JDOM解析处理xml

转自http://qingbyqing.iteye.com/blog/978113

1.解析xml

 package  com.qingbyqing.xmlParse;
 import  java.io.IOException;
 import  java.util.List;

 import  org.jdom.Attribute;
 import  org.jdom.Document;
 import  org.jdom.Element;
 import  org.jdom.JDOMException;
 import  org.jdom.input.SAXBuilder;

 /**
  * 解析xml
  * @author qingbyqing
  * @date 2011-3-29
  */
 public   class  XmlPasreUtil {

     Element root=null ;
     Document doc=null ;

     /**
      * 获得根元素
      * @param fileName 用于指定的xml文件名
      * @return
      */
     public   Element getRoot(String fileName){
         //1.创建解析对象
         //2.解析对象调用build方法建立文档对象
         //3.文档对象获得根元素
         SAXBuilder builder = new  SAXBuilder( false );
         try  {
              doc = builder.build(fileName);
         } catch  (JDOMException e) {

             e.printStackTrace();
         } catch  (IOException e) {

             e.printStackTrace();
         }
            Element root = doc.getRootElement();
         return  root;
     }
     /**
      * 获取xml的所有信息
      * @param root 传入一个根元素对象
      */
     public   void  getElementInfo(Element root){

         //遍历跟元素
         List<?> flist = root.getChildren("floor" );
        for ( int  i= 0 ;i<flist.size();i++){

            Element floor =(Element) flist.get(i);

            String level = floor.getAttributeValue("level" );
           p("第" +level+ "层" );

           List<?> rlist = floor.getChildren("room" );

           for ( int  j= 0 ;j<rlist.size();j++){


           Element room = (Element)rlist.get(j);

             String id=room.getAttributeValue("id" );

             String rep=room.getChild("represent" ).getText();
             String tel=room.getChild("telephone" ).getText();
             p("寝室编号：" +id+ "  负责人：" +rep+ "    寝室号码：" +tel);

           }
        }


     }


     /**
      * @param args
      */
     public   static   void  main(String[] args) {

             XmlPasreUtil pasre = new  XmlPasreUtil();

             Element root=pasre.getRoot("I:\\xml\\flats.xml" );
             pasre.getElementInfo(root);
     }

     public   void  p(String str){
         System.out.println(str);
     }

 }

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2.创建xml

 package  com.qingbyqing.xmlParse;

 import  java.io.FileWriter;
 import  java.io.IOException;

 import  org.jdom.Attribute;
 import  org.jdom.Comment;
 import  org.jdom.Document;
 import  org.jdom.Element;
 import  org.jdom.output.Format;
 import  org.jdom.output.XMLOutputter;

 /**
  * 创建一个xml
  * @author qingbyqing
  * @date 2011-3-29
  */
 public   class  XmlCreateUtil {

     Element root=null ; //跟元素
     Document doc=null ; //文档对象


     /**
      * 创建xml
      * @param ajax
      */

     public   void  createRootElement(String[] ajaxs){

         //1.根据数组创建跟元素
         //2.建立解释内容
         //3.建立子元素


          root = new  Element( "ajax" );

          //建立解释内容
          Comment comment = new  Comment( "简单的xml示例" );
          root.addContent(comment);

          //建立子元素
          for ( int  i= 0 ;i<ajaxs.length;i++){
              Element ajax = new  Element( "ajax" ); //子元素标签
              ajax.addContent(ajaxs[i]);//子元素内容
              Attribute id = new  Attribute( "id" , new  Integer(i).toString()); //子元素属性

              ajax.setAttribute(id);
              root.addContent(ajax);

          }
     }

     public   void  outputXml(String fileName){

          //1.根据跟元素创建文档
         //2.创建输出对象
         //3.创建输出格式对象
         //4.格式化文档
         //5.创建文件输出对象
         //6.输出对象
         doc =new  Document(root);
         XMLOutputter out = new  XMLOutputter();
         Format format = Format.getPrettyFormat();
         //设置输出格式
         format.setIndent(" " );

         format.setEncoding("gbk" );

         out.setFormat(format);

         try  {
             FileWriter fwt = new  FileWriter(fileName);
             out.output(doc, fwt);
             fwt.flush();
             fwt.close();
         } catch  (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     public   static   void  main(String args[]){

         String[] ajaxs={"JAVASCRIPT" , "HTML" , "CSS" , "DOM" , "XMLHTTPREQUEST" };

           XmlCreateUtil cu = new  XmlCreateUtil();
           cu.createRootElement(ajaxs);
           cu.outputXml("I:\\xml\\ajaxs.xml" );

     }
 }

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3.修改xml

 package  com.qingbyqing.xmlParse;

 import  java.io.FileWriter;
 import  java.io.IOException;

 import  org.jdom.Document;
 import  org.jdom.Element;
 import  org.jdom.JDOMException;
 import  org.jdom.input.SAXBuilder;
 import  org.jdom.output.Format;
 import  org.jdom.output.XMLOutputter;

 /**
  * 对xml进行修改删除
  * @author qingbyqing
  * @date 2011-3-29
  */

 public   class  XmlMendUtil {
     private  Document doc= null ;

     //根据需要修改的文件创建文档
     public   void  setRootNode(String fileName){

         SAXBuilder builder = new  SAXBuilder();
         try  {
             doc=builder.build(fileName);

         } catch  (JDOMException e) {
             e.printStackTrace();
         } catch  (IOException e) {
             e.printStackTrace();
         }

     }
     public   void  mendXml(){

         if (doc!= null ){
             Element root = doc.getRootElement();
             root.removeContent(root.getChildren().size()-1 ); //删除最后一个元素

             //删除第一个元素下的id属性
             root.getChild("ajax" ).setAttribute( "id" ,  "3" );
             root.getChild("ajax" ).removeContent();
             //修改第二个元素的内容为：DHTML
             root.getChild("ajax" ).addContent( "DTML" );
         }

         return ;
     }
     public   void  outputXML(String fileName){

            XMLOutputter out=new  XMLOutputter();
            Format format = Format.getPrettyFormat();
            format.setEncoding("UTF-8" );
            format.setIndent(" " );

            out.setFormat(format);

            try  {
             FileWriter fwt = new  FileWriter(fileName);
             out.output(doc, fwt);
             fwt.flush();
             fwt.close();
         } catch  (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

     }

     /**
      * @param args
      */
     public   static   void  main(String[] args) {

         XmlMendUtil mend=new  XmlMendUtil();
         mend.setRootNode("I:\\xml\\ajaxs.xml" );

         mend.mendXml();
         mend.outputXML("I:\\xml\\mended.xml" );
     }
 }

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生成如下文件

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将jdom-jar导入到项目中去：
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