File APIs for Word/Excel/PowerPoint/PDF

 PDF files are widely used in various industries, especially for reports, contracts, invoices, and other structured documents. When there is a need to extract data from a PDF file for further analysis, converting PDF to Excel becomes a common requirement. This article will demonstrate how to convert a PDF file to Excel using Java, along with custom settings to optimize the conversion of complex PDFs. 1. Introduction to PDF to Excel Conversion PDF files are typically used for presenting content, but sometimes we need to convert them to Excel format for better data processing and analysis. By converting PDF to Excel, users can easily extract tabular data and automate processing. Using Java, this conversion can be easily achieved with just a few API calls. 2. Prerequisites Before starting the coding process, make sure you have the following dependencies installed: Java Development Kit (JDK 1.8 or later) : Download and install it from Oracle's official website . Spire.PDF for Java : A ...

PDF files are very common in modern work environments and are widely used for contracts, reports, eBooks, and various other purposes. When working with PDF files, it is important not only to focus on the document's content but also on its property information. Setting appropriate PDF properties can enhance document management, archiving, and search efficiency. In this article, we will show you how to use Python to set standard and custom PDF document properties. 1. Introduction to PDF Document Properties PDF document properties are usually divided into two categories: standard properties and custom properties. Standard properties are the metadata that comes with a PDF file, while custom properties allow users to add personalized data as needed. 1.1 Standard Document Properties Standard properties are the metadata of a PDF file. Common properties include: Title : The name or description of the document, helping to identify the file content. Author : The creator of the document. Subj...

  Excel files are commonly used in backend systems for reporting, data exchange, and batch processing. In many projects, they act as structured data containers moving between services, departments, or external systems. However, once password protection is applied, automated workflows can easily break. You may run into situations like: A scheduled job fails because the uploaded file requires an open password The file loads successfully, but certain worksheets cannot be modified A data import module crashes due to unexpected encryption These issues are not rare in Java backend development. Especially in reporting systems, batch processors, or import/export modules, improper handling of password-protected Excel files can directly affect system stability. In this article, we’ll walk through how to handle Excel password operations in Java, including: Detecting whether an Excel file is password protected Removing a workbook open password Resetting an existing password Unprotecting a spec...