Java中的 XSL 处理器

在Java中，XSLProcessor 是一个扩展Java.lang.Object类的类。它提供了创建 XSLStylesheet 对象和转换输入 XML 文档的方法。 XSL 代表可扩展样式表语言，它用于创建样式表，就像 CSS 一样，它描述了如何显示给定类型的 XML 文档。

--> java.lang Package
    --> Object Class
        --> XSL Processor Class extends Object Class  

XSLProcessor 类的方法

Methods	Description
getParam(java.lang.String name)	Uses getParam(String, String);
getParam(java.lang.String uri, java.lang.String name)	Gets the value of a top-level stylesheet parameter.
XSLStylesheet newXSLStylesheet(java.io.InputStream xsl)	Constructs an XSLStylesheet using the given Inputstream XSL function document(”) is not supported as there is no way to re-access the input Stylesheet as XMLDocument.
XSLStylesheet newXSLStylesheet(java.io.Reader xsl)	Constructs an XSLStylesheet using the given Reader XSL function document(”) is not supported as there is no way to re-access the input Stylesheet as XMLDocument.
newXSLStylesheet(java.net.URL xsl)	Constructs an XSLStylesheet using the given URL
newXSLStylesheet(XMLDocument xsl)	Constructs an XSLStylesheet using the given XMLDocument
processXSL(XSLStylesheet xsl, java.io.InputStream xml, java.net.URL ref)	Transforms the input XML document using given InputStream and stylesheet.
processXSL(XSLStylesheet xsl, java.io.Reader xml, java.net.URL ref)	Transforms the input XML document using given Reader and stylesheet.
processXSL(XSLStylesheet xsl, java.net.URL xml, java.net.URL ref)	Transforms the input XML document using given URL and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocument xml)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocument xml, ContentHandler handler)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocumentFragment inp)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocumentFragment xml, java.io.OutputStream os)	Transforms the input XML using given XMLDocumentFragment and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocumentFragment xml, java.io.PrintWriter pw)	Transforms the input XML using given XMLDocumentFragment and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocumentFragment inp, XMLDocumentHandler handler)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocument xml, java.io.OutputStream os)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocument xml, java.io.PrintWriter pw)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLDocument xml, XMLDocumentHandler handler)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLElement inp)	Transforms the input XML document using given XMLDocument and stylesheet.
processXSL(XSLStylesheet xsl, XMLElement inp, ContentHandler handler)	Transforms the input XML document using given XMLElement and stylesheet.
processXSL(XSLStylesheet xsl, XMLElement xml, java.io.OutputStream os)	Transforms the input XML using given XMLElement and stylesheet.
processXSL(XSLStylesheet xsl, XMLElement xml, java.io.PrintWriter pw)	Transforms the input XML using given XMLElement and stylesheet.
processXSL(XSLStylesheet xsl, XMLElement xml, XMLDocumentHandler handler)	Transforms the input XML document using given XMLElement and stylesheet.
removeParam(java.lang.String uri, java.lang.String name)	Removes the value of a top-level stylesheet parameter.
resetParams()	Resets all the params set.
setBaseURL(java.net.URL url)	Sets the base url to resolve include/import hrefs EntityResolver if set is used before using the base url.
setEntityResolver(EntityResolver eResolver)	Sets the entity resolver to resolve include/import hrefs if not set, base url (if set) is used.
setErrorStream(java.io.OutputStream out)	Generate an output stream for the output of warnings.
setLocale(java.util.Locale locale)	This method applications can use this to set the locale for error reporting.
setOutputEncoding(java.lang.String externalenc)	In this method if output encoding is not specified in XSL document, output charset as “UTF-8” in META element by default.
setParam(java.lang.String uri, java.lang.String name, java.lang.Object value)	Sets the value of a top-level stylesheet parameter.
setXSLTVersion(XSLProcessor.XSLTVersion version)	Sets the specification version to be used for transformation.
showWarnings(boolean flag)	Used when switching to determine whether to output warnings.

