dom4j

package xml.dom4j.wkjava;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;import java.io.IOException;
import java.io.InputStream;import java.io.OutputStreamWriter;
import java.io.Writer;import java.util.Iterator;import java.util.List;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class Test {

Document doc = null;
public Test() throws DocumentException, IOException, SAXException   {    
Document doc = loadXML("class.xml"); //载入XML文档
        System.out.println(doc.asXML());
       printDoc(doc); //打印XML文档  
        storeDoc(doc,"new.xml"); //把XML文档存入硬盘
       doc = valideDoc("class.xml");  //校验dtd XML文档   
       printDoc(doc);    
      doc = validateDocBySxd("classSchema.xml"); //校验Schema文档printDoc(doc);    
String url = getClass().getResource("/xml/dom4j/wkjava/class.xsd").toString();  
  doc = validateDocBySxd("classSchema.xml",url); //校验Schema文档（俩参数）   
printDoc(doc);  
   doc = createDoc(); //创建Schema文档  
storeDoc(doc,"root.xml");   
  doc = validateDocBySxd("classSchema.xml"); 
   updateZip(doc,"102202"); //在文档中修改原属  
printDoc(doc);    
doc = validateDocBySxd("classSchema.xml"); 
   printNames(doc);  //打印文档中所有学生名字  
System.out.println(getStudentCount(doc));  }
public static void main(String[] args) {
try {new Test(); }
catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} }
public Document loadXML(String xmlfile)throws FileNotFoundException, DocumentException{  
  SAXReader reader = new SAXReader();
    doc = reader.read(new FileInputStream(xmlfile));
    return doc;
}
public void printDoc(Document doc) throws IOException {    Writer out = new OutputStreamWriter(System.out,"gb2312");     OutputFormat format = OutputFormat.createPrettyPrint();     XMLWriter writer = new XMLWriter(out, format);     writer.write(this.doc);  
  out.flush();
}    
public void storeDoc(Document doc,String filename) throws IOException {   
Writer out = new OutputStreamWriter(new FileOutputStream (filename),"utf-8");  
  OutputFormat format = OutputFormat.createPrettyPrint();       XMLWriter writer = new XMLWriter(out, format);      writer.write(this.doc);   
printDoc(doc);   
out.close();
} 
  public Document valideDoc(String xmlfile) throws DocumentException, IOException{   
EntityResolver resolver = new EntityResolver()
{
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
if(publicId.equals("//class from weiking")){ InputStream in = new FileInputStream("class.dtd"); return new InputSource(in);
}
return null;
}};   
SAXReader reader = new SAXReader(true);    reader.setEntityResolver(resolver);   
Document doc = reader.read(new FileInputStream(xmlfile));    return doc;  
}     
  public Document validateDocBySxd(String xmlfile) throws SAXException, DocumentException, IOException{   
SAXReader reader = new SAXReader(true);   
reader.setFeature("http://apache.org/xml/features/validation/schema",true);    Document doc = reader.read(new FileInputStream(xmlfile));    return doc;  
}     
  public Document validateDocBySxd(String xmlfile,String SchemaUrl) throws SAXException, FileNotFoundException, DocumentException{   
SAXReader reader = new SAXReader(true);   
reader.setFeature("http://xml.org/sax/features/validation", true); reader.setFeature("http://apache.org/xml/features/validation/schema",true); reader.setFeature("http://apache.org/xml/features/validation/schema-full-checking",true);
reader.setProperty("http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation",SchemaUrl);   
Document doc = reader.read(new FileInputStream(xmlfile));    return doc;  
}      
public Document createDoc() {     
  Document doc = DocumentHelper.createDocument();    
   Element root = doc.addElement( "root" );     
  Element author2 = root.addElement( "author" ) .addAttribute( "name", "Toby" )  .addAttribute( "location", "Germany" ) .addText( "Tobias Rademacher" );     
  Element author1 = root.addElement( "author" ).addAttribute( "name", "James" ).addAttribute( "location", "UK" ).addText( "James Strachan" ); 
return doc;
}   
public void updateZip(Document doc,String zip){
String xpath = "/Class/Teacher/zip";   
Element e = (Element)doc.selectSingleNode(xpath);    e.setText(zip);   
}     
  public void printNames(Document doc){  
String xpath = "/Class/Students/Student/name";   
List list = doc.selectNodes(xpath);   
for(Iterator i = list.iterator();i.hasNext();)
{ Element e = (Element)i.next();   
System.out.println(e.element("last").getText() + e.valueOf("first"));   
}  
}      
public int getStudentCount(Document doc){   
int count = 0;  
String xpath ="count(/Class/Students/Student)";  
count = doc.numberValueOf(xpath).intValue();//    String value = doc.valueOf(xpath);//   
count = Integer.parseInt(value); 
  return count;
}
}