Spring读取加密属性文件处理--待整理

引言：Spring框架俨然已经是目前Java WEB项目开发的一个宠儿，更有人将Spring, Struts,和Hibernage称之为Java WEB项目开发的3件利器。Spring的依赖、注入、AOP及和其它框架的很好集成（如：hibername、ibatis、struts等）确实给web项目开发带来了诸多便利性，但是任何一种框架都不能完全满足个性化需求开发，spring亦是如此。现有一个项目是基于spring、struts和ibtatis的，其中数据库连接池使用的是proxool，领导要求将proxool连接池配置文件进行加密，这里有2种解决方法：

1）    扩展ProxoolDataSource，重写getNewConnection方法，对其置相关数据库配置属性时进行解密处理；

2）    扩展Spring读取属性文件文件的类PropertyPlaceholderConfigurer

1、  扩展ProxoolDataSource

package *.*;

import java.io.InputStream;

import java.sql.Connection;

import java.sql.SQLException;

import java.util.Properties;

import org.logicalcobwebs.proxool.ProxoolDataSource;

public class ProxoolDataSourceEX extends ProxoolDataSource {

         private Logger errorLog = CommonLogger.getErrorLog(ProxoolDataSourceEX.class);

         private static Properties proxoolProperties = null;

         private static ProxoolDataSource dataSource = null;

         //

         public synchronized Connection getConnection() {

                   try {

                            if (dataSource != null)

                                     return super.getConnection();

                            else

                                     return getNewConnection();

                  } catch (SQLException e) {

//                          errorLog.error("…….", e);

                   }

                   return null;

         }

        

         private synchronized Connection getNewConnection() {

                   if(proxoolProperties==null){

                            InputStream is = Thread.currentThread().getContextClassLoader().

                                     getResourceAsStream("proxool.properties");

                            proxoolProperties = new Properties();

                            try{

                                     proxoolProperties.load(is);

                            }catch(Exception e){

                                     e.printStackTrace();

                            }

                   }

                //属性值的解密（调用相应解密算法，解密）

        //解密后的属性值置入

                   this.setDriver(driver);

                   this.setDriverUrl(url);

                   …

              try {

                     return super.getConnection();

              } catch (SQLException e) {

                     errorLog.error("…", e);

                   }

                   return null;

         }

}

2、  扩展Spring读取属性文件文件的类PropertyPlaceholderConfigurer

1）    spring datasource配置

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

     <!-- ======================================================================== -->

     <!--  DataSource定义。                                                        -->

     <!-- ======================================================================== -->

     <bean id="DBConfigurer"

    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

         <property name="locations">

              <list>

                   <value>classpath:proxool.properties</value>

              </list>

         </property>

     </bean>

     <bean id="dataSource"

         class="org.logicalcobwebs.proxool.ProxoolDataSource">

         <property name="driver">

              <value>${dev_proxool_driver_class}</value>

         </property>

         <property name="driverUrl">

              <value>${dev_proxool_driver_url}</value>

         </property>

         <property name="user">

              <value>${dev_proxool_user}</value>

         </property>

         <property name="password">

              <value>${dev_proxool_password}</value>

         </property>

         <property name="alias">

              <value>${dev_proxool_alias}</value>

         </property>

         …

     </bean>

     …

</beans>

2）    扩展PropertyPlaceholderConfigurer，对其方法resolvePlaceholder进行重写。

package *.*;

import java.util.Properties;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

public class PropertyPlaceholderConfigurerEX extends PropertyPlaceholderConfigurer{

     private boolean secutiry = false;

     private Log logger = LogFactory.getLog(PropertyPlaceholderConfigurerEX.class);

     //

     protected String resolvePlaceholder(String placeholder, Properties props) {

         String placeholderValue = props.getProperty(placeholder);

         if(this.secutiry){

              placeholderValue = deEncrypt(placeholderValue);

         }

         return placeholderValue;

     }

     //

     public boolean isSecutiry() {

         return secutiry;

     }

     public void setSecutiry(boolean secutiry) {

         this.secutiry = secutiry;

     }

    

     private String deEncrypt(String miwen){

          return 解密后的字串;

     }

}

3）    修改上述的datasource配置

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

     <!-- ======================================================================== -->

     <!--  DataSource定义。                                                        -->

     <!-- ======================================================================== -->

     <bean id="DBConfigurer"

     class="*.*.PropertyPlaceholderConfigurerEX">

         <property name="locations">

              <list>

                   <value>classpath:proxool.properties</value>

              </list>

         </property>

         <!—security为false，则对属性文件的属性值不进行解密处理，为true，则进行解密-->

       <property name="secutiry">

           <value>false</value>

       </property>

        <!—扩展PropertyPlaceholderConfigurerEX，最好使用解密算法也可在此处配置-->

     </bean>

    同1）datasource配置