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<?xml version="1.0" encoding="gb2312"?>
<roster>
  <student ID="s101">
    <name>李华</name>
    <sex>男</sex>
    <birthday>1978.9.12</birthday>
    <score>92</score>
    <skill>Java</skill>
    <skill>Oracle</skill>
    <skill>C Sharp</skill>
    <skill>SQL Server</skill>
  </student>
  <student ID="s101">
    <name>齐辉</name>
    <sex>女</sex>
    <birthday>1979.3.2</birthday>
    <score>90</score>
    <skill>Java</skill>
    <skill>Oracle</skill>
  </student>
</roster>

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import java.io.*;
import org.w3c.dom.*;
import org.w3c.dom.Node;
import org.xml.sax.*;
import org.apache.xerces.parsers.*;
 
public class DOMSample {
  public static void main(String []argv){
    try {
      if (argv.length != 1){
        System.err.println("Usage: java DOMSample filename");
        System.exit(1);
      }
      BufferedReader in = new BufferedReader(new FileReader(argv[0]));
      DOMParser parser = new DOMParser();
      parser.parse(new InputSource(in));
      Document doc = parser.getDocument();
      System.out.println("元素是：");
      printElements(doc);
      System.out.println();
      System.out.println("每个元素的属性是：");
      printElementAttributes(doc);
    }catch(SAXException s){
      System.out.println(s.toString());
    }catch(IOException e){
      System.out.println(e.toString());
    }
  }
  
  static void printElements(Document doc){
    NodeList nl = doc.getElementByTagName("*");
    Node n;
    for (int i=0;i<nl.getLength();i++){
      n = nl.item(i);
      System.out.print(n.getNodeName() + " ");
    }
  }
  
  static void printElementAttributes(Document doc){
    NodeList nl = doc.getElementsByTagName("*");
    Element e;
    Attr attr;
    NamedNodeMap nnm;
    String attrname;
    String attrval;
    int i,len;
    len = nl.getLength();
    for (int j=0;j<len;j++){
      e = (Element)nl.item(j);
      System.out.println(e.getTagName() + ":" + e.getFirstChild().getNodeValue());
      nnm = e.getAttributes();
      if (nnm != null){
        for (i=0;i<nnm.getLength();i++){
          attr = (Attr)nnm.item(i);
          attrname = attr.getName();
          attrval = attr.getValue();
          System.out.println("属性是：" + attrname + " = " + attrval);
        }
      }
    }
  }
}

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DOMSample.java:5: 软件包 org.apache.xerces.parsers 不存在
import org.apache.xerces.parsers.*;
^
DOMSample.java:15: 找不到符号
符号： 类 DOMParser
位置： 类 DOMSample
                        DOMParser parser = new DOMParser();
                        ^
DOMSample.java:15: 找不到符号
符号： 类 DOMParser
位置： 类 DOMSample
                        DOMParser parser = new DOMParser();
                                               ^
DOMSample.java:31: 找不到符号
符号： 方法 getElementByTagName(java.lang.String)
位置： 接口 org.w3c.dom.Document
                NodeList nl = doc.getElementByTagName("*");
                                 ^
4 错误