Extract text from PDF documents

To extract a text from PDF documents getText and getText(int) methods are used. These methods allow to extract a text from the entire document or a text from the selected page.

Here are the steps to extract a text from PDF document:

  • Instantiate Parser object for the initial document;
  • Call getText method and obtain TextReader object;
  • Read a text from reader.

The following example demonstrates how to extract a text from PDF document:

// Create an instance of Parser class
try (Parser parser = new Parser(Constants.SamplePdf)) {
    // Extract a text into the reader
    try (TextReader reader = parser.getText()) {
        // Print a text from the document
        System.out.println(reader.readToEnd());
    }
}

Here are the steps to extract a text from the page of PDF document:

The following example demonstrates how to extract a text from the page of PDF document:

// Create an instance of Parser class
try (Parser parser = new Parser(Constants.SamplePdf)) {
    // Get the document info
    IDocumentInfo documentInfo = parser.getDocumentInfo();
    // Iterate over pages
    for (int p = 0; p < documentInfo.getPageCount(); p++) {
        // Print a page number
        System.out.println(String.format("Page %d/%d", p + 1, documentInfo.getPageCount()));
        // Extract a text into the reader
        try (TextReader reader = parser.getText(p)) {
            // Print a text from the document page
            System.out.println(reader.readToEnd());
        }
    }
}

Raw mode allows to increase the speed of text extraction due to poor formatting accuracy. getText(TextOptions) and getText(int, TextOptions) methods are used to extract a text in raw mode.

Here are the steps to extract a raw text from the page of PDF document:

The following example demonstrates how to extract a raw text from the page of PDF document:

// Create an instance of Parser class
try (Parser parser = new Parser(Constants.SamplePdf)) {
    // Check if the document supports text extraction
    if (!parser.getFeatures().isText()) {
        System.out.println("Document isn't supports text extraction.");
        return;
    }
    // Get the document info
    DocumentInfo documentInfo = parser.getDocumentInfo() instanceof DocumentInfo
            ? (DocumentInfo) parser.getDocumentInfo()
            : null;
    // Check if the document has pages
    if (documentInfo == null || documentInfo.getRawPageCount() == 0) {
        System.out.println("Document hasn't pages.");
        return;
    }
    // Iterate over pages
    for (int p = 0; p < documentInfo.getRawPageCount(); p++) {
        // Print a page number
        System.out.println(String.format("Page %d/%d", p + 1, documentInfo.getPageCount()));
        // Extract a text into the reader
        try (TextReader reader = parser.getText(p, new TextOptions(true))) {
            // Print a text from the document
            // We ignore null-checking as we have checked text extraction feature support earlier
            System.out.println(reader.readToEnd());
        }
    }
}

More resources

GitHub examples

You may easily run the code above and see the feature in action in our GitHub examples:

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