java操作xml增删改查.doc

java操作xml增删改查1：DOM4J性能最好，连Sun的JAXM也在用DOM4J.目前许多开源项目中大量采用DOM4J，例如大名鼎鼎的Hibernate也用DOM4J来读取XML配置文件。如果不考虑可移植性，那就采用DOM4J. 2：JDOM 和DOM在性能测试时表现不佳，在测试10M文档时内存溢出。在小文档情况下还值得考虑使用DOM和JDOM.虽然JDOM的开发者已经说明他们期望在正式发行版前专注性能问题，但是从性能观点来看，它确实没有值得推荐之处。另外，DOM仍是一个非常好的选择。DOM实现广泛应用于多种编程语言。它还是许多其它与XML相关的标准的基础，因为它正式获得W3C推荐（与基于非标准的Java模型相对），所以在某些类型的项目中可能也需要它（如在 JavaScript中使用DOM）。 3：SAX表现较好，这要依赖于它特定的解析方式事件驱动。一个SAX检测即将到来的XML 流，但并没有载入到内存（当然当XML流被读入时，会有部分文档暂时隐藏在内存中）。 接下来我来展示以下用这四种方式处理xml的一个简单的例子，希望能给大家一些帮助。 1：要操作的xml文件：student.xml Stone 26 男 北京海淀 Snow 24 女 山东 2：处理xml的java类HandleXML.java package com.stone.xml; import java.io.File; import java.io.FileWriter; import java.io.Writer; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.Set; import java.util.Stack; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; /* * * 在XML文档中实现增、删、改、查 * author Stone * */ public class HandleXML /* * 采用DOM方式 * author Stone * */ public class DOMForXml /* * 获得doc对象 * param fileName * return */ public Document getDocument(String fileName) Document document = null; try DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); document = builder.parse(new File(fileName); catch(Exception e) e.printStackTrace(); return document; /* * 将改动持久到文件 * param doc * param distFileName */ public void modifyFile(Document doc,String distFileName) try TransformerFactory tf = TransformerFactory.newInstance(); Transformer tfer = tf.newTransformer(); DOMSource dsource = new DOMSource(doc); StreamResult sr = new StreamResult(new File(student.xml); tfer.transform(dsource, sr); catch(Exception e) e.printStackTrace(); /* * 解析 * param fileName */ public void paseXml(String fileName) Document document = getDocument(fileName); NodeList nodeList = document.getElementsByTagName(student); for(int i=0;inodeList.getLength();i+) StringBuilder sb = new StringBuilder(); sb.append(姓名：+document.getElementsByTagName(name).item(i).getFirstChild().getNodeValue(); sb.append( , ); sb.append(年龄：+document.getElementsByTagName(age).item(i).getFirstChild().getNodeValue(); sb.append( , ); sb.append(性别：+document.getElementsByTagName(sex).item(i).getFirstChild().getNodeValue(); sb.append( , ); sb.append(地址：+document.getElementsByTagName(address).item(i).getFirstChild().getNodeValue(); System.out.println(sb.toString(); /* * 创建一个新的学生 * param name * param age * param sex * param address */ public void addNewNode(String name,String age,String sex,String address) try Document document = getDocument(student.xml); NodeList nodeList = document.getElementsByTagName(students); /创建新的节点 Node studentNode = document.createElement(student); Node nameNode = document.createElement(name); nameNode.appendChild(document.createTextNode(name); Node ageNode = document.createElement(age); ageNode.appendChild(document.createTextNode(age); Node sexNode = document.createElement(sex); sexNode.appendChild(document.createTextNode(sex); Node addressNode = document.createElement(address); addressNode.appendChild(document.createTextNode(address); / 添加节点 studentNode.appendChild(nameNode); studentNode.appendChild(ageNode); studentNode.appendChild(sexNode); studentNode.appendChild(addressNode); nodeList.item(0).appendChild(studentNode); / 此时真正的处理将新数据添加到文件中（磁盘） TransformerFactory tf = TransformerFactory.newInstance(); Transformer tfer = tf.newTransformer(); DOMSource dsource = new DOMSource(document); StreamResult sr = new StreamResult(new File(student.xml); tfer.transform(dsource, sr); catch(Exception e) e.printStackTrace(); paseXml(student.xml); /* * 删除一个节点 * param name */ public void deleteNode(String name) Document document = getDocument(student.xml); NodeList nodeList = document.getElementsByTagName(name); for(int i=0;inodeList.getLength();i+) String value = nodeList.item(i).getFirstChild().getTextContent(); if(name!=null & name.equalsIgnoreCase(value) Node parentNode = nodeList.item(i).getParentNode(); document.getFirstChild().removeChild(parentNode); modifyFile(document,student.xml); /* * 根据name修改某个节点的内容 * param name */ public void updateNode(String name) Document document = getDocument(student.xml); NodeList nodeList = document.getElementsByTagName(name); for(int i=0;inodeList.getLength();i+) String value = nodeList.item(i).getFirstChild().getTextContent(); if(name!