中财网哈市那里批发豆包:dom4j操作XML大全
来源：百度文库 编辑：中财网 时间：2024/05/05 12:01:44
//首先要下载dom4j.jar
//示例1
package dom4jdemo;
import java.io.File;
import java.io.FileInputStream;
import java.io.StringBufferInputStream;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
public class Dom4jParseDemo {
public static void main(String[] args) {
String xml="";
xml+="";
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SAXReader saxReader = new SAXReader();
try {
//File file=new File("C:\\test.xml");
//FileInputStream in=new FileInputStream(file);
//Document document = saxReader.read(in);//从文件流读入xml数据
StringBufferInputStream strInStream=new StringBufferInputStream(xml);
Document document = saxReader.read(strInStream);//从STRING对象读入XML数据
Element root = document.getRootElement();
List listUsers=root.selectNodes("users");
for(int i=0;i
Node nodeUsername=eleUser.selectSingleNode("username");
Node nodePassword=eleUser.selectSingleNode("password");
System.err.println("username:"+nodeUsername.getText());
System.err.println("password:"+nodeUsername.getText());
//System.err.println("username:"+nodeUsername.getStringValue());
//System.err.println("password:"+nodePassword.getStringValue());
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
//示例2
package dom4jdemo;
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 Dom4jUpdateDemo {
public int createXMLFile(String filename){
/** 返回操作结果, 0表失败, 1表成功 */
int returnValue = 0;
/** 建立document对象 */
Document document = DocumentHelper.createDocument();
/** 建立XML文档的根books */
Element booksElement = document.addElement("books");
/** 加入一行注释 */
booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");
/** 加入第一个book节点 */
Element bookElement = booksElement.addElement("book");
/** 加入show属性内容 */
bookElement.addAttribute("show","yes");
/** 加入title节点 */
Element titleElement = bookElement.addElement("title");
/** 为title设置内容 */
titleElement.setText("Dom4j Tutorials");
/** 类似的完成后两个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节点 */
Element ownerElement = booksElement.addElement("owner");
ownerElement.setText("O'Reilly");
try{
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
return returnValue;
}
/**
* 修改XML文件中内容,并另存为一个新文件
* 重点掌握dom4j中如何添加节点,修改节点,删除节点
* @param filename 修改对象文件
* @param newfilename 修改后另存为该文件
* @return 返回操作结果, 0表失败, 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));
/** 修改内容之一: 如果book节点中show属性的内容为yes,则修改成no */
/** 先用xpath查找对象 */
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");
}
}
/**
* 修改内容之二: 把owner项内容改为Tshinghua
* 并在owner节点中加入date节点,date节点的内容为2004-09-11,还为date节点添加一个属性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");
}
/** 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 */
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{
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new File(newfilename)));
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
}catch(Exception ex){
ex.printStackTrace();
}
return returnValue;
}
/**
* 格式化XML文档,并解决中文问题
* @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;
/** 格式化输出,类型IE浏览一样 */
OutputFormat format = OutputFormat.createPrettyPrint();
/** 指定XML编码 */
format.setEncoding("GBK");
writer= new XMLWriter(new FileWriter(new File(filename)),format);
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
return returnValue;
}
public static void main(String[] args) {
Dom4jUpdateDemo temp = new Dom4jUpdateDemo();
System.out.println(temp.createXMLFile("c://holen.xml"));
System.out.println(temp.ModiXMLFile("c://holen.xml","c://holen2.xml"));
System.out.println(temp.formatXMLFile("c://holen2.xml"));
}
}
//示例3
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.DocumentHelper;
import org.dom4j.io.XMLWriter;
public class Dom4JWriteDemo2 {
public static void main(String[] args) {
String usernames[]={"admin","zhong","yang"};
String passwords[]={"1984","123","321"};
Document doc = DocumentHelper.createDocument();
Element root = doc.addElement("root");
for (int i = 0; i < usernames.length; i++) {
Element users = root.addElement("users");
users.addAttribute("userId", String.valueOf(i));
Element username = users.addElement("username");
username.setText(usernames[i]);
Element password = users.addElement("password");
password.setText(passwords[i]);
}
try {
XMLWriter output = new XMLWriter(new FileWriter(new File("c:/Dom4j.xml")));
output.write(doc);
output.close();
System.out.println("XML创建成功!");
} catch (IOException e) {
System.out.println("XML创建失败!" + e.getMessage());
}
}
}