Develop Reference

Apache POI convert HTML/XHTML to DOC/DOCX

I need to transform HTML to a doc file, the HTML is filled with custom information and the images and CSS change depending on what is request.
I'm trying to use Apache POI for this, but I'm having an error
`
org.apache.poi.xwpf.converter.core.XWPFConverterException: java.lang.IllegalStateException: Expecting one Styles document part, but found 0
at org.apache.poi.xwpf.converter.xhtml.XHTMLConverter.convert(XHTMLConverter.java:72)
at org.apache.poi.xwpf.converter.xhtml.XHTMLConverter.doConvert(XHTMLConverter.java:58)
at org.apache.poi.xwpf.converter.xhtml.XHTMLConverter.doConvert(XHTMLConverter.java:38)
at org.apache.poi.xwpf.converter.core.AbstractXWPFConverter.convert(AbstractXWPFConverter.java:45)
My code is this:
// Load the HTML file
//Doc file
String htmlFile = "pathToHtml/file.html";
//String htmlFile = parseHTMLTemplate(disputeLetterDetails, template, fileExtension);
//new File(htmlFile);
//File file = new FileReader(htmlFile);
Path path = Path.of(htmlFile);
OutputStream in = new FileOutputStream(htmlFile, true);
// Create a new XWPFDocument
XWPFDocument document = new XWPFDocument();
// Set up the XHTML options
XHTMLOptions options = XHTMLOptions.create().URIResolver(new FileURIResolver(new File("./images/")));
options.setExtractor(new FileImageExtractor(new File("./images/")));
// Convert the HTML to XWPFDocument
XHTMLConverter.getInstance().convert(document, in, options);
// Save the document to a .doc file
FileOutputStream out = new FileOutputStream("pathToHtml/OUT_from_XHTML_TEST.docx");
document.write(out);
out.close();
`
I want to get a docx file from an HTML file with the same styles but I'm getting this error `
org.apache.poi.xwpf.converter.core.XWPFConverterException: java.lang.IllegalStateException: Expecting one Styles document part, but found 0
at org.apache.poi.xwpf.converter.xhtml.XHTMLConverter.convert(XHTMLConverter.java:72)
at org.apache.poi.xwpf.converter.xhtml.XHTMLConverter.doConvert(XHTMLConverter.java:58)
at org.apache.poi.xwpf.converter.xhtml.XHTMLConverter.doConvert(XHTMLConverter.java:38)
at org.apache.poi.xwpf.converter.core.AbstractXWPFConverter.convert(AbstractXWPFConverter.java:45)
`

Getting image from fb2 file in Java

I'm working now for e-book reader written in Java. Primary file type is fb2 which is XML-based type.
Images inside these books stored inside <binary> tags as a long text line (at least it looks like text in text editors).
How can I transform this text in actual pictures in Java? For working with XML I'm using JDOM2 library.
What I've tried does not produce valid pictures (jpeg files):
private void saveCover(Object book) {
// Necessary cast to process with book
Document doc = (Document) book;
// Document root and namespace
Element root = doc.getRootElement();
Namespace ns = root.getNamespace();
Element binaryEl = root.getChild("binary", ns);
String binaryText = binaryEl.getText();
File cover = new File(tempFolderPath + "cover.jpeg");
try (
FileOutputStream fileOut = new FileOutputStream(cover);
BufferedOutputStream bufferOut = new BufferedOutputStream(
fileOut);) {
bufferOut.write(binaryText.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}

The image content is specified as being base64 encoded (see: http://wiki.mobileread.com/wiki/FB2#Binary ).
As a consequence, you have to take the text from the binary element and decode it in to binary data (in Java 8 use: java.util.base64 and this method: http://docs.oracle.com/javase/8/docs/api/java/util/Base64.html#getDecoder-- )
If you take the binaryText value from your code, and feed it in to the decoder's decode() method you should get the right byte[] value for the image.

Javax DocumentBuilder produces “double-UTF-8’ed” charset encoding

I’ve got a Java DOM Document which MyFilter has rewritten. From logging output I know that the contents of the Document are still correct. I am using the following lines to convert theDocument to a List<String> to pass it back through an interface:
Transformer transformer = TransformerFactory.newInstance().newTransformer();
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
transformer.transform(new DOMSource(theDocument), new StreamResult(buffer));
return Arrays.asList(new String(buffer.toByteArray()).split("\r?\n"));
The filter is called from this file copying method using org.apache.commons.io.FileUtils:
List<String> lines = FileUtils.readLines(source, "UTF-8");
if (filters != null) {
for (final MyFilter filter : filters) {
lines = filter.filter(lines);
}
}
FileUtils.writeLines(destination, "UTF-8", lines);
This works perfectly fine on my machine (where I could debug it), but on other machines just running the code, reproducibly any non-ASCII characters get double-UTF-8’ed (e.g., Größe becomes Größe). The code is executed within a web app running in Tomcat. I am sure they are differently configured, but what I want is that I get the non-corrupt result on any configuration.
Any ideas what I could be missing?

