我有一个包含文本、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，不显示包含的图像，只显示文本。
如果我传递像 D:/Deiva/CRs/HTMLPage/article-101-horz.jpg 这样的绝对路径，那么图像就会被打印出来。但是如果我尝试像
这样从服务器打印图像http://localhost:8085/content/dam/article-101-h1.jpg 或 http://www.google.co.in/intl/en_ALL/images/logos/images_logo_lg.gif
那么它不会打印在 PDF 中。
注意:我正在使用 itextpdf-5.2.1.jar 生成 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>
我正在使用以下 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();
}
}
请提出一个以 PDF 格式显示图像的解决方案。
提前致谢。
天神
最佳答案
我认为您可以使用用于查看图像的 Servlet 轻松完成此操作。如何为此编写 servlet here
这里有一个调度程序示例。只需根据需要编辑需要的地方
@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);
}
}
}
}
关于java - iText – HTML 到 PDF - 图像不显示在 PDF 中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15273933/