有谁用Xalan编译过XSL吗？

[wangwenyou]

Xalan的XSLTC.compile可将XSL编译为class，本意上是为了提高效率；
可我看了它的调用与实现，好象只支持物理存储的XML。调用时必须DOMImpl dom = new DOMImpl()或从cache中retrieve，好丑陋的接口！
我的XML一般来源于内存字符串，如果来一次磁盘IO，然后再用Class.forName，理论上效率更低。

请问哪位使用过Xalan的这个功能，效率如何？有变通的方法可绕开磁盘IO吗？先谢谢了

[jouny0]

up

[tpz_stamp]

如果仅仅要将xsl文件编译为class，可以使用xmlc。不十分理解你的问题。
将xsl编译后，如何使用？？？

[tpz_stamp]

难道是避开读取xsl文件，直接load相关的class做transform？
那怎么transform？

[wangwenyou]

一般的处理步骤是这样的：
1、将一个XSL文件编译为一个class文件，例如xsl编译后className为com.isee.sample.Test;
2、进行XSLT时，通常代码如下：
Class tc = Class.forName(className);
AbstractTranslet translet = (AbstractTranslet)tc.newInstance();
...
DOMImpl dom = new DOMImpl(uri);// uri为XML的来源，可为filename，也可为URL
translet.transform(dom, ...);

关键问题就出在这，dom必须从物理存储介质读取，要满足它的要求，内存中的XML字符串就必须进行一次IO。

[wangwenyou]

加100分，如无答复，只好结了：（

[hk2000c]

你可以使用Jdom（以下Document类是在jdom中定义的）
DOMBuilder builder = new DOMBuilder();
Document doc = builder.build(url);
使用如下函数对你的数据源转换：
public static List transform(Document in, String stylesheet)
throws JDOMException {
try {
Transformer transformer = TransformerFactory.newInstance()
.newTransformer(new StreamSource(stylesheet));
JDOMResult out = new JDOMResult();
transformer.transform(new JDOMSource(in), out);
return out.getResult();
}
catch (TransformerException e) {
throw new JDOMException("XSLT Trandformation failed", e);
}
}

[hk2000c]

上面你应该使用以下语句效率会快些。
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(url);


============以上类除Transformer均在Jdom中定义，不是org.w3c.dom中的。

[Debian]

DOM不是将xml文档一次性读入内存的吗？

[Debian]

DOM不是将xml文档一次性读入内存的吗？

[Debian]

DOM不是将xml文档一次性读入内存的吗？

[hk2000c]

修改后为这样：最后如果你需要使用w3c的Document需要转换一下。
public static Document transform(Document in, String stylesheet，String url)
throws JDOMException {
try {
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(url);
Transformer transformer = TransformerFactory.newInstance()
.newTransformer(new StreamSource(stylesheet));
JDOMResult out = new JDOMResult();
transformer.transform(new JDOMSource(in), out);
return out.getDeocument();
}
catch (TransformerException e) {
throw new JDOMException("XSLT Trandformation failed", e);
}
}

[hk2000c]

上有误
public static Document transform(String stylesheet，String url)
throws JDOMException {
try {
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(url);
Transformer transformer = TransformerFactory.newInstance()
.newTransformer(new StreamSource(stylesheet));
JDOMResult out = new JDOMResult();
transformer.transform(new JDOMSource(in), out);
return out.getDeocument();
}
catch (TransformerException e) {
throw new JDOMException("XSLT Trandformation failed", e);
}
}

这样就可以了。

[hk2000c]

上有误
public static Document transform(String stylesheet，String url)
throws JDOMException {
try {
SAXBuilder builder = new SAXBuilder();
Document in = builder.build(url);
Transformer transformer = TransformerFactory.newInstance()
.newTransformer(new StreamSource(stylesheet));
JDOMResult out = new JDOMResult();
transformer.transform(new JDOMSource(in), out);
return out.getDeocument();
}
catch (TransformerException e) {
throw new JDOMException("XSLT Trandformation failed", e);
}
}

[wangwenyou]

对不起，我不是想知道如何使用JAXP或JDOM的XSLT；我关心的是将XSL编译为class文件。
谢谢了

[hk2000c]

看了第二遍，明白你意思了。
你所说的org.apache.xalan.xsltc.compiler.XSLTC
有很多种形式，你随便挑种就可以了，谁说只能从物理文件读取Document的？apache不会作出那么傻得类的。
boolean compile(InputSource input, java.lang.String name)
Compiles an XSL stylesheet passed in through an InputStream
boolean compile(java.io.InputStream stream, java.lang.String name)
Compiles an XSL stylesheet passed in through an InputStream
byte[][] compile(java.lang.String name, InputSource input)
Compiles a stylesheet pointed to by a URL.
byte[][] compile(java.lang.String name, InputSource input, int outputType)
Compiles a stylesheet pointed to by a URL.
boolean compile(java.net.URL url)
Compiles an XSL stylesheet pointed to by a URL
boolean compile(java.net.URL url, java.lang.String name)
Compiles an XSL stylesheet pointed to by a URL
boolean compile(java.util.Vector stylesheets)
Compiles a set of stylesheets pointed to by a Vector of URLs
==========================
就拿这条把
compile
public boolean compile(java.io.InputStream stream,
java.lang.String name)Compiles an XSL stylesheet passed in through an InputStream
Parameters:
input - An InputStream that will pass in the stylesheet contents
name - The name of the translet class to generate
Returns:
'true' if the compilation was successful
我想InputStream不必是一定是物理文件吧。
上面的文件再改一下！

public static void transformAndCompile(String stylesheet，String url,String className)
throws JDOMException {
try {
SAXBuilder builder = new SAXBuilder();
Document in = builder.build(url);
Transformer transformer = TransformerFactory.newInstance()
.newTransformer(new StreamSource(stylesheet));
JDOMResult out = new JDOMResult();
transformer.transform(new JDOMSource(in), out);
Document trasformed = out.getDeocument();
XMLOutputter xmlOutputter = new XMLOutputter();
// Output to the I/O stream
InputStream resultIn = new InputStream();
OutputStream resultOut = new OutputStream(resultIn);
xmlOutputter.output(trasformed , sourceOut);
org.apache.xalan.xsltc.compiler.XSLTC xsltc = new org.apache.xalan.xsltc.compiler.XSLTC ();
xsltc.compile(resultIn,className);
}
catch (TransformerException e) {
throw new JDOMException("XSLT Trandformation failed", e);
}
catch(XXXExeption...){..}
}


大致是这样吧，你再试试。

[wangwenyou]

大哥，您还是没看明白我的意思。编译我会！我要的是基于已编译的XSL进行XSLT！@