基于Javaweb实现ATM机系统开发实战（十五）退卡和转账跳转实现
首先创建一个servlet接受和处理请求：
package com.atm.servlet;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
//用户退出
@WebServlet("/logout")
public class ExitServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//销毁session对象，或销毁session中保存的用户数据
// request.getSession().removeAttribute("ua");
request.getSession().invalidate();
response.sendRedirect("/changepage/login.jsp");
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}
对前端页面进行修改：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page language="java"%>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
IMUT_BANK ATM WelCome!!
IMUT BANK借记卡明细对账单
<%
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
request.setAttribute("date_time", df.format(new Date()));
%>
打印日期:${date_time }
卡 号
日 期
货 币
交 易 金 额
账 户 余 额
${user.icno }
${user.rm_date }
${user.rm_currency }
${user.rm_balance }
${user.rm_rest }
<%-- ${requestScope.pageBean.pageNum == 1} --%>
<%--
${pageContext.request.contextPath}/serchDetaile?pageNum=1
--%>
MAIN WIDGET
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
IMUT_BANK ATM WelCome!!
转账
当前账户余额
测试一下效果，发现功能实现啦~
接下来我们实现转账跳转的操作：
package com.atm.servlet;
import com.atm.pojo.RunMessage;
import com.atm.pojo.User;
import com.atm.service.RunMessageService;
import com.atm.service.UserService;
import com.atm.service.impl.RunMessageServiceImpl;
import com.atm.service.impl.UserServiceImpl;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
//用户转账
@WebServlet("/UserTransfer")
public class UserTransferServlet extends HttpServlet {
private UserService userService=new UserServiceImpl();
private RunMessageService runMessageService=new RunMessageServiceImpl();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取相关参数
String icno =request.getParameter("transferIn");
int money=Integer.parseInt(request.getParameter("transferNum"));
//做出相应的业务数据判断
//先判断账户是否存在
User user=null;
try {
user = userService.getUserByIcno(icno);
if(user==null){
request.getSession().setAttribute("error4","转账的账户不存在");
response.sendRedirect("/changepage/UserTransfer.jsp");
}
}catch (Exception e){
e.printStackTrace();
}
//判断转账的金额
//查询当前用户的余额
//拿到当前用户信息
user = (User) request.getSession().getAttribute("ua");
double balance = 0;
try {
balance = userService.getBalance(user.getIcno());
} catch (Exception e) {
e.printStackTrace();
}
if (money == 0) {
request.getSession().setAttribute("error4", "转账金额不能为0");
response.sendRedirect("changepage/UserTransfer.jsp");
} else if (money % 100 != 0) {
request.getSession().setAttribute("error4", "转账金额必须为100的倍数");
response.sendRedirect("changepage/UserTransfer.jsp");
} else if (money > 10000) {
request.getSession().setAttribute("error4", "单次转账金额不能大于10000");
response.sendRedirect("changepage/UserTransfer.jsp");
} else if (money > balance) {
request.getSession().setAttribute("error4", "余额不足");
response.sendRedirect("changepage/UserTransfer.jsp");
}
//执行转账操作
try {
//转出：取款
userService.fetchMoney(money,user.getIcno());
//保存交易记录
SimpleDateFormat sdf=new SimpleDateFormat("YYYY-MM-dd hh:mm:ss");
//查询当前最新的账户余额
double rest= userService.getBalance(user.getIcno());
RunMessage runMessage =new RunMessage();
runMessage.setIcno(user.getIcno());
runMessage.setRm_currency("人民币");
runMessage.setRm_date(sdf.format(new Date()));
runMessage.setRm_balance(-Double.valueOf(money));
runMessage.setRm_rest(rest);
//保存交易记录
runMessageService.addRunMessage(runMessage);
//转入：存款
userService.storeMoney(money,icno);
//保存交易记录
//查询当前最新的账户余额
double restIn= userService.getBalance(icno);
runMessage.setIcno(icno);
runMessage.setRm_currency("人民币");
runMessage.setRm_date(sdf.format(new Date()));
runMessage.setRm_balance(Double.valueOf(money));
runMessage.setRm_rest(restIn);
//保存交易记录
runMessageService.addRunMessage(runMessage);
response.sendRedirect("/changepage/TransferSucc.jsp");
} catch (Exception e) {
request.getSession().setAttribute("error4", "转账失败");
response.sendRedirect("changepage/UserTransfer.jsp");
throw new RuntimeException(e);
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}
也是同样的，对前端页面进行修改：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
Apricot 1.3
转账成功
MAIN WIDGET
效果测试：
实现代码已上传~