基于Javaweb实现ATM机系统开发实战（九）存款功能实现-编程知识

先看前端界面确定后端需要处理的参数，把一些参数进行修改：

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id="toggle"><span class="entypo-menu"></span></a><div class="dark"><form action="#"><span><input type="text" name="search" value="" class="search rounded id_search" placeholder="Search Menu..." autofocus=""></span></form></div><div class="search-hover"><form id="demo-2"><input type="search" placeholder="Search Menu..." class="id_search"></form></div><div class="skin-part"><div id="tree-wrap"><div class="side-bar"><ul class="topnav menu-left-nest"><li><a class="tooltip-tip2 ajax-load" href="/changepage/UserIndex.jsp" title="Profile Page"><i class="icon-user"></i><span>用户信息</span></a></li><li><a class="tooltip-tip" href="/changepage/UserChangePwd.jsp" title="Extra Pages"><i class="icon-lock"></i><span>修改密码</span></a><li><a class="tooltip-tip2 ajax-load" href="/UserSerch" title="Blank Page"><i class="icon-media-record"></i><span>查询余额</span></a></li><li><a class="tooltip-tip2 ajax-load" href="/changepage/UserStore.jsp" title="Invoice"><i class="entypo-newspaper"></i><span>存款</span></a></li><li><a class="tooltip-tip2 ajax-load" href="/changepage/UserFetch.jsp" title="Pricing Table"><i class="fontawesome-money"></i><span>取款</span></a></li><li><a class="tooltip-tip2 ajax-load" href="/changepage/UserTransfer.jsp" title="Time Line"><i class="entypo-clock"></i><span>转账</span></a></li><li><a class="tooltip-tip2" href="/serchDetaile" title="404 Error Page"><i class="icon-preview"></i><span>交易明细</span></a></li><li><a class="tooltip-tip2" href="/changepage/login.jsp" title="login.jsp"><i class="icon-mail"></i><span>退卡</span></a></li></ul></div></div></div></div><!-- END OF SIDE MENU --><!--  PAPER WRAP --><div class="wrap-fluid"><div class="container-fluid paper-wrap bevel tlbr"><!-- CONTENT --><!--TITLE --><div class="row"><div id="paper-top"><div class="col-sm-3"><h2 class="tittle-content-header"><span class="entypo-newspaper"></span><span>存款</span></h2></div></div></div><!--/ TITLE --><!-- BREADCRUMB --><ul id="breadcrumb"><li><span class="entypo-home"></span></li><li><i class="fa fa-lg fa-angle-right"></i></li><li><a href="#" title="Sample page 1">首页</a></li><li><i class="fa fa-lg fa-angle-right"></i></li><li><a href="#" title="Sample page 1">存款</a></li></ul><!-- END OF BREADCRUMB --><div class="row"><div class="col-sm-12"><!-- BLANK PAGE--><div class="nest" id="Blank_PageClose"><div class="title-alt"><!--    <h6>当前账户余额</h6> --></div><div class="body-nest" id="Blank_Page_Content"><div class="form_center"><form action="/UserStore" id="contact-form" class="form-horizontal" method="post"><fieldset><table width="10%" border='2'><tr align="center"><br><!-- <th><font size="4" >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;当&nbsp;&nbsp;前&nbsp;&nbsp;余&nbsp;&nbsp;额&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font></th> --></tr><%-- 	<tr align="center"><td><font size="2">${balance }</font></td></tr> --%></table><div class="form-actions" style="margin:20px 0 0 0;"><div class="control-group"><label class="control-label" for="get">请输入存入的金额:</label><!--  <div class="controls"><input type="text" class="form-control" name="account" id="account"></div> --><div class="controls"><input type="text" class="form-control" name="saveNum" id="get"></div></div><br><p style="color:red;font-size: 14px" >${error3}</p><button type="submit" class="btn btn-primary" onclick="alert('确认存入吗？')">确认</button><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>              </fieldset></form></div></div></div></div><!-- END OF BLANK PAGE --></div><!-- /END OF CONTENT --><!-- FOOTER --><div class="footer-space"></div><div id="footer"><div class="devider-footer-left"></div><div class="time"><p id="spanDate"><p id="clock"></div><div class="copyright">本网站基于百度查询开发 <a href="http://www.baidu.com/" title="百度" target="_blank">百度</a> All Rights Reserved</div><div class="devider-footer"></div></div><!-- / END OF FOOTER --></div></div><!--  END OF PAPER WRAP --><!-- RIGHT SLIDER CONTENT --><!-- END OF RIGHT SLIDER CONTENT--><!-- MAIN EFFECT --><script type="text/javascript" src="assets/js/preloader.js"></script><script type="text/javascript" src="assets/js/bootstrap.js"></script><script type="text/javascript" src="assets/js/app.js"></script><script type="text/javascript" src="assets/js/load.js"></script><script type="text/javascript" src="assets/js/main.js"></script></body></html>

根据前端的地址创建servlet：

package com.atm.servlet;import com.atm.pojo.User;
import com.atm.service.UserService;
import com.atm.service.impl.UserServiceImpl;import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;//用户存款
@WebServlet("/UserStore")
public class UserStoreServlet extends HttpServlet {private UserService userService=new UserServiceImpl();@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {User user=(User) request.getSession().getAttribute("ua");int money=Integer.parseInt(request.getParameter("saveNum"));if(money ==0){request.getSession().setAttribute("error3","存款金额不能为0");response.sendRedirect("changepage/UserStore.jsp");} else if (money%100!=0) {request.getSession().setAttribute("error3","存款金额必须为100的倍数");response.sendRedirect("changepage/UserStore.jsp");} else if (money>10000) {request.getSession().setAttribute("error3","存款金额不能大于10000");response.sendRedirect("changepage/UserStore.jsp");}else {try{userService.storeMoney(money,user.getIcno());response.sendRedirect("/UserSerch");}catch (Exception e){request.getSession().setAttribute("error3","存款失败");response.sendRedirect("changepage/UserStore.jsp");e.printStackTrace();}}}@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request,response);}}

接口实现：

//用户存款public void storeMoney(int money,String icno)throws Exception;

实现类实现：

//用户存款public void storeMoney(int money,String icno)throws Exception{userDao.storeMoney(money,icno);}

数据层：

    //用户存款public void storeMoney(int money,String icno) throws Exception{Connection connection=DBUtils.getConnection();PreparedStatement preparedStatement = connection.prepareStatement("update user set balance=balance+? where icno=?");preparedStatement.setInt(1,money);preparedStatement.setString(2,icno);preparedStatement.executeUpdate();DBUtils.release(connection,preparedStatement,null);}

重启系统，发现功能实现啦~