au585是什么金值钱吗:java操作xml增删改查
来源:百度文库 编辑:偶看新闻 时间:2024/04/26 17:11:34
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
Java代码
2:处理xml的java类HandleXML.java
Java代码
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
Java代码
- "1.0" encoding="UTF-8" ?>
TigerLee 26 男 - 北京海淀
Snow 24 女 - 山东
TigerLee 26 男 北京海淀Snow 24 女 山东
2:处理xml的java类HandleXML.java
Java代码
- package com.tigerlee.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 TigerLee
- *
- */
- public class HandleXML {
- /**
- * 采用DOM方式
- * @author TigerLee
- *
- */
- 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;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;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;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;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 TigerLee
- *
- */
- 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 TigerLee
- *
- */
- public class JDOMForXml{
- }
- /**
- * 采用DOM4J方式
- * @author TigerLee
- *
- */
- 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;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;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);
- }
- }
- }
package com.tigerlee.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 TigerLee * */ public class HandleXML { /** * 采用DOM方式 * @author TigerLee * */ 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;i
3:接下来是测试的java文件 TestXml.java
Java代码
- package com.tigerlee.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
- //domForXml.addNewNode("Sun", "20", "Man", "USA");
- //删除
- //domForXml.deleteNode("sun");
- domForXml.updateNode("TigerLee");
- }
- @Test
- public void testSAXForXml() throws Exception{
- HandleXML handleXml = new HandleXML();
- HandleXML.SAXForXml saxForXml = handleXml.new SAXForXml();
- SAXParserFactory saxFactory = SAXParserFactory.newInstance();
- javax.xml.parsers.SAXParser sp = saxFactory.newSAXParser();
- sp.parse(new File("student.xml"), saxForXml);
- Map contents = saxForXml.getContents();
- Iterator keys = contents.keySet().iterator();
- while(keys.hasNext()){
- String key = (String)keys.next();
- System.out.println(key+":"+contents.get(key));
- }
- }
- @Test
- public void testDom4jForXml(){
- HandleXML handleXml = new HandleXML();
- HandleXML.DOM4JForXml dom4j = handleXml.new DOM4JForXml();
- //解析xml
- dom4j.readXml("student.xml");
- Map newValue = new HashMap();
- newValue.put("age","26");
- dom4j.updateXml("TigerLee", newValue, "student.xml");
- }
- }
package com.tigerlee.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 //domForXml.addNewNode("Sun", "20", "Man", "USA"); //删除 //domForXml.deleteNode("sun"); domForXml.updateNode("TigerLee"); } @Test public void testSAXForXml() throws Exception{ HandleXML handleXml = new HandleXML(); HandleXML.SAXForXml saxForXml = handleXml.new SAXForXml(); SAXParserFactory saxFactory = SAXParserFactory.newInstance(); javax.xml.parsers.SAXParser sp = saxFactory.newSAXParser(); sp.parse(new File("student.xml"), saxForXml); Map contents = saxForXml.getContents(); Iterator keys = contents.keySet().iterator(); while(keys.hasNext()){ String key = (String)keys.next(); System.out.println(key+":"+contents.get(key)); } } @Test public void testDom4jForXml(){ HandleXML handleXml = new HandleXML(); HandleXML.DOM4JForXml dom4j = handleXml.new DOM4JForXml(); //解析xml dom4j.readXml("student.xml"); Map newValue = new HashMap(); newValue.put("age","26"); dom4j.updateXml("TigerLee", newValue, "student.xml"); } }
以上是自己总结的一些处理xml的方式,~~在处理xml的类中使用了内部类,测试类使用的是简单的单元测试方式。
例子中使用的jar包:
dom.jar
xercesImpl.jar
dom4j-1.6.1.jar
jaxen-1.1.1.jar
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