<Resource 
         name="jndi/mpsdb"
         auth="Container"
         type="javax.sql.DataSource"

         maxactive="100"
         maxidle="100"
         maxwait="300"

         username="mpsgxzq"
         factory="%path%.TomcatSecurityDataSourceFactory"
         password="bXBzZ3h6cQ=="

         driverClassName="oracle.jdbc.OracleDriver"

         url="jdbc:oracle:thin:@localhost:1521:mps"/>

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.Name;

import org.apache.tomcat.dbcp.dbcp.BasicDataSource;
import org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory;

import com.hylandtec.mps.bas.util.CryptoUtil;

/**
 * tomcat7 jndi 加密
 * @author ccc
 *
 */
public class TomcatSecurityDataSourceFactory extends BasicDataSourceFactory {

    @Override
    public Object getObjectInstance(Object obj, Name name, Context nameCtx, Hashtable environment) throws Exception {
        Object o = super.getObjectInstance(obj, name, nameCtx, environment);
        if (o != null) {
            BasicDataSource ds = (BasicDataSource) o;
            if (ds.getPassword() != null && ds.getPassword().length() > 0) {
                // 密码解密逻辑
                String pwd = CryptoUtil.decrypt_Base64(ds.getPassword());
                ds.setPassword(pwd);
            }
            return ds;
        } else {
            return null;
        }
    }

}

import java.math.BigInteger;
import java.security.MessageDigest;

import org.apache.commons.codec.binary.Base64;



public class CryptoUtil {
    /***
     * Base64加密
     * @param str 需要加密的参数
     * @return
     * @throws Exception
     */
    public static String encrypt_Base64(String str) throws Exception {
        byte[] result = Base64.encodeBase64Chunked(str.getBytes("UTF-8"));
        //String result = Base64.getEncoder().encodeToString(str.getBytes("UTF-8"));
        return new String(result);
    }

    /***
     * Base64解密
     * @param str 需要解密的参数
     * @return
     * @throws Exception
     */
    public static String decrypt_Base64(String str) throws Exception {
        byte[] asBytes = Base64.decodeBase64(str.getBytes());
        //byte[] asBytes = Base64.getDecoder().decode(str);
        String result = new String(asBytes,"UTF-8");
        return result;
    }
}