Excel file exporting method and system based on Java language

Abstract

The invention discloses an Excel file exporting method and system based on Java language, and relates to the technical field of computer software development, and the implementation of the method comprises the following steps: receiving an exporting request: the system receives the exporting request of a user through a Web interface or a graphical interface; analyzing template configuration: loading and analyzing an Excel export template specified by a user by a system; data binding and style rendering: the system binds a data set obtained from a database, a cache or other data sources with a template, and performs style rendering according to template configuration; an Excel file is generated, specifically, according to the export format selected by the user, the system calls an Apache POI library to create a Workbook object, and rendered data is written into a worksheet; and returning or storing the file. According to the method, the format and the content of the Excel file can be exported in a self-defined mode according to the configuration information of the user, the development efficiency is improved, and the expandability of the system is enhanced.

Description

Technical Field

[0001] This invention relates to the field of computer software development technology, specifically to a method and system for exporting Excel files based on the Java language. Background Technology

[0002] With the development of information technology, data processing and visualization have become important functions of various information systems. Especially in scenarios such as enterprise management, financial reporting, and data analysis, Excel is widely used for data export and sharing due to its excellent compatibility, editability, and visualization features.

[0003] Currently, commonly used Excel manipulation libraries in Java development environments include Apache POI, JExcelAPI, and EasyExcel. While these tools can perform basic read and write operations, they suffer from the following problems when faced with complex business requirements:

[0004] 1. Complex APIs and high learning curve: For example, Apache POI provides a rich set of functional interfaces, but its API design is relatively low-level, requiring developers to write a lot of code to implement style control such as fonts, colors, and merged cells.

[0005] 2. Lack of template-driven mechanism: Existing solutions mostly use hard-coding to define styles and structures, which makes it difficult to meet the diverse needs of different users for export formats.

[0006] 3. Significant performance bottlenecks: When processing large amounts of data for export, traditional methods are prone to causing memory overflow (OOM) problems, affecting system stability.

[0007] 4. Poor format compatibility: Compatibility issues between different Excel versions (such as .xls and .xlsx) increase development difficulty.

[0008] 5. Lack of unified configuration management: Most systems lack a visual template configuration module, making it impossible to quickly respond to business changes.

[0009] Furthermore, traditional Excel export methods typically lack maintainability and scalability. If business logic changes, it often requires modifying the source code and redeploying the entire system. This not only increases maintenance costs but also reduces the system's flexibility and adaptability.

[0010] Therefore, there is an urgent need for an efficient, flexible, and configurable Excel export solution to improve the system's usability, maintainability, and scalability. Summary of the Invention

[0011] The technical objective of this invention is to address the above-mentioned shortcomings by providing a Java-based method and system for exporting Excel files, which can customize the format and content of exported Excel files according to user configuration information, thereby improving development efficiency and enhancing system scalability.

[0012] The technical solution adopted by this invention to solve its technical problem is:

[0013] An Excel file export method based on the Java language, the implementation of which includes the following steps:

[0014] Step 1: Receive export request; The system receives the user's export request through a web interface (such as a RESTful API) or a graphical interface;

[0015] Step 2: Parse template configuration; the system loads and parses the user-specified Excel export template;

[0016] Step 3: Data binding and style rendering; The system binds the dataset obtained from the database, cache or other data sources to the template, and performs style rendering according to the template configuration;

[0017] Step 4: Generate an Excel file; based on the user-selected export format (.xls or .xlsx), the system calls the Apache POI library to create a Workbook object and writes the rendered data into the worksheet;

[0018] Step 5: Return or save the generated Excel file to the user for download, or store it in a target location including a server, cloud storage, FTP, etc.

[0019] This method incorporates various modern software architecture concepts such as template engines, configuration centers, asynchronous task scheduling, and streaming processing to achieve a high degree of encapsulation and flexible control over Excel export functionality, supporting various application scenarios from simple lists to complex reports. It is particularly suitable for the dynamic generation requirements of complex table styles and structures in enterprise applications.

[0020] Furthermore, in step 1, the request parameters include: data source identifier (database table name, SQL statement, object collection, etc.), export template identifier (preset template ID or uploaded Excel template file), export format (.xls or .xlsx), export field range (select specific columns), and pagination information (starting row number, number of rows per page).

