Java: Extract Table Data from PDF Document

Table is one of the most commonly used formatting elements in PDF. In some cases, you may need to extract data from PDF tables to perform further analysis. In this article, you will learn how to achieve this task programmatically in Java using Spire.PDF for Java.

Install Spire.PDF for Java

First of all, you're required to add the Spire.PDF.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.

  • Package Manager
<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>4.10.2</version>
    </dependency>
</dependencies>

Extract Table Data from PDF Document

Spire.PDF for Java uses the PdfTableExtractor.extractTable(int pageIndex) method to detect and extract tables from a desired PDF page.

The following are the steps to extract table data from a PDF file:

  • Load a sample PDF document using PdfDocument class.
  • Create a StringBuilder instance and a PdfTableExtractor instance.
  • Loop through the pages in the PDF, extract tables from each page into a PdfTable array using PdfTableExtractor.extractTable(int pageIndex) method.
  • Loop through the tables in the array.
  • Loop through the rows and columns in each table, after that extract data from each table cell using PdfTable.getText(int rowIndex, int columnIndex) method, then append the data to the StringBuilder instance using StringBuilder.append() method.
  • Write the extracted data to a txt document using Writer.write() method.
  • Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.utilities.PdfTable;
import com.spire.pdf.utilities.PdfTableExtractor;

import java.io.FileWriter;

public class ExtractTableData {
    public static void main(String []args) throws Exception {

        //Load a sample PDF document
        PdfDocument pdf = new PdfDocument("Sample.pdf");

        //Create a StringBuilder instance
        StringBuilder builder = new StringBuilder();
        //Create a PdfTableExtractor instance
        PdfTableExtractor extractor = new PdfTableExtractor(pdf);

        //Loop through the pages in the PDF
        for (int pageIndex = 0; pageIndex < pdf.getPages().getCount(); pageIndex++) {
            //Extract tables from the current page into a PdfTable array
            PdfTable[] tableLists = extractor.extractTable(pageIndex);
            
            //If any tables are found
            if (tableLists != null && tableLists.length > 0) {
                //Loop through the tables in the array
                for (PdfTable table : tableLists) {
                    //Loop through the rows in the current table
                    for (int i = 0; i < table.getRowCount(); i++) {
                        //Loop through the columns in the current table
                        for (int j = 0; j < table.getColumnCount(); j++) {
                            //Extract data from the current table cell and append to the StringBuilder 
                            String text = table.getText(i, j);
                            builder.append(text + " | ");
                        }
                        builder.append("\r\n");
                    }
                }
            }
        }

        //Write data into a .txt document
        FileWriter fw = new FileWriter("ExtractTable.txt");
        fw.write(builder.toString());
        fw.flush();
        fw.close();
    }
}

The input PDF:

Java: Extract Table Data from PDF Document

The output .txt document with extracted table data:

Java: Extract Table Data from PDF Document

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