mybatis类型转换器如何实现数据加解密

public class DataSecurityHandler extends BaseTypeHandler {
    public static final LoadingCache<String, String> ENCRYPT_CACHE = CacheBuilder.newBuilder().expireAfterWrite(5, TimeUnit.MINUTES).build(new CacheLoader<String, String>() {
        public String load(String parameterValue) {
            return AES.encrypt(parameterValue);
        }
    });
    public static final LoadingCache<String, String> DECRYPT_CACHE = CacheBuilder.newBuilder().expireAfterWrite(5, TimeUnit.MINUTES).build(new CacheLoader<String, String>() {
        public String load(String parameterValue) {
            return AES.decrypt(parameterValue);
        }
    });
    @Override
    public void setNonNullParameter(PreparedStatement preparedStatement, int i, Object parameter, JdbcType jdbcType) throws SQLException {
        String parameterValue = (String) parameter;
        String resultValue = ENCRYPT_CACHE.getUnchecked(StringUtils.trimToEmpty(parameterValue));
        preparedStatement.setString(i, resultValue);
    }
    @Override
    public Object getNullableResult(ResultSet resultSet, String s) throws SQLException {
        return DECRYPT_CACHE.getUnchecked(StringUtils.trimToEmpty(resultSet.getString(s)));
    }
    @Override
    public Object getNullableResult(ResultSet resultSet, int i) throws SQLException {
        return DECRYPT_CACHE.getUnchecked(StringUtils.trimToEmpty(resultSet.getString(i)));
    }
    @Override
    public Object getNullableResult(CallableStatement callableStatement, int i) throws SQLException {
        return DECRYPT_CACHE.getUnchecked(StringUtils.trimToEmpty(callableStatement.getString(i)));
    }
}

#{name,jdbcType=VARCHAR,typeHandler=com..........DataSecurityHandler},

<result column="name" property="name" jdbcType="VARCHAR" typeHandler="com.*..........DataSecurityHandler"/>

 
package com.finance.entity.batctrl; 
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.Properties; 
import javax.sql.DataSource;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
 
import org.apache.commons.codec.binary.Base64;
import org.apache.ibatis.datasource.pooled.PooledDataSource;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;  
public class MyBatisSessionFactory { 
 
	/**
	 * session工厂
	 */
	private final static SqlSessionFactory sqlSessionFactory;
 
	/**
	 * 日志类
	 */
	private static Logger logger = LoggerFactory.getLogger(MyBatisSessionFactory.class);
 
	static {
        String resource = "mybatis-configuration.xml"; 
        //Reader reader = null;
        InputStream inputStream = null; 
        Properties props = new Properties();
        try {
            //reader = Resources.getResourceAsReader(resource);        	        	            
            InputStream in = Resources.getResourceAsStream("batch.properties");
            
            props.load(in);
            String url= props.getProperty("jdbc.url");
            String username= props.getProperty("jdbc.username");
            String password= props.getProperty("jdbc.password");
            
            logger.debug("befor url -> "+url);
            logger.debug("befor username -> "+username);
            logger.debug("befor decode -> "+password);
            
            byte[] b = Base64.decodeBase64(password.getBytes());
            String decode = new String(b);
            props.put("url",url);
            props.put("username",username);
            props.put("password",decode);
            logger.debug("after url -> "+url);
            logger.debug("after username -> "+username);
            logger.debug("after decode -> "+decode);
            inputStream = Resources.getResourceAsStream(resource);        
        } catch (IOException e) {
        }        
        
        //sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream ,props );
    }
 
	public static SqlSessionFactory getSessionFactory() {
		return sqlSessionFactory;
	} 
}