java使用DOM4J对XML文件进行增删改查操作

本文实例为大家分享了java使用DOM4J对XML文件进行增删改查操作的具体代码，供大家参考，具体内容如下

源代码：

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 {
    
    document document = getdocument();

    

    
    List books = readAllElementsFromXMLdocument(document);
    traverseBooks(books);

    
    ModifyInformationOfXMLdocument(document);

     
     deleteInformationOfXMLdocument(document);

     
     addNewBookToXMLdocument(document);

     
     writeTonewXMLdocument(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");
  }

  
  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);
      }
    }
  }

  
  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();
    }
  }

  
  private static void traverseBooks(List books) {
    for (Iterator iterator = books.iterator(); iterator.hasNext();) {
      Book book = iterator.next();
      System.out.println(book);
    }
  }

  
  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;
  }

  
  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();
  }

  
  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

  
    
    80.00
  
  
    
    100.00
  

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。