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public static List getPageUser(int currentPage) throws Exception {//?List
         Connection conn = null;
         PreparedStatement prep = null;
         ResultSet rs = null;
         List result = new ArrayList();// ½Ó¿Ú List<E>£¬ ´Ë½Ó¿ÚµÄÓû§¿ÉÒÔ¶ÔÁбíÖÐÿ¸öÔªËصIJåÈëλÖýøÐо«È·µØ¿ØÖÆ¡£Óû§¿ÉÒÔ¸ù¾ÝÔªËصÄÕûÊýË÷Òý£¨ÔÚÁбíÖеÄλÖã©·ÃÎÊÔªËØ£¬²¢ËÑË÷ÁбíÖеÄÔªËØ¡£
public class ArrayList<E>extends AbstractList<E>implements List<E>, RandomAccess, Cloneable,SerializableList ½Ó¿ÚµÄ´óС¿É±äÊý×éµÄʵÏÖ¡£ÊµÏÖÁËËùÓпÉÑ¡Áбí²Ù×÷£¬²¢ÔÊÐí°üÀ¨ null ÔÚÄÚµÄËùÓÐÔªËØ¡£³ýÁËʵÏÖ List ½Ó¿ÚÍ⣬´ËÀ໹ÌṩһЩ·½·¨À´²Ù×÷ÄÚ²¿ÓÃÀ´´æ´¢ÁбíµÄÊý×éµÄ´óС¡£
         try {
             conn = new DBConnection().getConnection();
             int rowCount = getCount();//·µ»ØÓû§×ÜÊý
             int pageSize = getPageSize();//
             //Ó¦»ñÈ¡µÄ¼Ç¼Êý
             int rows = (rowCount - (currentPage - 1) * getPageSize()) >
                        getPageSize() ?
                        pageSize : (rowCount - (currentPage - 1) * getPageSize());
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