Method and system for exporting PDF (Portable Document Format) of operator report

Abstract

The invention discloses an operator report PDF exporting method and system, and belongs to the technical field of report generation and document typeset.The method comprises the following steps that a data set and a field name list of a report to be exported are received; dynamically generating a header according to the field name list, and calling a PdfPTable to create a table; for each row of data in the table, estimating the height of the row and comparing the height with the remaining available height of the current page, if the height is not enough, calling document.newPage () for paging, and reconstructing a header on a new page; and for the cells, the Phrase is used for measuring and calculating the text size, and setNoWrap (false) and the minimum height are set so as to realize column width self-adaption and automatic line feed. According to the method, the report export flexibility, attractiveness and readability are remarkably improved, and the multi-scene and multi-format customization requirements of operators are met.

Description

Technical Field

[0001] This invention relates to the field of report generation and document layout technology, specifically a method and system for exporting operator reports to PDF. Background Technology

[0002] In their daily operations management, telecom operators need to generate various types of reports, including call volume statistics, user profiles, billing details, and marketing analysis. Because the fields required for these reports constantly change with the analysis dimensions and business needs, the number of data columns and field combinations cannot be fully determined during the design phase. At the same time, operators have high requirements for the visual standardization and brand consistency of their reports, needing exported PDF documents to maintain a consistent title format, header style, pagination, and summary layout across different scenarios. However, existing PDF export components, such as iText's default pagination, JasperReports templates, or OpenOffice-based PDF export, all have the following main shortcomings:

[0003] Coarse pagination granularity: Traditional iText's default strategy (such as splitLate=true) usually reserves the height of a row when inserting a whole row of data into the page, and then checks whether it overflows; if it overflows, it moves the whole row to the next page, but the original blank reserved row height is not recycled, resulting in a blank area of ​​the whole row height on the current page, wasting the available page space and being visually unappealing.

[0004] Static templates: Tools such as JasperReports or iReport require predefined column templates during design. Any addition, removal, or order adjustment of fields necessitates redesigning the template, which is not conducive to quickly responding to business changes.

[0005] Misaligned summary rows across pages: In traditional PDF export solutions, summary rows are typically treated as regular data rows appended to the end of the report, lacking field binding or positional constraints. When a report is paginated, the position of the summary rows is difficult to control precisely, often resulting in the following problems: First, summary columns cannot be aligned with their corresponding fields; second, the summary row position drifts after pagination, with some fields appearing on new pages while others remain on the previous page; third, non-repeating headers make it difficult to identify the meaning of summary columns on new pages. This structural disorder directly affects the audit accuracy and user understanding of the report, especially in scenarios with multi-level summaries or dynamic field output, where the problem is particularly prominent.

[0006] The column width and line wrapping strategies are limited: iText's setNoWrap(false) only provides a single automatic line wrapping function, but it cannot take into account the differences in text length, or it fixes the column width by hard coding, making it difficult to ensure the overall balance and aesthetics of the table layout.

[0007] Therefore, there is an urgent need for a PDF export solution that can dynamically configure export fields, intelligent pagination and automatic line wrapping, precise alignment of cross-page summaries, and a unified header style to meet the operators' dual needs for report functionality and visual effects. Summary of the Invention

[0008] The technical objective of this invention is to address the above-mentioned shortcomings by providing a method and system for exporting operator reports to PDF. Through sophisticated typesetting algorithms and modular design, it achieves runtime configuration of export fields, visual automatic pagination, and unified style output; significantly improving the flexibility, aesthetics, and readability of report export, and meeting the customized needs of operators in multiple scenarios and formats.

[0009] The technical solution adopted by this invention to solve its technical problem is:

[0010] A method for exporting operator reports to PDF, the implementation of which includes the following steps:

[0011] (1) Receive the data set and field name list of the report to be exported;

[0012] (2) Dynamically generate table headers based on the list of field names, and call PdfPTable to create the table;

[0013] (3) For each row of data in the table, estimate the height of the row and compare it with the remaining available height of the current page. If it is insufficient, call document.newPage() to paginate and rebuild the table header on the new page.

