标签：style blog class code c java
XML文档解主要分为四种解析方式，官方提供的两种分别是：DOM 和 SAX,第三方分别是：JDOM 和 DOM4j
测试用的xml文档：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <user> 3 <uname type="3">zhangsan</uname> 4 <uname type="2">王麻子</uname> 5 <uname>lisi</uname> 6 <pwd> 7 123456 8 <abcd> 9 aaaaaaa 10 <uname type="3">zhaoliu</uname> 11 </abcd> 12 <uname>wangwu</uname> 13 </pwd> 14 </user>
使用DOM解析如下：
1 package com.xmldemo; 2 3 import java.io.IOException; 4 import java.io.InputStream; 5 6 import javax.xml.parsers.DocumentBuilder; 7 import javax.xml.parsers.DocumentBuilderFactory; 8 import javax.xml.parsers.ParserConfigurationException; 9 10 import org.w3c.dom.Document; 11 import org.w3c.dom.Element; 12 import org.w3c.dom.NodeList; 13 import org.xml.sax.SAXException; 14 15 public class DomTest { 16 17 public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException { 18 //创建解析的工厂类 19 DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); 20 //创建解析 21 DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); 22 //获取user.xml的文件流 并且需要保证 xml放在src的根目录 23 InputStream is = DomTest.class.getClassLoader().getResourceAsStream("user.xml"); 24 //创建文档对象模型 25 Document document = documentBuilder.parse(is); 26 //获取指定节点的集合 27 NodeList nodeList = document.getElementsByTagName("uname"); 28 //遍历并获取 29 for (int i = 0; i < nodeList.getLength(); i++) { 30 Element element = (Element) nodeList.item(i); 31 System.out.println(element.getTagName() + "----->" + element.getAttribute("type") + "---->" + element.getTextContent()); 32 } 33 34 } 35 }
以下是SAX方式解析：
1 package com.xmldemo; 2 3 import java.io.IOException; 4 import java.io.InputStream; 5 import java.util.ArrayList; 6 import java.util.List; 7 8 import javax.xml.parsers.ParserConfigurationException; 9 import javax.xml.parsers.SAXParser; 10 import javax.xml.parsers.SAXParserFactory; 11 12 import org.xml.sax.Attributes; 13 import org.xml.sax.SAXException; 14 import org.xml.sax.helpers.DefaultHandler; 15 16 public class SaxTest { 17 public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException { 18 //创建解析器的工厂类 19 SAXParserFactory saxParserFactory = SAXParserFactory.newInstance(); 20 //创建解析器 21 SAXParser saxParser = saxParserFactory.newSAXParser(); 22 //获取xml文件流 23 InputStream is = SaxTest.class.getClassLoader().getResourceAsStream("user.xml"); 24 //创建自己的处理类 25 MyHandle myHandle = new MyHandle(); 26 //直接进行解析 27 saxParser.parse(is, myHandle); 28 29 for (int i = 0; i < myHandle.list.size(); i++) { 30 System.out.println("SaxTest.main()" + myHandle.list.get(i)); 31 } 32 } 33 } 34 35 /** 36 * 对XMl处理的方法 37 * @author Bjsxt2013 38 * 39 */ 40 class MyHandle extends DefaultHandler { 41 42 public List<String> list = new ArrayList<String>(); 43 44 private String elementName = null; 45 46 @Override 47 public void characters(char[] ch, int start, int length) throws SAXException { 48 //System.out.println("MyHandle.characters()" + new String(ch, start, length)); 49 if (elementName != null && "uname".equals(elementName)) { 50 //System.out.println(new String(ch, start, length)); 51 list.add(new String(ch, start, length)); 52 } 53 } 54 55 @Override 56 public void endElement(String uri, String localName, String qName) throws SAXException { 57 //System.out.println("MyHandle.endElement()" + qName); 58 elementName = null; 59 } 60 61 @Override 62 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 63 //System.out.println("MyHandle.startElement()" + qName); 64 elementName = qName; 65 } 66 67 @Override 68 public void startDocument() throws SAXException { 69 //System.out.println("MyHandle.startDocument()"); 70 } 71 72 @Override 73 public void endDocument() throws SAXException { 74 //System.out.println("MyHandle.endDocument()"); 75 } 76 }
