Dom4J学习XML读写更新

创建xml

/** *@author Hj, Date: 2011-5-10 * Email: [e-mail] */package xml.write;import java.io.File;import java.io.FileWriter;import org.dom4j.*;import org.dom4j.io.OutputFormat;import org.dom4j.io.XMLWriter;public class CreateXml {/** * @param args */public static void main(String[] args) {Document doc = DocumentHelper.createDocument();Element emRoot = doc.addElement("Data");Element emRow = emRoot.addElement("row");Element emSal = emRoot.addElement("sal");emRow.addAttribute("id", "000001");emRow.setText("黄坚");emSal.setText("5000");emRow = emRoot.addElement("row");emSal = emRoot.addElement("sal");emRow.addAttribute("id", "000002");emRow.setText("hj");emSal.setText("6000");try {OutputFormat format = OutputFormat.createPrettyPrint();format.setEncoding("utf-8");XMLWriter xw = new XMLWriter(new FileWriter(new File("test.xml")),format);xw.write(doc);xw.close();} catch (Exception e) {e.printStackTrace();}}}

删除元素：下面实例只能删除根元素一个元素，元素有重复无法删除

/** *@author Hj, Date: 2011-5-10 * Email: [e-mail] */package xml.update;import java.io.File;import java.io.FileWriter;import java.util.Iterator;import java.util.List;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class UpdateXml {/** * @param args */public static void main(String[] args) {SAXReader reader = new SAXReader();String file = "test.xml";try {Document doc = reader.read(new File(file));//删除元素，必须先取得上一层元素List<?> list = doc.selectNodes("/Data"); for(Object obj:list){Element emData = (Element) obj;Element emSal = emData.element("sal");emData.remove(emSal);}try {// 设置输出格式,默认createCompactFormat()，不带格式输出OutputFormat format = OutputFormat.createPrettyPrint();// 设置输出编码format.setEncoding("utf-8");XMLWriter xw = new XMLWriter(new FileWriter(new File(file)),format);xw.write(doc);xw.close();} catch (Exception e) {e.printStackTrace();}} catch (DocumentException e) {e.printStackTrace();}}}

修改元素属性：

/** *@author Hj, Date: 2011-5-10 * Email: [e-mail] */package xml.update;import java.io.File;import java.io.FileWriter;import java.util.Iterator;import java.util.List;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class UpdateXml {/** * @param args */public static void main(String[] args) {SAXReader reader = new SAXReader();String file = "test.xml";try {Document doc = reader.read(new File(file));// 读取Data根元素下的sal元素List<?> list = doc.selectNodes("Data/sal");for (Object obj : list) {Element emSal = (Element) obj;// 获取sal元素的textString strSal = emSal.getText();// 设置sal为原sal*2double sal = Double.parseDouble(strSal);emSal.setText("" + (sal * 2));}//修改元素属性List<?> alist = doc.selectNodes("Data/row/@id");Iterator<?> ite = alist.iterator();while (ite.hasNext()) {Attribute ab = (Attribute) ite.next();ab.setValue("yes");}try {// 设置输出格式,默认createCompactFormat()，不带格式输出OutputFormat format = OutputFormat.createPrettyPrint();// 设置输出编码format.setEncoding("utf-8");XMLWriter xw = new XMLWriter(new FileWriter(new File(file)),format);xw.write(doc);xw.close();} catch (Exception e) {e.printStackTrace();}} catch (DocumentException e) {e.printStackTrace();}}}

 

更新元素内容

/** *@author Hj, Date: 2011-5-10 * Email: [e-mail] */package xml.update;import java.io.File;import java.io.FileWriter;import java.util.List;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class UpdateXml {/** * @param args */public static void main(String[] args) {SAXReader reader = new SAXReader();String file = "test.xml";try {Document doc = reader.read(new File(file));//读取Data根元素下的sal元素List<?> list = doc.selectNodes("Data/sal");for (Object obj : list) {Element emSal = (Element) obj;//获取sal元素的textString strSal = emSal.getText();//设置sal为原sal*2double sal = Double.parseDouble(strSal);emSal.setText("" + (sal * 2));}try {//设置输出格式,默认createCompactFormat()，不带格式输出OutputFormat format = OutputFormat.createPrettyPrint();//设置输出编码format.setEncoding("utf-8");XMLWriter xw = new XMLWriter(new FileWriter(new File(file)),format);xw.write(doc);xw.close();} catch (Exception e) {e.printStackTrace();}} catch (DocumentException e) {e.printStackTrace();}}}

<?xml version="1.0" encoding="utf-8"?><Data> <row id="000001">hj</row> <sal>9600.0</sal> <row id="000001">ss</row> <sal>400.0</sal> </Data>