Dynamic JSP page transfer PDF output to the page implementation method _jsp programming

Many problems have been encountered in the recent work. Sum up. The main function of this code is to forward a generated JSP page into a PDF output to the page

Need to use Itext

String html = Servletutils.forward (Request,response, "/web-inf/jsp/depot/print/jhd.jsp");
Forward request to JSP, return parsed content instead of output to browser//system.out.println (HTML);
byte[] PDF = pdfutils.html2pdf (HTML);
Response.setcontenttype ("Application/pdf");
Response.setheader ("Content-length", String.valueof (Pdf.length));
Response.setheader ("Connection", "keep-alive");
Response.setheader ("Accept-ranges", "none");
Response.setheader ("X-frame-options", "DENY");
OutputStream out = Response.getoutputstream ();
Out.write (PDF);
Out.flush (); public class Servletutils {/** * This forward method does not output content to the browser after execution, but instead outputs the output to a byte stream and finally returns as a string * @param request * @param response * @p 
Aram SRC * @return */public static string forward (HttpServletRequest request, httpservletresponse response, String src) { try{/*↓↓↓↓↓ reconstructs The response, modifies the output stream object in the response to the byte array ↓↓↓↓↓*/final Bytearrayoutputstream bytearrayoutputstream = new
Bytearrayoutputstream (); Final Servletoutputstream Servletouputstream = new Servletoutputstream () {@Override public void write (iNT B) throws IOException {bytearrayoutputstream.write (b);} @Override public boolean isready () {return false;} @Overrid
e public void Setwritelistener (Writelistener writelistener) {}};
Final PrintWriter printwriter = new PrintWriter (new OutputStreamWriter (Bytearrayoutputstream, "UTF-8")); Response = new Httpservletresponsewrapper (response) {public Servletoutputstream Getoutputstream () {return
Servletouputstream;
Public PrintWriter getwriter () {return printwriter;}}; /*↑↑↑↑↑↑ reconstructs The response, modifies the output stream object in the response, and outputs it to the byte array ↑↑↑↑↑↑*///performs forward operation Request.getrequestdispatcher (SRC). Forward
(Request,response);
Convert the contents of a byte stream too much into a string return new string (Bytearrayoutputstream.tobytearray (), "utf-8");
catch (Exception e) {throw new RuntimeException (e);}}
} Import com.itextpdf.text.*;
Import Com.itextpdf.text.pdf.PdfWriter;
Import Com.itextpdf.tool.xml.Pipeline;
Import Com.itextpdf.tool.xml.XMLWorker;
Import Com.itextpdf.tool.xml.XMLWorkerFontProvider; Import Com.itextpdf.tool.xml.XMLWorkerHelper;
Import com.itextpdf.tool.xml.exceptions.CssResolverException;
Import Com.itextpdf.tool.xml.html.CssAppliers;
Import Com.itextpdf.tool.xml.html.CssAppliersImpl;
Import Com.itextpdf.tool.xml.html.Tags;
Import Com.itextpdf.tool.xml.parser.XMLParser;
Import Com.itextpdf.tool.xml.pipeline.css.CSSResolver;
Import Com.itextpdf.tool.xml.pipeline.css.CssResolverPipeline;
Import Com.itextpdf.tool.xml.pipeline.end.PdfWriterPipeline;
Import Com.itextpdf.tool.xml.pipeline.html.HtmlPipeline;
Import Com.itextpdf.tool.xml.pipeline.html.HtmlPipelineContext;
Import java.io.*; /** * PDF Tool class/public class Pdfutils {/** * converts HTML to PDF, returns PDF file in byte array * @param HTML * @return PDF byte array * @throws IOEXCE ption * @throws documentexception * @throws cssresolverexception/public static byte[] Html2pdf (String html) throws Ioex
Ception, documentexception,cssresolverexception {Document document = new document (PAGESIZE.A4);
Bytearrayoutputstream OS = new Bytearrayoutputstream (); PDFWriter writer = Pdfwriter.getinstAnce (Document,os);
Document.open (); Xmlworkerfontprovider Fontprovider = new Xmlworkerfontprovider () {@Override public Font getfont (string fontname, String E ncoding, float size, int style) {return Super.getfont (FontName = null?)
"Song Body": FontName, encoding, size, style);
}
};
Fontprovider.addfontsubstitute ("Lowagie", "Garamond");
Fontprovider.setuseunicode (TRUE);
Use our font provider and set it to Unicode font style cssappliers cssappliers = new Cssappliersimpl (Fontprovider);
Htmlpipelinecontext htmlcontext = new Htmlpipelinecontext (cssappliers);
Htmlcontext.settagfactory (Tags.gethtmltagprocessorfactory ());
Cssresolver cssresolver = Xmlworkerhelper.getinstance (). Getdefaultcssresolver (True); pipeline<?> Pipeline = new Cssresolverpipeline (cssresolver,new htmlpipeline (Htmlcontext, New Pdfwriterpipeline (
Document,writer)));
Xmlworker worker = new Xmlworker (pipeline, true);
Xmlparser p = new Xmlparser (worker);
P.parse (New InputStreamReader (Html.getbytes ("GBK")));
Document.close (); REturn Os.tobytearray (); }
}

The above is a small set to introduce the dynamic JSP page to the PDF output to the page to achieve the method, I hope to help you, if you have any questions welcome to my message, small series will promptly reply to everyone!