StAXReader.java

package com.dgstack.dev;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

import com.dgstack.dev.vo.UserVO;

/**
 * @author digvijayb
 */
public class StAXReader {

    public List<UserVO> getUserList(String path) throws FileNotFoundException, XMLStreamException{
        StartElement startElement = null;
        EndElement endElement = null;
        Attribute attribute = null;
        QName idAttr =new QName("id"); 
        XMLEvent event = null;
        List<UserVO> list = null;
        UserVO userVO = null;
        String currentValue = "";
        XMLInputFactory inputFactory = XMLInputFactory.newInstance();
        XMLEventReader reader  = inputFactory.createXMLEventReader(new  FileReader(path));

        while(reader.hasNext()){
            event = reader.nextEvent();
            if(event.isStartElement()){
                startElement = event.asStartElement();
                if("users".equals(startElement.getName().getLocalPart())){
                    list = new ArrayList<UserVO>();
                }else if("user".equals(startElement.getName().getLocalPart())){ 
                    userVO = new UserVO();
                    attribute = startElement.getAttributeByName(idAttr);
                    userVO.setId(Integer.parseInt(attribute.getValue()));
                }
            }else if(event.isEndElement()){
                endElement = event.asEndElement();
                if("users".equals(endElement.getName().getLocalPart())){
                    break;
                }else if("user".equals(endElement.getName().getLocalPart())){ 
                    list.add(userVO);
                    userVO = null;
                }else if("name".equals(endElement.getName().getLocalPart())){
                    userVO.setName(currentValue.trim());
                }else if("username".equals(endElement.getName().getLocalPart())){
                    userVO.setUserid(currentValue.trim());
                }else if("password".equals(endElement.getName().getLocalPart())){
                    userVO.setPassword(currentValue.trim());
                }else if("gender".equals(endElement.getName().getLocalPart())){
                    userVO.setGender(currentValue.trim());
                }else if("age".equals(endElement.getName().getLocalPart())){
                    if(!currentValue.trim().isEmpty())
                    userVO.setAge(Integer.parseInt(currentValue.trim()));
                }else if("location".equals(endElement.getName().getLocalPart())){
                    userVO.setLocation(currentValue.trim());
                }
            }else if (event.isCharacters() && userVO != null && startElement != null) {
                currentValue = event.asCharacters().getData();
            }
        }
        return list;
    }

}