Implementation of converting dynamic jsp pages to PDF pages to pages, pdf to pages

Implementation of converting dynamic jsp pages to PDF pages to pages, pdf to pages

I have encountered many problems in my recent work. To sum up. The main function of this Code is to forward a generated JSP page to PDF and output it to the page.

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String html = ServletUtils. forward (request, response, "/WEB-INF/jsp/depot/print/jhd. jsp "); // forward the request to jsp, and return the parsed content instead of output to the browser // System. out. println (html); byte [] pdf = PDFUtils.html 2pdf (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-F Rame-Options "," DENY "); OutputStream out = response. getOutputStream (); out. write (pdf); out. flush (); public class ServletUtils {/*** after the forward method is executed, the content is not output to the browser, but to the byte stream, finally, return * @ param request * @ param response * @ param src * @ return */public static String forward (HttpServletRequest request, HttpServletResponse response, String src) as a String) {try {/* encode streams into bytes reconstructs response, modifies the output stream object in response, and outputs it to the byte array into bytes */final Byt EArrayOutputStream streams = new byteArrayOutputStream (); final ServletOutputStream servletOuputStream = new ServletOutputStream () {@ Overridepublic void write (int B) throws IOException {ByteArrayOutputStream. write (B) ;}@ Overridepublic boolean isReady () {return false ;}@ Overridepublic void setWriteListener (WriteListener writeListener) {}}; final PrintWriter printWriter = new PrintWriter (n Ew OutputStreamWriter (byteArrayOutputStream, "UTF-8"); response = new HttpServletResponseWrapper (response) {public ServletOutputStream getOutputStream () {return servletOuputStream;} public PrintWriter getWriter () {return printWriter ;}};/* rewrite response when response has failed to reconstruct response and modify the output stream object in response, make it output to the byte array bytes have been written into bytes * // execute the forward operation request. getRequestDispatcher (src ). forward (request, response); // convert the content in the 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.itext;.text=. using writer; 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; I Mport com.itext0000.tool.xml.html. cssAppliers; import com.itext;.tool.xml.html. cssAppliersImpl; import com.itext;.tool.xml.html. tags; import com. itextpdf. tool. xml. parser. XMLParser; import com.itext;.tool.xml.pipeline.css. CSSResolver; import com.itext;.tool.xml.pipeline.css. cssResolverPipeline; import com. itextpdf. tool. xml. pipeline. end. using writerpipeline; import com.itext;.tool.xml.pipeline.html. H TmlPipeline; import com.itext;.tool.xml.pipeline.html. htmlPipelineContext; import java. io. *;/*** pdf tool class */public class PDFUtils {/*** converts html to pdf, returns a pdf file * @ param html * @ return pdf byte array * @ throws IOException * @ throws define entexception * @ throws CssResolverException */public static byte [] html2pdf (String html) throws IOException, disable entexception, CssResolverException {Document document = new Doc Ument (PageSize. a4); ByteArrayOutputStream OS = new ByteArrayOutputStream (); bytes writer = bytes writer. getInstance (document, OS); document. open (); XMLWorkerFontProvider fontProvider = new XMLWorkerFontProvider () {@ Overridepublic Font getFont (String fontname, String encoding, float size, int style) {return super. getFont (fontname = null? "": Fontname, encoding, size, style) ;}}; fontProvider. addFontSubstitute ("lowagie", "garamond"); fontProvider. setUseUnicode (true); // use our font provider and set it to the unicode font style CssAppliers cssAppliers = new CssAppliersImpl (fontProvider); HtmlPipelineContext htmlContext = new HtmlPipelineContext (cssAppliers ); htmlContext. setTagFactory (Tags. getHtmlTagProcessorFactory (); CSSResolver cssResolver = XMLWorkerHelper. getIns Tance (). getDefaultCssResolver (true); Pipeline <?> Pipeline = new CssResolverPipeline (cssResolver, new HtmlPipeline (htmlContext, new javaswriterpipeline (document, writer); XMLWorker worker = new XMLWorker (pipeline, true ); XMLParser p = new XMLParser (worker); p. parse (new InputStreamReader (new ByteArrayInputStream (html. getBytes ("gbk"); document. close (); return OS. toByteArray ();}}

The above section describes how to convert a dynamic jsp page to a PDF page. I hope it will be helpful to you. If you have any questions, please leave a message, the editor will reply to you in time!