[0021] Furthermore, the Excel export template includes the following forms:

[0022] Pre-defined XML configuration file;

[0023] Template records stored in the database;

[0024] User-uploaded Excel files;

[0025] The template content includes the following information:

[0026] Column definition, including column header, field mapping, column width, and alignment;

[0027] Style definitions, including font, color, background color, border, and cell merging rules;

[0028] Dynamic placeholders (such as ${username}) are used to replace actual data later.

[0029] Furthermore, step 3 specifically includes the following process:

[0030] Map field values ​​from the data source to corresponding cells in the Excel spreadsheet;

[0031] The corresponding fields will be styled according to the template (such as bold font, color fill, automatic column width adjustment, etc.).

[0032] Process merged cell ranges.

[0033] Furthermore, in step 4, for large data volume scenarios, the SXSSF model is used to reduce memory usage and avoid OOM exceptions.

[0034] Furthermore, in step 5, the return method includes:

[0035] Send it directly to the browser via the HTTP response stream;

[0036] Generate a temporary download link for users to access;

[0037] A notification will be pushed to the user to download after the asynchronous task is completed.

[0038] This invention also claims a Java-based Excel file export system, comprising:

[0039] The request processing module is used to receive export requests from users via a web interface (such as a RESTful API) or a graphical interface.

[0040] The template parsing module is used to load and parse the Excel export template specified by the user.

[0041] The style rendering module is used to bind the dataset obtained from the database, cache or other data sources to the template, and to render the style according to the template configuration;

[0042] The file generation module is used to call the Apache POI library to create a Workbook object based on the user-selected export format (.xls or .xlsx) and write the rendered data into the worksheet;

[0043] The input module is used to return the generated Excel file to the user for download, or to store it in a target location, including a server, cloud storage, FTP, etc.

[0044] This system can implement the Excel file export method described above.

[0045] Furthermore, the system also includes the following optional functional modules:

[0046] Template Management Module: Provides a visual interface for users to create, edit, and delete Excel export templates; supports template version management and rollback; supports template sharing and access control; supports template import and export functions;

[0047] Log recording module: Records detailed information for each export operation, including time, user ID, template ID, export status, error messages, etc.; supports log query and analysis functions;

[0048] Performance optimization module: Uses caching mechanisms to reduce duplicate queries; employs asynchronous thread pools to execute export tasks, avoiding blocking the main thread; enables compression algorithms (such as GZIP) to improve network transmission efficiency; supports breakpoint resumption and retry mechanisms.

[0049] Exception handling module: Unified capture and handling of exceptions that may occur during the export process; provides user-friendly error messages; supports exception classification statistics and alarms;

[0050] API Interface Module: Provides standardized RESTful API interfaces for other systems to call; supports data exchange in formats such as JSON / XML; supports authentication methods such as OAuth2 and Token; provides SDK encapsulation for easy third-party integration;

[0051] The front-end interaction module provides front-end components based on mainstream frameworks including Vue.js, React, and Angular; it supports operations such as template selection, field filtering, preview, and export; it provides UI elements including export progress bars, result prompts, and download buttons; and it supports internationalization.

[0052] The present invention also claims a Java-based Excel file export device, comprising: at least one memory and at least one processor;

[0053] The at least one memory is used to store a machine-readable program;

[0054] The at least one processor is used to call the machine-readable program to implement the above method.

[0055] The present invention also claims a computer-readable medium storing computer instructions that, when executed by a processor, implement the above-described method.

[0056] Compared with existing technologies, the Excel file export method and system based on Java language of the present invention have the following advantages:

[0057] 1. Offers highly customizable Excel export functionality, supporting rich style configurations;

[0058] 2. Supports multiple Excel formats (.xls / .xlsx) and has good compatibility;

[0059] 3. Improve development efficiency and reduce maintenance costs;

[0060] 4. It can be integrated into various Java projects such as Spring Boot and microservice architecture;

[0061] 5. Provides a unified API interface, facilitating third-party calls and secondary development;

[0062] 6. It has good scalability and can support future additions of advanced Excel functions (such as charts, conditional formatting, etc.). Attached Figure Description

[0063] Figure 1 This is a diagram illustrating the architecture of an Excel file export system based on the Java language, provided in an embodiment of the present invention.

