四则运算1
设计思想：在.java文件中创建随机数，组成一个运算式，计算答案为String类型，方便分数的判断。传递到jsp页面中进行判断，判断输入结果与正确结果是否相匹配，提交以后显示题目的正确结果。
源代码：
Add.java
package com.jaovo.msg.dao; import com.jaovo.msg.model.Math_Message; public interface Add { public void add(Math_Message math); }
ChangeType.java
package com.jaovo.msg.dao; import com.jaovo.msg.dao.Count; import com.jaovo.msg.dao.Mathimpl; import com.jaovo.msg.model.Math_Message; public class ChangeType { public String [] changetype() { String []change=new String[30]; for(int i=0;i<30;i++) { Math_Message math=new Math_Message(); Count count=new Count(); math=count.count(); Mathimpl add=new Mathimpl(); if(math.getResult().length()>2) { if(math.getNumber1()<math.getNumber2()) { if(math.getOperator().equals("÷")) { change[i]=Integer.toString(math.getNumber1())+math.getOperator()+Integer.toString(math.getNumber2())+"="; add.add(math);//将一个正确的算术式添加到数据库 } else { i=i-1; } } else { i=i-1; } } else if(Integer.parseInt(math.getResult())<0) { i=i-1; } else { change[i]=Integer.toString(math.getNumber1())+math.getOperator()+Integer.toString(math.getNumber2())+"="; add.add(math);//将一个正确的算术式添加到数据库 } } return change; } }
Count .java
package com.jaovo.msg.dao; import com.jaovo.msg.model.Math_Message; public class Count { //计算最大公约数函数方法 public static int maxCommonDivisor2(int m, int n) { if (m < n) {// 保证m>n,若m<n,则进行数据交换 int temp = m; m = n; n = temp; } while (m % n != 0) {// 在余数不能为0时,进行循环 int temp = m % n; m = n; n = temp; } return n;// 返回最大公约数 } //生成随机数并计算出结果 public Math_Message count() { int number1,number2=0;//暂时存放产生的两个随机数，以便于计算正确结果 int operator;//产生0-3的随机数代表四个运算符 String result;//计算出正确结果 number1=(int) (Math.random()*100); while(number2==0) { number2=(int) (Math.random()*100); } Math_Message math=new Math_Message() ; math.setNumber1(number1); math.setNumber2(number2); operator=(int) (Math.random()*4); if(operator==0) { math.setOperator("+"); result=Integer.toString(number1+number2); math.setResult(result); } else if(operator==1) { math.setOperator("-"); result=Integer.toString(number1-number2); math.setResult(result); } else if(operator==2) { math.setOperator("*"); result=Integer.toString(number1*number2); math.setResult(result); } else if(operator==3) { if(number1%number2==0)//可以除尽 { math.setOperator("÷"); result=Integer.toString(number1/number2); math.setResult(result); } else //无法除尽的结果 { int pubnumber; math.setOperator("÷"); //求最大公约数 pubnumber= maxCommonDivisor2(number1,number2); number1=number1/pubnumber; number2=number2/pubnumber; result=Integer.toString(number1)+"/"+Integer.toString(number2); math.setResult(result); } } return math; } }
Mathimpl.java
package com.jaovo.msg.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import com.jaovo.msg.model.Math_Message; import com.jaovo.msg.Util.DBUtil; public class Mathimpl implements Add{ @Override public void add(Math_Message math) { //获得链接对象 Connection connection = DBUtil.getConnection(); //准备sql语句 String sql = "select count(*) from math_user where number1 = ?"; //创建语句传输对象 PreparedStatement preparedStatement = null; ResultSet resultSet = null; try { sql = "insert into math_user(number1,number2,operator,result) value (?,?,?,?)"; preparedStatement = connection.prepareStatement(sql); preparedStatement.setInt(1, math.getNumber1()); preparedStatement.setInt(2, math.getNumber2()); preparedStatement.setString(3,math.getOperator()); preparedStatement.setString(4, math.getResult()); preparedStatement.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { //关闭资源 DBUtil.close(resultSet); DBUtil.close(preparedStatement); DBUtil.close(connection); } } }
Read.java
package com.jaovo.msg.dao; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Connection; import java.sql.PreparedStatement; public class Read { public String[] YunSuanResult() { java.sql.Connection connection=null; String user = "root"; String password="root"; int i=0; String[] a=new String[30]; String url="jdbc:mysql://localhost:3306/jaovo_msg"; String qingchu="truncate table math_user"; try { Class.forName("com.mysql.jdbc.Driver").newInstance(); } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { connection = DriverManager.getConnection(url,user,password); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } PreparedStatement preparedStatement=null; ResultSet resultSet=null; String operation="select * from math_user order by id"; try { preparedStatement=connection.prepareStatement(operation); resultSet=preparedStatement.executeQuery(); while(resultSet.next()) { a[i]=resultSet.getString("result"); i++; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { preparedStatement=connection.prepareStatement(qingchu); preparedStatement.executeUpdate(); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } finally {try { resultSet.close(); preparedStatement.close(); connection.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return a; } }