以下是JDom方式解析：
1 package com.xmldemo; 2 3 import java.io.FileNotFoundException; 4 import java.io.FileOutputStream; 5 import java.io.IOException; 6 import java.io.InputStream; 7 import java.util.List; 8 9 import org.jdom.Attribute; 10 import org.jdom.Document; 11 import org.jdom.Element; 12 import org.jdom.JDOMException; 13 import org.jdom.input.SAXBuilder; 14 import org.jdom.output.Format; 15 import org.jdom.output.XMLOutputter; 16 17 /** 18 * 1.如何动态生成xml文件 19 * 2.如何解析xml文件 20 * 3.如何修改xml文件 21 * 22 * 如何快速的解析xml文件 23 * @author Bjsxt2013 24 * 25 */ 26 public class JdomTest { 27 28 public static void main(String[] args) throws Exception { 29 String filePath = System.getProperty("user.dir") + "\\src\\create.xml"; 30 //System.out.println(filePath); 31 //createXml(filePath); 32 parserXml(filePath); 33 } 34 35 /** 36 * 解析并修改XMl文件 37 * @param filePath 38 * @throws JDOMException 39 * @throws IOException 40 */ 41 public static void parserXml(String filePath) throws JDOMException, IOException { 42 //创建JDom的解析器 43 SAXBuilder saxBuilder = new SAXBuilder(); 44 //获取XML对象的流 45 InputStream is = JdomTest.class.getClassLoader().getResourceAsStream("create.xml"); 46 //解析并生成document对象 47 Document document = saxBuilder.build(is); 48 //获取根节点 49 Element rootElement = document.getRootElement(); 50 //修改根节点的属性 51 rootElement.setAttribute("sno", "9999"); 52 rootElement.setAttribute("type01", "aaaaaaaaaaaaaa"); 53 Attribute type = new Attribute("type", "abcdefg"); 54 rootElement.setAttribute(type); 55 56 //获取指定的子节点 57 Element stuName = rootElement.getChild("stuName"); 58 Element abcd = stuName.getChild("abcd"); 59 //获取节点对应的值 60 //System.out.println("JdomTest.parserXml()" + abcd.getText()); 61 abcd.setText("唐僧"); 62 //The attribute already has an existing parent "student" 63 //abcd.setAttribute(type); 64 65 //获取所有的子节点 66 List<Element> list = rootElement.getChildren(); 67 for (int i = 0; i < list.size(); i++) { 68 System.out.println("JdomTest.parserXml()" + list.get(i).getName()); 69 } 70 //创建新的节点 71 Element score = new Element("score"); 72 score.setText("99"); 73 rootElement.addContent(score); 74 //再所有的节点之后设置文本内容 不能直接调用setText方法 75 //rootElement.setText("abcdefghijklmn"); 76 rootElement.addContent("abcdefghij"); 77 //设置写出的格式 78 Format format = Format.getPrettyFormat();//格式良好的 79 //Format format = Format.getCompactFormat();//格式紧凑的 80 format.setEncoding("utf-8"); 81 //将文档对象模型写出到硬盘 82 XMLOutputter xmlOutputter = new XMLOutputter(format); 83 xmlOutputter.output(document, new FileOutputStream(filePath)); 84 } 85 86 /** 87 * 创建一个XML文件 88 * @param filePath 89 * @throws FileNotFoundException 90 * @throws IOException 91 */ 92 public static void createXml(String filePath) throws FileNotFoundException, IOException { 93 //创建学生节点(根节点) 94 Element rootElement = new Element("student"); 95 //添加属性 96 rootElement.setAttribute("sno", "201209888"); 97 //创建姓名节点 98 Element stuName = new Element("stuName"); 99 //给姓名节点设置值 100 stuName.setText("柳岩"); 101 //创建年龄节点 102 Element age = new Element("age"); 103 age.setText("18"); 104 //将节点连起来 105 rootElement.addContent(stuName); 106 rootElement.addContent(age); 107 108 //创建文档对象模型 109 Document document = new Document(rootElement); 110 //设置写出的格式 111 Format format = Format.getPrettyFormat();//格式良好的 112 //Format format = Format.getCompactFormat();//格式紧凑的 113 format.setEncoding("utf-8"); 114 //将文档对象模型写出到硬盘 115 XMLOutputter xmlOutputter = new XMLOutputter(format); 116 xmlOutputter.output(document, new FileOutputStream(filePath)); 117 } 118 }
标签：style blog class code c java
原文地址：http://www.cnblogs.com/IT-One/p/3730993.html
