JavaWeb期末项目设计业务逻辑与实现

1、JavaWeb期末项设计业务逻辑与实现1.1业务逻辑设计与实现业务逻辑层主要由控制层实现，需要实现的需求：登陆注册：RegisterController:package com.dpqq.springboot.web.controller;import com.dpqq.springboot.web.Entity.User;import com.dpqq.springboot.web.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springf

2、ramework.stereotype.Controller;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestParam;import java.util.Map;Controllerpublic class RegisterController AutowiredUserRepository userRepository;PostMapping(value = /register)public String regi

3、ster(RequestParam(name) String name, String gender,RequestParam(phone) String phone,RequestParam(password) String password,Map map)/判断数据合法性if(name.length()4 | name.isEmpty()map.put(warning1, 4);if(password.length()16 | password.length()8)map.put(warning2, 816);if(phone.length()!=11)map.put(warning3,

4、 11);if(userRepository.existsByPhone(phone)map.put(warning3, );if(!isNumeric(phone)map.put(warning3, );if(gender=null)map.put(warning4, );合法则设置户信息并保存数据库if(map.isEmpty()/User user = new User();user.setPassword(password);user.setPhone(phone);user.setName(name);user.setGender(gender);userRepository.sav

5、e(user);return login;/不合法返回注册页elsereturn register;/判断字符串是否是数字函数public static boolean isNumeric(String str)for (int i =0;istr.length();i+)if(!Character.isDigit(str.charAt(i)return false;return true;package com.dpqq.springboot.web.controller;import com.dpqq.springboot.web.Entity.User;import com.dpqq.s

6、pringboot.web.repository.CardRepository;import com.dpqq.springboot.web.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bi

7、nd.annotation.RequestParam;import javax.servlet.http.HttpSession;import java.util.Map;Controllerpublic class LoginController AutowiredUserRepository userRepository;AutowiredCardRepository cardRepository;PostMapping(value = /user/login)public String login(RequestParam(phone) String phone,RequestParam

8、(password) String password,Map map, HttpSession session)/判断数据合法性if(password.length()16 | password.length()8)map.put(warning2, 816);if(phone.length()!=11)map.put(warning1, 11);/数据合法进步判断，不合法返回登录页if(map.isEmpty() 判断是否存在机号密码匹配，存在即登陆可以登陆重定向页，不存在返回登录页if (userRepository.existsByPhoneAndPassword(phone, pass

9、word) User user = userRepository.findByPhone(phone);/session中存放户信息session.setAttribute(loginUser,user);return redirect:/; else map.put(msg, );return login;elsereturn login;办卡：CardAddController:package com.dpqq.springboot.web.controller;import com.dpqq.springboot.web.Entity.Card;import com.dpqq.sprin

10、gboot.web.Entity.User;import com.dpqq.springboot.web.repository.CardRepository;import com.dpqq.springboot.web.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PostMa

11、pping;import org.springframework.web.bind.annotation.RequestParam;import javax.servlet.http.HttpSession;import java.util.Date;import java.util.Map;import java.util.UUID;Controller / 表这是个控制器类public class CardAddController Autowiredprivate CardRepository cardRepository;Autowiredprivate UserRepository

12、userRepository;/ RequestMapping(/ method = RequestMethod.POST/)PostMapping(value = /CardAdd)/ 接受前台发送的数据public String CardAdd(RequestParam(cardpassword) String cardpassword ,RequestParam(phone) String phone ,RequestParam(password) String password,Map map ,HttpSession session)/判断数据合法性if(cardpassword.l

13、ength()16 | cardpassword.length()16 | password.length()8)map.put(warning3, 816);if(phone.length()!=11)map.put(warning2, 11);/合法则再数据库增加卡信息if(map.isEmpty()通过输的机号和密码判断是否存在，否则返回申请页if(userRepository.existsByPhoneAndPassword(phone, password)User user=new User();user=userRepository.findByPhone(phone);Card

14、card=new Card();String CardNum=getUUID(); / 16位卡号/设置户和卡的信息，最后保存进数据库user.setCard(CardNum);card.setCardNum(CardNum);card.setCardpassword(cardpassword);card.setDate(new Date();card.setBalance(0);cardRepository.save(card);userRepository.save(user);/session中User loginUser = (User)session.getAttribute(log

