Java工程中动态改变Hibernate的数据库连接信息总结
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1、XML解析帮助类，采用Dom4j工具类进行处理
package com.cvicse.inforguard.cssp.util;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.List;import java.util.Map;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;import org.dom4j.xpath.DefaultXPath;/** * * * 描述：<p> 读取、重写Hibernate配置文件的工具类。</p> * 创建日期：2012-6-27 上午9:59:49<br> * @author：tianyj<br> * @update：$Date$<br> * @version：$Revision$<br> * @since 版本号，用来指定该类是从整个项目的哪个版本开始加入到项目中的 */public class ConfigHibernateHelper {private SAXReader reader = null;private File file = null;private String url = null;private Document document = null;private List<Element> nodeList = null;private XMLWriter writer = null;/** * 读取XML文件，返回根据过滤条件进行过滤的节点列表 * @param fileName 文件名称 * @param xpath 过滤条件 * @return 节点元素列表 */public List<Element> read(String fileName, String pro_xpath, String map_xpath){reader = new SAXReader(); try { url = this.getFilePath(fileName); file = new File(url); reader.setEntityResolver(new NoOpEntityResolver()); document = reader.read(file); // 获得hibernate-configuration:session-factory下的property属性节点列表 DefaultXPath propertyPath = new DefaultXPath(pro_xpath); nodeList = getNodeList(document, propertyPath); // 获得hibernate-configuration:session-factory下的mapping属性节点列表 DefaultXPath mappingPath = new DefaultXPath(map_xpath); List<Element> mappings = getNodeList(document, mappingPath); nodeList.addAll(mappings); } catch (DocumentException e) { e.printStackTrace(); } return nodeList;}/** * 根据条件返回节点列表 * @param document 文档变量 * @param propertyPath 过滤条件对象 * @return */@SuppressWarnings("unchecked") private List<Element> getNodeList(Document document, DefaultXPath propertyPath) { return propertyPath.selectNodes(document); } /** * 返回配置文件的路径 * @param fileName * @return */private String getFilePath(String fileName){return getClass().getClassLoader().getResource(fileName).getPath();}/** * 替换从前台传递的配置新的数据库连接属性 * @param paraMap 修改的数据key-value * @param nodeList 节点列表 */public List<Element> replaceNewValue(Map<String,String> paraMap, List<Element> nodeList){// 循环需要修改的节点信息，从前台进行传递过来for(Map.Entry<String, String> entry : paraMap.entrySet()){for (Element property : nodeList) { String name = property.attributeValue("name"); // 过滤掉Mapping配置文件节点 String resource = property.attributeValue("resource"); if(null != resource && "resource".equals(resource)){ break; } // 设置修改后的属性值 if(entry.getKey().equals(name) || entry.getKey().equals(name) || entry.getKey().equals(name)){ property.setText(entry.getValue()); } } }return nodeList;}/** * 把配置信息从新写入 * @param nodeList * @param fileName * @return */public boolean write(String fileName, List<Element> nodeList){url = this.getFilePath(fileName);// documentDocument document = DocumentHelper.createDocument();// 设置DocTypedocument.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"); // 添加属性 for(Element property : nodeList){ String name = property.attributeValue("name"); String resource = property.attributeValue("resource"); String text = property.getText(); // property节点操作方式 if(null != name && null!=text && !"".equals(name) && !"".equals(text)){ Element proElement = sessionfactory.addElement("property"); proElement.addAttribute("name", property.attributeValue("name").trim()); proElement.setText(property.getText().trim()); }else if(null != resource && !"".equals(resource)){ // mapping节点操作方式 Element mapping = sessionfactory.addElement("mapping"); mapping.addAttribute("resource", property.attributeValue("resource").trim()); } } //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(url)); 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(); } } } return true;}}2、修改缓存中Configuration配置数据库的信息
