XML解析器-简单工厂模式
SAX的使用
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import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; public class SaxTest1 { public static void main(String[] args) throws
Exception, SAXException { //step1: 获得SAX解析器工厂实例 SAXParserFactory factory =
SAXParserFactory.newInstance(); //step2: 获得SAX解析器实例 SAXParser parser =
factory.newSAXParser(); //step3：开始进行解析 parser.parse(new File("students.xml"),new MyHandler()); } } class MyHandler extends DefaultHandler { @Override public void startDocument() throws
SAXException { System.out.println("startDocument"); } @Override public void endDocument() throws
SAXException { System.out.println("endDocument"); } @Override public void startElement(String uri,
String localName, String qName, Attributes attributes) throws
SAXException { System.out.println("startElement"); } @Override public void endElement(String uri,
String localName, String qName) throws SAXException { System.out.println("endElement"); } } |
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import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; public class SaxTest2 { public static void main(String[] args) throws
Exception, SAXException { SAXParserFactory factory =
SAXParserFactory.newInstance(); SAXParser parser =
factory.newSAXParser(); parser.parse(new File("students.xml"), new MyHandler2()); } } class MyHandler2 extends DefaultHandler { private Stack<String> stack = new
Stack<String>(); private String name; private String sex; private String age; @Override public void startElement(String uri,
String localName, String qName, Attributes attributes) throws
SAXException { stack.push(qName); for (int i = 0; i < attributes.getLength(); i++) { String attrName =
attributes.getQName(i); String attrValue =
attributes.getValue(i); System.out.println(attrName + "=" +
attrValue); } } @Override public void characters(char[] ch, int start, int length) throws SAXException { String tag = stack.peek(); if ("name".equals(tag)) { name = new String(ch, start, length); } else if ("sex".equals(tag)) { sex = new String(ch, start, length); } else if ("age".equals(tag)) { age = new String(ch, start, length); } } @Override public void endElement(String uri,
String localName, String qName) throws SAXException { stack.pop(); if ("student".equals(qName)) { System.out.println("name = " + name); System.out.println("sex = " + sex); System.out.println("age = " + age); System.out.println(); } } } |
Dom的使用
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import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; public class DomTest1 { public static void main(String[] args) throws Exception { //step1：获得dom解析器工厂（工厂的作用是用于创建具体的解析器） DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance(); //step2: 获得具体的dom解析器 DocumentBuilder db=
dbf.newDocumentBuilder(); //step3：解析一个xml文档，获得Document对象（根结点） Document doc = db.parse(new File("students.xml")); NodeList list = doc.getElementsByTagName("student"); for(int i=0 ;i<list.getLength();i++) { Element elem=
(Element)list.item(i); String name =
elem.getElementsByTagName("name").item(0).getFirstChild().getNodeValue(); String sex =
elem.getElementsByTagName("sex").item(0).getFirstChild().getNodeValue(); Integer age = Integer.valueOf(elem.getElementsByTagName("age").item(0).getFirstChild().getNodeValue()); System.out.println(name); System.out.println(sex); System.out.println(age.intValue()); System.out.println("-------------------------"); } } } |
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import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.NodeList; public class DomTest2 { public static void main(String[] args) throws Exception { DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance(); DocumentBuilder db =
dbf.newDocumentBuilder(); Document doc = db.parse("students.xml"); System.out.println(doc.getXmlEncoding()); System.out.println(doc.getXmlVersion()); System.out.println(doc.getXmlStandalone()); System.out.println("--------------------------"); Element root = doc.getDocumentElement(); System.out.println(root.getTagName()); //空格也算结点 NodeList list = root.getChildNodes(); for(int i=0 ; i< list.getLength();i++) { System.out.println(list.item(i).getNodeName()); } System.out.println("----------------------------"); for(int i=0 ; i< list.getLength();i++) { Node
n = list.item(i); System.out.println(n.getNodeType()+":"+n.getNodeValue()); } System.out.println("----------------------------"); for(int i=0 ; i<list.getLength();i++) { Node node = list.item(i); System.out.println(node.getTextContent()); } System.out.println("----------------------------"); NodeList nodeList =
doc.getElementsByTagName("student"); for(int i=0;i<nodeList.getLength();i++) { NamedNodeMap map =
nodeList.item(i).getAttributes(); String attrName =