[0014] (4) For cells, use Phrase to calculate text size, set setNoWrap(false) and minimum height to achieve adaptive column width and automatic line wrapping;

[0015] (5) At the end of the table or at the page crossing position, output the multi-level summary header row and summary value row in the order of fields to ensure that the summary row is aligned with the corresponding column when crossing pages;

[0016] (6) Customize the onStartPage event of PdfPageEventHelper to draw the company name, date, page number and double horizontal lines to achieve a unified header template;

[0017] (7) Finally, output and save the PDF file.

[0018] This method enables PDF export based on the iText library, suitable for telecom operator reports where the number of columns and field content dynamically changes, and where visual appeal and cross-page alignment are critical. Through sophisticated typesetting algorithms and modular design, this method achieves runtime configuration of export fields, visual automatic pagination, and consistent output style.

[0019] Furthermore, the list of field names and the data set are dynamically passed in by the caller at runtime, without requiring modification of the template;

[0020] It supports receiving the required field list and corresponding data model at runtime, and automatically generating the report header structure and data cell content according to the field order; through parameterized configuration, the number of columns in the report can be dynamically increased or decreased according to the actual business, without the need for pre-designed templates, thereby realizing dynamic generation of the structure and improving versatility and maintainability.

[0021] Furthermore, in the pagination determination, the estimated row height is obtained by calling PdfPCell.getMaxHeight() or ColumnText simulation calculation.

[0022] Furthermore, the specific process for achieving precise line-by-line pagination includes:

[0023] First, calculate the effective height of each page based on the page size and top and bottom margins;

[0024] For each row of data, calculate its height in advance before insertion;

[0025] Compare the current cumulative row height with the remaining page height. If the current row cannot accommodate the data, then paginate the page.

[0026] After the new page is enabled, the table headers will be regenerated and data will continue to be populated.

[0027] This logical judgment avoids the blank areas of entire lines caused by traditional pagination, improving page utilization and layout compactness;

[0028] After the table is rebuilt, the table header is automatically re-inserted to ensure consistency across pages.

[0029] Furthermore, when constructing cells, the text length is automatically measured based on the phrase, and line breaks and column widths are dynamically controlled according to the content to ensure that both long and short fields are displayed neatly. All cells are set with a uniform minimum height and an automatic line wrapping strategy is enabled to allow the text to be naturally distributed within a limited space, so as to avoid text truncation or single-column crowding issues and improve the overall layout aesthetics and consistency.

[0030] Furthermore, insert multi-level group summary rows according to business needs, while maintaining consistency with the column order;

[0031] Step (5) mainly addresses the alignment issue between summary rows and fields in cross-page scenarios, and its implementation logic is as follows:

[0032] First, generate a summary header row based on the column order, keeping it consistent with the original table structure;

[0033] Next, insert the corresponding summary value row, ensuring that each value is precisely aligned with its field.

[0034] If pagination occurs, the table header and summary structure are rebuilt on the new page to ensure that the summary content and the correspondence between context fields can still be correctly displayed when crossing pages.

[0035] This strategy can adapt to multi-level grouping and statistical scenarios, effectively avoiding the drift of summary fields or structural disorder.

[0036] Furthermore, in step (6), a page lifecycle management mechanism is used to uniformly insert header information at the beginning of each page, including elements such as company name, current export date, page number identifier and visual separator line; this mechanism does not require manual setting and can be automatically applied to each page output, ensuring that the PDF document maintains the consistency of brand identity and the standardization of layout when displayed on multiple pages.

[0037] This step is automatically triggered at the beginning of each page, outputting the company brand, date, and page number, and drawing a separator line to ensure consistent style across pages.

