cas源码心得

/*配置文件内容：
#设置jdbc认证
cas.authn.jdbc.query[0].url=jdbc:mysql://127.0.0.1:3306/springdemo?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&serverTimezone=GMT%2B8
cas.authn.jdbc.query[0].user=root
cas.authn.jdbc.query[0].password=****
cas.authn.jdbc.query[0].driverClass=com.mysql.jdbc.Driver
cas.authn.jdbc.query[0].sql=select * from user where name=?
cas.authn.jdbc.query[0].fieldPassword=password
*其中fieldPassword是指数据库中用户表的密码字段
*
*/
public class QueryDatabaseAuthenticationHandler extends AbstractJdbcUsernamePasswordAuthenticationHandler {//这个是cas默认的jdbc验证方式

    private final String sql;//这个是获取配置文件中的sql命令
    private final String fieldPassword;
    private final String fieldExpired;
    private final String fieldDisabled;
    private final Map<String, Object> principalAttributeMap;

    public QueryDatabaseAuthenticationHandler(final String name,
                                              final ServicesManager servicesManager,
                                              final PrincipalFactory principalFactory,
                                              final Integer order,
                                              final DataSource dataSource,
                                              final String sql,
                                              final String fieldPassword,
                                              final String fieldExpired,
                                              final String fieldDisabled,
                                              final Map<String, Object> attributes) {
        super(name, servicesManager, principalFactory, order, dataSource);
        this.sql = sql;
        this.fieldPassword = fieldPassword;
        this.fieldExpired = fieldExpired;
        this.fieldDisabled = fieldDisabled;
        this.principalAttributeMap = attributes;

        if (StringUtils.isBlank(this.fieldPassword)) {
            LOGGER.warn("When the password field is left undefined, CAS will skip comparing database and user passwords for equality "
                + ", (specially if the query results do not contain the password field),"
                + "and will instead only rely on a successful query execution with returned results in order to verify credentials");
        }
    }

如何修改cas 的jdbc验证方式，做更多自定义的操作？