import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;// JAXP
import javax.xml.XMLConstants;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;// DOM
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;public class TestDOMValidation { public static void main(String[] args) {
try {
if (args.length != 2) {
System.err.println ("Usage: java TestDOMValidation " +
"[xml filename] [schema filename]");
System.exit (1);
} // Get Document Builder Factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); // Leave off validation, and turn off namespaces
factory.setValidating(false);
factory.setNamespaceAware(false); DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new File(args[0])); // Handle validation
SchemaFactory constraintFactory =
SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Source constraints = new StreamSource(new File(args[1]));
Schema schema = constraintFactory.newSchema(constraints);
Validator validator = schema.newValidator(); // Validate the DOM tree
try {
validator.validate(new DOMSource(doc));
System.out.println("Document validates fine.");
} catch (org.xml.sax.SAXException e) {
System.out.println("Validation error: " + e.getMessage());
} } catch (ParserConfigurationException e) {
System.out.println("The underlying parser does not support the requested features.");
} catch (FactoryConfigurationError e) {
System.out.println("Error occurred obtaining Document Builder Factory.");
} catch (Exception e) {
e.printStackTrace();
}
} private static void printNode(Node node, String indent) {
switch (node.getNodeType()) {
case Node.DOCUMENT_NODE:
System.out.println("<xml version=\"1.0\">\n");
// recurse on each child
NodeList nodes = node.getChildNodes();
if (nodes != null) {
for (int i=0; i<nodes.getLength(); i++) {
printNode(nodes.item(i), "");
}
}
break;
case Node.ELEMENT_NODE:
String name = node.getNodeName();
System.out.print(indent + "<" + name);
NamedNodeMap attributes = node.getAttributes();
for (int i=0; i<attributes.getLength(); i++) {
Node current = attributes.item(i);
System.out.print(" " + current.getNodeName() +
"=\"" + current.getNodeValue() +
"\"");
}
System.out.print(">");
// recurse on each child
NodeList children = node.getChildNodes();
if (children != null) {
for (int i=0; i<children.getLength(); i++) {
printNode(children.item(i), indent + " ");
}
}
System.out.print("</" + name + ">");
break; case Node.TEXT_NODE:
System.out.print(node.getNodeValue());
break;
}
}}例子
import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;// JAXP
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;// DOM
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;public class TestDOMParsing { public static void main(String[] args) {
try {
if (args.length != 1) {
System.err.println ("Usage: java TestDOMParsing [filename]");
System.exit (1);
} // Get Document Builder Factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); // Leave off validation, and turn off namespaces
factory.setValidating(false);
factory.setNamespaceAware(false); DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new File(args[0])); // Print the document from the DOM tree and
// feed it an initial indentation of nothing
printNode(doc, ""); } catch (ParserConfigurationException e) {
System.out.println("The underlying parser does not support the requested features.");
} catch (FactoryConfigurationError e) {
System.out.println("Error occurred obtaining Document Builder Factory.");
} catch (Exception e) {
e.printStackTrace();
}
} private static void printNode(Node node, String indent) {
switch (node.getNodeType()) {
case Node.DOCUMENT_NODE:
System.out.println("<xml version=\"1.0\">\n");
// recurse on each child
NodeList nodes = node.getChildNodes();
if (nodes != null) {
for (int i=0; i<nodes.getLength(); i++) {
printNode(nodes.item(i), "");
}
}
break;
case Node.ELEMENT_NODE:
String name = node.getNodeName();
System.out.print(indent + "<" + name);
NamedNodeMap attributes = node.getAttributes();
for (int i=0; i<attributes.getLength(); i++) {
Node current = attributes.item(i);
System.out.print(" " + current.getNodeName() +
"=\"" + current.getNodeValue() +
"\"");
}
System.out.print(">");
// recurse on each child
NodeList children = node.getChildNodes();
