dom4j解析xml文件

package com.xml.dom4j;import java.io.File;import java.util.List;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader; public class XMLReader {             public void read(String fileName) throws DocumentException{              File xmlFile = new File(fileName);              read(xmlFile);       }             @SuppressWarnings("unchecked")       public void read(File xmlFile) throws DocumentException{              //使用SAX方式解析xml              SAXReader saxReader = new SAXReader();              //把xml文件转换成文档对象               Document document = saxReader.read(xmlFile);               //取得根节点               Element rootNode = document.getRootElement();              //取得根节点的名字               System.out.println("根节点名称: "+rootNode.getName());              //取得所有的二级(下一级)子节点               List secondList =  rootNode.elements();               readsecondLevelElement(secondList);                      }             @SuppressWarnings("unchecked")       public void readsecondLevelElement( List secondList){              for(Element secondElement : secondList){                      System.out.println(" \t二级节点名称:"+secondElement.getName());                      //取得所有的二级子节点的属性                      System.out.println(" \t    属性title:"+secondElement.attributeva lue("title")+" 属性publisher:"+secondElement.attributeva lue("publisher"));                     //取得所有的三级(下一级)子节点                      List thirdList =  secondElement.elements();                      readThirdLevelElement(thirdList);               }       }             @SuppressWarnings("unchecked")       public void readThirdLevelElement( List thirdList){              for(Element thirdElement : thirdList){                      System.out.println(" \t\t三级节点名称:"+thirdElement.getName());                     //取得所有的三级子节点的属性                      System.out.println(" \t\t     属性level:"+thirdElement.attributeva lue("level")+" 属性date:"+thirdElement.attributeva lue("date"));                     //取得所有的四级(下一级)子节点                      List fourList =  thirdElement.elements();                      readFourLevelElement(fourList);               }       }             //读取四级元素的方法       public void readFourLevelElement( List fourList){               for(Element fourElement : fourList){                      System.out.println(" \t\t\t四级节点名称:"+fourElement.getName());                     if(fourElement.getName().equals("title")){                            System.out.println(" \t\t\t     四级节点内容:"+fourElement.getText());                     }else if(fourElement.getName().equals("author")){                            //fourElement.element("firstname") 通过名字取得firstname节点                            System.out.println(" \t\t\t\t五级级节点内容:"+fourElement.element("firstname").getName());                            System.out.println(" \t\t\t\t        五级节点内容:"+fourElement.element("firstname").getText());                            System.out.println(" \t\t\t\t五级级节点内容:"+fourElement.element("lastname").getName());                            System.out.println(" \t\t\t\t        五级节点内容:"+fourElement.element("lastname").getText());                     }               }       }}  

编写测试类

 public void testRead() {              try {                     String file = "F:/students/dom4j_XML/src/catalog.xml";                     XMLReader reader = new XMLReader();                     reader.read(file);              } catch (DocumentException e) {              }       }

要点说明:  使用dom4j方式解析xml:        1.指定要解析的文件       File xmlFile = new File(fileName);     2.选择xml解析方式       //使用SAX方式解析xml              SAXReader saxReader = new SAXReader();        3.解析xml文件         //把xml文件转换成文档对象               Document document = saxReader.read(xmlFile);     4.解析文档对象dom对象               //取得根节点               Element rootNode = document.getRootElement();               //取得所有的下一级节点               List secondList =  rootNode.elements();               //根据名字取的子节点               fourElement.element("firstname")               //根据名字取的子节点,和节点内容               fourElement.element("firstname").getText()               //根据名字取的节点属性值               thirdElement.attributeva lue("level")

document.selectSingleNode( "/web-app/session-config/session-timeout "); //从根结点向下得到一个node