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JSP: The Complete Reference
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throws SAXException { if (nameequals("product")) { product = new Product(); productsetCode(attrsgetValue("code")); } buffer = new StringBuffer(); } /** * Accumulates characters from text nodes */ public void characters(char[] ch, int start, int len) throws SAXException { bufferappend(ch, start, len); } /** * Called when an end tag is encountered */ public void endElement(String name) throws SAXException { String text = buffertoString()trim(); if (nameequals("price")) productsetPrice(DoubleparseDouble(text)); else if (nameequals("manufacturer")) productsetManufacturer(text); else if (nameequals("description")) productsetDescription(text); else if (nameequals("product")) { if (productgetManufacturer()equals("Clemens-Altman")) { try { String[] lines = { "<TR>", "<TD>", productgetCode(), "</TD>", "<TD>", productgetDescription(), "</TD>", "<TD ALIGN='RIGHT'>", fmtformat(productgetPrice()), "</TD>", "</TR>",
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}; for (int i = 0; i < lineslength; i++) outprintln(lines[i]); } catch (IOException e) { throw new SAXException(egetMessage()); } } } } } %>
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Like DOMBuilderFactory and DOMBuilder, SAXParserFactory and SAXParser can be invoked through JAXP:
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SAXParserFactory factory = SAXParserFactorynewInstance(); SAXParser parser = factorynewSAXParser();
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Remember, the SAX technique is to implement DocumentHandler (or extend HandlerBase) and provide callbacks for the parsing event methods of interest An inner class can be used to do that The JAXP parse() method registers our ProductParser class as the document handler, and then starts parsing:
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parserparse(is, new ProductParser(out));
The ProductParser class is interested in three events: I startElement At the beginning of a new <product> element, you need to create a Product object and store the code attribute in it I characters As text flies by, you accumulate it in a StringBuffer I endElement At the end of an element, you assign its value from the StringBuffer, if it s one of the product fields If this is the end of a <product> element, you can print the product in the HTML table, clear your buffers, and wait for the next product to be parsed The resulting HTML table is shown in Figure 16-2 Note the difference in elapsed time from the DOM version in Figure 16-1
JSP: The Complete Reference
Figure 16-2
Product catalog search using XML SAX 10 parser
SAX 20
An updated SAX specification was adopted in May 1998 The main improvement in SAX 20 is support for namespaces Namespaces are groups of tags with a common prefix that distinguishes them from other tags that may have the same name without the prefix This allows packages of XML tags to be defined without worrying about colliding with similarly named tags In API terms, SAX 20 deprecates the Parser, DocumentHandler, and AttributeList interfaces, replacing them with the namespace-aware XMLReader, ContentHandler, and Attributes interfaces, respectively
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JSP and XML
As you might expect, not all XML products have caught up to the latest DOM and SAX levels As of November 2000, JAXP doesn t yet support SAX 20, except in an early access package The Xerces-J 121 release supports SAX 20 by itself, but not through the Xerces version of JAXP, which is still only for SAX 10 Check the Sun, W3C, and xmlapacheorg Web sites for updated versions In SAX 20, our product catalog JSP page looks like this:
<%@ page session="false" %> <%@ page import="javaio*" %> <%@ page import="javanet*" %> <%@ page import="javatext*" %> <%@ page import="javautil*" %> <%@ page import="jspcrxmlsamples*" %> <%@ page import="orgxmlsax*" %> <%@ page import="orgxmlsaxhelpers*" %> <% long stime = SystemcurrentTimeMillis(); %> <HTML> <HEAD> <TITLE>(SAX 20) Clemens-Altman Musical Instruments</TITLE> </HEAD> <BODY> <CENTER> <H3>Clemens-Altman Musical Instruments</H3> <H4>(Powered by SAX 20)</H4> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0"> <TR> <TH>Product Code</TH> <TH>Description</TH> <TH>Price</TH> </TR> <% // Get a new SAX parser XMLReader parser = new orgapachexercesparsersSAXParser(); DefaultHandler handler = new ProductParser(out); parsersetContentHandler(handler); parsersetErrorHandler(handler); // Define the input source to be an XML document named
JSP IN ACTION
JSP: The Complete Reference
// "instrumentsxml" in the same directory as this JSP StringBuffer requestURL = HttpUtilsgetRequestURL(request); URL jspURL = new URL(requestURLtoString()); URL url = new URL(jspURL, "instrumentsxml"); InputSource is = new InputSource(urlopenStream()); // Parse the input source parserparse(is); %> </TABLE> <P> <% long etime = SystemcurrentTimeMillis(); double elapsed = (etime - stime)/10000; %> <EM>Elapsed time: <%= elapsed %> seconds</EM> </CENTER> </BODY> </HTML> <%! // Inner class that parses the XML input source class ProductParser extends DefaultHandler { private Product product; private StringBuffer buffer; private JspWriter out; private NumberFormat fmt; public ProductParser(JspWriter out) { thisout = out; buffer = new StringBuffer(); fmt = NumberFormatgetCurrencyInstance(); } /** * Called when a start tag is encountered */
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