品牌网站运营,公司可以网上注册吗,怎么自己做网站教程,网站目录结构改变【0】README1#xff09;本文译自http://dom4j.sourceforge.net/dom4j-1.6.1/cookbook.html 2#xff09;intro#xff1a; 2.1#xff09;dom4j 是一个对象模型#xff0c;在内存中表示一颗XML 树。dom4j 提供了易于使用的API以提供强大的处理特性#xff0c;操纵或控制…
【0】README1本文译自http://dom4j.sourceforge.net/dom4j-1.6.1/cookbook.html 2intro 2.1dom4j 是一个对象模型在内存中表示一颗XML 树。dom4j 提供了易于使用的API以提供强大的处理特性操纵或控制 XML 和 结合 XPath XSLT 以及 SAX JAXP 和 DOM 来进行处理 2.2dom4j 是基于接口来设计的来提供高可配置的实现策略。你只需提供一个DocumentFactory的实现就可以创建你自己的XML树实现。这使得我们易于重用dom4j 的代码当扩展dom4j来提供所需特性的实现的时候 【1】读取XML 数据1introdom4j 附带了一组builder 类用于解析xml 数据和创建 类似于树的对象结构。读取XML 数据的代码如下public class DeployFileLoaderSample {/** dom4j object model representation of a xml document. Note: We use the interface(!) not its implementation */private Document doc;/*** Loads a document from a file.* param aFile the data source* throw a org.dom4j.DocumentExcepiton occurs on parsing failure.*/public void parseWithSAX(File aFile) throws DocumentException {SAXReader xmlReader new SAXReader();this.doc xmlReader.read(aFile);}/*** Loads a document from a file.* param aURL the data source* throw a org.dom4j.DocumentExcepiton occurs on parsing failure.*/public void parseWithSAX(URL aURL) throws DocumentException {SAXReader xmlReader new SAXReader();this.doc xmlReader.read(aURL);}public Document getDoc() {return doc;}
}2以上代码 阐明了使用 SAXReader根据给定文件 来创建一个完整dom4j 树。org.dom4j.io 包 包含了一组类用于创建和序列化XML对象。其中read() 方法被重载了使得你能够传递表示不同资源的对象java.lang.String - a SystemId is a String that contains a URI e.g. a URL to a XML file
java.net.URL - represents a Uniform Resource Loader or a Uniform Resource Identifier. Encapsulates a URL.
java.io.InputStream - an open input stream that transports xml data
java.io.Reader - more compatible. Has abilitiy to specify encoding scheme
org.sax.InputSource - a single input source for a XML entity. 2.1添加新方法为 为 DeployFileCreator 增加更多的扩展性代码还是上面那个代码 3测试用例如下 Testpublic void readXML() {String base System.getProperty(user.dir) File.separator src File.separator;DeployFileLoaderSample sample new DeployFileLoaderSample();try { // via parameter of URL type.sample.parseWithSAX(new URL(file: base pom.xml));Document doc sample.getDoc();System.out.println(doc.asXML());} catch (Exception e) {e.printStackTrace();}try { // via parameter of File type.sample.parseWithSAX(new File(base pom.xml));Document doc sample.getDoc();System.out.println(doc.asXML());} catch (Exception e) {e.printStackTrace();}} 【2】dom4j 和 其他XML API 整合 1introdom4j 也提供了类用于和两个原始 XML 处理APISAX 和 DOM 进行整合。 2DomReader类 允许你将一个存在的 DOM 树 转换为 dom4j 树。你也可以 转换一个DOM 文档DOM 节点分支 和 单个元素代码如下 public class DOMIntegratorSample {public DOMIntegratorSample() {}public org.w3c.dom.Document parse(URL url) {DocumentBuilderFactory factory DocumentBuilderFactory.newInstance();try {DocumentBuilder builder factory.newDocumentBuilder();return builder.parse(url.toString());} catch (Exception e) {e.printStackTrace();return null;}}/** converts a W3C DOM document into a dom4j document */public Document buildDocment(org.w3c.dom.Document domDocument) {DOMReader xmlReader new DOMReader();return xmlReader.read(domDocument);}
}public String base System.getProperty(user.dir) File.separator src File.separator;Test // 测试用例,.public void testIntegrate() {DOMIntegratorSample sample new DOMIntegratorSample();try {org.w3c.dom.Document doc sample.parse(new URL(file: base pom.xml));Document doc4j sample.buildDocment(doc);System.out.println(doc4j.asXML());} catch (Exception e) {e.printStackTrace();}} 【3】DocumentFactory 的秘密 1intro 从头到尾创建一个 Document代码如下 public class GranuatedDeployFileCreator {private DocumentFactory factory;private Document doc;public GranuatedDeployFileCreator() {this.factory DocumentFactory.getInstance(); // 单例方法.}public void generateDoc(String aRootElement) {doc factory.createDocument();Element root doc.addElement(aRootElement);}
