计算机科学论坛--Java&XML解析画表问题

1.XMLPainter.java文件
import java.awt.*;
import javax.swing.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import java.io.*;
import org.w3c.dom.*;

public class XMLPainter extends JTextArea
{
String parsedFile;
int WIDTH=80,HEIGTH=60;
int r,c;
static Document parsedDocument;
public void paintComponent(Graphics g)
{
  super.paintComponent(g);
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  try
  {
   /*解析器属性设置*/

   dbf.setValidating(true);//解析器解析XML文件时对其进行验证

   dbf.setIgnoringComments(true);//忽略注释

   dbf.setIgnoringElementContentWhitespace(true);//忽略空白

   dbf.setNamespaceAware(true);//使解析器理解命名空间

   dbf.setExpandEntityReferences(true);//展开实体引用节点

   /*解析器属性设置*/

   DocumentBuilder db=dbf.newDocumentBuilder();

   /*解析文件*/
   //System.out.println("XMLParser");
   parsedDocument = db.parse(new File("table.xml"));
   //System.out.println("XMLParserlast");
  }
  catch(SAXException se)
  {
   Exception e = se;
   if(se.getException()!=null)
   {
    e = se.getException();
    e.printStackTrace();
   }
  }
  catch(ParserConfigurationException pce)
  {
   pce.printStackTrace();
  }

  catch(IOException ie)
  {
   ie.printStackTrace();
  }
  catch(Exception e)
  {
   System.err.println(e.toString());
  }
  try
  {
   //System.out.println("paintComponentlast");
   Node root = parsedDocument.getDocumentElement();

   NodeList nodes = root.getChildNodes();
   for(r=1;r<=nodes.getLength();r++)
   {
    if(nodes.item(r-1).hasChildNodes())
    {
     NodeList childs = nodes.item(r-1).getChildNodes();
     for(c=1;c<=childs.getLength();c++)
     {
      int type = childs.item(c-1).getNodeType();
      if(type == Node.ELEMENT_NODE)
      {
       g.drawLine((c-1)*WIDTH,(r-1)*HEIGTH,(c-1)*WIDTH,r*HEIGTH);
       g.drawLine((c-1)*WIDTH,(r-1)*HEIGTH,c*WIDTH,(r-1)*HEIGTH);
       g.drawString(childs.item(c-1).getFirstChild().getNodeValue(),(c-1)*WIDTH,(r-1)*HEIGTH);
      }
     }
    }
   }
   g.drawLine(0,r*HEIGTH,c*WIDTH,r*HEIGTH);
   g.drawLine(c*WIDTH,0,c*WIDTH,r*HEIGTH);

  }
     catch(Exception e)
     {
      //System.err.println(e.toString());
     }

}
public void draw(String tableToDraw)
{
  parsedFile = tableToDraw;
  System.out.println("draw");
  //repaint();


}
}

2.UserGUI.java文件
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class UserGUI extends JApplet implements ActionListener
{
JButton printButton,previewButton,pagesetButton;
JPanel buttonPanel;
XMLPainter customPanel;
//ParsePainter testPanel;
Container container = getContentPane();
JScrollPane scroll;

public void init()
{//

  printButton = new JButton("打印");
  printButton.addActionListener(this);

  previewButton = new JButton("打印预览");
  previewButton.addActionListener(this);

  pagesetButton = new JButton("页面设置");
  pagesetButton.addActionListener(this);

  buttonPanel = new JPanel();
  buttonPanel.setBackground(Color.white);

  customPanel = new XMLPainter();
  customPanel.setBackground(Color.white);
  customPanel.draw("table.xml");

  scroll = new JScrollPane(customPanel);


  buttonPanel.add(printButton);
  buttonPanel.add(previewButton);
  buttonPanel.add(pagesetButton);

  container.add(buttonPanel,BorderLayout.SOUTH);
  container.add(scroll,BorderLayout.CENTER);

  //setSize(800,600);





}

public void actionPerformed(ActionEvent evt)
    {//
        Object src = evt.getSource();
        if (src == printButton)
            printAction();
        else if (src == previewButton)
            previewAction();
        else if (src == pagesetButton)
            pagesetAction();
    }

private void printAction()
{//
  JOptionPane.showConfirmDialog(null, "对不起!! 打印内容不能为空，打印已取消", "内容不能为空",JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE);
}

private void previewAction()
{
  JOptionPane.showMessageDialog(null,"完善中","完善中",JOptionPane.CLOSED_OPTION);

  //printButton.setLabel(pagesetButton.getLabel());
}
private void pagesetAction()
{
  //JOptionPane.showMessageDialog(null,"完善中","完善中",JOptionPane.CLOSED_OPTION);
  //pagesetButton.setLabel(previewButton.getLabel());
}

}

程序一到解析就不能运行了捕捉异常抛出个accesscontrolexception异常请高手指点

[此贴子已经被作者于2005-6-4 14:17:26编辑过]


	W 3 C h i n a ( since 2003 ) 旗下站点苏ICP备05006046号《全国人大常委会关于维护互联网安全的决定》《计算机信息网络国际联网安全保护管理办法》	46.875ms