[0038] This invention also claims a carrier report PDF export system, comprising:

[0039] The dynamic field filtering module is used to receive the data set and field name list of the report to be exported; dynamically generate the table header based on the field name list, and call PdfPTable to create the table;

[0040] The fine-grained dynamic pagination module is used to estimate the height of each row of data in the table and compare it with the remaining available height of the current page. If it is insufficient, it calls document.newPage() to paginate and rebuilds the table header on the new page.

[0041] The column width auto-adjustment and intelligent line wrapping module is used to calculate cell text size using Phrase, and set setNoWrap(false) and minimum height to achieve column width auto-adjustment and automatic line wrapping;

[0042] The multi-level summary row alignment module is used to output multi-level summary header rows and summary value rows in the order of fields at the end of the table or at the beginning of a page, so as to ensure that the summary rows are aligned with the corresponding columns when crossing pages.

[0043] The Unified Header Template module is used to customize the onStartPage event of PdfPageEventHelper to draw the company name, date, page number, and double horizontal lines, thus achieving a unified header template.

[0044] The system uses the method described above to export operator reports as PDFs.

[0045] The present invention also claims a carrier report PDF export device, comprising: at least one memory and at least one processor;

[0046] The at least one memory is used to store a machine-readable program;

[0047] The at least one processor is used to call the machine-readable program to implement the above method.

[0048] The present invention also claims a computer-readable medium storing computer instructions that, when executed by a processor, enable the implementation of the above-described method.

[0049] Compared with the prior art, the operator report PDF export method and system of the present invention have the following advantages:

[0050] Beneficial effects:

[0051] This invention's method can flexibly add or delete exported fields based on business scenarios where the number of columns and content in operator reports are uncertain. It achieves fine-grained pagination, intelligent line wrapping, multi-level summary cross-page alignment, and a unified enterprise-level header. Employing a real row height calculation and dynamic reordering mechanism, it is significantly superior to existing static templates and coarse pagination schemes, greatly improving the flexibility, aesthetics, and readability of report output, reducing maintenance costs, and meeting the customization needs of multiple scenarios. Attached Figure Description

[0052] Figure 1 This is a flowchart illustrating the operator report PDF export method provided in this embodiment of the invention;

[0053] Figure 2 This is an example image of generating PDF images provided in an embodiment of the present invention;

[0054] Figure 3 This is a simplified example diagram of the summary data of the specified column of the output provided by the embodiments of the present invention. Detailed Implementation

[0055] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0056] A method for exporting operator reports to PDF, the implementation of which includes the following steps:

[0057] 1. Receive the data set and field name list of the report to be exported;

[0058] 2. Dynamically generate table headers based on the list of field names, and call PdfPTable to create the table;

[0059] 3. For each row of data in the table, estimate the height of the row and compare it with the remaining available height of the current page. If it is insufficient, call document.newPage() to paginate and rebuild the table header on the new page;

[0060] 4. For cells, use Phrase to calculate text size, set setNoWrap(false) and minimum height to achieve adaptive column width and automatic line wrapping;

[0061] 5. At the end of the table or at the beginning of a page, output the multi-level summary header row and summary value row in the order of the fields to ensure that the summary row is aligned with the corresponding column when crossing pages.

[0062] 6. Customize the onStartPage event of PdfPageEventHelper to draw the company name, date, page number, and double horizontal lines to achieve a unified header template;

[0063] 7. Finally, output and save the PDF file.

[0064] The list of field names and the data set are dynamically passed in by the caller at runtime, without requiring modification of the template.

[0065] In the pagination determination, the estimated row height is obtained by calling PdfPCell.getMaxHeight() or ColumnText simulation calculation.

[0066] After the table is rebuilt, the table header is automatically re-inserted to ensure consistency across pages.

[0067] The multi-level summary row alignment module can insert multi-level grouped summary rows according to business needs, while maintaining consistency with the column order.

