如何使用Itext将数据库表格检索为PDF并在下载前在浏览器中显示[JSP]

Question

我编写了一个代码来从数据库中检索表，并使用Itext库将其转换为PDF表。目前，PDF文件会自动下载到默认位置。但我想在浏览器中显示它并让用户选择下载PDF。

对于段落和文本，我发现它可以转换为字节数组，可以发送到浏览器但是可以为整个表做什么？

[这是我的DaoImpl]

@Override
public PdfPTable reportGenerator() throws SQLException, FileNotFoundException, DocumentException {

    String sql = "select * from projects";
    Connection conn = Database.getConnection();
    PreparedStatement stmt = conn.prepareStatement(sql);
    ResultSet rs = stmt.executeQuery();

    PdfPTable reportTable = new PdfPTable(4);
    PdfPCell tableCell;

    DateFormat df = new SimpleDateFormat("yyyy-MM-dd");

    tableCell = new PdfPCell(new Phrase("Id"));
    tableCell.setBorderWidth(1);
    tableCell.setBorderColor(Color.BLUE);
    reportTable.addCell(tableCell);

    tableCell = new PdfPCell(new Phrase("Title"));
    tableCell.setBorderColor(Color.BLUE);
    tableCell.setBorderWidth(1);
    reportTable.addCell(tableCell);

    tableCell = new PdfPCell(new Phrase("StartDate"));
    tableCell.setBorderColor(Color.BLUE);
    tableCell.setBorderWidth(1);
    reportTable.addCell(tableCell);

    tableCell = new PdfPCell(new Phrase("Deadline"));
    tableCell.setBorderColor(Color.BLUE);
    tableCell.setBorderWidth(1);
    reportTable.addCell(tableCell);
    int counter = 1;

    while (rs.next()) {
        String str = Integer.toString(counter);
        tableCell = new PdfPCell(new Phrase(str));
        tableCell.setBorderWidth(1);
        tableCell.setBorderColorTop(Color.blue);
        reportTable.addCell(tableCell);


        String title = rs.getString("title");
        tableCell = new PdfPCell(new Phrase(title));
        tableCell.setBorderWidth(1);
        tableCell.setBorderColorTop(Color.blue);
        reportTable.addCell(tableCell);

        Date startDate = rs.getDate("startdate");
        String date = df.format(startDate);
        tableCell = new PdfPCell(new Phrase(date));
        tableCell.setBorderWidth(1);
        tableCell.setBorderColorTop(Color.blue);
        reportTable.addCell(tableCell);

        Date deadlineDate = rs.getDate("deadlinedate");
        String date1 = df.format(deadlineDate);
        tableCell = new PdfPCell(new Phrase(date1));
        tableCell.setBorderWidth(1);
        tableCell.setBorderColorTop(Color.blue);
        reportTable.addCell(tableCell);

        counter++;
    }

    rs.close();
    stmt.close();
    conn.close();
    return reportTable;
}

[这是我的Servlet]

    private void report(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException, SQLException {

    try {

        Document pdfReport = new Document();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        PdfWriter.getInstance(pdfReport, baos);
        pdfReport.open();

        PdfPTable pdfTable = projectDaoImpl.reportGenerator();
        pdfReport.add(new PdfPTable(pdfTable));
        pdfReport.close();

        response.setHeader("Content-Disposition", "inline; filename=\"Report.pdf\"");
        response.setHeader("Expires", "0");
        response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
        response.setHeader("Pragma", "public");
        response.setContentType("application/pdf");
        response.setContentLength(baos.size());

        OutputStream os = response.getOutputStream();
        baos.writeTo(os);
        os.flush();
        os.close();

    } catch (Exception e) {
        // TODO: handle exception
    }
}

这是ajax

    $('#btnReport').click(function() {
    create();
});

function create(){

    $.ajax({
        type : "GET",
        url : "projects/report",
        contentType : "application/pdf",        
        complete : function(response) {
            if (response.status === 201) {
                alert("PDF Generated");
                window.location.reload();
            }
        }
});
}

SCREENSHOT OF AJAX RESPONSE