domtree.09

java操作xml文件的各种代码

import java.awt.*;
import javax.swing.*;
import javax.swing.tree.TreePath;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeCellRenderer;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.ProcessingInstruction;
//加载xerces的DOM分析器
import org.apache.xerces.parsers.DOMParser;

/**
 * <CODE>DOMTreeView</CODE>会读入一个XML文件，
 * 使用DOM分析器分析后，将它显示到一个Java的JTree里。
 *
 * @author <a href="mailto:[e-mail]">王景浩</a>
 * @version 0.9
 */
public class DOMTreeView extends JFrame{
  public JTree tree;
  /**
   * 设置窗口的初始值
   */
  public void display(){
    try {
      //将tree加到窗口里，同时设置在窗口的中间。
      this.getContentPane().add(tree, BorderLayout.CENTER);
      //设置窗口大小
      this.setSize(new Dimension(400, 300));
      //显示窗口
      this.show();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**
   *   设置窗口关闭的事件
   */
  protected void processWindowEvent(java.awt.event.WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == java.awt.event.WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
  public void parse(String uri){
    //建立一个 DOM 分析器
    DOMParser parser = new DOMParser();
    try{
      //显示标题
      this.setTitle("目前文件: " + uri);
      parser.setFeature(
        "http://xml.org/sax/features/validation",
        true);
      parser.setFeature(
        "http://apache.org/xml/features/dom/include-ignorable-whitespace",
        false);
      parser.parse(uri);
      Document doc = parser.getDocument();
      //建立使用MyTreeModel的tree
      tree = new JTree(new MyTreeModel(doc));
      //将tree的CellRenderer设置为MyTreeCellRenderer
      tree.setCellRenderer(new MyTreeCellRenderer());
    } catch (Exception e){
      System.err.println("分析错误: " + e.getMessage());
    }
  }
  public static void main(String[] args) {
    if( args.length != 1) {
      System.out.println("使用方法: java DOMTreeView [XML文件名称]");
      return;
    }
    String uri = args[0];
    DOMTreeView dtv = new DOMTreeView();
    dtv.parse(uri);
    dtv.display();
  }
}

class MyTreeModel implements TreeModel {
  private Document root;

  public MyTreeModel(Document doc){
    root = doc;
  }
  public Object getRoot() {
    return root;
  }
  public Object getChild(Object parent, int index) {
    return ((Node)parent).getChildNodes().item(index);
  }
  public int getChildCount(Object parent) {
    return ((Node)parent).getChildNodes().getLength();
  }
  public boolean isLeaf(Object node) {
    return ((Node)node).getChildNodes().getLength() == 0;
  }
  public void valueForPathChanged(TreePath path, Object newValue) {  }
  public int getIndexOfChild(Object parent, Object child) {
    NodeList nl = ((Node)parent).getChildNodes();
    for(int i=0; i< nl.getLength(); i++)
      if( ((Node)child).equals(nl.item(i)) )
        return i;
    return -1;
  }
  public void addTreeModelListener(TreeModelListener l) {  }
  public void removeTreeModelListener(TreeModelListener l) {  }
}

class MyTreeCellRenderer extends JLabel implements TreeCellRenderer{
  public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
    Node node = (Node)value;
    switch( node.getNodeType() ){
      case Node.CDATA_SECTION_NODE:
      case Node.COMMENT_NODE:
      case Node.TEXT_NODE:
        this.setText( node.getNodeName() + " \"" +
                      node.getNodeValue() + "\"  " );
        break;
      case Node.ELEMENT_NODE:
        NamedNodeMap nodeMap = node.getAttributes();
        StringBuffer strElement = new StringBuffer();
        strElement.append( "<" + node.getNodeName() );
        for(int i=0; i< nodeMap.getLength(); i++)
          strElement.append(" " + nodeMap.item(i).getNodeName() +
                            "=\"" + nodeMap.item(i).getNodeValue() + "\"");
        this.setText(strElement.toString());
        break;
      case Node.DOCUMENT_NODE:
        this.setText( node.getNodeName() );
        break;
      case Node.DOCUMENT_TYPE_NODE:
        DocumentType dt = (DocumentType)node;
        this.setText( dt.getName() + " " +
                      "System ID: " + dt.getSystemId() + ", " +
                      "Public ID: " + dt.getPublicId() + "  "
                      );
        break;
      case Node.PROCESSING_INSTRUCTION_NODE:
        ProcessingInstruction pi = (ProcessingInstruction)node;
        this.setText( "Target=(" + pi.getTarget() + "), " +
                      "Data=(" + pi.getData() + ")"
        );
        break;
      case Node.ENTITY_REFERENCE_NODE:
        this.setText( "&" + node.getNodeName() + ";");
        break;
      default:
        this.setText( node.getNodeType() + " <" +
                      node.getNodeName() + "> \"" +
                      node.getNodeValue() + "\"  " );
    }
    return this;
  }
}