=null & name.equalsIgnoreCase(value) Node parentNode = nodeList.item(i).getParentNode(); NodeList nl = parentNode.getChildNodes(); for(int j=0;jnl.getLength();j+) String modifyNode= nl.item(j).getNodeName(); if(modifyNode.equalsIgnoreCase(age) nl.item(j).getFirstChild().setTextContent(25); modifyFile(document,student.xml); /* * 采用SAX方式 * author Stone * */ public class SAXForXml extends DefaultHandler private Stack tags = new Stack(); private Map contents = new LinkedHashMap(); public int count = 0; Override public void characters(char ch, int start, int length) throws SAXException String tag = (String)tags.peek(); if(name.equals(tag) String name = new String(ch,start,length); contents.put(name+count,name); if(age.equals(tag) contents.put(age+count,new String(ch,start,length); if(sex.equals(tag) contents.put(sex+count,new String(ch,start,length); if(address.equals(tag) contents.put(address+count,new String(ch,start,length); Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException if(student.equals(qName) count+; tags.push(qName); Override public void endElement(String uri, String localName, String qName) throws SAXException tags.pop(); public Map getContents() return contents; /* * 采用JDOM方式 * author Stone * */ public class JDOMForXml /* * 采用DOM4J方式 * author Stone * */ public class DOM4JForXml /* * 获取doc对象（org.dom4j.Document） * param fileName * return */ public org.dom4j.Document getDocument(String fileName) SAXReader sr = new SAXReader(); org.dom4j.Document doc = null; try doc = sr.read(new File(fileName); catch (Exception e) e.printStackTrace(); return doc; /* * 将文件保存到硬盘 * param doc * param fileName */ public void writeToFile(org.dom4j.Document doc,String fileName) try Writer writer = new FileWriter(fileName); OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding(UTF-8); XMLWriter xmlWriter = new XMLWriter(writer, format); xmlWriter.write(doc); xmlWriter.close(); System.out.println( 文件已经钝化！); catch (Exception e) e.printStackTrace(); /* * 遍历xml文件输出节点值 * * param fileName */ public void readXml(String fileName) org.dom4j.Document doc = getDocument(fileName); List nameList = doc.selectNodes(/students/student/name); List ageList = doc.selectNodes(/students/student/age); List sexList = doc.selectNodes(/students/student/sex); List addressList = doc.selectNodes(/students/student/address); for(int i=0;inameList.size();i+) StringBuilder sb = new StringBuilder(); sb.append(name=+(Element)nameList.get(i).getTextTrim(); sb.append(,age=+(Element)ageList.get(i).getTextTrim(); sb.append(,sex=+(Element)sexList.get(i).getTextTrim(); sb.append(,address=+(Element)addressList.get(i).getTextTrim(); System.out.println(sb.toString(); /* * 根据姓名修改一个学生的信息 * param name * param newValue * param fileName */ public void updateXml(String name,Map newValue,String fileName) org.dom4j.Document doc = getDocument(fileName); List nameList = doc.selectNodes(/students/student/name); Iterator iterator = nameList.iterator(); while(iterator.hasNext() Element element = (Element)iterator.next(); if(name!=null & name.equals(element.getText() Element pe = element.getParent(); List childList = pe.elements(); for(int i=0;ichildList.size();i+) Iterator valueSet = newValue.entrySet().iterator(); while(valueSet.hasNext() Map.Entry entry = (Map.Entry)valueSet.next(); String nodeName = (Element)childList.get(i).getName(); String key = entry.getKey().toString(); if(key!=null & key.equals(nodeName) (Element)childList.get(i).setText(String)entry.getValue(); writeToFile(doc, fileName); 3:接下来是测试的java文件 TestXml.java package com.stone.xml; import java.io.File; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Set; import javax.xml.parsers.SAXParserFactory; import org.junit.Test; public class TestXml Test public void testDomForXml() HandleXML handleXml = new HandleXML(); HandleXML.DOMForXml domForXml = handleXml.new DOMForXml(); /解析 /domForXml.paseXml(student.xml); / 新增 /