用dom4j建立,修改XML文檔,并解決格式化輸出和中文問題[轉]
<books>
<!--This is a test for dom4j, holen, 2004.9.11-->
<book show="no">
<title>Dom4j Tutorials</title>
</book>
<book show="no">
<title>Lucene Studing</title>
</book>
<book show="no">
<title>Lucene in Action</title>
</book>
<owner>O'Reilly</owner>
</books>
--------------------------------
package com.holen.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;
/**
* @author Holen Chen
*/
public class Dom4jDemo {
public Dom4jDemo() {
}
/**
* 建立一個XML文檔,文檔名由輸入參數決定
* @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");
/** 加入一行注釋 */
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參數內容 */
bookElement.addAttribute("show","yes");
/** 加入title節點 */
Element titleElement = bookElement.addElement("title");
/** 為title設置內容 */
titleElement.setText("Dom4j Tutorials");
/** 類似的完成后兩個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,并另存為一個新文件
* 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 修改后另存為該文件
* @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參數的內容為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項內容改為Tshinghua
* 并在owner節點中加入date節點,date節點的內容為2004-09-11,還為date節點添加一個參數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內容為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,并解決中文問題
* @param filename
* @return
*/
public int formatXMLFile(String filename){
int returnValue = 0;
try{
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filename));
XMLWriter output = null;
/** 格式化輸出,類型IE瀏覽一樣 */
OutputFormat format = OutputFormat.createPrettyPrint();
/** 指定XML字符集編碼 */
format.setEncoding("GBK");
output = new XMLWriter(new FileWriter(new File(filename)),format);
output.write(document);
output.close();
/** 執行成功,需返回1 */
returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
return returnValue;
}
public static void main(String[] args) {
Dom4jDemo temp = new Dom4jDemo();
System.out.println(temp.createXMLFile("d://holen.xml"));
System.out.println(temp.ModiXMLFile("d://holen.xml","d://holen2.xml"));
System.out.println(temp.formatXMLFile("d://holen2.xml"));
}
}
轉自：http://www.donews.net/holen/archive/2004/09/11/96062.aspx
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摘要: 在使用EMaker時發現竟然沒有Tree組件可以使用，可又需要靠它來完成一定的功能。在參考了Emaker的文檔后，終于寫了出來，發在這里與大家共享。
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