[0068] The implementation of this method includes the following key technical points:

[0069] Field-level dynamic filtering, freeing you from template constraints:

[0070] This method supports automatically constructing table headers and body content by passing in a list of field names and field models from an external source at runtime, truly achieving dynamic report structure. Compared to static template methods such as JasperReports, it avoids the tedious process of redesigning templates every time fields change, significantly improving maintenance efficiency and versatility.

[0071] Estimate row height to improve page utilization:

[0072] Traditional iText pagination mechanisms (such as the default `splitLate=true` strategy) reserve height space for a row before inserting it, then check for overflow. If overflow occurs, the entire row is moved to the next page, but the reserved space is not reclaimed, leaving a blank space for the entire row's height on the current page, resulting in wasted page space and layout fragmentation. This method, however, pre-calculates the actual height of the row before insertion using `PdfPCell.getMaxHeight()` or ColumnText simulation, and compares it with the remaining space before insertion. If the space is insufficient, it immediately paginates, then rebuilds the table structure and header, without reserving space. This "pre-insertion pagination check" strategy avoids blank areas and improves the compactness and consistency of page layout.

[0073] Column width auto-adjustment and intelligent text wrapping enhance report aesthetics:

[0074] By calculating text length and configuring `setNoWrap(false)` and a uniform `MinimumHeight`, this solution can automatically control line breaks based on content length, ensuring that text of varying lengths is naturally arranged within cells without overflow or breaks. Compared to traditional components with fixed column widths or static styles, it offers better layout adaptability and consistency.

[0075] Cross-page summaries are precisely aligned, ensuring a clear and well-organized structure.

[0076] For summary row layout in paginated scenarios, this method adopts a "field order-driven + step-by-step summary row drawing" strategy: first output the summary header row, then output the corresponding values, ensuring that they are completely aligned with the aforementioned field columns, and automatically rebuild the table header on the new page. This design completely avoids the misalignment phenomena of "summary drift" or "unclear column names" in traditional exports, and is particularly suitable for complex statistical reports of telecom operators.

[0077] A unified header template mechanism strengthens brand consistency:

[0078] Leveraging iText's page event mechanism, this method automatically inserts the company logo, export date, page number, and double horizontal line separator elements on each page through a custom `onStartPage()` method of `PdfPageEventHelper`, achieving template-level header consistency. Unlike conventional components that rely on manual template settings or are only effective on the first page, this mechanism applies to all pagination, resulting in more standardized and recognizable output.

[0079] This method has significant innovations and advantages compared to existing technologies: runtime field configuration greatly improves flexibility; row-level pagination based on actual dimensions compensates for the coarse pagination of existing components; intelligent line wrapping and adaptive column width improve the aesthetics of the layout; precise alignment of cross-page summaries solves the problem of misalignment; and a unified header template enhances brand consistency.

[0080] Combined with appendix Figure 1 As shown, the specific implementation of this method is as follows:

[0081] 1. Dynamic field filtering.

[0082] This module supports receiving and exporting the required field list and corresponding data model at runtime, and automatically generating the report header structure and data cell content according to the field order. Through parameterized configuration, the number of columns in the report can be dynamically added or removed according to actual business needs, without the need for pre-designed templates, thereby achieving dynamic generation of the structure and improving versatility and maintainability.

[0083] 2. Refined dynamic pagination.

[0084] This module implements precise pagination line by line through the following steps:

[0085] First, calculate the effective height of each page based on the page size and top and bottom margins;

[0086] For each row of data, calculate its height in advance before insertion;

[0087] Compare the current cumulative row height with the remaining page height. If the current row cannot accommodate the data, then paginate the page.

[0088] Once the new page is enabled, the table headers will be regenerated and data will continue to be populated.

[0089] This logical judgment avoids the blank areas in a whole row caused by traditional pagination, improving page utilization and layout compactness.

[0090] 3. Column width adaptive and intelligent line wrapping.

