/*
* 假定目前XML数据样式为：
*<?xml version="1.0"?>
*<goodsList>
*    <goods item="1">
*        <name>华为手机</name>
*        <type>华为</type>
*    </goods>
*    <goods item="2">
*        <name>小米手机</name>
*        <type>小米</type>
*    </goods>
*</goodsList>
* 需要将xml解析成Goods的一个List
*/
public class XmlReaderController {public class Goods {public String item{get;set;}public String name{get;set;}public String type{get;set;}}public List<Goods> getGoodsListByXmlFile(String goodsXml) {XmlStreamReader reader = new XmlStreamReader(goodsXml);Boolean flagXmlEnd = true;List<Goods> goodsList = new List<Goods>();while(flagXmlEnd) {Goods tempGoods;if(reader.getEventType() == XmlTag.START_ELEMENT) {if(reader.getLocalName().equalsIgnoreCase('goods')) {tempGoods = getGoods(reader);}}if(reader.hasNext()) {reader.next();} else {flagXmlEnd = false;break;}if(tempGoods != null) {goodsList.add(tempGoods);}}return goodsList;}Goods getGoods(XmlStreamReader reader) {Goods tempGoods = new Goods();tempGoods.item = reader.getAttributeValue(null,'item');Boolean flagIsLoop = true;while(flagIsLoop) {if(reader.hasNext()) {reader.next();if(reader.getEventType() == XmlTag.START_ELEMENT) {if(reader.getLocalName().equalsIgnoreCase('name')) {reader.next();tempGoods.name = reader.getText();} else if(reader.getLocalName().equalsIgnoreCase('type')) {reader.next();tempGoods.type = reader.getText();}}if(reader.getEventType() == XmlTag.END_ELEMENT && reader.getLocalName().equalsIgnoreCase('goods')) {flagIsLoop = false;break;}} else {flagIsLoop = false;break;}}return tempGoods;}
}

String goodsXml = '<?xml version="1.0"?>' +'<goodsList>' +'<goods item="1">' +'<name>华为手机</name>' +'<type>华为</type>' +'</goods>' +'<goods item="2">' +'<name>小米手机</name>' +'<type>小米</type>' +'</goods>' +'</goodsList>';
List<XmlReaderController.Goods> goodsList = new XmlReaderController().getGoodsListByXmlFile(goodsXml);
System.debug(JSON.serialize(goodsList));

[
{
"type":"华为",
"name":"华为手机",
"item":"1"
},
{
"type":"小米",
"name":"小米手机",
"item":"2"
}

public class XmlWriterController {public static void writeXml() {XmlStreamWriter writer = new XmlStreamWriter();writer.writeStartDocument('utf-8','1.0');writer.writeComment('goodsList start here');writer.writeStartElement('','goodsList','http://www.goods.com');writer.writeNamespace('', 'http://www.goods.com'); writer.writeStartElement(null,'goods',null);writer.writeAttribute(null,null,'item','1');writer.writeStartElement(null,'name',null);writer.writeCharacters('华为手机');writer.writeEndElement();writer.writeStartElement(null,'type',null);writer.writeCharacters('华为');writer.writeEndElement();writer.writeEndElement();writer.writeStartElement(null,'goods',null);writer.writeAttribute(null,null,'item','2');writer.writeStartElement(null,'name',null);writer.writeCharacters('小米手机');writer.writeEndElement();writer.writeStartElement(null,'type',null);writer.writeCharacters('小米');writer.writeEndElement();writer.writeEndElement();writer.writeEndElement();writer.writeEndDocument();system.debug(writer.getXmlString());}
}

public class DomXmlController {public class Goods {String item{get;set;}String name{get;set;}String type{get;set;}}public List<Goods> getGoodsViaXmlDom(String xmlString) {Dom.Document document = new Dom.Document();document.load(xmlString);Dom.XmlNode rootElement = document.getRootElement();List<Goods> goodsList = new List<Goods>();for(Dom.XmlNode node : rootElement.getChildElements()) {if(node.getName().equalsIgnoreCase('goods')) {Goods tempGoods = new Goods();tempGoods = getGoodsNameAndType(node);tempGoods.item = node.getAttribute('item',null);goodsList.add(tempGoods);}}return goodsList;}Goods getGoodsNameAndType(Dom.XmlNode parentNode) {transient Goods tempGoods = new Goods();for(Dom.XmlNode node : parentNode.getChildElements()) {if(node.getName().equalsIgnoreCase('name')) {tempGoods.name = node.getText();} else if(node.getName().equalsIgnoreCase('type')) {tempGoods.type = node.getText();}}return tempGoods;}
}

String goodsXml = '<?xml version="1.0"?>' +'<goodsList>' +'<goods item="1">' +'<name>华为手机</name>' +'<type>华为</type>' +'</goods>' +'<goods item="2">' +'<name>小米手机</name>' +'<type>小米</type>' +'</goods>' +'</goodsList>';
System.debug(JSON.serialize(new DomXmlController().getGoodsViaXmlDom(goodsXml)));