/**
 * 帶加密的Spring屬性配置文件擴展類
 * 加密方式：AES
 * @author simon
 *
 */
public class EncryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {

 //指定需要加密的屬性
 private String[] propertyNames = {"db.password"};

 /**
  * 解密指定propertyName的屬性值
  * @param propertyName
  * @param propertyValue
  * @return
  */
 @Override
 protected String convertProperty(String propertyName, String propertyValue) {
  //過濾出需要解密的屬性
  for (String p : propertyNames) {
   if (p.equalsIgnoreCase(propertyName)) {
    try {
     //返回AES解密后的字符串
     return new String(SymmetricCryptoUtil.decryptAESWithDefaultKey(EncodeUtil.decodeBase64(propertyValue)));
    } catch (Exception e) {
     e.printStackTrace();
    }
   }
  }
  return super.convertProperty(propertyName, propertyValue);
 }

}

<!-- 加載加密后的配置文件 -->
<bean class="com.bounter.mybatis.extension.EncryptPropertyPlaceholderConfigurer">
 <property name="locations">
 <list>
  <value>classpath:db.properties</value>
 </list>
 </property>
</bean>

db.driver=
db.url=
db.username=root
#AES encrypt,Base64 encode
db.password=jFYmt2f57RHhzItYDhWiSA==