/** * 根据前台传递的数据库配置信息进行立即修改 * @param paraMap * @throws EXP_Base */public static void getConfiguration(Map<String, String> paraMap) throws EXP_Base{try {// 在Hibernate的缓存中移除数据库URL、用户名、密码配置信息configuration.getProperties().remove(Constant.CONNECTION_URL);configuration.getProperties().remove(Constant.CONNECTION_USERNAME);configuration.getProperties().remove(Constant.CONNECTION_PASSWORD);// 在Hibernate的缓存中添加新的数据库URL、用户名、密码配置信息configuration.getProperties().setProperty(Constant.CONNECTION_URL, paraMap.get(Constant.CONNECTION_URL));configuration.getProperties().setProperty(Constant.CONNECTION_USERNAME, paraMap.get(Constant.CONNECTION_USERNAME));configuration.getProperties().setProperty(Constant.CONNECTION_PASSWORD, paraMap.get(Constant.CONNECTION_PASSWORD));/* * 销毁SessionFactory并释放所有资源（缓存，连接池等）。 */if (sessionFactory != null) {sessionFactory.close();}sessionFactory = configuration.buildSessionFactory();} catch (Exception e) {ExceptionHandle.handle(e);}}3、常量配置信息
package com.cvicse.inforguard.cssp.util;/** * 常量定义 * * 描述：<p> 功能描述,该部分必须以中文句号结尾。</p> * 创建日期：2012-6-27 上午9:57:05<br> * @author：tianyj<br> * @update：$Date$<br> * @version：$Revision$<br> * @since 版本号，用来指定该类是从整个项目的哪个版本开始加入到项目中的 */public class Constant {// Hibernate配置文件名称public static final String CONFIG_FILE_LOCATION = "hibernate.cfg.xml";// 配置文件中URL属性名称public static final String CONNECTION_URL = "hibernate.connection.url";// 配置文件中数据库用户名public static final String CONNECTION_USERNAME = "hibernate.connection.username";// 配置文件中数据库密码public static final String CONNECTION_PASSWORD = "hibernate.connection.password";public static final String PROPERTY_XPATH = "/hibernate-configuration/session-factory/property";public static final String MAPPING_XPATH = "/hibernate-configuration/session-factory/mapping";public static final String ALL_XPATH = "/hibernate-configuration/session-factory";}4、Main方法
package com.cvicse.inforguard.cssp;import java.util.HashMap;import java.util.List;import java.util.Map;import org.dom4j.Element;import com.cvicse.inforguard.cssp.exception.EXP_Base;import com.cvicse.inforguard.cssp.service.CitySrv;import com.cvicse.inforguard.cssp.storage.dao.HibernateSessionFactory;import com.cvicse.inforguard.cssp.storage.model.TB_City;import com.cvicse.inforguard.cssp.util.ConfigHibernateHelper;import com.cvicse.inforguard.cssp.util.Constant;public class Process {/** * @param args */public static void main(String[] args) {CitySrv cs = new CitySrv();try {TB_City city = cs.getCity(85);System.out.println(city.getId() + " " + city.getName());System.out.println("-------------------------------------------------------------------");// 模仿前台传送数据Map<String, String> paraMap = new HashMap<String, String>();paraMap.put(Constant.CONNECTION_URL, "jdbc:mysql://192.168.62.173:3306/cssp?characterEncoding=UTF-8");paraMap.put(Constant.CONNECTION_USERNAME, "root");paraMap.put(Constant.CONNECTION_PASSWORD, "root");// 修改缓存配置HibernateSessionFactory.getConfiguration(paraMap);city = cs.getCity(85);System.out.println(city.getId() + " " + city.getName());// 改变重新XMLchangeDatabase(paraMap);} catch (EXP_Base e) {e.printStackTrace();}}public static void changeDatabase(Map<String, String> paraMap){ConfigHibernateHelper helper = new ConfigHibernateHelper();// 读取配置文件List<Element> nodeList = helper.read(Constant.CONFIG_FILE_LOCATION, Constant.PROPERTY_XPATH, Constant.MAPPING_XPATH);System.out.println();System.out.println();System.out.println();// 修改前printValue(nodeList);System.out.println();System.out.println();System.out.println();nodeList = helper.replaceNewValue(paraMap, nodeList);helper.write(Constant.CONFIG_FILE_LOCATION, nodeList);// 修改后printValue(nodeList);System.out.println();System.out.println();System.out.println();}public static void printValue(List<Element> nodeList){for (Element property : nodeList) { String name = property.attributeValue("name"); String text = property.getText(); if(Constant.CONNECTION_URL.equals(name) || Constant.CONNECTION_USERNAME.equals(name) || Constant.CONNECTION_PASSWORD.equals(name)){ System.out.println("$$$$$$$$$$$"+name + " : " + text+"$$$$$$$$$$$$$$$"); } }}}PS：
<1>在不连接网络的情况下，会报验证错误。
reader.setEntityResolver(new NoOpEntityResolver());
NoOpEntityResolver，这个类是实现了EntityResolver接口，不让reader读取的时候进行验证。
package com.cvicse.inforguard.cssp.util;import java.io.IOException;import java.io.StringBufferInputStream;import org.xml.sax.EntityResolver;import org.xml.sax.InputSource;import org.xml.sax.SAXException;public class NoOpEntityResolver implements EntityResolver{@SuppressWarnings("deprecation") @Override public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException { // TODO Auto-generated method stub return new InputSource(new StringBufferInputStream("")); }}<2>在jdom、dom4j中使用xpath需要导入jaxen.jar包，这个资源是包含api和jar的zip包
<3>在Hibernater缓存中存在的形式
hibernate.connection.url=jdbc:mysql://192.168.62.173:3306/cssp?characterEncoding=UTF-8
hibernate.connection.password=root
hibernate.connection.username=root
根据key得到缓存中value
在Hibernate配置文件中，配置信息connection.url是可以得到的，在缓存中Hibernate默认加上Hibernate.connection.url
configuration.getProperties().get("connection.url")
在Hibernate硬性的写成Hibernate.connection.url，上述方式获取的值为null，key=Hibernate.connection.url
SessionFactory中key-value详细信息：
[java.vendor=Sun Microsystems Inc., sun.java.launcher=SUN_STANDARD, hibernate.connection.url=jdbc:mysql://192.168.62.173:3306/cssp?characterEncoding=UTF-8, sun.management.compiler=HotSpot Client Compiler, os.name=Windows XP, sun.boot.class.path=C:\Program Files\Java\jdk1.6.0_17\jre\lib\resources.jar;C:\Program Files\Java\jdk1.6.0_17\jre\lib\rt.jar;C:\Program Files\Java\jdk1.6.0_17\jre\lib\sunrsasign.jar;C:\Program Files\Java\jdk1.6.0_17\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.6.0_17\jre\lib\jce.jar;C:\Program Files\Java\jdk1.6.0_17\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.6.0_17\jre\classes, sun.desktop=windows, hibernate.c3p0.max_size=30, java.vm.specification.vendor=Sun Microsystems Inc., java.runtime.version=1.6.0_17-b04, hibernate.connection.autocommit=true, hibernate.c3p0.min_size=5, user.name=Administrator, connection.driver_class=com.mysql.jdbc.Driver, jdbc.fetch_size=50, hibernate.c3p0.timeout=25200, user.language=zh, sun.boot.library.path=C:\Program Files\Java\jdk1.6.0_17\jre\bin, hibernate.order_inserts=false, hibernate.jdbc.use_scrollable_resultset=true, dialect=com.cvicse.inforguard.cssp.storage.dialect.MySqlDialectEx, java.version=1.6.0_17, user.timezone=, jdbc.batch_size=50, sun.arch.data.model=32, java.endorsed.dirs=C:\Program Files\Java\jdk1.6.0_17\jre\lib\endorsed, sun.cpu.isalist=pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86, sun.jnu.encoding=GBK, file.encoding.pkg=sun.io, file.separator=\, java.specification.name=Java Platform API