23. juni 2003 - 14:46Der er
8 kommentarer og 1 løsning
Skod SAXParser!!
Jeg kæmper for vildt med et monster xml-dokument, og bruger en SAXParser til det! Jeg har implmenteret en DefaultHandler, og det er den som giver mig problemer. Det er ligesom at metoden Characters(..) giver mig falske informationer.. Den er implementeret sådan, og det char-array den har swapper på når den kommer over 8000 char, og så smider den nogle af mine data væk.. Måske er fejlen min, for jeg har prøvet både xerces og den der ligger i org.xml, og begge giver mig falske data.. Nogen der kan se hvad jeg gør galt?
private StringBuffer element = new StringBuffer(); ... public void characters(char buf[], int offset, int len) throws SAXException { element.append(new String(buf, offset, len)); return; }
public void startElement( String namespaceURI, String localName, String rawName, Attributes atts) throws SAXException { ... element = new StringBuffer(); ... return; } public void endElement( String namespaceURI, String localName, String rawName) throws SAXException { // brug element.toString() return; } } class Element { private int nbr; private String name; private boolean include; public Element() { nbr = 0; name = null; include = false; } public Element(int nbr, String name, boolean include) { this.nbr = nbr; this.name = name; this.include = include; } public int getNbr() { return nbr; } public String getName() { return name; } public boolean isInclude() { return include; } public void setNbr(int nbr) { this.nbr = nbr; } public void setName(String name) { this.name = name; } public void setInclude(boolean b) { include = b; } public String toString() { return ("[" + nbr + "," + name + "," + include + "]"); } }
DefaultHandler overview og ContentHandler overview siger bare:
void characters(char[] ch, int start, int length) Receive notification of character data inside an element.
DefaultHandler details siger også kun:
public void characters(char[] ch, int start, int length) throws SAXException
Receive notification of character data inside an element.
By default, do nothing. Application writers may override this method to take specific actions for each chunk of character data (such as adding the data to a node or buffer, or printing it to a file).
Specified by: characters in interface ContentHandler
Parameters: ch - The characters. start - The start position in the character array. length - The number of characters to use from the character array. Throws: SAXException - Any SAX exception, possibly wrapping another exception. See Also: ContentHandler.characters(char[], int, int)
Først ContentHandler details siger:
public void characters(char[] ch, int start, int length) throws SAXException
Receive notification of character data.
The Parser will call this method to report each chunk of character data. SAX parsers may return all contiguous character data in a single chunk, or they may split it into several chunks; however, all of the characters in any single event must come from the same external entity so that the Locator provides useful information.
The application must not attempt to read from the array outside of the specified range.
Note that some parsers will report whitespace in element content using the ignorableWhitespace method rather than this one (validating parsers must do so).
Parameters: ch - The characters from the XML document. start - The start position in the array. length - The number of characters to read from the array. Throws: SAXException - Any SAX exception, possibly wrapping another exception. See Also: ignorableWhitespace(char[], int, int), Locator
og det er altså først der man får det at vide.
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