[0091] This module automatically measures text length when creating cells and dynamically controls line breaks and column widths based on the content, ensuring that both long and short fields are displayed neatly. All cells are set to a uniform minimum height and an automatic line wrapping strategy is enabled, allowing text to be naturally distributed within a limited space, avoiding text truncation or crowded single columns, and improving the overall aesthetics and consistency of the layout.

[0092] 4. Alignment of multi-level summary rows.

[0093] This module primarily addresses the alignment issue between summary rows and fields when spanning multiple pages, employing the following logic:

[0094] First, generate a summary header row based on the column order, keeping it consistent with the original table structure;

[0095] Next, insert the corresponding summary value row, ensuring that each value is precisely aligned with its field;

[0096] If pagination occurs, the table header and summary structure are rebuilt on the new page to ensure that the summary content and the correspondence between context fields can still be correctly displayed when crossing pages.

[0097] This strategy can adapt to multi-level grouping and statistical scenarios, effectively avoiding the drift of summary fields or structural disorder.

[0098] 5. Use a standardized header template.

[0099] This module uses a page lifecycle management mechanism to uniformly insert header information at the beginning of each page, including elements such as the company name, current export date, page number identifier, and visual separator lines. This mechanism requires no manual setup and automatically applies to each output page, ensuring that the PDF document maintains consistent brand identity and layout standards when displayed across multiple pages.

[0100] This module is automatically triggered at the beginning of each page, outputting the company brand, date, and page number, and drawing a separator line to ensure consistent style across pages.

[0101] This method addresses the high requirements of operators for dynamically changing report columns and content, visual appeal, and cross-page consistency. It proposes a PDF export method based on iText, featuring dynamic pagination, dynamic field filtering, adaptive column width, multi-level summary alignment, and a unified header template. Report columns can be flexibly added or removed according to business needs, with precise calculation of row height for dynamic pagination, intelligent line wrapping and alignment of summary rows, and automatic generation of a unified enterprise-level header on each page. This method originated from an operator's need for flexible design and export of PDF reports. Compared to existing fixed template methods, this method significantly improves the flexibility, aesthetics, and readability of report export, meeting the operator's customized needs across multiple scenarios and formats.

[0102] This invention also provides a carrier report PDF export system, the system comprising:

[0103] 1. Dynamic field filtering module, used to receive the data set and field name list of the report to be exported; dynamically generate table headers based on the field name list, and call PdfPTable to create the table.

[0104] This module supports receiving and exporting the required field list and corresponding data model at runtime, and automatically generating the report header structure and data cell content according to the field order. Through parameterized configuration, the number of columns in the report can be dynamically added or removed according to actual business needs, without the need for pre-designed templates, thereby achieving dynamic generation of the structure and improving versatility and maintainability.

[0105] 2. The fine-grained dynamic pagination module is used to estimate the height of each row of data in the table and compare it with the remaining available height of the current page. If it is insufficient, it calls document.newPage() to paginate and rebuilds the table header on the new page.

[0106] This module implements precise pagination line by line through the following steps:

[0107] First, calculate the effective height of each page based on the page size and top and bottom margins;

[0108] For each row of data, calculate its height in advance before insertion;

[0109] Compare the current cumulative row height with the remaining page height. If the current row cannot accommodate the data, then paginate the page.

[0110] Once the new page is enabled, the table headers will be regenerated and data will continue to be populated.

[0111] This logical judgment avoids the blank areas in a whole row caused by traditional pagination, improving page utilization and layout compactness.

[0112] 3. The column width adaptive and intelligent line wrapping module is used to calculate the cell text size using Phrase, and set setNoWrap(false) and minimum height to achieve column width adaptive and automatic line wrapping.

[0113] This module automatically measures text length when creating cells and dynamically controls line breaks and column widths based on the content, ensuring that both long and short fields are displayed neatly. All cells are set to a uniform minimum height and an automatic line wrapping strategy is enabled, allowing text to be naturally distributed within a limited space, avoiding text truncation or crowded single columns, and improving the overall aesthetics and consistency of the layout.