} 1.1测试用例如下 Testpublic void testGenerateDoc() {GranuatedDeployFileCreator creator new GranuatedDeployFileCreator();creator.generateDoc(project);Document doc creator.getDoc();System.out.println(doc.asXML());} 2Document 和 Element 接口有许多 助手方法以简单的方式来创动态建 XML 文档 public class Foo {public Foo() {}public Document createDocument() {Document document DocumentHelper.createDocument();Element root document.addElement(root);Element author2 root.addElement(author).addAttribute(name, Toby).addAttribute(location, Germany).addText(Tobias Rademacher);Element author1 root.addElement(author).addAttribute(name, James).addAttribute(location, UK).addText(James Strachan);return document;}
} 2.1测试用例如下 Testpublic void testCreateDocByHelper() {Foo foo new Foo();Document doc foo.createDocument();System.out.println(doc.asXML());} 2.2dom4j 是基于API 的接口。这意味着dom4j中的 DocumentFactory 和 阅读器类 总是使用 org.dom4j 接口而不是其实现类。 集合 API 和 W3C 的DOM 也采用了这种 方式 2.3一旦你解析后创建了一个文档你就想要将其序列化到硬盘或普通流中。dom4j 提供了一组类以以下四种方式 来序列化 你的 dom4j 树 XML HTML DOM SAX Events 【4】序列化到XML 1intro 使用 XMLWriter 构造器根据给定的字符编码 来传递 输出流。相比于输出流Writer 更容易使用因为Writer 是基于字符串的因此有很少的编码问题。Writer.write()方法 被重写了你可以按需逐个写出dom4j对象 2代码如下 // 序列化xml
public class DeployFileCreator3 {private Document doc;public DeployFileCreator3(Document doc) {this.doc doc;}public void serializetoXML(OutputStream out, String aEncodingScheme) throws Exception {OutputFormat outformat OutputFormat.createPrettyPrint();outformat.setEncoding(aEncodingScheme);XMLWriter writer new XMLWriter(out, outformat);writer.write(this.doc);writer.flush();writer.close();}} 3测试用例 Testpublic void testSerializetoXML() {Foo foo new Foo();Document doc foo.createDocument();DeployFileCreator3 creator new DeployFileCreator3(doc);try {creator.serializetoXML(new FileOutputStream(base serializable.xml),UTF-8);System.out.println(serializable successfully.);} catch (Exception e) {e.printStackTrace();}} ?xml version1.0 encodingUTF-8?
rootauthor nameToby locationGermanyTobias Rademacher/authorauthor nameJames locationUKJames Strachan/author
/root 【4.1】自定义输出格式 1intro即是说你可以定义xml的输出格式aEncodingScheme // customize output format.
public class DeployFileCreator4 {private Document doc;private OutputFormat outFormat;public DeployFileCreator4(Document doc) {this.outFormat OutputFormat.createPrettyPrint();this.doc doc;}public DeployFileCreator4(Document doc, OutputFormat outFormat) {this.doc doc;this.outFormat outFormat;}public void writeAsXML(OutputStream out) throws Exception {XMLWriter writer new XMLWriter(out, this.outFormat);writer.write(this.doc);}public void writeAsXML(OutputStream out, String encoding) throws Exception {this.outFormat.setEncoding(encoding);this.writeAsXML(out);}
} 2OutputFormat中一个有趣的特性是 能够设置字符编码。使用这种机制设置XMLWriter的编码方式是一个好习惯使用这种编码方式创建OutputStream 和 输出XML的声明。 3测试用例 Testpublic void testCustomizeOutputFormat() {Foo foo new Foo();Document doc foo.createDocument();OutputFormat format OutputFormat.createCompactFormat();format.setEncoding(UTF-8);DeployFileCreator4 creator new DeployFileCreator4(doc, format);try {creator.writeAsXML(new FileOutputStream(base customizeFormat.xml));System.out.println(successful customize format);} catch (Exception e) {e.printStackTrace();}} ?xml version1.0 encodingUTF-8?
rootauthor nameToby locationGermanyTobias Rademacher/authorauthor nameJames locationUKJames Strachan/author/root 【5】打印HTML 1introHTMLWriter 带有一个dom4j 树 且会将该树 格式化为 HMTL流。这个格式化器 类似于 XMLWriter 但输出的是 CDATA 和 实体区域而不是 序列化格式的XML且它支持许多没有结束标签的HTML 元素。如br 2代码如下 public class PrintHTML {private Document doc;private OutputFormat outFormat;public PrintHTML(Document doc) {this.outFormat OutputFormat.createPrettyPrint();this.doc doc;}public PrintHTML(Document doc, OutputFormat outFormat) {this.doc doc;this.outFormat outFormat;}public void writeAsHTML(OutputStream out) throws Exception {HTMLWriter writer new HTMLWriter(out, this.outFormat);writer.write(this.doc);writer.flush();}
} 3测试用例 Testpublic void testPrintHTML() {Foo foo new Foo();Document doc foo.createDocument();PrintHTML creator new PrintHTML(doc);try {creator.writeAsHTML(new FileOutputStream(base printHtml.html));System.out.println(PrintHTML successfully);} catch (Exception e) {e.printStackTrace();}}
