DOM体式格局剖析XML
Dom剖析是将xml文件悉数载入到内存,组装成一颗dom树,然后经由过程节点以及节点之间的关联来剖析xml文件,与平台无关,java供应的一种基本的剖析XML文件的API,明白较简朴,然则因为全部文档都须要载入内存,不适用于文档较大时。 (引荐进修:java课程)
SAX体式格局剖析XML
基于事宜驱动,逐条剖析,适用于只处置惩罚xml数据,不容易编码,而且很难同时接见同一个文档中的多处差别数据
JDOM体式格局剖析XML
简化与XML的交互而且比运用DOM完成更快,仅运用细致类而不运用接口因而简化了API,而且易于运用
DOM4j体式格局剖析XML
JDOM的一种智能分支,功用较壮大,发起闇练运用
xml文件
<?xml version="1.0" encoding="utf-8" ?> <class> <student> <firstname>cxx1</firstname> <lastname>Bob1</lastname> <nickname>stars1</nickname> <marks>85</marks> </student> <student rollno="493"> <firstname>cxx2</firstname> <lastname>Bob2</lastname> <nickname>stars2</nickname> <marks>85</marks> </student> <student rollno="593"> <firstname>cxx3</firstname> <lastname>Bob3</lastname> <nickname>stars3</nickname> <marks>85</marks> </student> </class>
DOM体式格局
package com.cxx.xml; import org.w3c.dom.*; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; /** * @Author: cxx * Dom操纵xml * @Date: 2018/5/29 20:19 */ public class DomDemo { //用Element体式格局 public static void element(NodeList list){ for (int i = 0; i <list.getLength() ; i++) { Element element = (Element) list.item(i); NodeList childNodes = element.getChildNodes(); for (int j = 0; j <childNodes.getLength() ; j++) { if (childNodes.item(j).getNodeType()==Node.ELEMENT_NODE) { //猎取节点 System.out.print(childNodes.item(j).getNodeName() + ":"); //猎取节点值 System.out.println(childNodes.item(j).getFirstChild().getNodeValue()); } } } } public static void node(NodeList list){ for (int i = 0; i <list.getLength() ; i++) { Node node = list.item(i); NodeList childNodes = node.getChildNodes(); for (int j = 0; j <childNodes.getLength() ; j++) { if (childNodes.item(j).getNodeType()==Node.ELEMENT_NODE) { System.out.print(childNodes.item(j).getNodeName() + ":"); System.out.println(childNodes.item(j).getFirstChild().getNodeValue()); } } } } public static void main(String[] args) { //1.建立DocumentBuilderFactory对象 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); //2.建立DocumentBuilder对象 try { DocumentBuilder builder = factory.newDocumentBuilder(); Document d = builder.parse("src/main/resources/demo.xml"); NodeList sList = d.getElementsByTagName("student"); //element(sList); node(sList); } catch (Exception e) { e.printStackTrace(); } } }
SAX体式格局
package com.cxx.xml; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; /** * @Author: cxx * SAX剖析DOM * 一行一行 Handler * startElement * endElement * @Date: 2018/5/29 20:03 */ public class SaxDemo { public static void main(String[] args) throws Exception { //1.或去SAXParserFactory实例 SAXParserFactory factory = SAXParserFactory.newInstance(); //2.猎取SAXparser实例 SAXParser saxParser = factory.newSAXParser(); //建立Handel对象 SAXDemoHandel handel = new SAXDemoHandel(); saxParser.parse("src/main/resources/demo.xml",handel); } } class SAXDemoHandel extends DefaultHandler { //遍历xml文件最先标签 @Override public void startDocument() throws SAXException { super.startDocument(); System.out.println("sax剖析最先"); } //遍历xml文件完毕标签 @Override public void endDocument() throws SAXException { super.endDocument(); System.out.println("sax剖析完毕"); } @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { super.startElement(uri, localName, qName, attributes); if (qName.equals("student")){ System.out.println("============最先遍历student============="); //System.out.println(attributes.getValue("rollno")); } else if (!qName.equals("student")&&!qName.equals("class")){ System.out.print("节点称号:"+qName+"----"); } } @Override public void endElement(String uri, String localName, String qName) throws SAXException { super.endElement(uri, localName, qName); if (qName.equals("student")){ System.out.println(qName+"遍历完毕"); System.out.println("============完毕遍历student============="); } } @Override public void characters(char[] ch, int start, int length) throws SAXException { super.characters(ch, start, length); String value = new String(ch,start,length).trim(); if (!value.equals("")) { System.out.println(value); } } }
JDOM体式格局
<!--jdom --> <dependency> <groupId>org.jdom</groupId> <artifactId>jdom</artifactId> <version>1.1.3</version> </dependency>
package com.cxx.xml; import org.jdom.Attribute; import org.jdom.Document; import org.jdom.Element; import org.jdom.input.SAXBuilder; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.util.List; /** * @Author: cxx * JDom剖析xml * 疾速开辟XML运用程序。 * 是一个开源项目 * JDOM重要用来填补DOM和SAX在现实运用当中的不足。 * @Date: 2018/5/30 11:44 */ public class JDomDemo { public static void main(String[] args) throws Exception { //1.建立SAXBuilder对象 SAXBuilder saxBuilder = new SAXBuilder(); //2.建立输入流 InputStream is = new FileInputStream(new File("src/main/resources/demo.xml")); //3.将输入流加载到build中 Document document = saxBuilder.build(is); //4.猎取根节点 Element rootElement = document.getRootElement(); //5.猎取子节点 List<Element> children = rootElement.getChildren(); for (Element child : children) { System.out.println("经由过程rollno猎取属性值:"+child.getAttribute("rollno")); List<Attribute> attributes = child.getAttributes(); //打印属性 for (Attribute attr : attributes) { System.out.println(attr.getName()+":"+attr.getValue()); } List<Element> childrenList = child.getChildren(); System.out.println("======猎取子节点-start======"); for (Element o : childrenList) { System.out.println("节点名:"+o.getName()+"---"+"节点值:"+o.getValue()); } System.out.println("======猎取子节点-end======"); } } }
DOM4J体式格局
<!-- dom4j --> <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> <version>1.6.1</version> </dependency>
package com.cxx.xml; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.SAXReader; import java.io.File; import java.util.Iterator; import java.util.List; /** * @Author: cxx * Dom4j剖析xml * @Date: 2018/5/30 12:21 */ public class Dom4JDemo { public static void main(String[] args) throws Exception { //1.建立Reader对象 SAXReader reader = new SAXReader(); //2.加载xml Document document = reader.read(new File("src/main/resources/demo.xml")); //3.猎取根节点 Element rootElement = document.getRootElement(); Iterator iterator = rootElement.elementIterator(); while (iterator.hasNext()){ Element stu = (Element) iterator.next(); List<Attribute> attributes = stu.attributes(); System.out.println("======猎取属性值======"); for (Attribute attribute : attributes) { System.out.println(attribute.getValue()); } System.out.println("======遍历子节点======"); Iterator iterator1 = stu.elementIterator(); while (iterator1.hasNext()){ Element stuChild = (Element) iterator1.next(); System.out.println("节点名:"+stuChild.getName()+"---节点值:"+stuChild.getStringValue()); } } } }
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