15、inUser);Card loginUserCard=cardRepository.findByCardNum(loginUser.getCard();session.setAttribute(loginUserCard,loginUserCard);map.put(CardNum,CardNum);return ApplyCardSuccess;elsemap.put(msg, );return CardApply;else return CardApply;/成/ 16位唯性的订单号public static String getUUID()/随机成位整数int random = (int

16、) (Math.random()*9+1);String valueOf = String.valueOf(random);/uuidhashCode值int hashCode = UUID.randomUUID().toString().hashCode();/可能为负数if(hashCode0)hashCode = -hashCode;String value = valueOf + String.format(%015d, hashCode);return value;存钱savemoneyController:package com.dpqq.springboot.web.contro

17、ller;import com.dpqq.springboot.web.Entity.Card;import com.dpqq.springboot.web.Entity.User;import com.dpqq.springboot.web.repository.CardRepository;import com.dpqq.springboot.web.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereo

18、type.Controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import javax.servlet.http.HttpSession;import java.util.Map;Controllerpublic class SaveMoneyController AutowiredUserRepository userRepository;AutowiredCardRepository ca

19、rdRepository;GetMapping(value = savemoney)public String savemoney(HttpSession session, Map map)/session中是否有户信息，没有则不能存钱，返回页if(session.getAttribute(loginUser)=null)return /;有户信息进步判断有没有办卡else取出户信息User user=(User)session.getAttribute(loginUser);判断办卡与否，没办卡跳转办卡页，否则进存钱页if(user.getCard()=null)map.put(msg, )

20、; return CardApply;else Card card=cardRepository.findByCardNum(user.getCard();session.setAttribute(loginUserCard,card);return savemoney ;PostMapping(value = /Tosavemoney)public String savemoney( String balance,Map map,HttpSession session)/判断数据合法性if(balance.isEmpty()map.put(warning, ); if(!isNumeric(

21、balance)map.put(warning, ); if(map.isEmpty()/session中取登陆后的户信息，所以需判断数据库中是否存在要素，取出户信息后直接与输的账户卡号进转账操作User user=(User)session.getAttribute(loginUser);获取户信息中的卡号/Card card=cardRepository.findByCardNum(user.getCard();设置卡的额card.setBalance(card.getBalance()+Integer.parseInt(balance);保存进数据库，更新额cardRepository.

22、save(card);return savemoneySuccess;return savemoneySuccess;/数据不合法返回存钱页else return savemoney;/判断字符串是否是数字函数public static boolean isNumeric(String str)for (int i =0;istr.length();i+)if(!Character.isDigit(str.charAt(i)return false;return true;转账TranferAccountController:package com.dpqq.springboot.web.co

23、ntroller;import com.dpqq.springboot.web.Entity.Card;import com.dpqq.springboot.web.Entity.User;import com.dpqq.springboot.web.repository.CardRepository;import com.dpqq.springboot.web.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.st

24、ereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import javax.servlet.http.HttpSession;import java.util.Map;Controllerpublic class SaveMoneyController AutowiredUserRepository userRepository;AutowiredCardRepositor

25、y cardRepository;GetMapping(value = savemoney)public String savemoney(HttpSession session, Map map)/session中是否有户信息，没有则不能存钱，返回页if(session.getAttribute(loginUser)=null)return /;有户信息进步判断有没有办卡else取出户信息User user=(User)session.getAttribute(loginUser);判断办卡与否，没办卡跳转办卡页，否则进存钱页if(user.getCard()=null)map.put(ms

26、g, ); return CardApply;else Card card=cardRepository.findByCardNum(user.getCard();session.setAttribute(loginUserCard,card);return savemoney ;PostMapping(value = /Tosavemoney)public String savemoney( String balance,Map map,HttpSession session)/判断数据合法性if(balance.isEmpty()map.put(warning, ); if(!isNume

27、ric(balance)map.put(warning, ); if(map.isEmpty()/session中取登陆后的户信息，所以需判断数据库中是否存在要素，取出户信息后直接与输的账户卡号进转账操作User user=(User)session.getAttribute(loginUser);获取户信息中的卡号/Card card=cardRepository.findByCardNum(user.getCard();设置卡的额card.setBalance(card.getBalance()+Integer.parseInt(balance);保存进数据库，更新额cardReposit

28、ory.save(card);return savemoneySuccess;/数据不合法返回存钱页else return savemoney;/判断字符串是否是数字函数public static boolean isNumeric(String str)for (int i =0;istr.length();i+)if(!Character.isDigit(str.charAt(i)return false;return true;销户CancellationController:package com.dpqq.springboot.web.controller;import com.dp