Math_Message.java
package com.jaovo.msg.model; public class Math_Message { private int number1; private int number2; private String operator; private String result; public String getResult() { return result; } public void setResult(String result) { this.result = result; } public int getNumber1() { return number1; } public void setNumber1(int number1) { this.number1 = number1; } public int getNumber2() { return number2; } public void setNumber2(int number2) { this.number2 = number2; } public String getOperator() { return operator; } public void setOperator(String operator) { this.operator = operator; } }
DBUtil.java
package com.jaovo.msg.Util; import java.sql.*; public class DBUtil { public static Connection getConnection() { try { //1 �������� Class.forName("com.mysql.jdbc.Driver").newInstance(); } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } String user = "root"; String password = "root"; String url = "jdbc:mysql://localhost:3306/jaovo_msg"; Connection connection = null; try { //2 �������Ӷ���connection connection = DriverManager.getConnection(url,user,password); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return connection; } //�ر���Դ�ķ��� public static void close(Connection connection ) { try { if (connection != null) { connection.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static void close(PreparedStatement preparedStatement ) { try { if (preparedStatement != null) { preparedStatement.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static void close(ResultSet resultSet ) { try { if (resultSet != null) { resultSet.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
UserException.java
package com.jaovo.msg.Util; public class UserException extends RuntimeException{ public UserException() { super(); // TODO Auto-generated constructor stub } public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) { super(message, cause, enableSuppression, writableStackTrace); // TODO Auto-generated constructor stub } public UserException(String message, Throwable cause) { super(message, cause); // TODO Auto-generated constructor stub } public UserException(String message) { super(message); // TODO Auto-generated constructor stub } public UserException(Throwable cause) { super(cause); // TODO Auto-generated constructor stub } }
show.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@page import="com.jaovo.msg.dao.ChangeType" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>小学100以内四则运算界面</title> </head> <body> <%-- <%Map<String,String> errorMsg = (Map<String,String>)request.getAttribute("errormsg"); --%> <%-- %> --%> <% ChangeType change=new ChangeType(); String []math=new String[30]; math=change.changetype(); %> <form action="showInput.jsp" method="get"> <table align="center" border="1" width="500"> <% String []result=new String[30]; for(int i=0;i<30;i++) { %> <tr> <td><% out.println(math[i]);%></td> <td> <input type="text" name="result"> </td> </tr> <% } %> <tr align="center"> <td> <input type="submit" value="提交" /> </td> </tr> </table> </form> </body> </html>
showInput.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@page import="com.jaovo.msg.Util.DBUtil" import=" java.sql.*" import="com.jaovo.msg.Util.UserException" import="com.jaovo.msg.dao.Read"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <% //接收客户端传递过来的参数 String []result1=new String[30]; result1 = request.getParameterValues("result"); String string=" "; String []kresult=new String[30]; Read read=new Read(); kresult=read.YunSuanResult(); for(int i=0;i<30;i++) { if(result1[i].equals(kresult[i])) { string="√"; } else { string="×"; } %> <h2> 答案是：<% out.print(kresult[i]); out.print("你的结果:"+result1[i]+"是"+string+"的");%></h2> <% } %> </html>
