itext生成pdf文件

itext生成pdf文件
public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  Document document = new Document(PageSize.A4, 36,36,36,36);
  ByteArrayOutputStream ba = new ByteArrayOutputStream();
  try{
   PdfWriter writer = PdfWriter.getInstance(document, ba);
   document.open();
  
   //Sample1
//   document.add(new Paragraph("Hello World"));
//   document.add(new Paragraph("First page of the document."));
//   document.add(new Paragraph("Some more text on the first page with different color and font type.",
//   FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD, new Color(255, 150, 200))));
  
   //Sample2
   Paragraph title1 = new Paragraph("Chapter 1",
              FontFactory.getFont(FontFactory.HELVETICA, 18, Font.BOLDITALIC, new Color(0, 0, 255)));
   Chapter chapter1 = new Chapter(title1, 1);
   chapter1.setNumberDepth(0);
  
   Paragraph title11 = new Paragraph("This is Section 1 in Chapter 1",
              FontFactory.getFont(FontFactory.HELVETICA, 16,Font.BOLD, new Color(255, 0, 0)));
   Section section1 = chapter1.addSection(title11);
   Paragraph someSectionText = new Paragraph("This ext comes as part of section 1 of chapter 1.");
   section1.add(someSectionText);
   someSectionText = new Paragraph("Following is a 3 X 2 table.");
   section1.add(someSectionText);
  
   Table t = new Table(3,2);
   t.setBorderColor(new Color(220, 255, 100));
   t.setPadding(5);
   t.setSpacing(5);
   t.setBorderWidth(1);
   Cell c1 = new Cell("header1");
   c1.setHeader(true);
   t.addCell(c1);
   c1 = new Cell("Header2");
   t.addCell(c1);
   c1 = new Cell("Header3");
   t.addCell(c1);
   t.endHeaders();
   t.addCell("1.1");
   t.addCell("1.2");
   t.addCell("1.3");
   section1.add(t);
  
   List l = new List(true, false, 10);
   l.add(new ListItem("First item of list"));
   l.add(new ListItem("Second item of list"));
   section1.add(l);
  
   document.add(chapter1);

  }catch(DocumentException de){
   de.printStackTrace();
   System.err.println("A Document error:" +de.getMessage());
  }
  document.close();
  response.setContentType("application/pdf");
  

//添加下面一段，点击提示“另存为”，否则直接在浏览器中打开
  response.setHeader("Content-Disposition", "attachment;filename=\"HelloWord.pdf\"");  
  response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");  
  response.setHeader("Pragma", "public");  
  response.setDateHeader("Expires", (System.currentTimeMillis() + 1000));
 
  response.setContentLength(ba.size());
  ServletOutputStream out = response.getOutputStream();
  ba.writeTo(out);
  out.flush();
}

 

function getPDF()
{
document.location.href="servlet/GetPDF";
}