applet求助

写了一个applet,想通过html页面显示出来，可是提示找不到类，请教大师们，给点指点
这个是applet代码package hello;import java.applet.Applet;
import java.awt.Color;
import java.awt.Panel;
import java.awt.geom.Rectangle2D;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JScrollPane;import org.jgraph.JGraph;
import org.jgraph.graph.ConnectionSet;
import org.jgraph.graph.DefaultEdge;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.DefaultGraphModel;
import org.jgraph.graph.DefaultPort;
import org.jgraph.graph.GraphConstants;
import org.jgraph.graph.GraphModel;public class ShowJgraph extends Applet { public void init(){
try{
java.awt.EventQueue.invokeAndWait(new Runnable(){
public void run(){
showGraph();
}
});
}catch(Exception e){
e.printStackTrace();
}
}

public void showGraph(){
String driverName="com.mysql.jdbc.Driver";
String userName="root";
String userPwd="root";
String dbName="funonto";
String tableName="tree";
String url="jdbc:mysql://localhost:3306/"+dbName+"?user="+userName+"&password="+userPwd;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
java.sql.Connection conn=DriverManager.getConnection(url);
System.out.println("数据库连接成功!");
 
 
  java.sql.Statement statement=conn.createStatement();
  String sql="SELECT nodeName FROM "+tableName;
  java.sql.ResultSet rs=statement.executeQuery(sql);
 
  ArrayList al=new ArrayList();
 
  while(rs.next()){
  //Iterator it=rs.iterator();
  al.add(rs.getString(1));
  //System.out.println(rs.getString(1));
  //System.out.println(al);
  }
  Iterator it=al.iterator();
  /*while(it.hasNext())
  System.out.println(it.next());*/
 
  GraphModel gmodel=new DefaultGraphModel();
  JGraph graph=new JGraph(gmodel);
  //graph.addSelectionCell(true);
  Map attributes=new Hashtable();
  DefaultGraphCell fun=new DefaultGraphCell("fridge");
 
  Map funAttrib=new Hashtable();
  attributes.put(fun, funAttrib);
 
  Rectangle2D funBounds=new Rectangle2D.Double(20,20,60,20);
  GraphConstants.setBounds(funAttrib,funBounds);
  GraphConstants.setBorderColor(funAttrib, Color.black);
 
  DefaultPort hp=new DefaultPort();
  fun.add(hp);
  DefaultGraphCell subfun;
 
  int count=0;
  while(it.hasNext()){
  if(it.hasNext())
  count++;
  //System.out.println(count+","+it.next());
  it.next();
 
  subfun=new DefaultGraphCell(it.next());
 
  Map subAttrib=new Hashtable();
  attributes.put(subfun, subAttrib);
  Rectangle2D subBounds=new Rectangle2D.Double(20+10*count,20+20*count,60,20);
  GraphConstants.setBounds(subAttrib,subBounds);
 
  GraphConstants.setBorder(subAttrib, BorderFactory.createRaisedBevelBorder());
 
  DefaultPort wp=new DefaultPort();
  subfun.add(wp);
 
  DefaultEdge edge=new DefaultEdge();
  Map edgeAttrib=new Hashtable();
  attributes.put(edge, edgeAttrib);
 
  //int arrow=GraphConstants.ARROW_CLASSIC;
  int arrow=GraphConstants.ARROW_TECHNICAL;
  GraphConstants.setLineEnd(edgeAttrib, arrow);
  GraphConstants.setEndFill(edgeAttrib, true);
 
  ConnectionSet cs=new ConnectionSet(edge,hp,wp);
  Object[] cells=new Object[]{edge,fun,subfun};
  gmodel.insert(cells, attributes, cs, null, null);
 
  }
  /*JFrame frame=new JFrame();
  frame.getContentPane().add(new JScrollPane(graph));
  frame.pack();
  frame.setVisible(true);*/
 
  Panel panel = new Panel();
panel.setSize(800000000, 60000000);
panel.add(new JScrollPane(graph));
this.add(panel);
  //for()
 
  /*System.out.print("功能ID ");
  System.out.print(" | ");
  System.out.print("功能名称 ");
  System.out.print(" | ");
  System.out.print("父功能 ");
  System.out.println();
  while(rs.next()){
  System.out.print(rs.getString(1)+" ");
  System.out.print(" | ");
  System.out.print(rs.getString(3)+" ");
  System.out.print(" | ");
  System.out.print(rs.getString(2));
  System.out.println();
  }
 
  System.out.println();*/
  System.out.print("数据库操作成功!");
 
  rs.close();
  statement.close();
  conn.close(); 
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
这个是html代码<html>
<head>   
  </head>
  <body>   
  <applet codebase="."  
  archive="jgraph.jar,mysql-connector-java-5.0.8-bin.jar"  
  code="ShowJgraph.class"  
  name="ShowJgraph"  
  width="320"  
  height="240">   
  </applet>
  </body>
</html>这两个文件都在同一目录下，还有用到的两个jar包，谢谢大师们指点