<?xml version="1.0"?>

<configuration>

  <connectionStrings name="zhangsan">

    <add name="dbSqlServer" connectionString="Data Source=.;Initial Catalog=Life;User ID=sa;pwd=hzsoft"/>

    <add name="dbAccess" connectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=|DataDirectory|\Life.mdb;"/>

    <add name="dbSqlite" connectionString="Data Source=|DataDirectory|\Life.db3;Pooling=true;FailIfMissing=false" providerName="System.Data.SQLite"/>

  </connectionStrings>

</configuration>

import java.io.File;

import java.util.List;

import org.dom4j.*;

import org.dom4j.io.SAXReader;

public class Hello {

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        SAXReader reader = new SAXReader();

        File f = new File("D:\\Web.xml");

        try {

            Document document = reader.read(f);

            Element root = document.getRootElement();

            Element conn = root.element("connectionStrings");

            String val = conn.attribute("name").getValue();

            System.out.println(val);

            List list = conn.elements("add");

            for (int i = 0; i < list.size(); i++) {

                Element ele = (Element) list.get(i);

                System.out.println(ele.attribute("connectionString").getValue());

            }

            ///////// foreach实现

            for (Object obj : list) {

                Element ele = (Element) obj;

                System.out.println(ele.attribute("connectionString").getValue());

            }

        } catch (DocumentException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

}

import java.io.*;

import org.dom4j.*;

import org.dom4j.io.*;

public class App {

    public static void main(String[] args) throws IOException {

        Document document = DocumentHelper.createDocument();

        Element root = DocumentHelper.createElement("configuration");

        document.setRootElement(root);

        Element eleConnectionStrings = root.addElement("connectionStrings");

        eleConnectionStrings.addAttribute("name", "zhangsan");

        Element eleAdd = eleConnectionStrings.addElement("add");

        eleAdd.addAttribute("name", "dbSqlServer");

        // 格式化，避免写入文件是一行数据

        OutputFormat opf = new OutputFormat();

        opf.setNewlines(true);

        opf.setIndent(true);

        opf.setEncoding("utf-8");//编码格式

        opf.setIndent("    ");// 使用4个空格进行缩进, 可以兼容文本编辑器

        XMLWriter xmlWriter = new XMLWriter(new FileOutputStream("config.xml"), opf);

        xmlWriter.write(document);

        // xmlWriter.flush();

        xmlWriter.close(); //上面的方法无法完全释放资源

    }

}