public class DESUtil {

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

 static {
  try {
   KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
   SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
   secureRandom.setSeed(KEY_STR.getBytes());
   generator.init(secureRandom);
   key = generator.generateKey();
   generator = null;
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
 }

 /**
  * 加密
  * @param str
  * @return
  */
 public static String getEncryptString(String str) {
  BASE64Encoder base64encoder = new BASE64Encoder();
  try {
   byte[] bytes = str.getBytes(CHARSETNAME);
   Cipher cipher = Cipher.getInstance(ALGORITHM);
   cipher.init(Cipher.ENCRYPT_MODE, key);
   byte[] doFinal = cipher.doFinal(bytes);
   return base64encoder.encode(doFinal);
  } catch (Exception e) {
   // TODO: handle exception
   throw new RuntimeException(e);
  }
 }

 /**
  * 解密
  * @param str
  * @return
  */
 public static String getDecryptString(String str) {
  BASE64Decoder base64decoder = new BASE64Decoder();
  try {
   byte[] bytes = base64decoder.decodeBuffer(str);
   Cipher cipher = Cipher.getInstance(ALGORITHM);
   cipher.init(Cipher.DECRYPT_MODE, key);
   byte[] doFinal = cipher.doFinal(bytes);
   return new String(doFinal, CHARSETNAME);
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
 }
}

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf-8&allowMultiQueries=true&serverTimezone=UTC
jdbc.username=WnplV/ietfQ=
jdbc.password=xyHEykQVHqA=

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

 @Override
 protected String convertProperty(String propertyName, String propertyValue) {
  if (isEncryptProp(propertyName)) {
   // 解密
   String decryptValue = DESUtil.getDecryptString(propertyValue);
   return decryptValue;
  } else {
   return propertyValue;
  }
 }

 private boolean isEncryptProp(String propertyName) {
  for (String encryptpropertyName : encryptPropNames) {
   if (encryptpropertyName.equals(propertyName))
    return true;
  }
  return false;
 }
}

<!-- <context:property-placeholder location="classpath:*.properties"/> -->
 
<bean class="com.light.ac.common.configuration.EncryptPropertyPlaceholderConfigurer">
 <property name="locations">
  <list>
   <value>classpath:db.properties</value>
  </list>
 </property>
 <property name="fileEncoding" value="UTF-8"/>
</bean>