如何显示弹出的pdf文件，而不是保存内部使用java

我使用iText jar导出pdf格式的内容。我使用FileOutputStream将文件存储在我的本地(如D:/filename.pdf)。而不是这样做，我需要显示弹出对话框出现，并要求保存pdf选项。如何实现呢?

Here is my code.
JSP:
<%@ page language="java" 
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Export to Excel - Demo</title>
<!-- Jquery script -->
<script src="scripts.js"></script>
<script language="javascript"> 
function ExportToPDF()
{
    $('#myForm').submit();      
}
</script>
</head>
<body>
  <form id="myForm" action="Sample" method="post">
    <br><br>
    <p>
    some text
    </p>
    <a href="" onclick="ExportToPDF();" target="_blank">Export to Excel</a>
   </form>
</body>
</html>

Servlet:

import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.itextpdf.text.Document;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;

/**
 * Servlet implementation class Sample
 */
public class Sample extends HttpServlet {
    private static final long serialVersionUID = 1L;
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Sample() {
        super();
        // TODO Auto-generated constructor stub
    }
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        System.out.println("Inside doGet");
    }
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        System.out.println("Inside doPost");
        try {
            actionExportToPDF(request, response);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
  public void actionExportToPDF(HttpServletRequest request, HttpServletResponse response) throws Exception
  {
      /* Create Connection objects */
      Class.forName ("oracle.jdbc.OracleDriver"); 
      Connection conn=DriverManager.getConnection(
            "jdbc:oracle:thin:@localhost:1521:XID","username","password");
      Statement stmt = conn.createStatement();
      System.out.println(conn);
      /* Define the SQL query */
      ResultSet query_set = stmt.executeQuery("SELECT first_name,last_name,email,phone,dob,squestion FROM signup");
      /* Step-2: Initialize PDF documents - logical objects */
      Document my_pdf_report = new Document();
      PdfWriter.getInstance(my_pdf_report, new FileOutputStream("D:/pdf_report_from_sql_using_java.pdf"));
      my_pdf_report.open();            
      //we have four columns in our table
      PdfPTable my_report_table = new PdfPTable(4);
      //create a cell object
      PdfPCell table_cell;
      while (query_set.next()) {                
                      String first_id = query_set.getString("first_name");
                      table_cell=new PdfPCell(new Phrase(first_id));
                      my_report_table.addCell(table_cell);
                      String last_name=query_set.getString("last_name");
                      table_cell=new PdfPCell(new Phrase(last_name));
                      my_report_table.addCell(table_cell);
                      String email_id=query_set.getString("email");
                      table_cell=new PdfPCell(new Phrase(email_id));
                      my_report_table.addCell(table_cell);
                      String phone_id=query_set.getString("phone");
                      table_cell=new PdfPCell(new Phrase(phone_id));
                      my_report_table.addCell(table_cell);
                      String dob_id=query_set.getString("dob");
                      table_cell=new PdfPCell(new Phrase(dob_id));
                      my_report_table.addCell(table_cell);
                      String squestion_id=query_set.getString("squestion");
                      table_cell=new PdfPCell(new Phrase(squestion_id));
                      my_report_table.addCell(table_cell);
                      }
      /* Attach report table to PDF */
      my_pdf_report.add(my_report_table);                       
      my_pdf_report.close();
      /* Close all DB related objects */
      query_set.close();
      stmt.close(); 
      conn.close();     

  }
}

使用jar:

itextpdf-5.2.0.jar

itextpdf-5.2.0-javadoc.jar

itextpdf-5.2.0-sources.jar

itext-xtra-5.2.0.jar

itext-xtra-5.2.0-javadoc.jar

itext-xtra-5.2.0-sources.jar

ojdbc14-10g.jar

PdfWriter可以向任意OutputStream写入PDF。如果要创建Servlet，不应该将PDF写入FileOutputStream，而应该写入ServletOutputStream。请查看官方文档中的PdfServlet示例。在这个例子中，我们将PDF写入内存(使用ByteArrayOutputStream)，一旦我们关闭文档，我们将其写入ServletOutputStream: OutputStream os = response.getOutputStream(); baos.writeTo(os);有非常具体的原因，为什么你想要首先在内存中创建文档，并在文档完全完成后将其写入ServletOutputStream，但它会导致我们太远，无法解释所有这些原因(它们在我的书的第9章中列出，解释需要几页)。
默认情况下，内容处置为内联。这意味着PDF是在浏览器插件中打开的。如果您希望浏览器显示"另存为"对话框，您需要将内容配置更改为附件。这在CreateFDF示例中显示:response.setHeader("Content-Disposition", "attachment; filename="subscribe.fdf"");在这种情况下，我们还给出了文件名的建议。该文件的默认名称为subscribe.fdf。

警告:浏览器的行为可以是不同的，例如，由于特定的浏览器功能，使浏览器忽略响应头。

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