dom4j读XML

最新推荐文章于 2023-05-15 02:00:40 发布

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本文介绍使用Java库DOM4J解析XML文件的四种方法。包括根据属性查找节点、按节点名称查找、遍历整个XML获取指定节点记录及遍历所有属性。

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package test;

import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

public class ReadXMLByDom {
    public static void main(String [] args){
        ReadXMLByDom r = new ReadXMLByDom();
        r.readXMLAllAttr();
        r.readXMLAllElement();
        r.readXMLAttr();
        r.readXMLElement();
    }

    //第一种：根据属性来查找
    //结果为：<book id="2"><Name>Linux</Name><price>100</price></book>
    public void readXMLAttr() {
        String str = "<books><book id='1'><Name>Java</Name><price>100</price></book>";
        str = str
                + "<book id='2'><Name>Linux</Name><price>100</price></book></books>";
        // 生成一个Document
        Document document = null;
        try {
            document = DocumentHelper.parseText(str);
            Element book = (Element) document
                    .selectSingleNode("/books/book[@id='2']");
            System.out.println(book.asXML());
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }

    //第二种：根据节点名来查找
    //结果为：Java,Linux,
    public void readXMLElement() {
        String str = "<books><book id='1'><Name>Java</Name><price>100</price></book>";
        str = str
                + "<book id='2'><Name>Linux</Name><price>100</price></book></books>";
        Document document = null;
        try {
            document = DocumentHelper.parseText(str);
            List names = document.selectNodes("//Name");// 记得这边是双斜杠且有区分大小写
            for (int i = 0; i < names.size(); i++) {
                System.out.print(((Element) names.get(i)).getText() + ",");
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }

    //第三种：遍历整个XML取得属于指定类型节点的记录
    //结果为：1 Java 100
    //       2 Linux 100
    public void readXMLAllElement() {
        String str = "<books><book id='1'><Name>Java</Name><price>100</price></book>";
        str = str
                + "<book id='2'><Name>Linux</Name><price>100</price></book></books>";
        Document document = null;
        try {
            document = DocumentHelper.parseText(str);
            Iterator it = document.getRootElement().elementIterator();
            Element element = null;
            while (it.hasNext()) {
                element = (Element) it.next();
                if (element.getName().equals("book")) {
                    System.out.print(element.attributeValue("id") + " ");
                    System.out.print(element.element("Name").getText() + " ");
                    System.out.println(element.element("price").getText());
                }
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }

    //第四种：遍历所有属性
    //结果为：id:1
    //       name:Java
    //       price:120
    public void readXMLAllAttr() {
        String str = "<book id='1' name='Java' price='120'/>";
        Document document;
        try {
            document = DocumentHelper.parseText(str);
            Iterator attributes = document.getRootElement().attributeIterator();
            while (attributes.hasNext()) {
                Attribute attribute = (Attribute) attributes.next();
                System.out.println(attribute.getName() + ":"
                        + attribute.getValue());
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }

}