Specification, hibernate.format_sql=false, java.class.version=50.0, user.country=CN, connection.url=jdbc:mysql://192.168.51.219:13306/cssp?characterEncoding=UTF-8, java.home=C:\Program Files\Java\jdk1.6.0_17\jre, java.vm.info=mixed mode, hibernate.c3p0.validate=true, os.version=5.1, hibernate.jdbc.fetch_size=50, path.separator=;, connection.password=cvicse, java.vm.version=14.3-b01, hibernate.connection.password=root, user.variant=, hibernate.jdbc.batch_size=50, java.awt.printerjob=sun.awt.windows.WPrinterJob, hibernate.order_updates=false, sun.io.unicode.encoding=UnicodeLittle, awt.toolkit=sun.awt.windows.WToolkit, hibernate.connection.username=root, user.home=C:\Documents and Settings\Administrator, java.specification.vendor=Sun Microsystems Inc., java.library.path=C:\Program Files\Java\jdk1.6.0_17\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files\Java\jdk1.6.0_17\jre\bin;C:\Program Files\Java\jdk1.6.0_17\bin;C:\oracle\ora92\bin;C:\myProgram File\ant-1.7.1\bin;C:\Program Files\Java\jre6\lib;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\TortoiseSVN\bin;C:\decompli;D:\IDE\apache-maven-2.2.1\bin;C:\Program Files\Microsoft Visual Studio\Common\Tools\WinNT;C:\Program Files\Microsoft Visual Studio\Common\MSDev98\Bin;C:\Program Files\Microsoft Visual Studio\Common\Tools;C:\Program Files\Microsoft Visual Studio\VC98\bin;C:\Program Files\IDM Computer Solutions\UltraEdit-32, java.vendor.url=http://java.sun.com/, hibernate.connection.driver_class=com.mysql.jdbc.Driver, connection.username=root, java.vm.vendor=Sun Microsystems Inc., hibernate.dialect=com.cvicse.inforguard.cssp.storage.dialect.MySqlDialectEx, java.runtime.name=Java(TM) SE Runtime Environment, java.class.path=D:\hibernateTest\bin;D:\hibernateTest\lib\antlr-2.7.7.jar;D:\hibernateTest\lib\asm-all-3.2.jar;D:\hibernateTest\lib\c3p0-0.9.1.jar;D:\hibernateTest\lib\cglib-2.2.jar;D:\hibernateTest\lib\com.springsource.org.apache.commons.collections-3.2.0.jar;D:\hibernateTest\lib\dom4j-1.6.1.jar;D:\hibernateTest\lib\ehcache-1.1.jar;D:\hibernateTest\lib\hibernate-3.6.0.jar;D:\hibernateTest\lib\hibernate-jpa-2.0-api-1.0.0.Final.jar;D:\hibernateTest\lib\javassist-3.12.0.GA.jar;D:\hibernateTest\lib\jta-1.1.jar;D:\hibernateTest\lib\mysql-connector-java-5.1.11.jar;D:\hibernateTest\lib\loong-logging-api-1.2.4.jar;D:\hibernateTest\lib\loong-logging-impl-1.2.4.qualifier.jar;D:\IDE\Repository\org\dom4j\com.springsource.org.dom4j\1.6.1\com.springsource.org.dom4j-1.6.1.jar;D:\IDE\Repository\jaxen\jaxen\1.1.1\jaxen-1.1.1.jar, hibernate.bytecode.use_reflection_optimizer=false, java.vm.specification.name=Java Virtual Machine Specification, java.vm.specification.version=1.0, sun.cpu.endian=little, sun.os.patch.level=Service Pack 3, hibernate.connection.provider_class=org.hibernate.connection.C3P0ConnectionProvider, connection.autocommit=true, connection.pool_size=8, java.io.tmpdir=C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\, java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport.cgi, java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment, os.arch=x86, java.ext.dirs=C:\Program Files\Java\jdk1.6.0_17\jre\lib\ext;C:\WINDOWS\Sun\Java\lib\ext, user.dir=D:\hibernateTest, hibernate.use_sql_comments=false, hibernate.c3p0.idle_test_period=3000, line.separator=, java.vm.name=Java HotSpot(TM) Client VM, hibernate.c3p0.acquire_increment=2, file.encoding=UTF-8, java.specification.version=1.6, hibernate.connection.pool_size=8, hibernate.show_sql=false, hibernate.c3p0.max_statements=100]
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