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POHow to output JTextPane styled contents to HTML, including custom style?
 

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  1. POHow to output JTextPane styled contents to HTML, including custom style?
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    <p>I currently use a JTextPane to allow users to add/edit text. It allows bold/italic/underline (and I plan to allow links in the future). It also allows users to drop buttons in, which are inserted as custom styles. The panel looks like:</p> <p><strong><em>&lt; &lt; image deleted > ></em></strong></p> <p>I would like to be able to save/load content as HTML - the content will be incorporated in a Flash swf. I am able to get content as HTML like so:</p> <pre><code> public String getHTMLText(){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); try{ HTMLEditorKit hk = new HTMLEditorKit(); hk.write(baos, this.getStyledDocument(), 0, this.getDocument().getLength()); } catch (IOException e) { e.printStackTrace(); } catch (BadLocationException e) { e.printStackTrace(); } return baos.toString(); } </code></pre> <p>This works fine if the JTextPane includes only bold/italic/underlined text. The output is overly complicated though. I want to be able to output my custom style as well, but when I try I'm getting this error:</p> <pre><code> Exception occurred during event dispatching: java.lang.NullPointerException at javax.swing.text.html.MinimalHTMLWriter.writeAttributes(MinimalHTMLWriter.java:151) at javax.swing.text.html.MinimalHTMLWriter.writeStyles(MinimalHTMLWriter.java:256) at javax.swing.text.html.MinimalHTMLWriter.writeHeader(MinimalHTMLWriter.java:220) at javax.swing.text.html.MinimalHTMLWriter.write(MinimalHTMLWriter.java:122) at javax.swing.text.html.HTMLEditorKit.write(HTMLEditorKit.java:293) at javax.swing.text.DefaultEditorKit.write(DefaultEditorKit.java:152) at numeracy.referencetextpanel.NRefButtonTextArea.getHTMLText(NRefButtonTextArea.java:328) at numeracy.referencetextpanel.NInputPanelRefTextButton.getReferencedText(NInputPanelRefTextButton.java:59) at numeracy.referencetextpanel.NInputRefText.actionPerformed(NInputRefText.java:106) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) </code></pre> <p>My custom style is inserted like so (cID is a string like "{0-0}"):</p> <pre><code>StyledDocument doc = this.getStyledDocument(); NRefButton b = this.createRefButton(cID); Style style = doc.addStyle(cID, null); //prepare a style StyleConstants.setComponent(style, b); doc.insertString(doc.getLength(), b.toString(), style); //insert button at index </code></pre> <p>The function createRefButton(String cID):</p> <pre><code> private NRefButton createRefButton(String cID) { NRefButton b = new NRefButton(_equationButtons.get(cID).getText(), cID, _equationButtons.get(cID).isStruck()); //prepare a button return b; } </code></pre> <p>NRefButton overrides toString, which returns "{"+cID+"}".</p> <p>What I would like to know: should I modify the way I insert the "Style" to get this error? </p> <p>Is there a different/better way for me to get HTML from this JTextPane? All I want is HTML tags around bold/italic/underlined text, not overly complicated as if it is I'll then have to strip out the unnecessary HTML, and for the "style" to come out as button.toString(). </p> <p>Or should I implement my own toHTML() method, wrapping bold/italic/underlined text with the required tags? I don't mind doing this (in some ways I'd prefer it), but I don't know how to get the styles for the given JTextPane document. I suppose if I were able to get these styles, I could iterate through them, wrapping styled text in the appropriate tags?</p> <p>Ideally, the pictured JTextPane content would be output as:</p> <pre><code>&lt;html&gt;&lt;p&gt;This is some &lt;b&gt;styled&lt;/b&gt; text. It is &lt;u&gt;incredible&lt;/u&gt;. &lt;br/&gt; &lt;br/&gt; Here we have a button that has been dropped in: {0-0}. These buttons are a &lt;b&gt;&lt;i&gt;required part of this project.&lt;/i&gt;&lt;/b&gt; </code></pre> <p>I want to be able to <em>read</em> the output HTML <em>into</em> the JTextPane as well - again I don't mind writing my own fromHTML() method for this, but I need to be able to get HTML out first.</p> <p>Thank you for taking the time to read my question.</p>
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    1. USMichael Robinson
    1. USMichael Robinson
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      1. POHow to output JTextPane styled contents to HTML, including custom style?
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    1. COI don't know the answer to your question, but please replace that custom OutputStream with the highest voted answer to the referenced question, i.e. use ByteArrayOutputStream.
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      1. POHow to output JTextPane styled contents to HTML, including custom style?
      1. USDave Ray
    2. CODone, thanks Dave.
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      1. USMichael Robinson
 

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