例子

Java

// Java Program to Illustrate XSLSample Class
 
// Class
public class XSLSample {
 
    // Main driver method
    public static void main(String args[]) throws Exception
    {
        if (args.length < 2) {
            System.err.println(
                "Usage: java XSLSample xslFile xmlFile.");
            System.exit(1);
        }
 
        // Creating a new XSLProcessor
        XSLProcessor processor = new XSLProcessor();
 
        // Register a base URL to resolve relative
        // references processor.setBaseURL(baseURL);
 
        // Or register an org.xml.sax.EntityResolver to
        // resolve relative references
        // processor.setEntityResolver(myEntityResolver);
 
        // Register an error log
        // processor.setErrorStream(new
        // FileOutputStream("error.log"));
 
        // Set any global parameters to the processor
        // processor.setParam(namespace, param1, value1);
        // processor.setParam(namespace, param2, value2);
 
        // resetParam is for multiple XML documents with
        // different parameters
 
        String xslFile = args[0];
        String xmlFile = args[1];
 
        // Create a XSLStylesheet
        //  The stylesheet can be created using one of
        //  following inputs:
        //
        // XMLDocument xslInput = /* using DOMParser; see
        // later in this code */ URL         xslInput = new
        // URL(xslFile); Reader      xslInput = new
        // FileReader(xslFile);
 
        InputStream xslInput = new FileInputStream(xslFile);
        XSLStylesheet stylesheet
            = processor.newXSLStylesheet(xslInput);
 
        // Prepare the XML instance document
        //   The XML instance can be given to the processor
        //   in one of
        // following ways:
        //
        // URL         xmlInput = new URL(xmlFile);
        // Reader      xmlInput = new FileReader(xmlFile);
        // InputStream xmlInput = new
        // FileInputStream(xmlFile); Or using DOMParser
 
        DOMParser parser = new DOMParser();
        parser.retainCDATASection(false);
        parser.setPreserveWhitespace(true);
        parser.parse(xmlFile);
        XMLDocument xmlInput = parser.getDocument();
 
        // Transform the XML instance
        //   The result of the transformation can be one of
        //   the following:
        //
        // 1. Return a XMLDocumentFragment
        // 2. Print the results to a OutputStream
        // 3. Report SAX Events to a ContentHandler
 
        // 1. Return a XMLDocumentFragment
        XMLDocumentFragment res;
        res = processor.processXSL(stylesheet, xmlInput);
 
        // Print the result to System.out
        res.print(System.out);
 
        // 2. Print the results to a OutputStream
        // processor.processXSL(stylesheet, xmlInput,
        // System.out);
 
        // 3. Report SAX Events to a ContentHandler
        // ContentHandler cntHandler = new
        // MyContentHandler();
        // processor.processXSL(stylesheet, xmlInput,
        // cntHandler);
 
        // Display message for successful execution
        System.out.println("Executed Successfully");
    }
}

输出：

Executed Successfully

XSL 还添加：

• 一种考虑 XML 文档的转换语言：XLST 代表可扩展样式表语言转换。最初，它旨在执行复杂的样式操作，例如创建目录和索引，现在它被用作通用 XML 处理语言。因此，除了 XSL 之外，XSLT 被广泛使用，例如从 XML 数据创建 HTML 网页。
• 最新的样式功能，由定义一组称为格式化对象的元素和属性的 XML 文档类型来说明。

用于Java的 XSLT 处理器：

Oracle 为Java、C、C++ 和 PL/SQL 提供 XSLT 处理。本文描述了用于Java的 XSLT 处理器。 XSLT 有两个版本，即 1.0 版本，以及目前正在开发的 2.0 版本，这是 W3C 互联网标准。 XSLT 也使用导航语言 XPath，并有相应的 1.0 和 2.0 版本。在Java中，XSLT 和 XPath 都由 XSLT 处理器实现。