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。
如果我通过绝对路径,如 D:/Deiva/CRs/HTMLPage/article-101-horz.jpg ,则会打印图像。但是,如果我尝试从服务器打印图像,如
http://localhost:8085/content/dam/article-101-h1.jpg or http://www.google.co.in/intl/en_ALL/images/logos/images_logo_lg.gif
然后它不会在PDF中打印出来。
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();
}
}
请建议以PDF格式显示图像的解决方案。
提前致谢。
德瓦玛丽娜
答案 0 :(得分:4)
我认为你可以使用Servlet轻松地查看图像。如何为此编写servlet是here
这里有一个示例调度员。只需根据需要编辑所需的地点
@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);
}
}
}
}
答案 1 :(得分:4)
以下是一些示例:https://developers.itextpdf.com/examples/xml-worker-itext5/html-images
htmlContext.setImageProvider(new AbstractImageProvider() {
public String getImageRootPath() { return "src/main/resources/html/"; }
});
如果您正在解析的HTML文件存储在与工作目录不同的目录中,则iText无法创建Image对象。我们必须提供ImageProvider接口的实现,该接口告诉iText如果遇到img标记该怎么做。该界面具有以下方法:
Image retrieve(final String src);
String getImageRootPath();
void store(String src, Image img);
void reset();
您可以编写自己的类来实现这四种方法,也可以创建AbstractImageProvider的子类。优选做后者。 XML Worker将使用AbstractImageProvider类的store()方法来缓存Map中遇到的所有Image对象。当为具有相同src的图像调用retrieve()方法时,将重用这些对象。如果您不缓存图像,您的PDF将会膨胀。相同的图像位和字节将不止一次写入PDF。 reset()方法清除缓存;在克隆ImageProvider时使用它。最后,没有实现getImageRootPath()方法。
如果您正在解析的HTML文件存储在与工作目录不同的目录中,则iText无法创建Image对象。我们必须提供ImageProvider接口的实现,该接口告诉iText如果遇到img标记该怎么做。该界面具有以下方法:
您可以编写自己的类来实现这四种方法,也可以创建AbstractImageProvider的子类。优选做后者。 XML Worker将使用AbstractImageProvider类的store()方法来缓存Map中遇到的所有Image对象。当为具有相同src的图像调用retrieve()方法时,将重用这些对象。如果您不缓存图像,您的PDF将会膨胀。相同的图像位和字节将不止一次写入PDF。 reset()方法清除缓存;在克隆ImageProvider时使用它。最后,没有实现getImageRootPath()方法。您必须自己实现它,如下面的代码片段所示:
答案 2 :(得分:3)
要使用Itext显示图像,您必须更改有关Image Provider的默认配置,如下所示: 我是从http://demo.itextsupport.com/xmlworker/itextdoc/flatsite.html
做的public class HtmlToPDF1 {
public static void main(String ... args ) throws DocumentException, IOException {
FontFactory.registerDirectories();
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document,
new FileOutputStream("src/test/ressources/mypdf.pdf"));
document.open(); HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
htmlContext.setImageProvider(new AbstractImageProvider() {
public String getImageRootPath() {
return "/home/fallphenix/workspace/JAVA/JEE/testHTMLtoPDF/src/test/ressources/";
}
}); 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 FileInputStream("src/test/ressources/other.html"));
document.close();
System.out.println("Done.");
}}
答案 3 :(得分:1)
尝试将图像放入内存或字节流对象,然后将该图像对象转换为itextsharp图像。
探索iTextSharp.text.Image
修改强>
虽然代码在C#中,但它可能对您有帮助。
从本地驱动器获取图像:
Bitmap image1;
image1 = new Bitmap(@"C:\Documents and Settings\All Users\"
+ @"Documents\My Music\music.jpeg", true);
注意::如果您的应用程序文件夹中有图像,那么我们就可以在C#中获取它们的本地文件路径。不了解Java。来自外部网站的图片可以下载为
System.Net.WebClient client = new WebClient();
client.DownloadFile(imageURL, localPathname); // look into java to get local path
现在将此字节流转换为图像对象
MemoryStream imgMemoryStream = new MemoryStream(imgByteArray);
Image myImage = Drawing.Image.FromStream(imgMemoryStream);
现在从中创建一个iTextSharp图像对象并将其添加到您的doucment中
iTextSharp.text.Image pic = iTextSharp.text.Image.GetInstance(myImage, System.Drawing.Imaging.ImageFormat.Jpeg);
document.Add(pic);
希望这会对你有所帮助。
答案 4 :(得分:1)
我也面临同样的问题..
但它正在使用图像绝对路径。它似乎不适用于远程路径。 这里的id是将图像保存在文件系统的临时位置并生成pdf,最后从临时位置删除图像文件。
<img src="/home/jboss/temp/imgs/img.png"/>