Java-Dom4jHelper工具类

mac2022-06-30 107

import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.IOException; import java.io.OutputStreamWriter; import java.net.URL; 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; import org.dom4j.Node; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; public class Dom4jHelper { /** * 解析url xml文档 * @param url * @return * @throws DocumentException */ public Document parse(URL url) throws DocumentException { SAXReader reader = new SAXReader(); Document document = reader.read(url); return document; } /** * 遍历解析文档 * @param document */ public void treeWalk(Document document) { treeWalk( document.getRootElement() ); } /** * 遍历解析元素 * @param element */ public void treeWalk(Element element) { for ( int i = 0, size = element.nodeCount(); i < size; i++ ) { Node node = element.node(i); if ( node instanceof Element ) { treeWalk( (Element) node ); } else { // 处理.... } } } /** * 解析文件，获得根元素 * @param xmlPath * @param encoding * @return * @throws Exception */ public static Element parse(String xmlPath,String encoding)throws Exception{ //文件是否存在 File file = new File(xmlPath); if(!file.exists()){ throw new Exception("找不到xml文件："+xmlPath); } //解析 SAXReader reader = new SAXReader(false); Document doc = reader.read(new FileInputStream(file),encoding); Element root = doc.getRootElement(); return root; } /** * 保存文档 * @param doc * @param xmlPath * @param encoding * @throws Exception */ public static void save(Document doc,String xmlPath,String encoding)throws Exception{ OutputFormat format=OutputFormat.createPrettyPrint(); format.setEncoding(encoding); XMLWriter writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream(xmlPath),encoding),format); writer.write(doc); writer.flush(); writer.close(); } /** * 修改xml某节点的值 * @param inputXml 原xml文件 * @param nodes 要修改的节点 * @param attributename 属性名称 * @param value 新值 * @param outXml 输出文件路径及文件名如果输出文件为null，则默认为原xml文件 */ public static void modifyDocument(File inputXml, String nodes, String attributename, String value, String outXml) { try { SAXReader saxReader = new SAXReader(); Document document = saxReader.read(inputXml); List list = document.selectNodes(nodes); Iterator iter = list.iterator(); while (iter.hasNext()) { Attribute attribute = (Attribute) iter.next(); if (attribute.getName().equals(attributename)) attribute.setValue(value); } XMLWriter output; if (outXml != null){ //指定输出文件 output = new XMLWriter(new FileWriter(new File(outXml))); }else{ //输出文件为原文件 output = new XMLWriter(new FileWriter(inputXml)); } output.write(document); output.close(); } catch (DocumentException e) { System.out.println(e.getMessage()); } catch (IOException e) { System.out.println(e.getMessage()); } } /** * xml转换为字符串 * @param doc * @param encoding * @return * @throws Exception */ public static String toString(Document doc,String encoding)throws Exception{ OutputFormat format=OutputFormat.createPrettyPrint(); format.setEncoding(encoding); ByteArrayOutputStream byteOS=new ByteArrayOutputStream(); XMLWriter writer = new XMLWriter(new OutputStreamWriter(byteOS,encoding),format); writer.write(doc); writer.flush(); writer.close(); writer=null; return byteOS.toString(encoding); } /** * 字符串转换为Document * @param text * @return * @throws DocumentException */ public static Document str2Document(String text) throws DocumentException{ Document document = DocumentHelper.parseText(text); return document; } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub } }

转载于:https://www.cnblogs.com/bilaisheng/p/10210973.html