preview instruction sent by the front end through the interface;
the back end extracts data from a database according to the preview instruction to generate a data stream, and feeds the data stream back to the front end through the interface;
the front-end receives the data stream based on the reverse proxy and converts the data stream to a BLOB object;
generating a URL for the BLOB object for a front-end browser, and opening the URL for online preview.
2. The method of claim 1, wherein the back-end extracts data from a database according to the preview instructions to generate a data stream, and feeds the data stream back to the front-end through the interface further comprises:
extracting specified data from a database according to the preview instruction;
and calling FTL template of HTML and generating the data into a data stream with a specified format through Freemarker.
3. The method of claim 2, wherein the invoking the FTL template of HTML and generating the data into a data stream of a specified format by FreeMarker further comprises:
and generating the data stream in the HTML format with the specified format of HTML _ TEXT type.
4. The method of claim 1, wherein the front-end receives the data stream based on the reverse proxy and converting the data stream into a BLOB object further comprises:
the front end monitors the status code of the request;
the front end receives the data stream in response to the value of the status code being a specified value.
5. The method of claim 1, wherein configuring a reverse proxy at a front end and initiating a request for an interface based on the reverse proxy to a back end separate from the front end further comprises:
and the front end issues nginx, and loads the request of the front end to a specified back end in a nginx configuration file.
6. An apparatus for online previewing of a front-end and back-end detached Web system, the apparatus comprising:
at least one processor; and
a memory storing processor-executable program instructions that, when executed by the processor, perform the steps of:
configuring a reverse proxy at a front end, and initiating a request for an interface to a back end separated from the front end based on the reverse proxy;
in response to receiving the request, the back end receives a preview instruction sent by the front end through the interface;
the back end extracts data from a database according to the preview instruction to generate a data stream, and feeds the data stream back to the front end through the interface;
the front-end receives the data stream based on the reverse proxy and converts the data stream to a BLOB object;
generating a URL for the BLOB object for a front-end browser, and opening the URL for online preview.
7. The apparatus of claim 6, wherein the back-end extracts data from a database according to the preview instructions to generate a data stream, and feeds the data stream back to the front-end through the interface further comprises:
extracting specified data from a database according to the preview instruction;
and calling FTL template of HTML and generating the data into a data stream with a specified format through Freemarker.
8. The apparatus of claim 7, wherein the invoking of the FTL template of HTML and the generating of the data into the data stream of the specified format by FreeMarker further comprises:
and generating the data stream in the HTML format with the specified format of HTML _ TEXT type.
9. The apparatus of claim 6, wherein the front-end receives the data stream based on the reverse proxy and converting the data stream into a BLOB object further comprises:
the front end monitors the status code of the request;
the front end receives the data stream in response to the value of the status code being a specified value.
10. The apparatus of claim 6, wherein the configuring a reverse proxy at a front end and initiating a request for an interface based on the reverse proxy to a back end separate from the front end further comprises:
and the front end issues nginx, and loads the request of the front end to a specified back end in a nginx configuration file.
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| CN201911157599.9A CN110889054A (en) | 2019-11-22 | 2019-11-22 | Online preview method and device for front-end and back-end separation Web system |
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| CN201911157599.9A CN110889054A (en) | 2019-11-22 | 2019-11-22 | Online preview method and device for front-end and back-end separation Web system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113050940A (en) * | 2021-03-24 | 2021-06-29 | 百度在线网络技术（北京）有限公司 | Method for previewing small program, related device and computer program product |
| CN113971027A (en) * | 2021-10-26 | 2022-01-25 | 北京字节跳动网络技术有限公司 | Code conversion method and device, computer equipment and storage medium |
-
2019
- 2019-11-22 CN CN201911157599.9A patent/CN110889054A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113050940A (en) * | 2021-03-24 | 2021-06-29 | 百度在线网络技术（北京）有限公司 | Method for previewing small program, related device and computer program product |
| CN113971027A (en) * | 2021-10-26 | 2022-01-25 | 北京字节跳动网络技术有限公司 | Code conversion method and device, computer equipment and storage medium |
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