[0064] Figure 2 This is a flowchart illustrating the Excel file export process provided in an embodiment of the present invention. Detailed Implementation

[0065] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0066] This invention provides a method for exporting Excel files based on the Java language, including the following steps: receiving an export request; loading template configuration; data binding and style rendering; generating an Excel file; and returning or saving the file.

[0067] The template configuration includes column width, font, color, and cell merging rules.

[0068] The Excel file supports both .xls and .xlsx formats.

[0069] The data source can be one of the following: database query results, Java object collection, or JSON / XML data.

[0070] The specific implementation of this method includes the following steps:

[0071] Step 1: Receive Export Request. The system receives the user's export request through a web interface (such as a RESTful API) or a graphical interface. The request parameters include:

[0072] 1. Data source identifier (database table name, SQL statement, object collection, etc.);

[0073] 2. Export template identifier (preset template ID or uploaded Excel template file);

[0074] 3. Export format (.xls or .xlsx);

[0075] 4. Export field range (select specific columns);

[0076] 5. Pagination information (starting line number, number of items per page).

[0077] Step 2: Parse Template Configuration. The system loads and parses the user-specified Excel export template; the Excel export template can be one of the following forms:

[0078] 1. Pre-defined XML configuration file;

[0079] 2. Template records stored in the database;

[0080] 3. Excel files uploaded by users;

[0081] The template content includes the following information:

[0082] 1. Column definition, including column header, field mapping, column width, and alignment;

[0083] 2. Style definition, including font, color, background color, border, and cell merging rules;

[0084] 3. Dynamic placeholders (such as ${username}) are used to replace actual data later.

[0085] Step 3: Data Binding and Style Rendering. The system binds the dataset obtained from the database, cache, or other data sources to the template and renders the style according to the template configuration. The specific process includes:

[0086] 1. Map field values ​​from the data source to corresponding cells in the Excel spreadsheet;

[0087] 2. Apply the styles defined in the template to the corresponding fields (such as bold font, color fill, automatic column width adjustment, etc.);

[0088] 3. Process the merged cell range.

[0089] Step 4: Generate an Excel file. Based on the user-selected export format (.xls or .xlsx), the system calls the Apache POI library to create a Workbook object and writes the rendered data into the worksheet. For large data volumes, the SXSSF model is used to reduce memory usage and avoid OutOfMemoryError (OOM) exceptions.

[0090] Step 5: Return or Save the File System. The generated Excel file will be returned to the user for download, or stored in a target location including a server, cloud storage, FTP, etc. Return methods include:

[0091] 1. Send directly to the browser via the HTTP response stream;

[0092] 2. Generate a temporary download link for users to access;

[0093] 3. Push notification to the user to download after the asynchronous task is completed.

[0094] Depending on the requirements, the implementation of this method may also include the following optional functional modules:

[0095] The configuration management module is used to store and manage Excel export templates.

[0096] The logging module is used to record runtime logs during the export process.

[0097] The performance optimization module is used to handle memory and performance issues when exporting large amounts of data.

[0098] The template engine module is used to parse user-uploaded Excel template files and extract their style and structure information.

[0099] The exception handling module is used to capture and handle exceptions that occur during the export process.

[0100] The asynchronous task scheduling module is used to put exported tasks into a background thread pool for execution, thus avoiding blocking the main thread.

[0101] This method addresses the shortcomings of existing technologies, such as low data export efficiency, insufficient flexibility, and lack of capacity to handle complex styles and large-scale data. It utilizes core components including a request processing module, template parsing module, data binding module, style rendering module, and file generation module, and enhances system configurability through a configuration management module. Users can customize export templates and set export parameters through an intuitive interface, supporting complex style customization. This method not only improves the efficiency and quality of data export but also provides users with a flexible and easy-to-use data export solution.

[0102] This invention also provides an Excel file export system based on the Java language, which can implement the Excel file export method based on the Java language described in the above embodiments.

[0103] The system includes:

[0104] 1. Request processing module, used to receive export requests from users via a web interface (such as a RESTful API) or a graphical interface. Request parameters include:

[0105] (1) Data source identifier (database table name, SQL statement, object collection, etc.);

[0106] (2) Export template identifier (preset template ID or uploaded Excel template file);

[0107] (3) Export format (.xls or .xlsx);

[0108] (4) Export field range (select specific columns);

[0109] (5) Pagination information (starting line number, number of items per page).

