JDOM解析XML简单应用

最新推荐文章于 2024-08-26 16:16:01 发布

Andy_Dou

最新推荐文章于 2024-08-26 16:16:01 发布

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分类专栏： JAVA 文章标签： XML

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本文介绍了一个Java工具类，用于实现对XML文件的基本操作，包括查询、更新、删除及创建节点等功能。该工具类使用JDOM库解析XML，并提供了一系列方法来简化这些常见任务。

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import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class StoryXml {
	/**
	 * 查询ID是否存在
	 * @param path xml文件绝对路径
	 * @param id 节点id
	 * @return
	 * @throws IOException 
	 * @throws JDOMException 
	 */
	@SuppressWarnings("unchecked")
	public static boolean findElementByIdInXml(String path, String id) throws JDOMException, IOException {
		SAXBuilder saxbuilder = new SAXBuilder();
		Document doc = saxbuilder.build(new File(path));
		Element root = doc.getRootElement();
		List<Element> list = root.getChildren();
		for (Element e : list) {
			if(e.getAttributeValue("id").equalsIgnoreCase(id)) {
				return true;
			}
		}
		return false;
	}
	
	/**
	 * 更新指定ID的XML
	 * @param path xml文件绝对路径
	 * @param id 节点id
	 * @param imgpath 新图片路径
	 * @param description 图片描述
	 * @throws JDOMException
	 * @throws IOException
	 */
	@SuppressWarnings("unchecked")
	public static void updateElementById(String path, String id, String imgpath, String description) throws JDOMException, IOException {
		SAXBuilder builder = new SAXBuilder();
		Document doc = builder.build(new File(path));
		Element element = doc.getRootElement();
		List<Element> list = element.getChildren();
		Element image = null;
		Element des = null;
		for(Element e : list){
			if(e.getAttributeValue("id").equalsIgnoreCase(id)) {
				image = e.getChild("image");
				image.setText(imgpath);
				des = e.getChild("description");
				des.setText(description);
			}
		}
		XMLOutputter out = new XMLOutputter();
		out.setFormat(Format.getPrettyFormat().setEncoding("utf-8"));
		out.output(doc, new FileOutputStream(path));
	}

	/**
	 * 删除指定编号的节点
	 * @param path xml文件路径
	 * @param id 结点id
	 * @throws IOException 
	 * @throws JDOMException 
	 */
	@SuppressWarnings("unchecked")
	public static void removeElement(String path, String id) throws JDOMException, IOException {
		SAXBuilder builder = new SAXBuilder();
		Document doc =  builder.build(new File(path));;
		Element root=doc.getRootElement();
		List<Element> childs = root.getChildren();
		for(Element e : childs){
			if(id.equalsIgnoreCase(e.getAttributeValue("id"))){
				root.removeContent(e);
				break;
			}
		}
		XMLOutputter out = new XMLOutputter();
		out.setFormat(Format.getPrettyFormat().setEncoding("utf-8"));
		out.output(doc, new FileOutputStream(path));
	}

	/**
	 * 创建新节点
	 * @param path
	 * @param id
	 * @param imgpath
	 * @param description
	 * @throws IOException 
	 * @throws JDOMException 
	 */
	public static void createElement(String path, String id, String imgpath, String description) throws JDOMException, IOException {
		Element fish_node = new Element("thumb");
		Element fish_node_image = new Element("image");
		Element fish_node_description = new Element("description");
		fish_node_image.addContent(imgpath);
		fish_node_description.addContent(description);
		fish_node.addContent(0, fish_node_image);
		fish_node.addContent(1, fish_node_description);
		fish_node.setAttribute("id", id);
		fish_node.setAttribute("displayNum", "10");
		fish_node.setAttribute("separation", "5");
		
		SAXBuilder builder = new SAXBuilder();
		Document doc =  builder.build(new File(path));
		Element root=doc.getRootElement();
		root.addContent(fish_node);
		XMLOutputter out = new XMLOutputter();
		out.setFormat(Format.getPrettyFormat().setEncoding("utf-8"));
		out.output(doc, new FileOutputStream(path));
	}
}