Java读取、创建xml(通过dom方式)文档版
Java读取、创建xml(通过dom方式)
1.创建一个DocumentBuilderFactory的实例dbf
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
2.通过dbf创建一个DocumentBuilder 出来db
DocumentBuilder db = dbf.newDocumentBuilder();
3.利用db解析文档赋值给Document对象
Document document = db.parse(fileName);
4.获取根节点
Element root = doc.getDocumentElement();
5.获取根节点
root.getNodeName();
6.获取子节点
NodeList employeeInfo = root.getChildNodes();
7.遍历子节点
for
(
int
j =
0
; j < employeeInfo.getLength(); j++)
8.获取节点的名称和节点得值
employeeInfo.item(j).getNodeName();
employeeInfo.item(j).getNodeValue();
创建一个接口
XmlInterface.java
public interface XmlInterface { /** * 建立XML文档 * @param fileName 文件全路径名称 */ public void createXml(String fileName); /** * 解析XML文档 * @param fileName 文件全路径名称 */ public void parserXml(String fileName); } |
接口实现
XmlImpl.java
package com.test.xml; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.PrintWriter; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.OutputKeys; 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.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; public class XmlImpl implements XmlInterface{ private Document document; public void init() { try { DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); this .document = builder.newDocument(); } catch (ParserConfigurationException e) { System.out.println(e.getMessage()); } } public void createXml(String fileName) { Element root = this .document.createElement( "scores" ); this .document.appendChild(root); Element employee = this .document.createElement( "employee" ); Element name = this .document.createElement( "name" ); name.appendChild( this .document.createTextNode( "wangchenyang" )); employee.appendChild(name); Element sex = this .document.createElement( "sex" ); sex.appendChild( this .document.createTextNode( "m" )); employee.appendChild(sex); Element age = this .document.createElement( "age" ); age.appendChild( this .document.createTextNode( "26" )); employee.appendChild(age); root.appendChild(employee); TransformerFactory tf = TransformerFactory.newInstance(); try { Transformer transformer = tf.newTransformer(); DOMSource source = new DOMSource(document); transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312" ); transformer.setOutputProperty(OutputKeys.INDENT, "yes" ); PrintWriter pw = new PrintWriter( new FileOutputStream(fileName)); StreamResult result = new StreamResult(pw); transformer.transform(source, result); System.out.println( "生成XML文件成功!" ); } catch (TransformerConfigurationException e) { System.out.println(e.getMessage()); } catch (IllegalArgumentException e) { System.out.println(e.getMessage()); } catch (FileNotFoundException e) { System.out.println(e.getMessage()); } catch (TransformerException e) { System.out.println(e.getMessage()); } } public void parserXml(String fileName) { try { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document document = db.parse(fileName); NodeList employees = document.getChildNodes(); for ( int i = 0 ; i < employees.getLength(); i++) { Node employee = employees.item(i); NodeList employeeInfo = employee.getChildNodes(); for ( int j = 0 ; j < employeeInfo.getLength(); j++) { Node node = employeeInfo.item(j); NodeList employeeMeta = node.getChildNodes(); for ( int k = 0 ; k < employeeMeta.getLength(); k++) { System.out.println(employeeMeta.item(k).getNodeName() + ":" + employeeMeta.item(k).getTextContent()); } } } System.out.println( "解析完毕" ); } catch (FileNotFoundException e) { System.out.println(e.getMessage()); } catch (ParserConfigurationException e) { System.out.println(e.getMessage()); } catch (SAXException e) { System.out.println(e.getMessage()); } catch (IOException e) { System.out.println(e.getMessage()); } } } |
测试
public class Main { public static void main(String args[]){ XmlImpl dd= new XmlImpl(); String str= "D:/grade.xml" ; dd.init(); dd.createXml(str); //创建xml dd.parserXml(str); //读取xml } } |
结果
生成xml
<?xml version="1.0" encoding="GB2312"?>
<scores>
<employee>
<name>wangchenyang</name>
<sex>m</sex>
<age>26</age>
</employee>
</scores>
读取xml
生成XML文件成功! #text: name:wangchenyang #text: sex:m #text: age:26 #text: 解析完毕 |