dom4j

import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;


public class Test {
    /**
         * 建立一個XML文檔,文檔名由輸入屬性決定
         * @param filename 需建立的文件名
         * @return 返回操作結果, 0表失敗, 1表成功
         */
        public int createXMLFile(String filename){
             /** 返回操作結果, 0表失敗, 1表成功 */
             int returnValue = 0;
             /** 建立document對象 */
             Document document = DocumentHelper.createDocument();
             /** 建立XML文檔的根books */
             Element booksElement = document.addElement("books");
             /** 加入一行註釋 */
             booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");
             /** 加入第一個book節點 */
             Element bookElement = booksElement.addElement("book");
             /** 加入show屬性內容 */
             bookElement.addAttribute("show","yes");
             /** 加入title節點 */
             Element titleElement = bookElement.addElement("title");
             /** 爲title設置內容 */
             titleElement.setText("Dom4j Tutorials");
                
             /** 類似的完成後兩個book */
             bookElement = booksElement.addElement("book");
             bookElement.addAttribute("show","yes");
             titleElement = bookElement.addElement("title");
             titleElement.setText("Lucene Studing");
             bookElement = booksElement.addElement("book");
             bookElement.addAttribute("show","no");
             titleElement = bookElement.addElement("title");
             titleElement.setText("Lucene in Action");
                
             /** 加入owner節點 */
             Element ownerElement = booksElement.addElement("owner");
             ownerElement.setText("O'Reilly");
                
             try{
                     /** 將document中的內容寫入文件中 */
                     XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));
                     writer.write(document);
                     writer.close();
                     /** 執行成功,需返回1 */
                     returnValue = 1;
             }catch(Exception ex){
                     ex.printStackTrace();
             }
                            
             return returnValue;
        }
        /**
         * 修改XML文件中內容,並另存爲一個新文件
         * 重點掌握dom4j中如何添加節點,修改節點,刪除節點
         * @param filename 修改對象文件
         * @param newfilename 修改後另存爲該文件
         * @return 返回操作結果, 0表失敗, 1表成功
         */
        public int ModiXMLFile(String filename,String newfilename){
             int returnValue = 0;
             try{
                     SAXReader saxReader = new SAXReader();    
                     Document document = saxReader.read(new File(filename));
                     /** 修改內容之一: 如果book節點中show屬性的內容爲yes,則修改成no */
                     /** 先用xpath查找對象 */
                     List list = document.selectNodes("/books/book/@show" );    
                     Iterator iter = list.iterator();
                     while(iter.hasNext()){
                            Attribute attribute = (Attribute)iter.next();
                            if(attribute.getValue().equals("yes")){
                                    attribute.setValue("no");
                            }        
                     }
                        
                     /**
                        * 修改內容之二: 把owner項內容改爲Tshinghua
                        * 並在owner節點中加入date節點,date節點的內容爲2004-09-11,還爲date節點添加一個屬性type
                        */
                     list = document.selectNodes("/books/owner" );
                     iter = list.iterator();
                     if(iter.hasNext()){
                            Element ownerElement = (Element)iter.next();
                            ownerElement.setText("Tshinghua");
                            Element dateElement = ownerElement.addElement("date");
                            dateElement.setText("2004-09-11");
                            dateElement.addAttribute("type","Gregorian calendar");
                     }
                        
                     /** 修改內容之三: 若title內容爲Dom4j Tutorials,則刪除該節點 */
                     list = document.selectNodes("/books/book");
                     iter = list.iterator();
                     while(iter.hasNext()){
                            Element bookElement = (Element)iter.next();
                            Iterator iterator = bookElement.elementIterator("title");
                            while(iterator.hasNext()){
                                    Element titleElement=(Element)iterator.next();
                                    if(titleElement.getText().equals("Dom4j Tutorials")){
                                         bookElement.remove(titleElement);
                                    }
                            }
                     }                    
                        
                        
                     try{
                            /** 將document中的內容寫入文件中 */
                            XMLWriter writer = new XMLWriter(new FileWriter(new File(newfilename)));
                            writer.write(document);
                            writer.close();
                            /** 執行成功,需返回1 */
                            returnValue = 1;
                     }catch(Exception ex){
                            ex.printStackTrace();
                     }
                        
             }catch(Exception ex){
                     ex.printStackTrace();
             }
             return returnValue;
        }
        /**
         * 格式化XML文檔,並解決中文問題
         * @param filename
         * @return
         */
        public int formatXMLFile(String filename){
             int returnValue = 0;
             try{
                     SAXReader saxReader = new SAXReader();    
                     Document document = saxReader.read(new File(filename));
                     XMLWriter writer = null;
                     /** 格式化輸出,類型IE瀏覽一樣 */
                     OutputFormat format = OutputFormat.createPrettyPrint();
                     /** 指定XML編碼 */
                     format.setEncoding("UTF-8");
                     writer= new XMLWriter(new FileWriter(new File(filename)),format);
                     writer.write(document);
                     writer.close();            
                     /** 執行成功,需返回1 */
                     returnValue = 1;            
             }catch(Exception ex){
                     ex.printStackTrace();
             }
             return returnValue;
        }
        
  public static void main(String[] args) {
  Test t=new Test();
  t.createXMLFile("1.xml");
  t.ModiXMLFile("1.xml", "2.xml");
  t.formatXMLFile("2.xml");
  }

}