<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>主页</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form id="form1" name="form1" method="post" action="servlet/YunServlet?method=add"> <p> <label for="name">要做的题数</label> <input type="text" name="num" id="num" /> </p> <p> <input type="submit" name="tijiao" id="tijiao" value="提交" /> </p> </form> </body> </html>
<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>做题页</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form id="form1" name="form1" method="post" action="MyJsp1.jsp"> <% dao.DBUtil db=new dao.DBUtil(); Connection conn =db.getConn(); Statement stmt = conn.createStatement();//从数据库里面取东西对比 ResultSet rs=stmt.executeQuery("select * from yunsuan"); int x=0; while(rs.next()) { x++; int num1=rs.getInt("num1"); int num2=rs.getInt("num2"); String symbol=rs.getString("symbol"); %> <p> <label for="name"><%=num1+symbol+num2 %>=</label> <input type="text" name="<%=x %>" id="<%=x %>" /> </p> <% } %> <p> <input type="submit" name="tijiao" id="tijiao" value="提交" /> </p> </body> </html>
<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>答案页</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <% dao.DBUtil db=new dao.DBUtil(); Connection conn =db.getConn(); Statement stmt = conn.createStatement();//从数据库里面取东西对比 ResultSet rs=stmt.executeQuery("select * from yunsuan"); int x=0; while(rs.next()) { x++; String y=String.valueOf(x); int num1=rs.getInt("num1"); int num2=rs.getInt("num2"); String symbol=rs.getString("symbol"); int find=rs.getInt("find"); if(request.getParameter(y)!=null) { int a=Integer.parseInt(request.getParameter(y)); %> <p> <label for="name"><%=num1+symbol+num2 %>=</label> <table width="75" border="1"> <tr> <td><%=a %></td> </tr> </table> <% if(find==a) { %> 回答正确 <% } else { %> 回答错误,正确答案为<%=find %> <% } %> </p> <% } else { out.print("出错"); } } %> <p> </body> </html>
package servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.Connection; import java.sql.SQLException; import java.util.Random; import java.util.Scanner; import javax.mail.Session; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import dao.Dao; import user.users; public class YunServlet extends HttpServlet { /** * Constructor of the object. */ public YunServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { dao.DBUtil db=new dao.DBUtil(); Connection conn =db.getConn(); Dao open=new Dao(); int num=Integer.parseInt(request.getParameter("num")); //HttpSession session=request.getSession(); //session.setAttribute("num", num); Random r=new Random(); for(int i=0;i<num;i++) { users u=new users(); int r1=r.nextInt(100)+1; int r2=r.nextInt(100)+1; int r3=r.nextInt(4)+1; switch(r3) { case 1: { int x=r1+r2; while(x>100&&x>0) { r1=r.nextInt(100)+1; r2=r.nextInt(100)+1; x=r1+r2; } u.num1=r1; u.num2=r2; u.symbol="+"; u.find=x; try { open.add(conn, u); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } case 2: { int x=r1-r2; while(x>100&&x>0) { r1=r.nextInt(100)+1; r2=r.nextInt(100)+1; x=r1-r2; } u.num1=r1; u.num2=r2; u.symbol="-"; u.find=x; try { open.add(conn, u); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } case 3: { int x=r1*r2; while(x>100&&x>0) { r1=r.nextInt(100)+1; r2=r.nextInt(100)+1; x=r1*r2; } u.num1=r1; u.num2=r2; u.symbol="*"; u.find=x; try { open.add(conn, u); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } case 4: { int x=r1/r2; int root=r1%r2; while(x>100&&root==0&&x>0) { r1=r.nextInt(100)+1; r2=r.nextInt(100)+1; x=r1/r2; root=r1%r2; } u.num1=r1; u.num2=r2; u.symbol="/"; u.find=x; try { open.add(conn, u); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } } } request.getRequestDispatcher("../MyJsp.jsp").forward(request,response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }
以上是四则运算的源码
设计思想:
通过网页输入做题数，和时间，提交到下一个界面。servlet类生成数据存入数据库。做题页提交后到下一个页面显示进行判断对错。