[0110] 2. Template parsing module, used to load and parse the user-specified Excel export template. The Excel export template can be one of the following forms:

[0111] (1) Pre-defined XML configuration file;

[0112] (2) Template records stored in the database;

[0113] (3) Excel files uploaded by users;

[0114] The template content includes the following information:

[0115] (1) Column definition, including column header, field mapping, column width, and alignment;

[0116] (2) Style definition, including font, color, background color, border, and cell merging rules;

[0117] (3) Dynamic placeholders (such as ${username}) are used to replace real data later.

[0118] 3. The style rendering module is used to bind datasets obtained from the database, cache, or other data sources to the template and render styles according to the template configuration. The specific process includes:

[0119] (1) Map the field values ​​in the data source to the corresponding cells in the Excel table;

[0120] (2) Apply the styles defined in the template to the corresponding fields (such as bold font, color fill, automatic column width adjustment, etc.);

[0121] (3) Process the merged cell range.

[0122] 4. The file generation module is used to create a Workbook object by calling the Apache POI library based on the user-selected export format (.xls or .xlsx), and write the rendered data into the worksheet. For large data volume scenarios, the SXSSF model is used to reduce memory usage and avoid OOM exceptions.

[0123] 5. Input module: This module returns the generated Excel file to the user for download or stores it in a target location, including a server, cloud storage, or FTP. Return methods include:

[0124] (1) Send it directly to the browser via the HTTP response stream;

[0125] (2) Generate a temporary download link for users to access;

[0126] (3) Push notification to the user to download after the asynchronous task is completed.

[0127] The system also includes the following optional functional modules:

[0128] Template Management Module: Provides a visual interface for users to create, edit, and delete Excel export templates; supports template version management and rollback; supports template sharing and access control; supports template import and export functions.

[0129] Log recording module: Records detailed information for each export operation, including time, user ID, template ID, export status, error messages, etc.; supports log query and analysis functions.

[0130] Performance optimization module: Uses caching mechanisms to reduce duplicate queries; employs asynchronous thread pools to execute export tasks, avoiding blocking the main thread; enables compression algorithms (such as GZIP) to improve network transmission efficiency; supports breakpoint resumption and failure retry mechanisms.

[0131] Exception handling module: Unified capture and handling of exceptions that may occur during the export process; provides user-friendly error message prompts; supports exception classification statistics and alarms.

[0132] API Interface Module: Provides standardized RESTful API interfaces for other systems to call; supports data interaction in formats such as JSON / XML; supports authentication methods such as OAuth2 and Token; provides SDK encapsulation for easy integration by third parties.

[0133] The front-end interaction module provides front-end components based on mainstream frameworks including Vue.js, React, and Angular; it supports operations such as template selection, field filtering, preview, and export; it provides UI elements including export progress bars, result prompts, and download buttons; and it supports internationalization.

[0134] This invention also provides an Excel file export device based on the Java language, comprising: at least one memory and at least one processor;

[0135] The at least one memory is used to store a machine-readable program;

[0136] The at least one processor is used to call the machine-readable program to implement the Java-based Excel file export method described in the above embodiments.

[0137] This invention also provides a computer-readable medium storing computer instructions. When executed by a processor, the computer instructions cause the processor to perform the Java-based Excel file export method described in the above embodiments. Specifically, a system or apparatus equipped with a storage medium storing software program code that implements the functions of any of the embodiments described above, and enabling the computer (or CPU or MPU) of the system or apparatus to read and execute the program code stored in the storage medium.

[0138] In this case, the program code read from the storage medium can itself implement the function of any of the above embodiments, and therefore the program code and the storage medium storing the program code constitute part of the present invention.

[0139] Examples of storage media used to provide program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code can be downloaded from a server computer via a communication network.

[0140] Furthermore, it should be clear that not only can the program code read by the computer be executed, but also the operating system or other components operating on the computer can be instructed based on the program code to perform some or all of the actual operations, thereby achieving the function of any of the embodiments described above.

[0141] Furthermore, it is understood that the program code read from the storage medium is written to the memory set in the expansion board inserted into the computer or to the memory set in the expansion unit connected to the computer. Then, based on the instructions of the program code, the CPU or other components installed on the expansion board or expansion unit execute some and all of the actual operations, thereby realizing the function of any of the embodiments described above.

