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Draw a Line on PDF with Java REST API

This tutorial shows you how to Java REST API can be used to draw a line on a PDF [PDF file info] using the Aspose.PDF Cloud SDK for Java. You will learn to automatically add lines to a PDF document through a Java‑based cloud service and discover the properties and methods that let you customize those lines.

Prerequisite

Steps to Add Line in PDF with Java Low Code API

  1. Create the PdfApi object with your API key and SID for drawing lines.
  2. Instantiate a LineAnnotation object and set the desired parameters (rectangle, color, start/end points, style, dates, etc.).
  3. Upload the PDF file to Aspose Cloud storage so the annotation can be applied.
  4. Call the PostPageLineAnnotations() method to draw the line on the specified page.
  5. Download the updated PDF file that now contains the line.

These steps describe how to add lines to a PDF with the Java REST interface. Create an instance of PdfApi by providing the required authentication properties, then build a LineAnnotation with its rectangle, color, start and end points, line style, creation and modification dates. After uploading the PDF, invoke PostPageLineAnnotations() to embed the line.

Code to Draw Lines on PDF with Java Low Code API

The sample demonstrates drawing a line on a PDF using the Java SDK. You can configure the intent, caption position, show‑caption flag, leader‑line offset, leader‑line extension, leader‑line style, and interior color. Ensure the Rect variable is initialized, as it defines the annotation’s bounding box, while the start and end points determine the line’s geometry.

If you need to highlight content instead of drawing lines, see the article on Highlight PDF Document with Java REST API.

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