dom4j的基本操作

# 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 MyTest {
#   Document doc = null;
#
#   public MyTest() 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 MyTest();
#     } 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;
#   }
# }