voter.jsp

手机程序在线投票的例子

<%! 
	private int totalVotes = 0;
	private double average = 0;
	private int[] votes = new int[5];
	private String[] choices = new String[5];

%><%
	// initialize array
	choices[0] = "Poor";
	choices[1] = "Fair";
	choices[2] = "Good";
	choices[3] = "Great";
	choices[4] = "Awesome";
		

	String sChoice = request.getParameter("choice");
	if ( sChoice != null )
	{
	   int iChoice = 0;
	   
	   try
	   {
	   	iChoice = Integer.parseInt(sChoice);
	   	
	   	if ( iChoice < choices.length)
	   	{
			// increment the vote tally for that choice
			votes[iChoice]++;
			totalVotes++;

			int sum = 0;

			for ( int i = 0; i < choices.length; i++)
			{
			   sum = sum +  (i+1) * votes[i];
			}

			average = (1.0 * sum) / totalVotes;
		}
	   }
	   catch (NumberFormatException nfe)
	   {
	        // bad votes are not counted
	   }
	}
	
	// output the vote results
	StringBuffer voteResults = new StringBuffer();
	
	String sAverage = ""+ average;
	
	voteResults.append("<vote-example>\n");
	voteResults.append("	<votes>\n");
	voteResults.append("		<number>"+ totalVotes +"</number>\n");
	voteResults.append("		<average>"+ sAverage.substring(0,3) +"</average>\n");
	voteResults.append("		<choices>\n");

	for ( int j = 0; j < choices.length; j++)
	{
		voteResults.append("			<choice>\n");
		voteResults.append("				<name>"+ choices[j] +"</name>\n");
		voteResults.append("				<number>"+ votes[j] +"</number>\n");
		voteResults.append("				<value>"+ j +"</value>\n");
		voteResults.append("			</choice>\n");
	}
	
	voteResults.append("		</choices>\n");
	voteResults.append("	</votes>\n");
	voteResults.append("</vote-example>\n");
	
	out.println(voteResults.toString() );
%>