学步园

package action.communication;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

/**
 * 使用dom4j操作XML文件的工具类
 * 
 * @author Administrater
 * 
 */
public class XMLUtil {
	/**
	 * 在指定路径下创建一个xml文件
	 * 
	 * @param filePath
	 *            路径，如C:\test.xml
	 */
	public static void createXMLFile(String filePath) {
		File file = new File(filePath);
		// 判断该文件是否存在，不存在则创建
		if (!file.exists()) {
			try {
				file.createNewFile();
				//System.out.println("===");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		Document document = DocumentHelper.createDocument();// 建立document对象，用来操作xml文件
		Element booksElement = document.addElement("books");// 建立根节点
		booksElement.addComment("This is a test for dom4j ");// 加入一行注释
		Element bookElement = booksElement.addElement("book");// 添加一个book节点
		bookElement.addAttribute("show", "yes");// 添加属性内容
		Element titleElement = bookElement.addElement("title");// 添加文本节点
		titleElement.setText("ajax in action");// 添加文本内容
		try {
			XMLWriter writer = new XMLWriter(new FileWriter(file));
			writer.write(document);
			writer.close();
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	// 修改节点的属性
	public static void modifyXMLFileNodeAttr() {
		String oldStr = "c:/test.xml";
		Document document = null;
		// 修改节点的属性
		try {
			SAXReader saxReader = new SAXReader(); // 用来读取xml文档
			document = saxReader.read(new File(oldStr)); // 读取xml文档
			List list = document.selectNodes("/books/book/@show");// 用xpath查找节点book的属性
			System.out.println(list);
			Iterator iter = list.iterator();
			while (iter.hasNext()) {
				Attribute attribute = (Attribute) iter.next();
				if (attribute.getValue().equals("yes")) {
					attribute.setValue("no");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		try {
			XMLWriter writer = new XMLWriter(new FileWriter(new File(oldStr)));
			writer.write(document);
			writer.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	// 修改节点的内容
	public static void modifyXMLFileNodeText() {
		String oldStr = "c:/test.xml";
		Document document = null;
		// 修改节点的内容
		try {
			SAXReader saxReader = new SAXReader(); // 用来读取xml文档
			document = saxReader.read(new File(oldStr)); // 读取xml文档
			List list = document.selectNodes("/books/book/title");// 用xpath查找节点book的内容
			Iterator iter = list.iterator();
			while (iter.hasNext()) {
				Element element = (Element) iter.next();
				element.setText("哈哈哈");// 设置相应的内容
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		try {
			XMLWriter writer = new XMLWriter(new FileWriter(new File(oldStr)));
			writer.write(document);
			writer.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	//删除某节点
	public static void removeNode() {
		String oldStr = "c:/test.xml";
		Document document = null;
		try {
			SAXReader saxReader = new SAXReader();// 用来读取xml文档
			document = saxReader.read(new File(oldStr));// 读取xml文档
			List list = document.selectNodes("/books/book");// 用xpath查找对象
			Iterator iter = list.iterator();
			while (iter.hasNext()) {
				Element bookElement = (Element) iter.next();
				// 创建迭代器，用来查找要删除的节点,迭代器相当于指针，指向book下所有的title节点
				Iterator iterator = bookElement.elementIterator("title");
				while (iterator.hasNext()) {
					Element titleElement = (Element) iterator.next();
					if (titleElement.getText().equals("哈哈哈")) {
						bookElement.remove(titleElement);
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		try {
			XMLWriter writer = new XMLWriter(new FileWriter(new File(oldStr)));
			writer.write(document);
			writer.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}
	
	
	public static void main(String[] args) {
		//XMLUtil.createXMLFile("c:/test.xml");
		//XMLUtil.modifyXMLFileNodeAttr();
		//XMLUtil.modifyXMLFileNodeText();
		//XMLUtil.removeNode();
	}
}

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