【Java Xml】dom4j写入XML

概述

官网

读取查看另一篇：链接

前期准备

maven

<!-- https://mvnrepository.com/artifact/dom4j/dom4j -->
<dependency><groupId>dom4j</groupId><artifactId>dom4j</artifactId><version>1.6.1</version>
</dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.36</version>
</dependency>

使用

基础类

@Data
@AllArgsConstructor
public class Book {private String title;private String author;private int price;// getter和setter方法省略
}

写入

main

// 创建一个Book对象
Book book = new Book("Java Programming", "John Doe", 29);// 将 Book 对象转为 XML
Document document = createXml(book);// 保存 XML 到文件
saveXmlToFile(document, "demo/book2222.xml");

方法

// 将 Book 对象转为 XML
private static Document createXml(Book book) {// 创建根元素 <Book>Element rootElement = org.dom4j.DocumentHelper.createElement("Book");// 为根元素添加子元素 <Title>, <Author>, <Price>rootElement.addElement("Title").setText(book.getTitle());rootElement.addElement("Author").setText(book.getAuthor());rootElement.addElement("Price").setText(String.valueOf(book.getPrice()));// 创建 Document 对象Document document = org.dom4j.DocumentHelper.createDocument(rootElement);return document;
}// 保存 XML 到文件
private static void saveXmlToFile(Document document, String filePath) throws IOException {// 创建输出格式OutputFormat format = OutputFormat.createPrettyPrint();format.setEncoding("UTF-8");// 不写 XML 声明format.setSuppressDeclaration(true);// 声明后不换行format.setNewLineAfterDeclaration(false);// 去除空白字符format.setTrimText(true);// 设置缩进format.setIndent(true);format.setIndentSize(2);// 创建 XMLWriterXMLWriter writer = new XMLWriter(new FileWriter(filePath), format);// 写入 XML 文件writer.write(document);writer.close();
}

改造成接口

基础接口

XmlWriteBaseHandler

import org.dom4j.Document;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;import java.io.FileWriter;
import java.io.IOException;public interface XmlWriteBaseHandler<T> {/*** 对象bo转为xml*         // 创建根元素 <Book>*         Element rootElement = org.dom4j.DocumentHelper.createElement("Book");**         // 为根元素添加子元素 <Title>, <Author>, <Price>*         rootElement.addElement("Title").setText(book.getTitle());*         rootElement.addElement("Author").setText(book.getAuthor());*         rootElement.addElement("Price").setText(String.valueOf(book.getPrice()));**         // 创建 Document 对象*         Document document = org.dom4j.DocumentHelper.createDocument(rootElement);**         return document;* @param bo* @author */public Document createXmlDoc(T bo);/*** 写入xml** @param document 文档* @param filePath 文件名* @return {@link Document }* @author */public default void writeXml(Document document, String filePath) throws IOException {// 创建输出格式OutputFormat format = OutputFormat.createPrettyPrint();format.setEncoding("UTF-8");// 不写 XML 声明format.setSuppressDeclaration(true);// 声明后不换行format.setNewLineAfterDeclaration(false);// 去除空白字符format.setTrimText(true);// 设置缩进format.setIndent(true);format.setIndentSize(2);// 创建 XMLWriterXMLWriter writer = new XMLWriter(new FileWriter(filePath), format);// 写入 XML 文件writer.write(document);writer.close();}
}

使用方式

实现基础接口

import BO.Book;
import base.XmlWriteBaseHandler;
import org.dom4j.Document;
import org.dom4j.Element;/*** xml写入实现**/
public class XmlWriteTestHandler implements XmlWriteBaseHandler<Book> {@Overridepublic Document createXmlDoc(Book book) {// 创建根元素 <Book>Element rootElement = org.dom4j.DocumentHelper.createElement("Book");// 为根元素添加子元素 <Title>, <Author>, <Price>rootElement.addElement("Title").setText(book.getTitle());rootElement.addElement("Author").setText(book.getAuthor());rootElement.addElement("Price").setText(String.valueOf(book.getPrice()));// 创建 Document 对象Document document = org.dom4j.DocumentHelper.createDocument(rootElement);return document;}
}

实际调用

// 数据准备
Book book = new Book("Java Programming", "John Doe", 29);// 实现接口
XmlWriteBaseHandler<Book> bookHandler = new XmlWriteTestHandler();// 写入xml
Document xmlDoc = bookHandler.createXmlDoc(book);
bookHandler.writeXml(xmlDoc, "demo/book1.xml");