map.item(0).getNodeName(); String attrValue =
map.item(0).getNodeValue(); System.out.println(attrName+"="+attrValue); } System.out.println("----------------------------"); } } |
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import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Attr; import org.w3c.dom.Comment; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.NodeList; /** * 使用递归解析给定的任意一个xml文档，并把它输出到命令行上 * * @author anllin * */ public class DomTest3 { public static void main(String[] args) throws Exception { DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse(new File("students.xml")); parseElemnet(doc.getDocumentElement()); } private static void parseElemnet(Element
element) { String tagName = element.getNodeName(); NodeList childs =
element.getChildNodes(); System.out.print("<" + tagName ); NamedNodeMap map =
element.getAttributes(); if (null != map) { for (int i = 0; i < map.getLength(); i++) { Attr attr = (Attr) map.item(i); String attrName =
attr.getName(); String attrValue = attr.getValue(); System.out.print(" " +
attrName + "=\"" + attrValue + "\""); } } System.out.print(">"); for (int i = 0; i < childs.getLength(); i++) { Node node = childs.item(i); short nodeType =
node.getNodeType(); if (nodeType == Node.ELEMENT_NODE) { parseElemnet((Element)
node); } else if (nodeType == Node.TEXT_NODE) { System.out.print(node.getNodeValue()); } else if (nodeType == Node.COMMENT_NODE) { System.out.print("<!--"); Comment comment = (Comment)
node; String data = comment.getData(); System.out.println(data); System.out.print("-->"); } } System.out.print("</"+tagName+">"); } } |
Jdom的使用
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mport org.jdom.Comment; import org.jdom.Document; import org.jdom.Element; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; //jdom集成了dom和sax的优点 public class JdomTest1 { public static void main(String[] args) throws
Exception, IOException { Document document = new Document(); Comment comment = new Comment("this is my comment"); document.addContent(comment); Element root = new Element("student"); root.setAttribute("id","1"); document.addContent(root); Element e1 = new Element("name"); e1.addContent("张三"); Element e2 = new Element("sex"); e2.addContent("男"); Element e3 = new Element("age"); e3.addContent("30"); root.addContent(e1); root.addContent(e2); root.addContent(e3); Format format = Format.getPrettyFormat(); format.setIndent(" "); //format.setEncoding("gbk"); XMLOutputter out = new
XMLOutputter(format); out.output(document,new
FileOutputStream("jdom.xml")); } } |
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import org.jdom.Document; import org.jdom.Element; import org.jdom.input.SAXBuilder; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; public class JdomTest2 { public static void main(String[] args) throws Exception { SAXBuilder builder = new SAXBuilder(); Document doc=builder.build(new File("jdom.xml")); Element root=doc.getRootElement(); System.out.println(root.getName()); Element name = root.getChild("name"); System.out.println(name.getValue()); root.removeChild("age"); XMLOutputter out= new
XMLOutputter(Format.getPrettyFormat().setIndent(" ")); out.output(doc,new
FileOutputStream("jdom2.xml")); } } |
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public class JdomTest3 { public static void main(String[] args) throws Exception { //jdom可以从头至尾使用方法链 Document doc = new Document(); doc.addContent(new Element("联系人列表") .setAttribute("公司", "A集团") .addContent( new Element("联系人") .addContent(new Element("姓名").setText("张三")) .addContent(new Element("公司").setText("A公司")) .addContent( new Element("电话") .setText("(021)566991")) .addContent( new Element("地址") .addContent( new Element("街道") .setText("5街")) .addContent( new Element("城市") .setText("上海市")) .addContent( new Element("省份") .setText("上海"))))); XMLOutputter out = new
XMLOutputter(Format.getPrettyFormat().setIndent( " ")); out.output(doc, new
FileOutputStream("contact.xml")); } } |
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import org.jdom.Document; import org.jdom.Element; import org.jdom.input.SAXBuilder; public class JdomTest4 { public static void main(String[] args) throws Exception { SAXBuilder builder = new SAXBuilder(); Document doc = builder.build(new File("contact.xml")); System.out.println(doc); Element root = doc.getRootElement(); Element first = root.getChild("联系人"); List list = first.getChildren(); for (int i = 0; i < list.size(); i++) { Element elem = (Element)
list.get(i); System.out.println(elem.getName() + ":" +
elem.getText()); if (elem.getName().equals("地址")) { List list2 = elem.getChildren(); for (int j = 0; j < list2.size(); j++) { Element elem2 = (Element)
list2.get(j); System.out.println(elem2.getName()
+ ":" + elem2.getText()); } } } for (Iterator iter =
