spring jdbc配置文件进行加密解密

最近做一个项目，安全上有点要求，就是要对数据库相关的配置进行加密，配置文件如下：

#加密前
#datasource.type=mysql
#datasource.driverClassName=com.mysql.jdbc.Driver
#datasource.url=jdbc:mysql://localhost:3306/yjj?useUnicode=true&characterEncoding=utf8
#datasource.username=root
#datasource.password=root
#加密后
datasource.type=2DF0ADA00FAA99D2
datasource.driverClassName=DFB084E48D901F55B4765B6B6DEEEA685621CEAB85E65590
datasource.url=CD1E7D3A7DEED845CC284EB8AB50F88E171BEAD6E699A4B2E87A3F36434640EA07523DB201ACF884EF00CBBAD67FB52A04960D6C3E91E3EABF370CE3E6FACD06915D92108869CBB9
datasource.username=63AEB7FA5F01BC70
datasource.password=63AEB7FA5F01BC70

    <!-- 对JDBC配置进行解密  --> 
    <bean id="propertyConfigurer" class="xxx.security.EncryptablePropertyPlaceholderConfigurer">  
            <property name="locations">
                <list>
                    <value>classpath:conf/jdbc.properties</value>
                    <value>classpath:conf/memcache.properties</value>
                </list>
            </property>
    </bean>
       
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close" >
        <property name="driverClass">
            <value>${datasource.driverClassName}</value>
        </property>

        <property name="jdbcUrl">
            <value>${datasource.url}</value>
        </property>
        <property name="user">
            <value>${datasource.username}</value>
        </property>
        <property name="password">
            <value>${datasource.password}</value>
        </property>

        <property name="minPoolSize">
            <value>${datasource.c3p0.minPoolSize}</value>
        </property>

        <property name="maxPoolSize">
            <value>${datasource.c3p0.maxPoolSize}</value>
        </property>

        <property name="maxIdleTime">
            <value>${datasource.c3p0.maxIdleTime}</value>
        </property>

        <property name="acquireIncrement">
            <value>${datasource.c3p0.acquireIncrement}</value>
        </property>
        <property name="maxStatements">
            <value>${datasource.c3p0.maxStatements}</value>
        </property>
        <property name="initialPoolSize">
            <value>${datasource.c3p0.initialPoolSize}</value>
        </property>

        <property name="idleConnectionTestPeriod">
            <value>${datasource.c3p0.idleConnectionTestPeriod}</value>
        </property>

        <property name="numHelperThreads">
            <value>${datasource.c3p0.numHelperThreads}</value>
        </property>

        <property name="acquireRetryAttempts">
            <value>${datasource.c3p0.acquireRetryAttempts}</value>
        </property>

        <property name="breakAfterAcquireFailure">
            <value>${datasource.c3p0.breakAfterAcquireFailure}</value>
        </property>
        <property name="testConnectionOnCheckout">
            <value>${datasource.c3p0.testConnectionOnCheckout}</value>
        </property>
    </bean>

JAVA加密，解密类如下：

import java.util.Properties;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

import cn.com.dbappsecurity.common.utils.DesEncrypt;
import cn.com.dbappsecurity.common.utils.MyWebConstant;

public class EncryptablePropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
    private static final String key = MyWebConstant.JDBC_DESC_KEY;

    protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props)
        throws BeansException {
            try {
//                DesEncrypt des = new DesEncrypt();
                String username = props.getProperty(MyWebConstant.JDBC_DATASOURCE_USERNAME_KEY);
                if (username != null) {
                    props.setProperty(MyWebConstant.JDBC_DATASOURCE_USERNAME_KEY, DesEncrypt.Decrypt(username, DesEncrypt.hex2byte(key)));
                }
                
                String password = props.getProperty(MyWebConstant.JDBC_DATASOURCE_PASSWORD_KEY);
                if (password != null) {
                    props.setProperty(MyWebConstant.JDBC_DATASOURCE_PASSWORD_KEY, DesEncrypt.Decrypt(password, DesEncrypt.hex2byte(key)));
                }
                
                String url = props.getProperty(MyWebConstant.JDBC_DATASOURCE_URL_KEY);
                if (url != null) {
                    props.setProperty(MyWebConstant.JDBC_DATASOURCE_URL_KEY, DesEncrypt.Decrypt(url, DesEncrypt.hex2byte(key)));
                }
                
                String driverClassName = props.getProperty(MyWebConstant.JDBC_DATASOURCE_DRIVERCLASSNAME_KEY);
                if(driverClassName != null){
                    props.setProperty(MyWebConstant.JDBC_DATASOURCE_DRIVERCLASSNAME_KEY, DesEncrypt.Decrypt(driverClassName, DesEncrypt.hex2byte(key)));
                }
                String dbtype = props.getProperty(MyWebConstant.JDBC_DATASOURCE_TYPE_KEY);
                if(dbtype != null){
                    props.setProperty(MyWebConstant.JDBC_DATASOURCE_TYPE_KEY, DesEncrypt.Decrypt(dbtype, DesEncrypt.hex2byte(key)));
                }
                super.processProperties(beanFactory, props);
            } catch (Exception e) {
                e.printStackTrace();
                throw new BeanInitializationException(e.getMessage());
            }
        }
    }

    /******************************JDBC相关BEGIN***************************************/
    public static final String JDBC_DESC_KEY = "0001000200030004";
    
    /**数据库类型**/
    public static final String JDBC_DATASOURCE_TYPE_KEY = "datasource.type";
    
    public static final String JDBC_DATASOURCE_DRIVERCLASSNAME_KEY = "datasource.driverClassName";
    
    public static final String JDBC_DATASOURCE_URL_KEY = "datasource.url";
    
    public static final String JDBC_DATASOURCE_USERNAME_KEY = "datasource.username";
    
    public static final String JDBC_DATASOURCE_PASSWORD_KEY = "datasource.password";
    
    /******************************JDBC相关END***************************************/