itext实现html转换成pdf （将带分页execl的html转换成pdf)

 1.首先下载itext2.08,iTextAsian(亚洲国际化包支持pdf中显示中文），core-Renderer(解析xhtml转换成pdf支持包），jtidy(html转换成xhtml支持包).其中core-Renderer包必须配合itext2.08版本的包，否则会抛出没有是public int[] getCharBBox(char c) 方法异常。

 

2.使用HttpURLConnection类发送一个post 请求。并利用HttpURLConnection中getInputStream方法获取生成的html的流。

３.利用jtidy将html流转换成xhtml流。并将xhtml流生成xhtml的document文档，最后利用ITextRenderer解析xhtml的document文档生成pdf的OutPutStream流生成pdf.

 注意:如果网页html的栏位太多,使网页html转换成pdf只会显示一半,这样就必须将字体变小

 如将上面字体12px改成11px或更小就可以:

 style.setTextContent("body { font-family: SimHei;font-size:11px;}");

 

4.通过拦截器获html并将html转换成excel和pdf

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
   ServletException {
  String queryString = ((HttpServletRequest) request).getQueryString();
  String uri = ((HttpServletRequest) request).getRequestURI();
  if (queryString == null) {
   chain.doFilter(request, response);
   return;
  }
  response.setCharacterEncoding("UTF-8");

  WapperedResponse wrapper = new WapperedResponse((HttpServletResponse) response);
  chain.doFilter(request, wrapper);
  byte[] excelBytes = wrapper.getResponseData();
  ByteArrayInputStream bis = new ByteArrayInputStream(excelBytes);
  java.io.BufferedOutputStream bos = null;
  HttpServletResponse httpResp = (HttpServletResponse) response;
  httpResp.reset();
  if (!p.matcher(queryString).find()) {
   response.setCharacterEncoding("UTF-8");
   httpResp.setHeader("Pragma", "no-cache");
   httpResp.setHeader("Cache-Control", "no-cache");
   httpResp.setDateHeader("Expires", 0);
   httpResp.setContentType("application/vnd.ms-excel");
   httpResp.setHeader("Content-disposition", "attachment; filename="
     + encodingFileName(getFileName(uri).replaceAll(".pdf", ".xls")));
   String filePath = ApplicationSetting.getProperty("save_report_excelTemp");
   if (!new File(filePath).exists())
    new File(filePath).mkdirs();
   String htmlName = filePath + UUID.randomUUID().toString().replace("-", "") + ".html";
   String excelName = filePath + UUID.randomUUID().toString().replace("-", "") + ".xls";
   FileOutputStream stream = new FileOutputStream(new File(htmlName));
   stream.write(excelBytes);
   stream.close();
   stream = null;
   bis = null;
   excelBytes = null;
   System.gc();
   try {
    htmlToExcel(htmlName, excelName);// 一般耗時在打開html檔上
   } catch (Exception e) {
    e.printStackTrace();
   } finally {
    if (new File(htmlName).exists())
     new File(htmlName).delete();
   }
   FileInputStream inStream = new FileInputStream(new File(excelName));
   byte[] content = new byte[1000];
   while (inStream.read(content) != -1) {
    response.getOutputStream().write(content);
   }
   if (inStream != null)
    inStream.close();
   if (response.getOutputStream() != null)
    response.getOutputStream().close();
   if (new File(excelName).exists())
    new File(excelName).delete();
  } else {
   httpResp.setHeader("Content-Disposition", " attachment; filename=\"my.pdf\"");
   httpResp.setHeader("Expires", "0");
   httpResp.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
   httpResp.setHeader("Pragma", "public");
   String fileName = getFileName(uri);
   try {
    OutputStream ou = response.getOutputStream();
    bos = new java.io.BufferedOutputStream(ou);
    httpResp.setContentType("application/pdf");
    httpResp.setHeader("Content-disposition", "attachment; filename=" + encodingFileName(fileName));
    String pdfFontSize = ((HttpServletRequest) request).getParameter("pdfFontSize");
    PdfRender.html2pdf(bis, "utf-8", pdfFontSize).writeTo(bos);
   } catch (Exception e) {
    e.printStackTrace();
   }
  }

 }

4.部分参考资料网址

http://www.iteye.com/topic/509417?page=6

http://today.java.net/pub/a/today/2007/06/26/generating-pdfs-with-flying-saucer-and-itext.html

http://blog.csdn.net/zdtwyjp/archive/2010/07/27/5769353.aspx