Question

我正在开发一个java测验应用程序。该申请将包含以下表格之一的20个问题：

德语单词xxxx的英文单词是什么？

什么是德语   英语单词xxxx的单词？

我创建了一个带有单词表和页面的数据库，用于向该表添加单词。该表由以下列组成：germanWord，gender，englishWord

我的问题是，在每个问题上，我想从该数据库中随机选择一个单词来形成问题，例如：

英语单词 wordTable.getEnglishName 的德语单词是什么？

最后，问题是一个多项选择题，所以有可能在4个可能的答案之一中插入一个命令来从问题中选择的相同条目中获取相关答案吗？

<input type="radio" name="q1Answer" value="A"/><label for="A">A) fixed answer</label><br/>
<input type="radio" name="q1Answer" value="B"/><label for="B">B) fixed answer</label><br/>
<input type="radio" name="q1Answer" value="C"/><label for="C">C) *get name from the database*</label><br/>
<input type="radio" name="q1Answer" value="D"/><label for="D">D) fixed answer</label><br/><br/>



package org.me.jsp.beans;

import java.sql.*;
import java.util.*;

public class WordDataBean {


    private Connection connection;
    private PreparedStatement addWord, getWords, removeWord, getRandEnglishWord;

    public WordDataBean() throws Exception {

        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/university2", "root",
                    "");

            getWords = connection.prepareStatement("SELECT * FROM word");

            addWord = connection.prepareStatement("INSERT INTO university2.word ( "
                    + "germanName, gender, englishName ) " + "VALUES ( ?, ?, ?);");

            removeWord = connection.prepareStatement("DELETE FROM university2.student "
                    + "WHERE germanName='?';");
            getRandEnglishWord= connection.prepareStatement("SELECT englishName FROM word"
                    + "ORDER BY RAND() LIMIT 1");
        } catch (SQLException sqle) {
            sqle.printStackTrace();
        }

    }

    public List<WordBean> getWordList() throws SQLException {
        List<WordBean> wordList = new ArrayList<WordBean>();

        // obtain list of titles
        ResultSet results = getWords.executeQuery();

        // get row data
        while (results.next()) {
            WordBean word = new WordBean();

            word.setGermanName(results.getString(1));
            word.setGender(results.getString(2));
            word.setEnglishName(results.getString(3));

            wordList.add(word);
        }

        return wordList;
    }

    public void addWord(WordBean word) throws SQLException {
        addWord.setString(1, word.getGermanName());
        addWord.setString(2, word.getGender());
        addWord.setString(3, word.getEnglishName());
        addWord.executeUpdate();
    }

    public void removeWord(WordBean word) throws SQLException{
        removeWord.setString(1,word.getGermanName());
        removeWord.executeUpdate();
    }
    public void randomEnglishWord(WordBean word) throws SQLException{
        getRandEnglishWord.setString(1, word.getEnglishName());
        getRandEnglishWord.executeQuery();
    }
    protected void finalize() {
        try {
            getWords.close();
            addWord.close();
            connection.close();
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
    }
}

以下是一个问题jsp页面的示例，q1.jsp：

<%-- 
    Document   : q1
    Created on : 06-May-2012, 18:54:24
    Author     : encore
--%>

<!--This JSP acts as the first question in a multiple choice quiz, with the user
asked to submit their answer to the question-->

<?xml version = "1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <title>Big Java Quiz, question 1</title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    </head>
    <body>
        <%if(request.getParameter("choice").equals("N"))
            out.print("<meta http-equiv='refresh' content='0;url=options.jsp'/>");
            //Redirects user back to index if they did not want to take quiz%>
        <form action="q2.jsp" method="POST">
            <b>Question 1.</b> What is the German noun for the English word ______?<br/><br/>
            <input type="radio" name="q1Answer" value="A"/><label for="A">A) Exception generator</label><br/>
            <input type="radio" name="q1Answer" value="B"/><label for="B">B) Exception manipulator</label><br/>
            <input type="radio" name="q1Answer" value="C"/><label for="C">C) Exception handler</label><br/>
            <input type="radio" name="q1Answer" value="D"/><label for="D">D) Exception monitor</label><br/><br/>
            <input type="submit" value="Submit"/>
        </form>
    </body>
</html>

Answer 1

假设您将问题提取到列表中：

    List<WordBean> wordList = getWordList();
    List<String> answersList = new ArrayList<String>(); 
    Random random = new Random();
    Random forAnswers = new Random();

    WordBean goodOne = wordList.get(random.nextInt(wordList.size()));
    //take it out from the list
    wordList.remove(goodOne);
    //add it to the answers list
    answersList.add(goodOne.getGermanName());
    WordBean fakeOne = wordList.get(random.nextInt(wordList.size()));
    //take it out from the list
    wordList.remove(fakeOne);
    //add it to the answers list
    answersList.add(fakeOne.getGermanName());
    WordBean fakeTwo = wordList.get(random.nextInt(wordList.size()));
    //take it out from the list
    wordList.remove(fakeTwo);
    //add it to the answers list
    answersList.add(fakeTwo.getGermanName());

    %>What is the english word for the german word <%=goodOne.getGermanName()%>

    <%
    char letter = 'A';
    for (String answer:answersList){
    %>
    <input type="radio" name="q1Answer" value=""/><label for="<%=letter%>"><%=letter%>)<%=answerList.get(forAnswers.getNextInt(3))> />
    <%
    //point to the next letter
    letter++;
    }

具有数据库访问权限的JSP Quiz应用程

1 个答案: