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我搜索了很多,但无法解决此问题。我正在用iText生成PDF文件。如果我使用FileOutputStream一切都很好,但是当我尝试使用ServletOutputStream时,图像不会出现在PDF文件中。ServletOutputStream PDF文件中的图像问题
当我用文本编辑器打开PDF文件时,我看到有“???”非常。这意味着有些东西正在削减字节。这就像试图在JSP中使用二进制文件。但我使用的是JSF,Tomcat 6.0,Spring 3.0和Richfaces。
下面是与ServletOutputStream的生成PDF,并导致问题
public static void saveChartToPDF(JFreeChart chart, String fileName, HttpServletResponse response) throws Exception { ByteArrayOutputStream baos = new ByteArrayOutputStream(); Document document = new Document(); document.addCreationDate(); document.setPageSize(PageSize.A4.rotate()); PdfWriter writer = PdfWriter.getInstance(document, baos); document.open(); PdfContentByte cb = writer.getDirectContent(); PdfTemplate tp = cb.createTemplate(300, 300); Graphics2D g2 = tp.createGraphics(300, 300, new DefaultFontMapper()); Rectangle2D r2D = new Rectangle2D.Double(0, 0, 300, 300); chart.draw(g2, r2D, null); g2.dispose(); cb.addTemplate(tp, 0, 0); document.close(); response.setContentType("application/pdf"); response.setHeader("Expires", "0"); response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0"); response.setHeader("Pragma", "public"); response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".pdf"); response.setContentLength(baos.size()); ServletOutputStream out = response.getOutputStream(); baos.writeTo(out); out.flush();
这里是代码工作正常FileOutputStream中()
public static void saveChartToPDF(JFreeChart chart, String fileName, HttpServletResponse response) throws Exception { Document document = new Document(); document.addCreationDate(); document.setPageSize(PageSize.A4.rotate()); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("c:/test1.pdf")); document.open(); PdfContentByte cb = writer.getDirectContent(); PdfTemplate tp = cb.createTemplate(300, 300); Graphics2D g2 = tp.createGraphics(300, 300, new DefaultFontMapper()); Rectangle2D r2D = new Rectangle2D.Double(0, 0, 300, 300); chart.draw(g2, r2D, null); g2.dispose(); cb.addTemplate(tp, 0, 0); document.close();
我找不到为什么字节作为代码剃光。
非常感谢你的帮助,
哦,是的!它运行良好。非常感谢,非常感谢。关闭部件时我应该更加小心。 – jiraiya 2010-12-23 06:30:28