29、qq.springboot.web.Entity.Card;import com.dpqq.springboot.web.Entity.User;import com.dpqq.springboot.web.repository.CardRepository;import com.dpqq.springboot.web.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;im

30、port org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import javax.servlet.http.HttpSession;import java.util.Map;Controllerpublic class SaveMoneyController AutowiredUserRepository userRepository;AutowiredCardRepository cardRepository;GetMa

31、pping(value = savemoney)public String savemoney(HttpSession session, Map map)/session中是否有户信息，没有则不能存钱，返回页if(session.getAttribute(loginUser)=null)return /;if(session.getAttribute(loginUser)=null)return /;/有户信息进步判断有没有办卡else取出户信息User user=(User)session.getAttribute(loginUser);判断办卡与否，没办卡跳转办卡页，否则进存钱页if(us

32、er.getCard()=null)map.put(msg, ); return CardApply;else Card card=cardRepository.findByCardNum(user.getCard();session.setAttribute(loginUserCard,card);return savemoney ;PostMapping(value = /Tosavemoney)public String savemoney( String balance,Map map,HttpSession session)/判断数据合法性if(balance.isEmpty()ma

33、p.put(warning, ); if(!isNumeric(balance)map.put(warning, ); if(map.isEmpty()/session中取登陆后的户信息，所以需判断数据库中是否存在要素，取出户信息后直接与输的账户卡号进转账操作User user=(User)session.getAttribute(loginUser);获取户信息中的卡号/Card card=cardRepository.findByCardNum(user.getCard();设置卡的额card.setBalance(card.getBalance()+Integer.parseInt(ba

34、lance);保存进数据库，更新额cardRepository.save(card);return savemoneySuccess;/数据不合法返回存钱页else return savemoney;/判断字符串是否是数字函数public static boolean isNumeric(String str)for (int i =0;istr.length();i+)if(!Character.isDigit(str.charAt(i)return false;return true;1.2表现层设计与实现表现层thtmeleaf模板引擎，导bootstrap的 webjars,使其中的c

35、ss：1.3项难点及解决案问题报错1：JPARepository中动定义查询法的驼峰命名不是分理解深刻，只知道单词中间写会变成下划线加写，当我有个字段中间有写单词时，编写JPARepository定义法时报错。解决案：我概知道错误，就把实体类中字段改成写，再把数据库表删除，重新启动则运通过。问题难点2：编写MvcConfig配置类时，在上看到的时配置WebMvcConfigAdapter,但是我像实现这个接是显法弃。解决案：尝试webmvcConfig实现，发现这个与WebMvcConfigAdapter可实现的法致，得到解决。1.4典型代码段与设计过程配置拦截器：package ponent

36、;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/配置拦截器，重写拦截器必要法public class ApplyCardHandlerInterceptor implements HandlerInterceptorOverride /重写法

37、/ Boolean 通与不通public boolean preHandle(HttpServletRequest request,HttpServletResponse response,Object handler) throws Exception /Session“loginUser”userObject user=request.getSession().getAttribute(loginUser);判断取值是否为空，为空则表没有登陆，跳转回登录页，否则表登陆了，放if(user = null)request.setAttribute(msg, );request.getReque

38、stDispatcher(/login).forward(request,response);return false;elsereturn true;Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws ExceptionOverridepublic void afterCompletion(HttpServletRequest request, HttpServletR

39、esponse response, Object handler, Exception ex) throws Exception MvcConfig添加拦截器：package ponent;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/配置拦

40、截器，重写拦截器必要法public class ApplyCardHandlerInterceptor implements HandlerInterceptorOverride /重写法/ Boolean 通与不通public boolean preHandle(HttpServletRequest request,HttpServletResponse response,Object handler) throws Exception /Session“loginUser”userObject user=request.getSession().getAttribute(loginUser

41、);判断取值是否为空，为空则表没有登陆，跳转回登录页，否则表登陆了，放if(user = null)request.setAttribute(msg, );request.getRequestDispatcher(/login).forward(request,response);return false;elsereturn true;Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView

42、) throws ExceptionOverridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception DuridConfig配置durid数据源:package com.dpqq.springboot.web.config;import com.alibaba.druid.pool.DruidDataSource;import com.alibaba.druid.support.h