(first.getChildren()).iterator(); iter.hasNext();) { Element elem = (Element)
iter.next(); System.out.println(elem.getName() + ":" +
elem.getText()); if (elem.getName().equals("地址")) { for (Iterator iter2 =
(elem.getChildren()).iterator(); iter2 .hasNext();) { Element elem2 = (Element)
iter2.next(); System.out.println(elem2.getName()
+ ":" + elem2.getText()); } } } } } |
Dom4j的使用
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import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter; public class Dom4jTest1 { public static void main(String[] args) throws Exception { /* * Document doc = DocumentHelper.createDocument(); * * Element root =
DocumentHelper.createElement("student"); * * doc.setRootElement(root); */ Element root = DocumentHelper.createElement("student"); Document doc = DocumentHelper.createDocument(root); root.addAttribute("name", "anllin"); Element elem1 = root.addElement("sex"); elem1.addAttribute("age", "30"); XMLWriter xr = new XMLWriter(); xr.write(doc); OutputFormat format = new OutputFormat(" ", true); XMLWriter write = new XMLWriter(new
FileOutputStream("student2.xml"), format); write.write(doc); } } |
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import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader; public class Dom4jTest2 { public static void main(String[] args) throws Exception { SAXReader reader = new SAXReader(); Document doc = reader.read(new File("contactList.xml")); Element root = doc.getRootElement(); System.out.println(root.getName() + " : " + root.attributeValue("公司")); Element contact = root.element("联系人"); System.out.println(contact.getName()); for (Iterator iter =
contact.elementIterator(); iter.hasNext();) { Element elem = (Element)
iter.next(); System.out.println(elem.getName() + " " +
elem.getText()); if (elem.getName().equals("地址")) { for (Iterator iter2 =
elem.elementIterator(); iter2.hasNext();) { Element elem2 = (Element)
iter2.next(); System.out.println(elem2.getName()
+ " " + elem2.getText()); } } } List list = contact.elements(); for (int i = 0; i < list.size(); i++) { Element elem = (Element)
list.get(i); System.out.println(elem.getName() + " : " + elem.getText()); if (elem.getName().equals("地址")) { List list2 =
elem.elements(); for (int j = 0; j < list2.size(); j++) { Element elem2 = (Element)
list.get(j); System.out.println(elem2.getName()
+ " : " + elem2.getText()); } } } } } |
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import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter; public class Dom4jTest3 { public static void main(String[] args) throws Exception { //dom4j不能从头至尾使用方法链，但是可以在创建元素时使用方法链。 Element root = DocumentHelper .createElement("联系人列表").addAttribute("公司", "A集团"); Document doc = DocumentHelper.createDocument(root); Element contact = DocumentHelper.createElement("联系人"); root.add(contact); Element name = DocumentHelper.createElement("姓名").addText("张三"); Element company = DocumentHelper.createElement("公司").addText("A公司"); Element phone = DocumentHelper.createElement("电话").addText("(021)6559991"); Element address = DocumentHelper.createElement("地址"); contact.add(name); contact.add(company); contact.add(phone); contact.add(address); Element street = DocumentHelper.createElement("街道").addText("5街"); Element city = DocumentHelper.createElement("城市").addText("上海市"); Element porvince = DocumentHelper.createElement("省份").addText("上海"); address.add(street); address.add(city); address.add(porvince); //输出到控制台 OutputFormat format = new OutputFormat(" ", true); format.setEncoding("gbk"); XMLWriter xr = new
XMLWriter(format); xr.write(doc); //输出到文件中 XMLWriter write = new XMLWriter(new
FileOutputStream("contactList.xml"), format); write.write(doc); } } |
简单工厂模式
工厂类
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package com.anllin.pattern.simplefactory; public class Creator { public static Product createProduct(String
str) { if("A".equals(str)) { return new ConcreteProductA(); } else if("B".equals(str)) { return new ConcreteProductB(); } return null; } } |
抽象产品类
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package com.anllin.pattern.simplefactory; public abstract class Product { } |
具体产品类
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package com.anllin.pattern.simplefactory; public class ConcreteProductA extends Product { } public class ConcreteProductB extends Product { } |
客户端
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package com.anllin.pattern.simplefactory; public class Client { public static void main(String[] args) { Product productA = Creator.createProduct("A"); System.out.println(productA.getClass().getName()); Product productB = Creator.createProduct("B"); System.out.println(productB.getClass().getName()); } } |
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