使用JSP技術(shù)實(shí)現(xiàn)一個(gè)簡單的在線測試系統(tǒng)的實(shí)例詳解

center>
	h2>在線測試系統(tǒng)/h2>
	p>
		a href="Index.jsp" rel="external nofollow" >登錄/a>
		|
		a href="test.jsp" rel="external nofollow" >在線測試/a>
		|
		a href="scorelist.jsp" rel="external nofollow" >成績榜/a>
	/p>
/center>

%!int pageCount = 0;%>
% pageCount++; %>
center>
 p>Copyright @ 2018 | 訪問次數(shù)：%=pageCount%>/p>
/center>

!DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>Insert title here/title>
/head>
body>
jsp:include page="Header.jsp" />
center>
form action="check.jsp" method="get">
用戶名input type="text" name="username" />
br>
密碼input type="password" name="psd" />
br>br>
button type="submit">登錄/button>
button type="reset">重填/button>
/center>
jsp:include page="Footer.jsp" />
/form>
/body>
/html>

%!
MapString,String> userlist= new HashMapString,String>();
%>
 
%
userlist.put("qq", "11");
userlist.put("ww","22");
userlist.put("ee","33");
%>
 
%!
boolean check(String username,String psd){
	if(userlist.containsKey(username)){
		if(userlist.get(username).equals(psd)){
			return true;
		}
	}
	
	return false;
}
 
%>
 
 
%
String username=request.getParameter("username");
String psd=request.getParameter("psd");
if(check(username,psd)){
	session.setAttribute("username", username);
	
	out.print("歡迎"+username);
	out.print("a href='test.jsp'>開始測試/a>");
}
else{
	out.print("登陸失敗，3秒鐘后重新登錄");
	response.setHeader("refresh", "3;url='Index.jsp'");
}
 
%>

%
String username=(String)session.getAttribute("username"); 
if(username==null){
	out.print("未登陸，3秒鐘后重新登錄");
	response.setHeader("refresh", "3;url='Index.jsp'");
}
else{
	%>
	
	考生:%=session.getAttribute("username") %>
 
h3>在線測試題/h3>
form action="submit.jsp" onsubmit="return confirm('確定提交嗎？')">
		第1題：湖北省會是
		input type="text" name="q1" />
		br>br>
		第2題：宋朝開國皇帝是
		br>
		input type="radio" value="趙匡胤" name="q2">
		趙匡胤
		input type="radio" value="朱元璋" name="q2">
		朱元璋
		input type="radio" value="李淵" name="q2">
		李淵
		br>br>
		第3題：四大名著有
		br>
		input type="checkbox" value="紅樓夢" name="q3">
		紅樓夢
		input type="checkbox" value="水滸傳" name="q3">
		水滸傳
		input type="checkbox" value="J2EE編程技術(shù)" name="q3">
		J2EE編程技術(shù)
		br>br>
		button type="submit">提交/button>
/form>
	
%}%>

%!
MapString, Integer> score_list = new HashMapString, Integer>(); //存放用戶名+成績 
%>
%
int score=0;
String q1=request.getParameter("q1");
String q2=request.getParameter("q2");
String[] q3=request.getParameterValues("q3");
 
if(q1!=nullq1.equals("武漢")){	score+=10;	}
if(q2!=nullq2.equals("趙匡胤")){	score+=10;	}
if(q3!=nullq3.length==2q3[0].equals("紅樓夢")q3[1].equals("水滸傳")){
	score+=10;	}
//out.print("h2>你的成績=" + score + "/h2>");
 
score_list.put((String)session.getAttribute("username"), score);
application.setAttribute("scorelist", score_list);
response.sendRedirect("logout.jsp");
%>

h1>成績榜/h1>
%!
//降序排序
public K, V extends Comparable? super V>> MapK, V> sortByValueDescending(MapK, V> map)
 {
  ListMap.EntryK, V>> list = new LinkedListMap.EntryK, V>>(map.entrySet());
  Collections.sort(list, new ComparatorMap.EntryK, V>>()
  {
   
   public int compare(Map.EntryK, V> o1, Map.EntryK, V> o2)
   {
    int compare = (o1.getValue()).compareTo(o2.getValue());
    return -compare;
   }
  });
 
  MapK, V> result = new LinkedHashMapK, V>();
  for (Map.EntryK, V> entry : list) {
   result.put(entry.getKey(), entry.getValue());
  }
  return result;
 }
%>
%
if(application.getAttribute("scorelist")==null){
	out.print("h3>沒有成績/h3>");
}
else{ //遍歷顯示所有成績（Map遍歷）
	MapString, Integer> score_list= (MapString, Integer>)application.getAttribute("scorelist");
	score_list=sortByValueDescending(score_list);
	Set s=score_list.keySet();
	Iterator it=s.iterator();
	while(it.hasNext()){
		String username=(String)it.next();
		int score=score_list.get(username);
		out.print("h3>"+username+":"+score+"/h3>");
	}	
}
%>