解析XML（WebService）

写一个方法用，WebService测试
对XML解析 传参数XmlDocument  xml
以前没有接触过具体的XML解析
想对这些了解下

javacode: 
public class WebServiceDemo { 
  public WebServiceDemo() { 
  } 
  public XmlDocument notifyGather(XmlDocument xml) 
  { 
    return null; 
  } 
} 

我给你提供一个解析xml的实例,看你可不可以把他套到你的方法里了,实际上解析xml核心只有7步:
1.得到DOM解析器的工厂实例
2.从DOM工厂获得DOM解析器
3.把要解析的XML文档转化为输入流，以便DOM解析器解析它(也可以用File来处理)
4.解析XML文档的输入流，得到一个Document
5.得到XML文档的根节点
6.得到节点的子节点(5,6两步也可以像我例子中那样直接得到需要遍历的子节点,根据实际情况灵活应变)
7.循环遍历子节点,获得其属性值
到此解析完毕,xml文档解析博大精深,呵呵,应对方法也有很多,我提供的是最基础的dom解析,希望有用!

package test1;

import java.io.*;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import com.sun.org.apache.xpath.internal.XPathAPI;

public class csdntest2 {
     public csdntest2(){  
         DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();
         @SuppressWarnings("unused")
        String Person_id = "";
         @SuppressWarnings({ "unused", "unused" })
        String Team_id = "";
         @SuppressWarnings("unused")
        String Player_status = "";
         @SuppressWarnings("unused")
        String First_name = "";
         @SuppressWarnings("unused")
        String Last_name = "";
         @SuppressWarnings("unused")
        String Jersey_number = "";
         @SuppressWarnings("unused")
        String Birth_date = "";
         @SuppressWarnings("unused")
        String Height = "";
         @SuppressWarnings("unused")
        String Weight = "";
         @SuppressWarnings("unused")
        String Position = "";
         @SuppressWarnings("unused")
        String School = "";
         @SuppressWarnings("unused")
        String DraftYear = "";
         @SuppressWarnings("unused")
        String PlayerCode = "";
         
         PrintWriter pw = null;
         try {
             File file = new File("d:/nba_rosters.txt");
             if(!file.exists())
                 file.createNewFile();
             pw = new PrintWriter(new FileOutputStream("d:/nba_rosters.txt",true));

             DocumentBuilder dombuilder=domfac.newDocumentBuilder();
             InputStream is=new FileInputStream("d:/nba_rosters.xml");
             Document doc = dombuilder.parse(is);
             NodeList Player_info = XPathAPI.selectNodeList(doc.getDocumentElement(), "/Msg_file/Game/Msg_Roster/Player_info");
             if(Player_info!=null){
                 System.out.println("("+Player_info.getLength()+")");
             for(int i = 0;i < Player_info.getLength();i ++){
                 Node Player = Player_info.item(i);
                 Person_id = Player.getAttributes().getNamedItem("Person_id").getNodeValue();
                 Team_id = Player.getAttributes().getNamedItem("Team_id").getNodeValue();
                 Player_status = Player.getAttributes().getNamedItem("Player_status").getNodeValue();
                 First_name = Player.getAttributes().getNamedItem("First_name").getNodeValue();
                 Last_name = Player.getAttributes().getNamedItem("Last_name").getNodeValue();
                 Jersey_number = Player.getAttributes().getNamedItem("Jersey_number").getNodeValue();
                 Birth_date = Player.getAttributes().getNamedItem("Birth_date").getNodeValue();
                 Height = Player.getAttributes().getNamedItem("Height").getNodeValue();
                 Weight = Player.getAttributes().getNamedItem("Weight").getNodeValue();
                 Position = Player.getAttributes().getNamedItem("Position").getNodeValue();
                 School = Player.getAttributes().getNamedItem("School").getNodeValue();
                 DraftYear = Player.getAttributes().getNamedItem("DraftYear").getNodeValue();
                 PlayerCode = Player.getAttributes().getNamedItem("PlayerCode").getNodeValue();
                 
                 pw.println(Person_id);
       }
              pw.close();
    }
           } catch (ParserConfigurationException e) {
                  e.printStackTrace();
           } catch (FileNotFoundException e) {
                  e.printStackTrace();
           } catch (SAXException e) {
                  e.printStackTrace();
           } catch (IOException e) {
                  e.printStackTrace();
           } catch (TransformerException e) {
                     e.printStackTrace();
           }
           
           finally{
              if(pw != null)
              pw.close();
           }
           
    }
    public static void main(String[] args) {
           new csdntest2();
    }
}

  以上提供了解析的xml原文件,和负责解析的java源码.xml文档有些冗余,我删掉了一部分,没办法,希望能对你有帮助!