[0142] The present invention has been shown and described in detail above with reference to the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above embodiments, those skilled in the art will know that more embodiments of the present invention can be obtained by combining the code review methods in the different embodiments. These embodiments are also within the protection scope of the present invention.

Claims

1. A method for exporting Excel files based on the Java language, characterized in that, The implementation of this method includes the following steps: Step 1: Receive Export Request: The system receives the user's export request through a web interface or graphical interface; Step 2, Parse Template Configuration: The system loads and parses the user-specified Excel export template; Step 3, Data Binding and Style Rendering: The system binds the dataset obtained from the database, cache or other data sources to the template, and renders the style according to the template configuration; Step 4: Generate Excel file: Based on the export format selected by the user, the system calls the Apache POI library to create a Workbook object and writes the rendered data into the worksheet; Step 5: Return or save the file: The system will return the generated Excel file to the user for download, or store it in a target location including a server, cloud storage, or FTP.

2. The method for exporting Excel files based on Java language according to claim 1, characterized in that, Step 1, the request parameters include: data source identifier, export template identifier, export format, export field range, and pagination information.

3. The method for exporting Excel files based on Java language according to claim 1, characterized in that, The Excel export templates include the following formats: Pre-defined XML configuration file; Template records stored in the database; User-uploaded Excel files; The template content includes the following information: Column definition, including column header, field mapping, column width, and alignment; Style definitions, including font, color, background color, border, and cell merging rules; Dynamic placeholders are used to replace actual data later.

4. The method for exporting Excel files based on Java language according to claim 1, characterized in that, Step 3 specifically includes the following process: Map field values ​​from the data source to corresponding cells in the Excel spreadsheet; The corresponding fields apply the styles defined in the template; Process merged cell ranges.

5. The method for exporting Excel files based on Java language according to claim 1, characterized in that, In step 4, for large data volume scenarios, the SXSSF model is used to reduce memory usage and avoid OOM exceptions.

6. The method for exporting Excel files based on Java language according to claim 1, characterized in that, Step 5, the return method includes: Send it directly to the browser via the HTTP response stream; Generate a temporary download link for users to access; A notification will be pushed to the user to download after the asynchronous task is completed.

7. An Excel file export system based on the Java language, characterized in that, include: The request processing module is used to receive export requests from users via a web interface or graphical interface; The template parsing module is used to load and parse the Excel export template specified by the user. The style rendering module is used to bind the dataset obtained from the database, cache or other data sources to the template, and to render the style according to the template configuration; The file generation module is used to call the Apache POI library to create a Workbook object based on the export format selected by the user, and write the rendered data into the worksheet; The input module is used to return the generated Excel file to the user for download, or to store it in a target location including a server, cloud storage, or FTP. The system is capable of implementing the Excel file export method as described in any one of claims 1 to 6.

8. The Excel file export system based on Java language according to claim 7, characterized in that, The system also includes the following optional functional modules: Template Management Module: Provides a visual interface for users to create, edit, and delete Excel export templates; Supports template version management and rollback; supports template sharing and access control; supports template import and export functions; Log recording module: Records detailed information for each export operation, including time, user ID, template ID, export status, and error messages; Supports log query and analysis functions; Performance optimization module: Uses caching mechanisms to reduce duplicate queries; employs asynchronous thread pools to execute export tasks, avoiding blocking the main thread; enables compression algorithms to improve network transmission efficiency; supports breakpoint resumption and retry mechanisms. Exception handling module: Unified capture and handling of exceptions that may occur during the export process; provides user-friendly error message prompts; Supports anomaly classification statistics and alerts; API Interface Module: Provides standardized RESTful API interfaces for other systems to call; supports data interaction in JSON / XML formats; supports OAuth2 and Token authentication methods; provides SDK encapsulation for easy third-party integration; The front-end interaction module provides front-end components based on mainstream frameworks including Vue.js, React, and Angular; it supports template selection, field filtering, preview, and export operations; and it provides UI elements including an export progress bar, result display, and download button. Support internationalization.

9. An Excel file export device based on the Java language, characterized in that, include: At least one memory and at least one processor; The at least one memory is used to store a machine-readable program; The at least one processor is configured to invoke the machine-readable program to implement the method according to any one of claims 1 to 6.

10. A computer-readable medium, characterized in that, The computer-readable medium stores computer instructions that, when executed by a processor, implement the method described in any one of claims 1 to 6.

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