[0114] 4. The multi-level summary row alignment module is used to output multi-level summary header rows and summary value rows in the order of fields at the end of the table or at the beginning of a page, so as to ensure that the summary rows are aligned with the corresponding columns when crossing pages.

[0115] This module primarily addresses the alignment issue between summary rows and fields when spanning multiple pages, employing the following logic:

[0116] First, generate a summary header row based on the column order, keeping it consistent with the original table structure;

[0117] Next, insert the corresponding summary value row, ensuring that each value is precisely aligned with its field;

[0118] If pagination occurs, the table header and summary structure are rebuilt on the new page to ensure that the summary content and the correspondence between context fields can still be correctly displayed when crossing pages.

[0119] This strategy can adapt to multi-level grouping and statistical scenarios, effectively avoiding the drift of summary fields or structural disorder.

[0120] 5. Unified header template module, used to customize the onStartPage event of PdfPageEventHelper, draw the company name, date, page number and double horizontal lines to achieve a unified header template.

[0121] This module uses a page lifecycle management mechanism to uniformly insert header information at the beginning of each page, including elements such as the company name, current export date, page number identifier, and visual separator lines. This mechanism requires no manual setup and automatically applies to each output page, ensuring that the PDF document maintains consistent brand identity and layout standards when displayed across multiple pages.

[0122] This module is automatically triggered at the beginning of each page, outputting the company brand, date, and page number, and drawing a separator line to ensure consistent style across pages.

[0123] This system achieves the export of operator reports to PDF using the operator report PDF export method described in the above embodiments:

[0124] The dynamic field filtering module receives the data set and field name list of the report to be exported;

[0125] The table header is dynamically generated based on the list of field names, and PdfPTable is called to create the table;

[0126] For each row of data in the table, the height of the row is estimated by the fine dynamic pagination module and compared with the remaining available height of the current page. If it is insufficient, document.newPage() is called to paginate and the table header is rebuilt on the new page.

[0127] For cells, the Phrase module is used to calculate the text size through column width adaptation and intelligent line wrapping. Set setNoWrap(false) and minimum height to achieve column width adaptation and automatic line wrapping.

[0128] The multi-level summary row alignment module outputs the multi-level summary header row and summary value row in the order of fields at the end of the table or at the page crossing position, so as to ensure that the summary row is aligned with the corresponding column when crossing pages.

[0129] By using the unified header template module, the onStartPage event of PdfPageEventHelper can be customized to draw the company name, date, page number, and double horizontal lines, thus achieving a unified header template.

[0130] Finally, output and save a PDF file.

[0131] This invention also provides a carrier report PDF export device, comprising: at least one memory and at least one processor;

[0132] The at least one memory is used to store a machine-readable program;

[0133] The at least one processor is used to call the machine-readable program to implement the operator report PDF export method described in the above embodiments.

[0134] 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 operator report PDF 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 above embodiments can be provided, and the computer (or CPU or MPU) of the system or apparatus can read and execute the program code stored in the storage medium.

[0135] 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.

[0136] 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.

[0137] 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 realizing the function of any of the embodiments described above.

[0138] 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.

[0139] 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 operator reports to PDF, characterized in that, The implementation of this method includes the following steps: (1) Receive the data set and field name list of the report to be exported; (2) Dynamically generate table headers based on the list of field names, and call PdfPTable to create the table; (3) For each row of data in the table, estimate the height of the row and compare it with the remaining available height of the current page. If it is insufficient, call document.newPage() to paginate and rebuild the table header on the new page. (4) For cells, use Phrase to calculate text size, set setNoWrap(false) and minimum height to achieve adaptive column width and automatic line wrapping; (5) At the end of the table or at the page crossing position, output the multi-level summary header row and summary value row in the order of fields to ensure that the summary row is aligned with the corresponding column when crossing pages; (6) Customize the onStartPage event of PdfPageEventHelper to draw the company name, date, page number and double horizontal lines to achieve a unified header template; (7) Finally, output and save the PDF file.

