基于Javaweb实现ATM机系统开发实战（九）存款功能实现

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：

 

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>



    
    
    
    
    
    
    

    
    
    

    






    
    
    
    



    
    

        
 
    
    
    

        

            
            

                
                    
                
                
                    
                




                

                    
IMUT ATMv2.2.7
                

            


            
            

                


                    


                       
                        

                            
                          
                        
                    
                    
                    

                    

                
                

                    

                    

                        

    

                    
                    

                        
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IMUT ATMv2.2.7
        

        
            
        
        

            

                
                    
                
            
        

        

            

                
            
        

        

            

                

                    

                    

                        

                                    
                                    用户信息
                                

                        

                        

                            
                                
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                            存款
                            
                        

                    

                    
                    
                
            
            

            
            

                

                    
                
                

                
                
首页
                
                

                
                
存款
                
                
            


            





                    

                        

                        

                            

                             
                                
                                

                            

                            

									


                                    

                                        


                                 

		<%-- 	 --%>

	

		

		
			
		

				
				
${balance }
			
                            

                            

                            请输入存入的金额:
                                               
                                                

                                                   
                                                
                                            

                                            
${error3}
                                                确认
                                                
                                                






























                                            
              
                                        
                                    

                                
                                
                                
                                
                                
                                
                            
                        
                    
                    


                



            


            



            
            

            

                

                

                    

                    

                
                
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 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();

    @Override
    protected 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();
        }

    }
    }
    @Override
    protected 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~

 实现代码已上传~