使用dom4j生成和读取hibernate.cfg.xml

package com.test;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Create {

	public static void main(String[] args) {
		
		//document
		Document document = DocumentHelper.createDocument();
		//设置DocType
		document.addDocType("hibernate-configuration" , "-//Hibernate/Hibernate Configuration DTD 3.0//EN" , "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd");
		//hibernate-configuration
		Element configuration = document.addElement("hibernate-configuration");
		//session-factory
		Element sessionfactory = configuration.addElement("session-factory");
		sessionfactory.addComment("Database connection settings");
		//driver
		Element classDriver = sessionfactory.addElement("property");
		classDriver.addAttribute("name", "connection.driver_class");
		classDriver.setText("com.mysql.jdbc.Driver");
		//url
		Element url = sessionfactory.addElement("property");
		url.addAttribute("name", "connection.url");
		url.setText("jdbc:mysql://localhost:3306/1ting");
		//username
		Element username = sessionfactory.addElement("property");
		username.addAttribute("name", "connection.username");
		username.setText("root");
		//password
		Element password = sessionfactory.addElement("property");
		password.addAttribute("name", "connection.password");
		password.setText("root");
		//pool
		sessionfactory.addComment("pool size management");
		Element pool = sessionfactory.addElement("property");
		pool.addAttribute("name", "connection.pool_size");
		pool.setText("1");
		//dialect
		sessionfactory.addComment("dialect management");
		Element dialect = sessionfactory.addElement("property");
		dialect.addAttribute("name", "dialect");
		dialect.setText("org.hibernate.dialect.MySQL5Dialect");
		//showsql
		sessionfactory.addComment("showsql");
		Element showsql = sessionfactory.addElement("property");
		showsql.addAttribute("name", "show_sql");
		showsql.setText("true");
		//hbm2ddl
		sessionfactory.addComment("Drop and re-create the database schema on startup");
		Element hbm2ddl = sessionfactory.addElement("property");
		hbm2ddl.addAttribute("name", "hbm2ddl.auto");
		hbm2ddl.setText("update");
		//mapping
		sessionfactory.addComment("mapping class");
		Element mapping1 = sessionfactory.addElement("mapping");
		mapping1.addAttribute("class", "edu.hzu.entity.SingerType");
		Element mapping2 = sessionfactory.addElement("mapping");
		mapping2.addAttribute("class", "edu.hzu.entity.Singer");
		//生成xml
		XMLWriter writer = null;
		//设置输出格式
		OutputFormat format = new OutputFormat();
		format.setEncoding("utf-8");
		format.setIndent(true);
		format.setLineSeparator("\n");
		format.setNewlines(true);
		try {
			writer = new XMLWriter(format);
			writer.setOutputStream(new FileOutputStream("hibernate.cfg.xml"));
			writer.write(document);
			writer.flush();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if(writer != null) {
				try {
					writer.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
}

 

package com.test;

import java.io.File;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.xpath.DefaultXPath;


public class Reader {
	
	@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		SAXReader reader = new SAXReader();
		System.out.println("read all properties");
		System.out.println("-------------------");
		try {
			Document document = reader.read(new File("hibernate.cfg.xml"));
			DefaultXPath propertyPath = new DefaultXPath("/hibernate-configuration/session-factory/property");
			List<Element> selectNodes = propertyPath.selectNodes(document);
			for (Element property : selectNodes) {
				String name = property.attributeValue("name");
				String text = property.getText();
				System.out.println(name + " : " + text);
			}
			System.out.println("-------------------");
			System.out.println("Mappings");
			System.out.println("-------------------");
			DefaultXPath mappingPath = new DefaultXPath("/hibernate-configuration/session-factory/mapping");
			List<Element> mappings = mappingPath.selectNodes(document);
			for (Element mapping : mappings) {
				System.out.println(mapping.attributeValue("class"));
			}
		} catch (DocumentException e) {
			e.printStackTrace();
		}
	}
	
}