Spire.PDF for Java 12.1.4 は PDF 比較結果をファイルストリームに保存する機能をサポート

// Create a new PdfDocument object 'pdf1' to work with the first PDF file
        PdfDocument pdf1 = new PdfDocument();

        // Load the first PDF file from the specified path
        pdf1.loadFromFile("ComparePdfDocument_1.pdf");

        // Create a new PdfDocument object 'pdf2' to work with the second PDF file
        PdfDocument pdf2 = new PdfDocument();

        // Load the second PDF file from the specified path
        pdf2.loadFromFile("ComparePdfDocument_2.pdf");

        // Create a PdfComparer object 'compare' with 'pdf1' and 'pdf2' as parameters for comparison
        PdfComparer compare = new PdfComparer(pdf1, pdf2);

        // Set the page ranges to be compared using the options of the comparer
        compare.getOptions().setPageRanges(0, pdf1.getPages().getCount() - 1, 0, pdf2.getPages().getCount() - 1);

        String result = "output.pdf";
        File outFile = new File(result);

        // Create an output stream to write the document to the output file
        OutputStream outputStream = new FileOutputStream(outFile);

        // Compare the PDF documents and save 
        compare.compare(outputStream);

        // Dispose of system resources associated with 'pdf1'
        pdf1.dispose();

        // Dispose of system resources associated with 'pdf2'
        pdf2.dispose();