iText - HTML到PDF - 图像不以PDF格式显示 [英] iText – HTML to PDF - Image is not displayed in PDF
问题描述
我有一个带有文本，图像的html页面，我正在将HTML内容解析为iText以生成PDF。在生成的PDF中，未显示包含的图像，仅显示文本。
I have a html page with text, image and I am parsing the HTML content to iText to generate the PDF. In the generated PDF,Included images are not getting displayed and , only the text is getting displayed.
如果我通过绝对路径，如 D：/Deiva/CRs/HTMLPage/article-101-horz.jpg 那么图像将会显示打印。但是，如果我尝试从服务器打印图像，如
If I pass the absolute path like D:/Deiva/CRs/HTMLPage/article-101-horz.jpg then the image will get printed. But if I try to print the image from the server like
http：// localhost：8085 / content / dam / article-101-h1 .jpg或http://www.google.co.in/intl/en_ALL/images/logos/images_logo_lg.gif
然后它没有打印在PDF中。
then it is not getting printed in the PDF.
注意：我正在使用 itextpdf-5.2.1.jar 来生成PDF。
NOTE: I am using itextpdf-5.2.1.jar to generate the PDF.
我的HTML代码（Article.html）：
<html>
<head>
</head>
<body>
<p>Generate PDF with image using iText.</p>
<img src="http://localhost:8085/content/dam/article-10-h1.jpg"></img>
<img src="http://www.google.co.in/intl/en_ALL/images/logos/imgs_logo_lg.gif"></img>
<img class="right horz" src="D:/Deiva/CRs/HTMLPage/article-101-horz.jpg"></img>
</body>
</html>
我使用以下java代码生成PDF：
private void createPDF (){
String path = "D:/Deiva/Test.pdf";
PdfWriter pdfWriter = null;
//create a new document
Document document = new Document();
try {
//get Instance of the PDFWriter
pdfWriter = PdfWriter.getInstance(document, new FileOutputStream(path));
//document header attributes
document.addAuthor("betterThanZero");
document.addCreationDate();
document.addProducer();
document.addCreator("MySampleCode.com");
document.addTitle("Demo for iText XMLWorker");
document.setPageSize(PageSize.LETTER);
//open document
document.open();
InputStream is = new FileInputStream("D:/Deiva/CRs/Oncology/Phase5/CR1/HTMLPage/Article.html");
// create new input stream reader
InputStreamReader isr = new InputStreamReader(is);
//get the XMLWorkerHelper Instance
XMLWorkerHelper worker = XMLWorkerHelper.getInstance();
//convert to PDF
worker.parseXHtml(pdfWriter, document, isr);
//close the document
document.close();
//close the writer
pdfWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
}
请建议一个解决方案来显示PDF中的图像。
Please suggest a solution to display the image in PDF.
提前致谢。
Deiva
推荐答案
我认为您可以使用Servlet轻松查看图像。如何为此编写servlet是此处
I think you can do it easily using a Servlet for viewing the image. How to write a servlet for this is here
这里有一个样本调度员。只需根据需要编辑所需的位置
Here a sample dispatcher for you. Just edit the required places as needed
@Controller
public class ImageController extends DispatcherServlet {
private static final int DEFAULT_BUFFER_SIZE = 10240; // 10KB.
// Properties ---------------------------------------------------------------------------------
private String imagePath;
@RequestMapping(value="images/{imageId:.+}", method = RequestMethod.GET)
public @ResponseBody void getImage(@PathVariable String imageId,HttpServletRequest request, HttpServletResponse response){
String requestedImage = request.getPathInfo();
this.imagePath ="image path in server here";
if (requestedImage == null) {
// Do your thing if the image is not supplied to the request URI.
// Throw an exception, or send 404, or show default/warning image, or just ignore it.
try {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}catch(IOException ioException){
logger.error("error image path incorrect:{}", ioException);
} // 404.
return;
}
File image=null;
try {
image = new File(imagePath, URLDecoder.decode(imageId, "UTF-8"));
} catch (UnsupportedEncodingException unsupportedEncodingException) {
logger.error("error image can not decode:{}", unsupportedEncodingException);
}
// Check if file actually exists in filesystem.
if (!image.exists()) {
// Do your thing if the file appears to be non-existing.
// Throw an exception, or send 404, or show default/warning image, or just ignore it.
try {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}catch(IOException ioException){
logger.error("error image does not exists:{}", ioException);
} // 404.
return;
}
// Get content type by filename.
String contentType = "jpeg";
contentType="image/"+contentType;
// Init servlet response.
response.reset();
response.setBufferSize(DEFAULT_BUFFER_SIZE);
response.setContentType(contentType);
response.setHeader("Content-Length", String.valueOf(image.length()));
response.setHeader("Content-Disposition", "inline; filename=\"" + image.getName() + "\"");
// Prepare streams.
BufferedInputStream input = null;
BufferedOutputStream output = null;
try {
// Open streams.
try {
input = new BufferedInputStream(new FileInputStream(image), DEFAULT_BUFFER_SIZE);
} catch (FileNotFoundException e) {
logger.error("error creating file input stream to the image file :{}", e);
}
try {
output = new BufferedOutputStream(response.getOutputStream(), DEFAULT_BUFFER_SIZE);
} catch (IOException e) {
logger.error("error creating output stream to the http response :{}", e);
}
// Write file contents to response.
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int length;
try {
while ((length = input.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
} catch (IOException e) {
logger.error("error writing the image file to outputstream :{}", e);
}
} finally {
// Gently close streams.
close(output);
close(input);
}
}
// Helpers (can be refactored to public utility class) ----------------------------------------
private void close(Closeable resource) {
if (resource != null) {
try {
resource.close();
} catch (IOException e) {
// Do your thing with the exception. Print it, log it or mail it.
logger.error("error closing resources:{}", e);
}
}
}
}
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