网站怎么做seo、,上海微网站开发,wordpress翻译配置,怎么进入微信官方网站使用 XSLT 格式化 XML 在平常工作中经常遇到要求对 XML 进行格式化的情况#xff0c; XSLT相比较于写纯java代码操作 org.w3c.dom.Document 更加方便#xff0c;利于维护。 下面会用一个java例子来介绍XSLT的基本用法。 场景
原始的XML
?xml version1.0…使用 XSLT 格式化 XML 在平常工作中经常遇到要求对 XML 进行格式化的情况 XSLT相比较于写纯java代码操作 org.w3c.dom.Document 更加方便利于维护。 下面会用一个java例子来介绍XSLT的基本用法。 场景
原始的XML
?xml version1.0 encodingUTF-8?
?xml version1.0 encodingUTF-8?
schoolstudentsstudentnameLucy/namegenderFemale/gender/studentstudentnameLily/namegenderFemale/gender/studentstudentnameTom/namegenderMale/gender/student/students
/school
想要把所有的女性选出来 放入下面的xml结构中
?xml version1.0 encodingUTF-8?
cityMallstorenameLucy/namenameLily/name/store
/cityMall
怎么用XSLT 实现这种转化呢。 如下 XSLT - formater.xml
xsl:stylesheet version1.0xmlns:xslhttp://www.w3.org/1999/XSL/Transformxsl:output methodxml omit-xml-declarationyesencodingUTF-8 indentyes /!-- GLOBAL VARIABLES --xsl:variable nametarget select/school/students /!-- transform template --xsl:template match/cityMallstorexsl:for-each select$target/studentxsl:if test(boolean(gender Female))xsl:copy-of selectname/xsl:copy-of/xsl:if/xsl:for-each/store/cityMall/xsl:template
/xsl:stylesheet
遍历所有的 student element 发现geneder为Female时选择它。
怎么使用JAVA 调用它呢。
Formater.java
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import com.ericsson.dve.jdv.m2m.core.util.M2MTransformerFactory;public class Formater {private static final Logger LOGGER LoggerFactory.getLogger(M2MTransformerFactory.class);public static void main(String[] args) {Formater formater new Formater();try {Document document formater.getSrcDocument(test/META-INF/source.xml);Document transformedResponse formater.transformDoc(document);System.out.println(formater.xml2Str(transformedResponse));} catch (Exception e) {LOGGER.error(Exception, e);}}private Document getSrcDocument(String srcFilePath) throws SAXException, IOException, ParserConfigurationException {Document document null;File srcDocFile new File(test/META-INF/source.xml);DocumentBuilderFactory factory DocumentBuilderFactory.newInstance();DocumentBuilder builder;builder factory.newDocumentBuilder();document builder.parse(srcDocFile);return document;}private Document transformDoc(Document srcDoc) throws TransformerConfigurationException, TransformerException {DOMResult tResult new DOMResult();M2MTransformerFactory.getTransformer(/META-INF/xslt/NewFile2.xml).transform(new DOMSource(srcDoc), tResult);Document transformedResponse (Document) tResult.getNode();return transformedResponse;}private String xml2Str(Document document) throws TransformerException {TransformerFactory factory TransformerFactory.newInstance();Transformer transformer factory.newTransformer();ByteArrayOutputStream byteArrayOutputStream new ByteArrayOutputStream();transformer.transform(new DOMSource(document), new StreamResult(byteArrayOutputStream));return byteArrayOutputStream.toString();}
}
TransformerFactory.java
import java.io.InputStream;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TransformerFactory {private static final Logger LOGGER LoggerFactory.getLogger(TransformerFactory.class);private static javax.xml.transform.TransformerFactory factory;private static Transformer transformer null;static {factory javax.xml.transform.TransformerFactory.newInstance();factory.setURIResolver(new XsltURIResolver());}private TransformerFactory() {}/*** Creates Transformer from the file passed as argument.**/public static Transformer getTransformer(String xsltFileName) throws TransformerConfigurationException {if (xsltFileName null || xsltFileName.isEmpty()) {throw new IllegalArgumentException(xslFileName argument must not be null);}try {if (transformer null) {return factory.newTransformer(new StreamSource(TransformerFactory.class.getResourceAsStream(xsltFileName)));}return transformer;} catch (TransformerConfigurationException e) {LOGGER.error(Error creating xsl Transformer for file: {}, xsltFileName);throw e;}}/*** Transformer factory URI resolver**/static class XsltURIResolver implements URIResolver {public Source resolve(String href, String base) throws TransformerException {InputStream is TransformerFactory.class.getResourceAsStream(/META-INF/xslt/ href);if (is null) {throw new TransformerException(Transformation file href not found);}return new StreamSource(is);}}
}
Note: formater.xml 应该放在Transformer.java 的相对路径 /META-INF/xslt/ 下面
之后如果需要不同格式的document都可以直接修改formater.xml 来完成。 不仅直观后续维护也更加方便。
XSLT 其他用法
chose, when ,otherwise. 进行逻辑判断。
xsl:choosexsl:when testResultDataxsl:copy-of selectResultData/*/xsl:copy-of/xsl:whenxsl:otherwisexsl:copy-of select*/xsl:copy-of/xsl:otherwise
/xsl:choose
xls:if xsl:element 动态的生成xml的element.
xsl:if testnot(boolean(/school/student/name ))xsl:element namenew_namexsl:value-of select/school/student/name/xsl:value-of/xsl:element
/xsl:if
优点XSLT 还有很多其他用法方便xml的处理。特别适合于业务逻辑复杂的转换 劣势t比单纯的java 处理 org.w3c.dom.Document 处理速度慢。 但我并没有进行大量实验就行分析对比。只是在使用过程中发现 performance略有不足。
