/*
* $Id: XSLTResult.java 484626 2006-12-08 15:02:24Z ddewolf $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.struts2.views.xslt;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Source;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.URIResolver;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.StrutsConstants;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.Result;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.TextParseUtil;
import com.opensymphony.xwork2.util.ValueStack;
/**
* <!-- START SNIPPET: description -->
*
* XSLTResult uses XSLT to transform action object to XML. Recent version has
* been specifically modified to deal with Xalan flaws. When using Xalan you may
* notice that even though you have very minimal stylesheet like this one
* <pre>
* <xsl:template match="/result">
* <result />
* </xsl:template></pre>
*
* <p>
* then Xalan would still iterate through every property of your action and it's
* all descendants.
* </p>
*
* <p>
* If you had double-linked objects then Xalan would work forever analysing
* infinite object tree. Even if your stylesheet was not constructed to process
* them all. It's becouse current Xalan eagerly and extensively converts
* everything to it's internal DTM model before further processing.
* </p>
*
* <p>
* Thet's why there's a loop eliminator added that works by indexing every
* object-property combination during processing. If it notices that some
* object's property were already walked through, it doesn't get any deeper.
* Say, you have two objects x and y with the following properties set
* (pseudocode):
* </p>
* <pre>
* x.y = y;
* and
* y.x = x;
* action.x=x;</pre>
*
* <p>
* Due to that modification the resulting XML document based on x would be:
* </p>
*
* <pre>
* <result>
* <x>
* <y/>
* </x>
* </result></pre>
*
* <p>
* Without it there would be an endless x/y/x/y/x/y/... elements.
* </p>
*
* <p>
* The XSLTResult code tries also to deal with the fact that DTM model is built
* in a manner that childs are processed before siblings. The result is that if
* there is object x that is both set in action's x property, and very deeply
* under action's a property then it would only appear under a, not under x.
* That's not what we expect, and that's why XSLTResult allows objects to repeat
* in various places to some extent.
* </p>
*
* <p>
* Sometimes the object mesh is still very dense and you may notice that even
* though you have relatively simple stylesheet execution takes a tremendous
* amount of time. To help you to deal with that obstacle of Xalan you may
* attach regexp filters to elements paths (xpath).
* </p>
*
* <p>
* <b>Note:</b> In your .xsl file the root match must be named <tt>result</tt>.
* <br/>This example will output the username by using <tt>getUsername</tt> on your
* action class:
* <pre>
* <xsl:template match="result">
* <html>
* <body>
* Hello <xsl:value-of select="username"/> how are you?
* </body>
* <html>
* <xsl:template/>
* </pre>
*
* <p>
* In the following example the XSLT result would only walk through action's
* properties without their childs. It would also skip every property that has
* "hugeCollection" in their name. Element's path is first compared to
* excludingPattern - if it matches it's no longer processed. Then it is
* compared to matchingPattern and processed only if there's a match.
* </p>
*
* <!-- END SNIPPET: description -->
*
* <pre><!-- START SNIPPET: description.example -->
* <result name="success" type="xslt">
* <param name="location">foo.xslt</param>
* <param name="matchingPattern">^/result/[^/*]$</param>
* <param name="excludingPattern">.*(hugeCollection).*</param>
* </result>
* <!-- END SNIPPET: description.example --></pre>
*
* <p>
* In the following example the XSLT result would use the action's user property
* instead of the action as it's base document and walk through it's properties.
* The exposedValue uses an ognl expression to derive it's value.
* </p>
*
* <pre>
* <result name="success" type="xslt">
* <param name="location">foo.xslt</param>
* <param name="exposedValue">user$</param>
* </result>
* </pre>
* *
* <b>This result type takes the following parameters:</b>
*
* <!-- START SNIPPET: params -->
*
* <ul>
*
* <li><b>location (default)</b> - the location to go to after execution.</li>
*
* <li><b>parse</b> - true by default. If set to false, the location param will
* not be parsed for Ognl expressions.</li>
*
* <li><b>matchingPattern</b> - Pattern that matches only desired elements, by
* default it matches everything.</li>
*
* <li><b>excludingPattern</b> - Pattern that eliminates unwanted elements, by
* default it matches none.</li>
*
* </ul>
*
* <p>
* <code>struts.properties</code> related configuration:
* </p>
* <ul>
*
* <li><b>struts.xslt.nocache</b> - Defaults to false. If set to true, disables
* stylesheet caching. Good for development, bad for production.</li>
*
* </ul>
*
* <!-- END SNIPPET: params -->
*
* <b>Example:</b>
*
* <pre><!-- START SNIPPET: example -->
* <result name="success" type="xslt">foo.xslt</result>
* <!-- END SNIPPET: example --></pre>
*
*/
public class XSLTResult implements Result {
private static final long serialVersionUID = 6424691441777176763L;
/** Log instance for this result. */
private static final Log LOG = LogFactory.getLog(XSLTResult.class);
/** 'stylesheetLocation' parameter. Points to the xsl. */
public static final String DEFAULT_PARAM = "stylesheetLocation";
/** Cache of all tempaltes. */
private static final Map<String, Templates> templatesCache;
static {
templatesCache = new HashMap<String, Templates>();
}
// Configurable Parameters
/** Determines whether or not the result should allow caching. */
protected boolean noCache;
/** Indicates the location of the xsl template. */
private String styleshee
深入浅出Struts2(附源码)
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2014-04-09
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深入浅出Struts2(附源码) （710个子文件） 
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资源评论
nysllnjb2014-06-07适合学习，谢谢分享。。
jamwei92014-06-20资源不错，只是不太适合初学者！
花宇心坊工作室2014-04-11不错的资源，下载了，很好用，希望其他人也下载。十分贴切
