xmlutil.java

手机程序在线投票的例子

package com.itpath.examples.voter.util;

import com.itpath.examples.voter.*;

import java.io.*;
import java.util.*;

import org.kxml.*;
import org.kxml.kdom.*;
import org.kxml.io.*;
import org.kxml.parser.*;

public class XMLUtil
{
    public static VoteSummary getVoteResults(InputStreamReader insr) throws IOException
    {
		/* xml format

			<vote-example>
				<votes>
					<number>100</number>
					<average>4.5</average>
					<choices>
						<choice>
							<name>Awesome</name>
							<number>43</number>
							<value>1</value>
						</choice>
						<choice>
							<name>Great</name>
							<number>43</number>
							<value>2</value>
						</choice>
						...
					</choices>
				</votes>
			</vote-example>
		*/

        Vector returnVector = new Vector();

        XmlParser parser = new XmlParser (insr);

        Document document = new Document();
        document.parse( parser );

        //document.write( new XmlWriter( new OutputStreamWriter( System.out) ) );

        Element voteExampleElement = document.getElement("vote-example");

        Element voteElement = voteExampleElement.getElement("votes");

        String numVotes = getTextFromElement(voteElement, "number");
        String avgVote = getTextFromElement(voteElement, "average");

        Element choicesElement = voteElement.getElement("choices");
        int childCount = choicesElement.getChildCount();

        Vector vEntries = new Vector();

        Element choiceElement = null;

        for (int i = 0; i < childCount; i++)
        {
            if ( choicesElement.getType(i) == Xml.ELEMENT)
            {
                choiceElement = choicesElement.getElement(i);

                String choiceValue = getTextFromElement(choiceElement,"value");
                String choiceName = getTextFromElement(choiceElement,"name");
                String choiceVotes = getTextFromElement(choiceElement,"number");

                Vote vote = new Vote(choiceValue, choiceName, choiceVotes);

                vEntries.addElement(vote);
            }
        }

        return new VoteSummary( numVotes, avgVote, vEntries);

    }

    private static String getTextFromElement(Element elementRoot, String elementName)
    {
        String returnText = elementRoot.getElement(elementName).getText();

        return returnText;
    }
}