客户管理系统javaweb，没有使用框架

package com.sxxy.dao.impl; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.List; import com.sxxy.dao.CustomerDAO; import com.sxxy.po.CustomerInfo; import com.sxxy.util.DBCon; public class CustomerDAOImpl implements CustomerDAO { public boolean add(CustomerInfo customerInfo) { // 添加 Connection con = null; PreparedStatement pre = null; try { String sql = "insert into customer_info (condition_id,source_id,user_id, " + "type_id,customer_name,customer_sex,customer_mobile,customer_qq, " + "customer_address,customer_email,customer_remark,customer_job," + "customer_blog,customer_tel,customer_msn,birth_day,customer_addtime, " + "customer_addman,customer_changtime,change_man,customer_company) " + " values(?,?,null,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"; // 获取连接 con = DBCon.getConnection(); // 创建实例 pre = con.prepareStatement(sql); pre.setInt(1, customerInfo.getConditionId()); pre.setInt(2, customerInfo.getSourceId()); //pre.setInt(3, customerInfo.getUserId()); pre.setInt(3, customerInfo.getTypeId()); pre.setString(4, customerInfo.getCustomerName()); pre.setString(5, customerInfo.getCustomerSex()); pre.setString(6, customerInfo.getCustomerMobile()); pre.setString(7, customerInfo.getCustomerQq()); pre.setString(8, customerInfo.getCustomerAddress()); pre.setString(9, customerInfo.getCustomerEmail()); pre.setString(10, customerInfo.getCustomerRemark()); pre.setString(11, customerInfo.getCustomerJob()); pre.setString(12, customerInfo.getCustomerBlog()); pre.setString(13, customerInfo.getCustomerTel()); pre.setString(14, customerInfo.getCustomerMsn()); pre.setString(15, customerInfo.getCustomerBirthday()); pre.setString(16, customerInfo.getCustomerAddTime()); pre.setString(17, customerInfo.getCustomerAddMan()); pre.setString(18, customerInfo.getCustomerChangeTime()); pre.setString(19, customerInfo.getCustomerChangeMan()); pre.setString(20, customerInfo.getCustomerCompany()); // 执行s q l:增加，修改，删除都是用executeUpdate int i = pre.executeUpdate(); if (i > 0) { return true; } } catch (Exception e) { e.printStackTrace(); } finally { try { // 关闭 DBCon.closeCon(con); DBCon.closePre(pre); } catch (Exception e) { e.printStackTrace(); } } return false; } public boolean delete(int customerId) { // 删除 Connection con = null; PreparedStatement pre = null; try { String sql = "update customer_info set is_used = '0' where customer_id =?"; // 获取连接 con = DBCon.getConnection(); // 创建实例 pre = con.prepareStatement(sql); pre.setInt(1, customerId); // 执行s q l:增加，修改，删除都是用executeUpdate int i = pre.executeUpdate(); if (i > 0) { return true; } } catch (Exception e) { e.printStackTrace(); } finally { DBCon.closeCon(con); DBCon.closePre(pre); } return false; } public CustomerInfo getAllList(int customerId) { // 查询一条记录 Connection con = null; PreparedStatement pre = null; ResultSet res = null; try { //多表查询 String sql = "select a.* ,b.condition_name, c.source_name,d.type_name ,e.user_name from customer_info a,customer_condition b, customer_source c,customer_type d,user_info e " +" where a.condition_id=b.condition_id and a.source_id=c.source_id and a.type_id =d.type_id and a.user_id = e.user_id and a.is_used=1 and customer_id =? "; //获取连接 con= DBCon.getConnection(); //创建实例 pre=con.prepareStatement(sql); pre.setInt(1, customerId); res = pre.executeQuery(); if (res.next()) { CustomerInfo customerInfo = new CustomerInfo(); customerInfo.setCustomerId(res.getInt("customer_id")); customerInfo.setCustomerName(res.getString("customer_name")); customerInfo.setConditionId(res.getInt("condition_id")); customerInfo.setCustomerCondition(res.getString("condition_name")); customerInfo.setSourceId(res.getInt("source_id")); customerInfo.setCustomerSource(res.getString("source_name")); customerInfo.setTypeId(res.getInt("type_id")); customerInfo.setCustomerType(res.getString("type_name")); customerInfo.setUserId(res.getInt("user_id")); customerInfo.setCustomerForUser(res.getString("user_name")); customerInfo.setCustomerSex(res.getString("customer_sex")); customerInfo.setCustomerMobile(res.getString("customer_mobile")); customerInfo.setCustomerQq(res.getString("customer_qq")); customerInfo.setCustomerAddress(res.getString("customer_address")); customerInfo.setCustomerEmail(res.getString("customer_email")); customerInfo.setCustomerRemark(res.getString("customer_remark")); customerInfo.setCustomerJob(res.getString("customer_job")); customerInfo.setCustomerBlog(res.getString("customer_blog")); customerInfo.setCustomerTel(res.getString("customer_tel")); customerInfo.setCustomerMsn(res.getString("customer_msn")); customerInfo.setCustomerBirthday(res.getString("birth_day")); customerInfo.setCustomerAddTime(res.getString("customer_addtime")); customerInfo.setCustomerAddMan(res.getString("customer_addman")); customerInfo.setCustomerChangeTime(res.getString("customer_changtime")); customerInfo.setCustomerChangeMan(res.getString("change_man")); customerInfo.setCustomerCompany(res.getString("customer_company")); customerInfo.setIsUsed(res.getString("is_used")); return customerInfo; } } catch (Exception e) { e.printStackTrace(); } finally { DBCon.closeRes(res); DBCon.closePre(pre); DBCon.closeCon(con); } return null; } public List<CustomerInfo> getNoAdmeasure( ) { // 查询未分配的记录 Connection con = null; PreparedStatement pre = null; ResultSet res = null; try { //多表查询 String sql = "select a.* ,b.condition_name, c.source_name,d.type_name from customer_info a,customer_condition b, customer_source c,customer_type d where a.condition_id=b.condition_id and a.source_id=c.source_id and a.type_id =d.type_id and a.is_used=1 and a.user_id is null "; //获取连接 con= DBCon.getConnection(); //创建实例 pre=con.prepareStatement(sql); res = pre.executeQuery(); List< CustomerInfo> list = new ArrayList<CustomerInfo>(); while (res.next()) { CustomerInfo customerInfo = new CustomerInfo(); customerInfo.setCustomerId(res.getInt("customer_id")); customerInfo.setCustomerName(res.getString("customer_name")); customerInfo.setConditionId(res.getInt("condition_id")); customerInfo.setCustomerCondition(res.getString("condition_name")); customerInfo.setSourceId(res.getInt("source_id")); customerInfo.setCustomerSource(res.getString("source_name")); customerInfo.setTypeId(res.getInt("type_id")); customerInfo.setCustomerType(res.getString("type_name")); customerInfo.setUserId(res.getInt("user_id")); customerInfo.setCustomerSex(res.getString("customer_sex")); customerInfo.setCustomerMobile(res.getString("customer_mobile")); customerInfo.setCustomerQq(res.getString("customer_qq")); customerInfo.setCustomerAddress(res.getString("customer_address")); customerInfo.setCustomerEmail(res.getString("customer_email")); customerInfo.setCustomerRemark(res.getString("customer_remark")); customerInfo.setCustomerJob(res.getString("customer_job")); customerInfo.setCustomerBlog(res.getString("customer_blog")); customerInfo.setCustomerTel(res.getString("customer_tel")); customerInfo.setCustomerMsn(res.getString("customer_msn")); customerInfo.set