商铺项目（使用DES加密配置信息）

package com.ouyan.o2o.util;

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用相同密钥的算法。
 * 
 * @author 
 *
 */
public class DESUtil {

    private static Key key;
    // 设置密钥key
    private static String KEY_STR = "myKey";
    private static String CHARSETNAME = "UTF-8";
    private static String ALGORITHM = "DES";

    static {
        try {
            // 生成DES算法对象
            KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
            // 运用SHA1安全策略
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            // 设置上密钥种子
            secureRandom.setSeed(KEY_STR.getBytes());
            // 初始化基于SHA1的算法对象
            generator.init(secureRandom);
            // 生成密钥对象
            key = generator.generateKey();
            generator = null;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 获取加密后的信息
     * 
     * @param str
     * @return
     */
    public static String getEncryptString(String str) {
        // 基于BASE64编码，接收byte[]并转换成String
        BASE64Encoder base64encoder = new BASE64Encoder();
        try {
            // 按UTF8编码
            byte[] bytes = str.getBytes(CHARSETNAME);
            // 获取加密对象
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            // 初始化密码信息
            cipher.init(Cipher.ENCRYPT_MODE, key);
            // 加密
            byte[] doFinal = cipher.doFinal(bytes);
            // byte[]to encode好的String并返回
            return base64encoder.encode(doFinal);
        } catch (Exception e) {
            // TODO: handle exception
            throw new RuntimeException(e);
        }
    }

    /**
     * 获取解密之后的信息
     * 
     * @param str
     * @return
     */
    public static String getDecryptString(String str) {
        // 基于BASE64编码，接收byte[]并转换成String
        BASE64Decoder base64decoder = new BASE64Decoder();
        try {
            // 将字符串decode成byte[]
            byte[] bytes = base64decoder.decodeBuffer(str);
            // 获取解密对象
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            // 初始化解密信息
            cipher.init(Cipher.DECRYPT_MODE, key);
            // 解密
            byte[] doFinal = cipher.doFinal(bytes);
            // 返回解密之后的信息
            return new String(doFinal, CHARSETNAME);
        } catch (Exception e) {
            // TODO: handle exception
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        System.out.println(getEncryptString("work"));
        System.out.println(getEncryptString("230230"));
    }

}

jdbc.driver=com.mysql.jdbc.Driver
jdbc.slave.url=jdbc:mysql://localhost:3306/o2o?useUnicode=true&characterEncoding=utf8
jdbc.master.url=jdbc:mysql://localhost:3306/o2o?useUnicode=true&characterEncoding=utf8
jdbc.username=zCKAAEaFQUI=
jdbc.password=TdixoQRe6Y0=

package com.ouyan.o2o.util;

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

public class EncryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
    // 需要加密的字段数组
    private String[] encryptPropNames = { "jdbc.username", "jdbc.password" };

    /**
     * 对关键的属性进行转换
     */
    @Override
    protected String convertProperty(String propertyName, String propertyValue) {
        if (isEncryptProp(propertyName)) {
            // 对已加密的字段进行解密工作
            String decryptValue = DESUtil.getDecryptString(propertyValue);
            return decryptValue;
        } else {
            return propertyValue;
        }
    }

    /**
     * 该属性是否已加密
     * 
     * @param propertyName
     * @return
     */
    private boolean isEncryptProp(String propertyName) {
        // 若等于需要加密的field，则进行加密
        for (String encryptpropertyName : encryptPropNames) {
            if (encryptpropertyName.equals(propertyName))
                return true;
        }
        return false;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 配置整合mybatis过程 -->
        <!-- 1.配置数据库相关参数properties的属性：${url} -->
    <bean class="com.ouyan.o2o.util.EncryptPropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
            </list>
        </property>
    </bean>
    <!-- 2.数据库连接池 -->
    <bean id="abstractDataSource" abstract="true" destroy-method="close"
        class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30" />
        <property name="minPoolSize" value="10" />
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false" />
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000" />
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2" />
    </bean>
    <bean id="master" parent="abstractDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="jdbcUrl" value="${jdbc.master.url}" />
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    <bean id="slave" parent="abstractDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="jdbcUrl" value="${jdbc.slave.url}" />
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    <!-- 3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource" />
        <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml" />
        <!-- 扫描entity包 使用别名 -->
        <property name="typeAliasesPackage" value="com.ouyan.o2o.entity" />
        <!-- 扫描sql配置文件:mapper需要的xml文件 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml" />
    </bean>
    <!-- 配置动态数据源，这儿targetDataSources就是路由数据源对应的名称 -->
    <bean id="dynamicDataSource" class="com.ouyan.o2o.dao.split.DynamicDataSource">
        <property name="targetDataSources">
            <map>
                <entry value-ref="master" key="master"></entry>
                <entry value-ref="slave" key="slave"></entry>
            </map>
        </property>
    </bean>
    <bean id="dataSource" class="org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy">
        <property name="targetDataSource">
            <ref bean="dynamicDataSource"/>        
        </property>
    </bean>
    <!-- 4.配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.ouyan.o2o.dao" />
    </bean>
</beans>