When you have Document object created you have to read it Content.
After it you have to write it to file using LSSerializer interface, which DOM standart provides for this purpose.
By default, the LSSerializer produces an XML document without spaces or line
breaks. As a result, the output looks less pretty, but it is actually more suitable for parsing by another program because it is free from unnecessary white space.
If you want white space, you use yet another magic incantation after creating the serializer:
ser.getDomConfig().setParameter("format-pretty-print", true);
Code snippets looks like:
private String getContentFromDocument(Document doc) {
String content;
DOMImplementation impl = doc.getImplementation();
DOMImplementationLS implLS = (DOMImplementationLS) impl.getFeature("LS", "3.0");
LSSerializer ser = implLS.createLSSerializer();
ser.getDomConfig().setParameter("format-pretty-print", true);
content = ser.writeToString(doc);
return content;
}
And after you have string content you can write it to file, like:
public void writeToXmlFile(String xmlContent) {
File theDir = new File("./output");
if (!theDir.exists())
theDir.mkdir();
String fileName = "./output/" + this.getClass().getSimpleName() + "_"
+ Calendar.getInstance().getTimeInMillis() + ".xml";
try (OutputStream stream = new FileOutputStream(new File(fileName))) {
try (OutputStreamWriter out = new OutputStreamWriter(stream, StandardCharsets.UTF_8)) {
out.write(xmlContent);
out.write("\n");
}
} catch (IOException ex) {
System.err.println("Cannot write to file!" + ex.getMessage());
}
}
BTW:
Have you tried to get Document object at a little bit easier, like:
DocumentBuilderFactory documentFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = documentFactory.newDocumentBuilder();
Document doc = builder.parse(new File(fileName));
You can try this as well. It should be enough for parsing xml file.

I finally found it: The problem was within the String(byte[]) constructor which interprets byte[] relative to the platform’s default charset. This should at least have been tagged deprecated. The transformer obviously produces UTF-8 output independent of the platform. Changing the method like below passes the same charset to both:
final String ENCODING = "UTF-8";
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, ENCODING);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
transformer.transform(new DOMSource(theDocument), new StreamResult(buffer));
return Arrays.asList(new String(buffer.toByteArray(), ENCODING).split("\r?\n"));
To get it working, it does not really matter which encoding, just both should use the same. Hovever, it is good to choose some unicode charset as otherwise unmappable characters may get lost. However, the charset will be reflected in the XML declaration, thus when the List<String> gets saved later, it is important to save it accordigly.

how to create xml file in runtime?

I am trying to create an XML file at run-time under my web content folder, but a No such file or directory error was displayed.
My code:
Document document = DocumentHelper.createDocument();
Element rootElement = document.addElement("Students");
Element studentElement = rootElement.addElement("student").addAttribute("country", "USA");
studentElement.addElement("id").addText("1");
studentElement.addElement("name").addText("Peter");
XMLWriter writer = new XMLWriter(new FileWriter("/WebContent/Students.xml"));
//Note that You can format this XML document
/*
* FileWriter output = new FileWriter(new File("Students.xml"));
OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter writer = new XMLWriter(output,format);<- will fomat the output
*/
//You can print this to the console and see what it looks like
String xmlElement = document.asXML();
System.out.println(xmlElement);
writer.write(document);
writer.close();
I don't know how to do this. Can anyone help me to fix my code?

i got the answer i just change the path from /WebContent/Students.xml to
WebContent/Students.xml.
just remove the / before the WebContent

How to switch java code from using local XML file to URL of an XML file

I have written web application that reads an XMl file parses it and does some work.
Rather than using a local file, I'd like to use a URL of the XML file ( something like http://mydomain.com/daily-extract.xml )
This is what my code looks like:
private String xmlFile = "D:\\default-user\\WINXP\\Desktop\\extract-jan10d.xml";
SAXBuilder builder = new SAXBuilder("org.apache.xerces.parsers.SAXParser");
// Parse the specified file and convert it to a JDOM document
document = builder.build(new File(xmlFile));
Element root = document.getRootElement();
How can I switch from a file to a URL on the internet

Try to replace this line :
document = builder.build(new File(xmlFile));
By :
document = builder.build(new File(new URI("http://mydomain.com/daily-extract.xml")));