xml技术之xpath，通过Xpath快速获取xml中的节点内容

package com.chen.xpath;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;

public class TextXpath
{
 private String pathString = "";
 public TextXpath(String pathString){
  this.pathString = pathString;
  
 }
 
 public void selectSome() throws JDOMException, IOException
 {
  File file = new File(pathString);
  if (!file.exists())
  {
   System.out.println("文件不存在");
  }
  SAXBuilder sax = new SAXBuilder(false);
  Document doc = sax.build(file);
  Element rootElement = doc.getRootElement();
//  List list = rootElement.getChildren();
//  this.readXml(list);
  // 查询绝对路径/metadata/MODULE/MODULE/OPERATE下的节点集合(包括根路径)
  String xpathString = "/metadata/MODULE/MODULE/OPERATE";
  List elist = XPath.selectNodes(rootElement, xpathString);
  this.readXmlList(elist);
  System.out.println("************************************************************");

  // 查询所有节点名字为OPERATE的节点集合
  String xpathStringA = "//OPERATE";
  List elistA = XPath.selectNodes(rootElement, xpathStringA);
  this.readXmlList(elistA);
  System.out.println("************************A************************************");
  
  // 查询所有节点名字为OPERATE中KEY="hr_chenYearAction_list"的节点集合
  String xpathStringB = "//OPERATE[@KEY='hr_chenYearAction_list']";
  List elistB = XPath.selectNodes(rootElement, xpathStringB);
  this.readXmlList(elistB);
  System.out.println("*************************B***********************************");

  // 查询所有节点中KEY="hr_chenYearAction_list"的节点集合
  String xpathStringC = "//*[@KEY='hr_chenYearAction_list']";
  List elistC = XPath.selectNodes(rootElement, xpathStringC);
  this.readXmlList(elistC);
  System.out.println("*************************C***********************************");

  // 使用 selectSingleNode 查询所有节点中 得到第一个节点 Element
  String xpathStringD = "//MODULE/*";
  Element element = (Element) XPath.selectSingleNode(rootElement, xpathStringD);
  System.out.println(element.getAttributeValue("KEY").toString());
  System.out.println(element.getTextNormalize());
//  this.readXmlList(elistD);
  System.out.println("***********************D*************************************");
  

  /*
  XPATH中一些有用的函数：
  string concat (string, string, string*)  联接两个字符串 
  boolean starts-with (string, string)  判断某字符串是否以另一字符串开头 
  boolean contains (string, string)  判断某字符串是否包含另一字符串 
  string substring (string, number, number)  取子字符串 
  number string-length (string)  测字符串长度 
  number sum (node-set)  求和 
  number floor (number)  求小于此数的最大整数值 
  number ceiling (number)  求大于此数最小整数值 
   * 
   */
  // 查询所有节点中KEY以hr_chenYearAction开头的节点集合
  String xpathStringE = "//*[starts-with(@KEY,'hr_chenYearAction')]";
  List elistE = XPath.selectNodes(rootElement, xpathStringE);
  this.readXmlList(elistE);
  System.out.println("*************************E***********************************");
  
 }
 
 /**打印结果
  * 
  * @author chen_weixian
  * May 4, 2012   10:53:39 AM
  * @param list
  */
 public void readXmlList(List list)
 {
  for (int i = 0; i<list.size(); i++ )
  {
   Element el  = (Element) list.get(i);
   System.out.println(el.getAttributeValue("KEY"));
   System.out.println(el.getAttributeValue("TITLE"));    
  
  }
 }
 
 public void readXml(List list)
 {
  for (int i = 0; i<list.size(); i++ )
  {
   Element el  = (Element) list.get(i);
   List listi = el.getChildren();
   if (listi != null && listi.size() > 0)
   {
    readXml(listi);
   }
   else
   {
    System.out.println(el.getAttributeValue("KEY"));
    System.out.println(el.getAttributeValue("TITLE"));    
   }
   
  }
 }

 /**
  * @author chen_weixian
  * May 4, 2012   9:06:12 AM
  * @param args
  */
 public static void main(String[] args)
 {
  String pathString = "F:/workspaceA/jzProject/config/resource_shop.xml";
  TextXpath textXpath = new TextXpath(pathString);
  try
  {
   textXpath.selectSome();
  }
  catch (JDOMException e)
  {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  catch (IOException e)
  {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }

}