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这篇文章给大家介绍怎么在java中使用DOM4J对XML文件进行操作，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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DOM4j.java
package com.zc.homeWork19;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import com.zc.homeWork19.Book;
public class DOM4j {
public static void main(String args[]) throws Exception {
/**
* 第一步，得到document对象。
*/
Document document = getDocument();
/**
* 第二步，修改得到的document对象
*/
/**
* 首先，读取功能
*/
List books = readAllElementsFromXMLDocument(document);
traverseBooks(books);
/**
* 其次，修改功能 修改内容：将id为b002的元素的title改为Java Core，Price改为100.01
*/
ModifyInformationOfXMLDocument(document);
/**
* 再者：实现删除功能 删除内容：删除掉id为book1的元素内容。
*/
deleteInformationOfXMLDocument(document);
/**
* 最后：实现添加i新元素功能 添加内容：id为book3，title内容为：凤姐玉照，price内容为10000.00
*/
addNewBookToXMLDocument(document);
/**
* 第三步：将得到的document对象持久化保存到硬盘（XML）
*/
writeToNewXMLDocument(document);
}
/**
* 实现了添加新节点：book的功能
*
* @param document
*/
private static void addNewBookToXMLDocument(Document document) {
Element root = document.getRootElement();
Element newBook = root.addElement("book");
newBook.addAttribute("id", "book3");
Element title = newBook.addElement("title");
title.setText("凤姐玉照");
Element price = newBook.addElement("price");
price.setText("10000.01");
}
/**
* 该方法实现了使用dom4j的删除元素的功能
*
* @param document
*/
private static void deleteInformationOfXMLDocument(Document document) {
Element root = document.getRootElement();
for (Iterator it = root.elementIterator(); it.hasNext();) {
Element book = (Element) it.next();
String id = book.attributeValue("id");
if ("book1".equals(id)) {
Element parent = book.getParent();
parent.remove(book);
}
}
}
/**
* 该方法的作用是修改document中的内容 将id为b002的元素的title改为Java Core，Price改为100.01
*
* @param document
*/
private static void ModifyInformationOfXMLDocument(Document document) {
Element root = document.getRootElement();
List books = root.elements();
for (int i = 0; i < books.size(); i++) {
Element book = (Element) books.get(i);
if ("book2".equals(book.attributeValue("id"))) {
for (Iterator it = book.elementIterator(); it.hasNext();) {
Element node = (Element) it.next();
String type = node.getName();
if ("title".equals(type)) {
node.setText("JAVA Core");
}
if ("price".equals(type)) {
node.setText("100.01");
}
}
}
}
try {
writeToNewXMLDocument(document);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 遍历集合
*
* @param books
*/
private static void traverseBooks(List books) {
for (Iterator iterator = books.iterator(); iterator.hasNext();) {
Book book = iterator.next();
System.out.println(book);
}
}
/**
* 该方法实现了对xml文档的读取功能
*
* @param document
* @return
*/
private static List readAllElementsFromXMLDocument(Document document) {
List books = new ArrayList();
Element root = document.getRootElement();
List list = root.elements();
for (int i = 0; i < list.size(); i++) {
Element book = (Element) list.get(i);
Book b = new Book();
String id = book.attributeValue("id");
List ll = book.elements();
b.setId(id);
System.out.println(id);
for (int j = 0; j < ll.size(); j++) {
Element element = (Element) ll.get(j);
if ("title".equals(element.getName())) {
String title = element.getText();
b.setTitle(title);
System.out.println(title);
}
if ("price".equals(element.getName())) {
String price = element.getText();
double p = Double.parseDouble(price);
b.setPrice(p);
System.out.println(price);
}
}
books.add(b);
}
return books;
}
/**
* 通过document对象将内存中的dom树保存到新的xml文档。
*
* @param document
* @throws Exception
*/
private static void writeToNewXMLDocument(Document document)
throws Exception {
XMLWriter writer = new XMLWriter(new FileWriter(
"src/com/zc/homeWork19/newbooks.xml"));
writer.write(document);
writer.close();
}
/**
* 该方法用于得到document对象。
*
* @return
* @throws Exception
*/
private static Document getDocument() throws Exception {
SAXReader sr = new SAXReader();
Document document = sr.read("src\\books.xml");
return document;
}
} Book.java
package com.zc.homeWork19;
public class Book {
public String title;
public double price;
public String id;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String toString() {
return "图书ISBN为：" + id + " 书名为：" + title + " 价格为：" + price;
}
}book.xml