java dom4j xml生成,解析

1. 用Java代码生成xml文档

package com.test.dom;

import java.io.FileOutputStream;
import java.io.IOException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Dom4jDemo {

    public static void main(String[] args) throws IOException {
        Document doc = DocumentHelper.createDocument();
        Element root = DocumentHelper.createElement("books");

        doc.setRootElement(root);
        root.addAttribute("id", "001");
        Element bookElement = root.addElement("book");
        Element titleElement = bookElement.addElement("title");
        titleElement.setText("Harry Potter");

        Element authorElement = bookElement.addElement("author");
        authorElement.setText("J K. Rowling");

        // 输出到控制台中
        XMLWriter xmlWriter = new XMLWriter();
        xmlWriter.write(doc);

        // 把生成的xml文档存放在硬盘上 true代表是否换行
        OutputFormat format = new OutputFormat("    ", true);
        format.setEncoding("GBK");// 设置编码格式
        XMLWriter fileXmlWriter = new XMLWriter(new FileOutputStream("e:/books.xml"), format);

        fileXmlWriter.write(doc);
        fileXmlWriter.close();
    }
}

xml结构

<?xml version="1.0" encoding="GBK"?>
<books id="001">
    <book>
        <title>Harry Potter</title>
        <author>J K. Rowling</author>
    </book>
</books>

2. 解析xml

从String中获取

String xmlStr = "<books>......</books>";
Document document = DocumentHelper.parseText(xmlStr); 

从文件中获取

//创建SAXReader对象
 SAXReader reader = new SAXReader();
//读取文件 转换成Document
  Document document = reader.read(new File("books.xml"));