java调用存储过程mysql

DELIMITER $$

CREATE
    /*[DEFINER = { user | CURRENT_USER }]*/
    PROCEDURE `test`.`text_e`(IN param1 INT ,OUT param2 VARCHAR(20))
    /*LANGUAGE SQL
    | [NOT] DETERMINISTIC
    | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
    | SQL SECURITY { DEFINER | INVOKER }
    | COMMENT ‘string‘*/
    BEGIN
		SELECT user_name INTO param2 FROM USER WHERE user_id=param1;
    END$$

DELIMITER ;

public static String getUserNameById(int id){
		Connection con = BaseDao.getConnection();
		CallableStatement proc = null;
		try {
			proc = con.prepareCall("{call text_e(?,?)}");
			proc.setInt(1, id);//输入
			proc.registerOutParameter(2, Types.VARCHAR);//输出
			proc.execute();
			return proc.getString(2);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				proc.close();
				con.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		
		return null;
		
		
	}