这段代码用来在Velocity模板中遍历XML数据
XMLTest.java
/* * Copyright 2000,2004 The Apache Software Foundation. * * Licensed 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. */ import java.io.BufferedWriter; import java.io.OutputStreamWriter; import java.io.Writer; import org.apache.velocity.VelocityContext; import org.apache.velocity.Template; import org.apache.velocity.app.Velocity; import org.jdom.Document; import org.jdom.input.SAXBuilder; /** * Example to show basic XML handling in a template. * * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a> * @version $Id: XMLTest.java,v 1.2.12.1 2004/03/04 00:18:30 geirm Exp $ */ public class XMLTest { public XMLTest( String templateFile) { Writer writer = null; try { /* * and now call init */ Velocity.init(); /* * build a Document from our xml */ SAXBuilder builder; Document root = null; try { builder = new SAXBuilder( "org.apache.xerces.parsers.SAXParser" ); root = builder.build("./src/test.xml"); } catch( Exception ee) { System.out.println("Exception building Document : " + ee); return; } /* * now, make a Context object and populate it. */ VelocityContext context = new VelocityContext(); context.put("root", root); /* * make a writer, and merge the template 'against' the context */ Template template = Velocity.getTemplate(templateFile); writer = new BufferedWriter(new OutputStreamWriter(System.out)); template.merge( context , writer); } catch( Exception e ) { System.out.println("Exception : " + e); } finally { if ( writer != null) { try { writer.flush(); writer.close(); } catch( Exception ee ) { System.out.println("Exception : " + ee ); } } } } public static void main(String[] args) { XMLTest t; t = new XMLTest("./src/xml.vm"); } }
test.xml
<?xml version="1.0" encoding="UTF-8"?> <document> <properties> <author> <email>velocity-user@jakarta.apache.org</email> <name> <last> <full>Team</full> <firstinitial>T</firstinitial> </last> <first> Velocity </first> </name> </author> <title> The Jakarta Project </title> </properties> <body> I am the body </body> </document>
xml.vm
#macro ( recursive $e $indent ) #if( $e.getChildren().size() > 0 ) $indent <$e.getName()> #foreach ($child in $e.getChildren() ) #recursive( $child "$indent " ) #end $indent </$e.getName()> #else $indent <$e.getName()> $indent $e.getTextTrim() $indent </$e.getName()> #end #end #set($i = " ") First, we print out the document tree with a recursive Velocimacro : #recursive( $root.getRootElement() $i ) Next, we access pieces of data directly : email : $root.getRootElement().getChild("properties"). getChild("author").getChild("email").getText() last name : $root.getRootElement().getChild("properties").getChild("author"). getChild("name").getChild("last").getChild("full").getText()
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