2. The method for exporting operator reports to PDF according to claim 1, characterized in that, The list of field names and the data set are dynamically passed in by the caller at runtime, without requiring modification of the template; It supports receiving the required field list and corresponding data model at runtime, and automatically generating the report header structure and data cell content according to the field order; Through parameterized configuration, the number of columns in the report can be dynamically increased or decreased according to the actual business needs, without the need for pre-designed templates, thus achieving dynamic generation of the structure.

3. The method for exporting operator reports to PDF according to claim 1, characterized in that, In the pagination determination, the estimated row height is obtained by calling PdfPCell.getMaxHeight() or ColumnText simulation calculation.

4. A method for exporting operator reports to PDF according to claim 1 or 3, characterized in that, The specific process of achieving precise pagination line by line includes: First, calculate the effective height of each page based on the page size and top and bottom margins; For each row of data, calculate its height in advance before insertion; Compare the current cumulative row height with the remaining page height. If the current row cannot accommodate the data, then paginate the page. After the new page is enabled, the table headers will be regenerated and data will continue to be populated. After the table is rebuilt, the table header is automatically re-inserted to ensure consistency across pages.

5. The method for exporting operator reports to PDF according to claim 1, characterized in that, When creating cells, the text length is automatically measured based on the phrase, and line breaks and column width are dynamically controlled according to the content to ensure that both long and short fields are displayed neatly. All cells are set to a uniform minimum height and an automatic line wrapping strategy is enabled to allow the text to be naturally distributed within a limited space, so as to avoid text truncation or single-column crowding.

6. The method for exporting operator reports to PDF according to claim 1, characterized in that, Insert multi-level group summary rows according to business needs, and keep them consistent with the column order; The logic for step (5) is as follows: First, generate a summary header row based on the column order, keeping it consistent with the original table structure; Next, insert the corresponding summary value row, ensuring that each value is precisely aligned with its field. If pagination occurs, the table header and summary structure are rebuilt on the new page to ensure that the summary content and the correspondence between context fields can still be correctly displayed when crossing pages.

7. The method for exporting operator reports to PDF according to claim 1, characterized in that, In step (6), the page lifecycle management mechanism is used to uniformly insert header information at the beginning of each page, including the company name, current export date, page number identifier and visual separator line elements; This step is automatically triggered at the beginning of each page, outputting the company brand, date, and page number, and drawing a separator line to ensure consistent style across pages.

8. A carrier report PDF export system, characterized in that, include: The dynamic field filtering module is used to receive the data set and field name list of the report to be exported; The table header is dynamically generated based on the list of field names, and PdfPTable is called to create the table; The fine-grained dynamic pagination module is used to estimate the height of each row of data in the table and compare it with the remaining available height of the current page. If it is insufficient, it calls document.newPage() to paginate and rebuilds the table header on the new page. The column width auto-adjustment and intelligent line wrapping module is used to calculate cell text size using Phrase, and set setNoWrap(false) and minimum height to achieve column width auto-adjustment and automatic line wrapping; The multi-level summary row alignment module is used to output multi-level summary header rows and summary value rows in the order of fields at the end of the table or at the beginning of a page, so as to ensure that the summary rows are aligned with the corresponding columns when crossing pages. The Unified Header Template module is used to customize the onStartPage event of PdfPageEventHelper to draw the company name, date, page number, and double horizontal lines, thus achieving a unified header template. The system enables the export of operator reports to PDF using the method described in any one of claims 1 to 7.

9. A device for exporting operator reports to PDF, 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 7.

10. A computer-readable medium, characterized in that, The computer-readable medium stores computer instructions that, when executed by a processor, enable the implementation of the method described in any one of claims 1 to 7.

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