if (children != null) {
for (int i=0; i<children.getLength(); i++) {
printNode(children.item(i), indent + " ");
}
}
System.out.print("</" + name + ">");
break; case Node.TEXT_NODE:
System.out.print(node.getNodeValue());
break;
}
}}
<students>
<student age="25"><!--如果没有age属性，默认的为20-->
<name>崔卫兵</name>
<college>PC学院</college>
<telephone>62354666</telephone>
<notes>男,1982年生,硕士，现就读于北京邮电大学</notes>
</student>
<student>
<name>cwb</name>
<college leader="学院领导">PC学院</college><!--如果没有leader属性，默认的为leader-->
<telephone>62358888</telephone>
<notes>男,1987年生,硕士，现就读于中国农业大学</notes>
</student>
<student age="45">
<name>xxxxx</name>
<college leader="">xxx学院</college>
<telephone>66666666</telephone>
<notes>注视中，注释中</notes>
</student>
<student age="">
<name>lxx</name>
<college>yyyy学院</college>
<telephone>88888888</telephone>
<notes>注视中111，注释中222</notes>
</student>
</students>
package wxxr.csdn.test.test;import java.io.File;
import java.util.HashMap;
import java.util.Iterator;import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;/**
* 利用dom4j进行XML编程
*
* @author cuiweibing
* @since 2007.8.10
*/
public class Dom4jReadExmple {
/**
* 遍历整个XML文件，获取所有节点的值与其属性的值，并放入HashMap中
*
* @param filename
* String 待遍历的XML文件（相对路径或者绝对路径）
* @param hm
* HashMap 存放遍历结果，格式：<nodename,nodevalue>或者<nodename+attrname,attrvalue>
*/
public void iterateWholeXML(String filename, HashMap<String, String> hm) {
SAXReader saxReader = new SAXReader();
try {
Document document = saxReader.read(new File(filename));
Element root = document.getRootElement();
// 用于记录学生编号的变量
int num = -1;
// 遍历根结点（students）的所有孩子节点（肯定是student节点）
for (Iterator iter = root.elementIterator(); iter.hasNext();) {
Element element = (Element) iter.next();
num++;
// 获取person节点的age属性的值
Attribute ageAttr = element.attribute("age");
if (ageAttr != null) {
String age = ageAttr.getValue();
if (age != null && !age.equals("")) {
hm.put(element.getName() + "-" + ageAttr.getName()+ num, age);
} else {
hm.put(element.getName() + "-" + ageAttr.getName()+ num, "20");
}
} else {
hm.put(element.getName() + "-age" + num, "20");
}
// 遍历student结点的所有孩子节点（即name，college，telphone，notes），并进行处理
for (Iterator iterInner = element.elementIterator(); iterInner
.hasNext();) {
Element elementInner = (Element) iterInner.next();
if (elementInner.getName().equals("college")) {
hm.put(elementInner.getName() + num, elementInner.getText());
// 获取college节点的leader属性的值
Attribute leaderAttr = elementInner.attribute("leader");
if (leaderAttr != null) {
String leader = leaderAttr.getValue();
if (leader != null && !leader.equals("")) {
hm.put(elementInner.getName() + "-"+ leaderAttr.getName() + num, leader);
} else {
hm.put(elementInner.getName() + "-"+ leaderAttr.getName() + num, "leader");
}
} else {
hm.put(elementInner.getName() + "-leader" + num,"leader");
}
} else {
hm.put(elementInner.getName() + num, elementInner.getText());
}
}
} } catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
import java.io.IOException;
import java.io.Writer;import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;public class Dom4JXML {
public void createXML() {
//用工厂类创建一个document实例
Document doc = DocumentHelper.createDocument();
//创建根元素emps
Element rootEle = doc.addElement("emps");
//添加注释
rootEle.addComment("这是一个dom4j生成的xml文件");
//emps根节点下创建一个emp节点
Element empEle = rootEle.addElement("emp");
//emp添加属性id="1"
empEle.addAttribute("id", "1");
//emp节点下创建一个name节点
Element nameEle = empEle.addElement("name");
//name节点下创建一个文本节点zhangsan
nameEle.setText("zhangsan");
//再为name节点创建一个兄弟节点
Element sexEle = empEle.addElement("sex");
sexEle.setText("man");
//将document中的内容写入文件中
try {
Writer out = new FileWriter("F:\\emps.xml");
//格式化输出,类型IE浏览一样
OutputFormat format = OutputFormat.createPrettyPrint();
//OutputFormat format = OutputFormat.createCompactFormat();
format.setEncoding("UTF-8");
//创建写出对象
XMLWriter writer = new XMLWriter(out,format);
writer.write(doc);
writer.close();
System.out.println("生成emps.xml成功。");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("失败了。");
}
}
public static void main(String[] args) {
new Dom4JXML().createXML();
}}文档内容：
<?xml version="1.0" encoding="UTF-8"?><emps>
<!--这是一个dom4j生成的xml文件-->
<emp id="1">
<name>zhangsan</name>
<sex>man</sex>
</emp>
</emps>