最近工作中遇到不少问题。总结一下。这段代码主要功能是将一个生成JSP页面转发成PDF输出到页面
需要利用ITEXT
String html = ServletUtils.forward(request,response,"/WEB-INF/jsp/depot/print/jhd.jsp"); //转发请求到jsp，返回解析之后的内容而不是输出到浏览器 //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 { /** * 此forward方法执行完毕之后不会输出内容到浏览器，而是把输出到字节流，最后以字符串的形式返回 * @param request * @param response * @param src * @return */ public static String forward(HttpServletRequest request, HttpServletResponse response, String src) { try{ /* ↓↓↓↓↓重新构造response，修改response中的输出流对象，使其输出到字节数组↓↓↓↓↓ */ 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; } @Override 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; } }; /* ↑↑↑↑↑↑重新构造response，修改response中的输出流对象，使其输出到字节数组↑↑↑↑↑↑ */ //执行forward操作 request.getRequestDispatcher(src).forward(request,response); //把字节流中的内容太转为字符串 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工具类 */ public class PDFUtils { /** * 把html转换成pdf，以字节数组的形式返回pdf文件 * @param html * @return pdf字节数组 * @throws IOException * @throws DocumentException * @throws CssResolverException */ public static byte[] html2pdf(String html) throws IOException, 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 encoding, float size, int style) { return super.getFont(fontname == null " : fontname, encoding, size, style); } }; fontProvider.addFontSubstitute("lowagie", "garamond"); fontProvider.setUseUnicode(true); //使用我们的字体提供器，并将其设置为unicode字体样式 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(new ByteArrayInputStream(html.getBytes("gbk")))); document.close(); return os.toByteArray(); } }
以上所述是小编给大家介绍的动态jsp页面转PDF输出到页面的实现方法，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
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