Struts+jdbc+分页 实例

根据项目里分页实例，带有注解。

 package org.tarena.netctoss.dao.impl;

 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.util.ArrayList;
 import java.util.List;

 import org.tarena.netctoss.dao.AccountDAO;
 import org.tarena.netctoss.pojo.Account;
 import org.tarena.netctoss.util.DBUtil;

 public class AccountDAOImpl implements AccountDAO {

     public List<Account> findByParameters(
             int page,int pageSize,
             String idCartNo, String realName,
             String loginName, String status) throws Exception {
         StringBuffer sql = new StringBuffer(
                 "select * from ACCOUNT ");
         //判断是否为全部
         if("-1".equals(status)){
             sql.append(" where 1=1 ");
         }else{
             sql.append(" where STATUS = ? ");
         }
         // 判断是否追加身份证条件
         if (idCartNo != null && !"".equals(idCartNo)) {
             sql.append(" and IDCARD_NO like ? ");
         }
         // 判断是否追加姓名条件
         if (realName != null && !"".equals(realName)) {
             sql.append(" and REAL_NAME like ? ");
         }
         // 判断是否追加登录名条件
         if (loginName != null && !"".equals(loginName)) {
             sql.append(" and LOGIN_NAME like ? ");
         }
 //        System.out.println(sql);
         //追加分页查询的嵌套
         StringBuffer pageSQL = new StringBuffer("");
         pageSQL.append("select * from ");
         pageSQL.append(" ( ");
         pageSQL.append(" select a.*,rownum rn ");
         pageSQL.append(" from ( ");
         pageSQL.append(sql);//sql查询语句
         pageSQL.append(" ) a ");
         pageSQL.append(" where rownum<=? ");
         pageSQL.append(" ) ");
         pageSQL.append(" where rn>=? ");
         System.out.println(pageSQL);
         try {
             // 执行sql查询
             Connection con = DBUtil.openConnection();
             PreparedStatement pst = con.prepareStatement(pageSQL.toString());
             // 设置查询参数
             List<Object> params = new ArrayList<Object>();
             //判断是否追加状态参数
             if(!"-1".equals(status)){
                 params.add(status);
             }
 //            判断是否追加身份证参数
             if (idCartNo != null && !"".equals(idCartNo)) {
                 params.add("%"+idCartNo+"%");
             }
             // 判断是否追加姓名条件
             if (realName != null && !"".equals(realName)) {
                 params.add("%"+realName+"%");
             }
             // 判断是否追加登录名条件
             if (loginName != null && !"".equals(loginName)) {
                 params.add("%"+loginName+"%");
             }
             //追加分页查询参数
             int begin = (page-1)*pageSize+1;
             int end = page*pageSize;
             params.add(end);//结束索引
             params.add(begin);//开始索引
             System.out.println(params);
             // 循环将params集合参数给sql语句设置
             for (int i = 0; i < params.size(); i++) {
                 pst.setObject(i + 1, params.get(i));
             }
             // 执行查询
             ResultSet rs = pst.executeQuery();
             List<Account> list = new ArrayList<Account>();
             while (rs.next()) {
                 Account account = new Account();
                 account.setId(rs.getInt("ID"));
                 account.setIdCardNo(rs.getString("IDCARD_NO"));
                 account.setRealName(rs.getString("REAL_NAME"));
                 account.setLoginName(rs.getString("LOGIN_NAME"));
                 account.setStatus(rs.getString("STATUS"));
                 list.add(account);
             }
             return list;
         } catch (Exception ex) {
             ex.printStackTrace();
             throw ex;
         } finally {
             DBUtil.closeConnection();
         }
     }

     public static void main(String[] args) throws Exception{
         AccountDAO dao = new AccountDAOImpl();
         List<Account> list = dao.findByParameters(
                 2,3,null, null, null, "1");
         for(Account account : list){
             System.out.println(account.getId()+" "+account.getIdCardNo()+" "+account.getRealName());
         }
     }

 }