java解析xml获取对应值

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
     * 解析xml 银行卡
     * parseXMlToBankCard 
     * @author sunjianbo
     * @time 2016年10月27日下午2:21:42
     * @param protocolXML
     * @param cardType
     * @return
     */
    public  ResultMsg parseXMlToBankCard(String protocolXML,ResultMsg rsm) {   
        
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory   
                    .newInstance();   
            DocumentBuilder builder = factory.newDocumentBuilder();   
            Document doc;
            doc = builder   
                    .parse(new InputSource(new StringReader(protocolXML)));
             Element root = doc.getDocumentElement();   
                NodeList nodes = root.getChildNodes();
                BankCard bankCard = new BankCard();
                if (nodes != null) { 
                     //<ResCode>第一个子节点 ，是否是Success
                     Node firstNode = nodes.item(0);
                     String firstNodeValue = firstNode.getFirstChild().getNodeValue();
                     if(null !=firstNodeValue &&  "Success".equals(firstNodeValue)){
                         for(int j = 0; j < nodes.getLength(); j++){
                              Node node = nodes.item(j);
                              if(null != node.getNodeName() && "Result".equals(node.getNodeName())){
                               //解析银行卡
                                
                                    NodeList nls =  node.getChildNodes();
                                   for(int i= 0; i < nls.getLength(); i++){
                                         Node nl = nls.item(i);
                                         if(nl.getNodeName()!= null && nl.getFirstChild() != null){
                                                // System.out.println("节点**" + nl.getNodeName() + "\ttext="  
                                               //    + nl.getFirstChild().getNodeValue());
                                                 if(nl.getFirstChild().getNodeValue() != null){
                                                     if("BankName".equals(nl.getNodeName()) ){
                                                         bankCard.setBankName(nl.getFirstChild().getNodeValue());
                                                     }
                                                     /*if("BankId".equals(nl.getNodeName()) ){
                                                         bankCard.setCardNo(nl.getFirstChild().getNodeValue());
                                                     }*/
                                                     if("CardName".equals(nl.getNodeName()) ){
                                                         bankCard.setCardName(nl.getFirstChild().getNodeValue());
                                                     }
                                                     if("CardType".equals(nl.getNodeName()) ){
                                                         bankCard.setCardType(nl.getFirstChild().getNodeValue());
                                                     }
                                                     if("CardNumber".equals(nl.getNodeName()) ){
                                                         bankCard.setCardNo(nl.getFirstChild().getNodeValue());
                                                     }
                                                     rsm.setRtncode(0);
                                                     rsm.setRtninfo(bankCard);
                                                 }
                                         }
                                    }
                             }
                         }
                      }else{
                          Node secendtNode = nodes.item(1);
                             String secendtNodeValue = secendtNode.getFirstChild().getNodeValue();
                          rsm.setErrmsg(secendtNodeValue);
                      }
                     
                }else{
                    rsm.setErrmsg("Test failed, did not get test results, please test again");
                }
                
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   
       
        return rsm;
    }