今天就做了一个简单的主页面。实现了基本的记账功能。计划明天实现删除指定的记账事件。
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>首页</title> <style> .a{ font-size: 26px; margin-top: 20px; } </style> </head> <body> <div align="center"> <h1 style="color:bluegreen;">记帐本</h1> <div class="a"> <a href="add.jsp">账单记录</a> </div> <div class="a"> <a href="add.jsp">删除账单</a> </div> <div class="a"> <a href="add.jsp">查询账单</a> </div> <div class="a"> <a href="add.jsp">修改账单</a> </div> </div> </body> </html>
这是我的主页显示------
添加账单记录的代码
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>记录账单</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">记账</h1> <form action="BillServlet?method=add" method="post" onsubmit="return check()"> <div class="a"> 类型<input type="text" id="type" name="type"/> </div> <div class="a"> 年<input type="text" id="year" name="year" /> </div> <div class="a"> 月<input type="text" id="month" name="month"/> </div> <div class="a"> 日<input type="text" id="day" name="day"/> </div> <div class="a"> 收入<input type="text" id="income" name="income"/> </div> <div class="a"> 支出<input type="text" id="pay" name="pay"/> </div> <div class="a"> <button type="submit" class="b">注 册</button> </div> <div class="a"> <a href="index.jsp" >返回</a> </div> </form> </div> </body> </html>
连接数据库
package com.bill.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class DBUtil { public static String db_url = "jdbc:mysql://localhost:3306/test?useSSL=false"; public static String db_user = "root"; public static String db_pass = "mm123456"; public static Connection getConn () { Connection conn = null; try { Class.forName("com.mysql.jdbc.Driver");//鍔犺浇椹卞姩 conn = DriverManager.getConnection(db_url, db_user, db_pass); } catch (Exception e) { e.printStackTrace(); } return conn; } public static void close (Statement state, Connection conn) { if (state != null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } public static void close (ResultSet rs, Statement state, Connection conn) { if (rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if (state != null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } }
been层的封装
package com.bill.been; public class Bill { private int id; private String type; private String year; private String month; private String day; private String income; private String pay; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getType() { return type; } public void setType(String type) { this.type = type; } public String getYear() { return year; } public void setYear(String year) { this.year = year; } public String getMonth() { return month; } public void setMonth(String month) { this.month = month; } public String getDay() { return day; } public void setDay(String day) { this.day = day; } public String getIncome() { return income; } public void setIncome(String income) { this.income = income; } public String getPay() { return pay; } public void setPay(String pay) { this.pay = pay; } public Bill(int id,String type,String year,String month,String day,String income,String pay) { this.id=id; this.type=type; this.year=year; this.month=month; this.day=day; this.income=income; this.pay=pay; } public Bill(String type,String year,String month,String day,String income,String pay) { this.type=type; this.year=year; this.month=month; this.day=day; this.income=income; this.pay=pay; } }
dao层调用数据库
package com.bill.dao; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import com.bill.util.DBUtil; import com.bill.been.Bill; @SuppressWarnings("unused") public class BillDao { public boolean add(Bill bill) { String sql = "insert into bill(type,year,month,day,income,pay) values(‘" + bill.getType() + "‘,‘" + bill.getYear() + "‘,‘"+bill.getMonth()+"‘,‘"+bill.getDay()+"‘,‘"+bill.getIncome()+"‘,‘"+bill.getPay()+"‘)"; Connection conn = DBUtil.getConn();//调用方法连接数据库 Statement state = null; boolean f = false; int a = 0 ; try { //监视大括号内的代码 state = conn.createStatement(); a = state.executeUpdate(sql); } catch (Exception e) { //捕获错误 e.printStackTrace(); } finally { //关闭z 连接 DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } }
servlet实现页面和数据库的传递
package com.bill.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.bill.dao.BillDao; import com.bill.been.Bill; @WebServlet("/BillServlet") public class BillServlet extends HttpServlet{ private static final long serialVersionUID = 1L; public BillServlet() { super(); } BillDao dao=new BillDao(); protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("utf-8"); String method = req.getParameter("method"); if ("add".equals(method)) { add(req, resp); } } private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException { // TODO Auto-generated method stub String type = req.getParameter("type"); String year = req.getParameter("year"); String month = req.getParameter("month"); String day = req.getParameter("day"); String income = req.getParameter("income"); String pay = req.getParameter("pay"); Bill bill=new Bill(type,year,month,day,income,pay); if(dao.add(bill)) { req.setAttribute("message", "保存成功!"); req.getRequestDispatcher("add.jsp").forward(req, resp); }else { req.setAttribute("message", "保存失败!"); req.getRequestDispatcher("add.jsp").forward(req, resp); } } }
最后的结果显示如下
原文：https://www.cnblogs.com/birdmmxx/p/10386267.html