webreader.java

简单IE浏览器, 简单IE浏览器, 简单IE浏览器,

//     WebReader.java   
  //   This   program   uses   a   JEditorPane   to   display   the   
  //   contents   of   a   file   on   a   Web   server.   
    
  //   Java   core   packages   
  import   java.awt.*;   
  import   java.awt.event.*;   
  import   java.net.*;   
  import   java.io.*;   
  import   java.util.*;   
    
  //   Java   extension   packages   
  import   javax.swing.*;   
  import   javax.swing.event.*;   
    
  public   class   WebReader   extends   JFrame   {   
  private   JTextField   enterField;   
  private   JEditorPane   contentsArea;   
  private   JButton   backButton,fwdButton;   
  private   JPanel   contralPanel;   
  private   URLList   urllist;   
        //   set   up   GUI   
        public   WebReader()   
        {   
              super(   "My   Web   Browser"   );   
    
    
              JMenu   fileMenu   =   new   JMenu("File");//set   up   File   menu   ane   its   menu   item   
              fileMenu.setMnemonic('F');   
    
              JMenuItem   exitItem   =   new   JMenuItem("Exit");   
              exitItem.setMnemonic('X');   
              exitItem.addActionListener(   
              new   ActionListener(){   
              public   void   actionPerformed(ActionEvent   event){   
              System.exit(0);   
              }   
              }   
              );   
              fileMenu.add(   exitItem   );   
    
              JMenuBar   bar   =   new   JMenuBar();   
              setJMenuBar(   bar   );   
              bar.add(   fileMenu   );   
    
              JMenu   editMenu   =   new   JMenu("Edit");   
              editMenu.setMnemonic('E');   
    
              JMenuItem   nextItem   =   new   JMenuItem(   "Next"   );   
              nextItem.setMnemonic(   'N'   );   
              nextItem.addActionListener(   
              new   ActionListener(){   
              public   void   actionPerformed(ActionEvent   event){   
              System.exit(0);   
              }   
              }   
              );   
              editMenu.add(   nextItem   );   
              bar.add(   editMenu   );   
    
              Container   container   =   getContentPane();   
    
              FlowLayout   lay=new   FlowLayout();   
              lay.setAlignment(   FlowLayout.LEFT   );   
    
              contralPanel   =   new   JPanel();   
              contralPanel.setLayout(   lay   );   
    
              urllist   =   new   URLList();   
    
              Icon   back   =   new   ImageIcon(   "back.gif"   );   
              backButton   =   new   JButton(   "back",back   );   
              backButton.addActionListener(   
              new   ActionListener()   
              {   
              public   void   actionPerformed(   ActionEvent   event   )   
                          {   
                          String   strback=new   String(   urllist.back()   );   
                          System.out.println(   strback   );   
                          if(   !strback.equals(   "Noop"   )   )   
                          getThePage(   strback   );   
                            
                          }   
                  }   
              );   
      contralPanel.add(   backButton   );   
    
              Icon   fwd   =   new   ImageIcon(   "fwd.gif"   );   
              fwdButton   =   new   JButton(   "fwd",fwd   );   
              fwdButton.addActionListener(   
              new   ActionListener()   
              {   
              public   void   actionPerformed(   ActionEvent   event   )   
                          {   
                          String   strfwd=new   String(   urllist.forward()   );   
                          System.out.println(   strfwd   );   
                          if(   !strfwd.equals(   "Noop"   )   )   
                          getThePage(   strfwd   );   
                            
                          }   
                  }   
              );   
              contralPanel.add(   fwdButton   );   
    
              //   create   enterField   and   register   its   listener   
              enterField   =   new   JTextField(   "Enter   file   URL   here",24   );   
    
              enterField.addActionListener(   
    
                    new   ActionListener()   {   
    
                          //   get   document   specified   by   user   
                          public   void   actionPerformed(   ActionEvent   event   )   
                          {   
                          urllist.push(   event.getActionCommand()   );   
                          getThePage(   event.getActionCommand()   );   
                          }   
    
                    }     //   end   anonymous   inner   class   
    
              );   //   end   call   to   addActionListener   
    
              enterField.addMouseListener(   
              new   MouseListener(){   
              public   void   mouseClicked(   MouseEvent   e   )   
              {   
              enterField.selectAll();   
              }   
    
              public   void   mousePressed(   MouseEvent   e   )   
              {   
              }   
    
              public   void   mouseReleased(   MouseEvent   e   )   
              {   
              }   
              public   void   mouseEntered(   MouseEvent   e   )   
              {   
              }   
                
                
              public   void   mouseExited(   MouseEvent   e   )   
              {   
              }   
              }   
              );   
    
              contralPanel.add(   enterField   );   
    
              container.add(   contralPanel,   BorderLayout.NORTH   );   
              //   create   contentsArea   and   register   HyperlinkEvent   listener   
              contentsArea   =   new   JEditorPane();   
              contentsArea.setEditable(   false   );   
    
              contentsArea.addHyperlinkListener(   
    
                    new   HyperlinkListener()   {   
    
                          //   if   user   clicked   hyperlink,   go   to   specified   page   
                          public   void   hyperlinkUpdate(   HyperlinkEvent   event   )   
                          {   
                                if   (   event.getEventType()   ==   
                                          HyperlinkEvent.EventType.ACTIVATED   )   
                                          {   
                                          urllist.push(   event.getURL().toString()   );   
                                          getThePage(   event.getURL().toString()   );   
                                          }   
                          }   
    
                    }     //   end   anonymous   inner   class   
    
              );   //   end   call   to   addHyperlinkListener   
    
              container.add(     new   JScrollPane(   contentsArea   )   ,   
                    BorderLayout.CENTER   );   
    
              setSize(   1000,   700   );   
              setVisible(   true   );   
        }   
    
        //   load   document;   change   mouse   cursor   to   indicate   status   
        private   void   getThePage(   String   location   )   
        {   
              //   change   mouse   cursor   to   WAIT_CURSOR   
              setCursor(   Cursor.getPredefinedCursor(   
                    Cursor.WAIT_CURSOR   )   );   
    
              if(!location.startsWith(   "http://"   ))   
              location="http://"   +   location;   
    
              //   load   document   into   contentsArea   and   display   location   in   
              //   enterField   
              try   {   
                    contentsArea.setPage(   location   );   
                    enterField.setText(   location   );   
              }   
    
              //   process   problems   loading   document   
              catch   (   IOException   ioException   )   {   
                    JOptionPane.showMessageDialog(   this,   
                          "Error   retrieving   specified   URL",   
                          "Bad   URL",   JOptionPane.ERROR_MESSAGE   );   
              }   
    
              setCursor(   Cursor.getPredefinedCursor(   
                    Cursor.DEFAULT_CURSOR   )   );   
        }   
    
        //   begin   application   execution   
        public   static   void   main(   String   args[]   )   
        {   
              WebReader   application   =   new   WebReader();   
    
              application.setDefaultCloseOperation(   
                    JFrame.EXIT_ON_CLOSE   );   
    
        }   
    
  }     //   end   class   WebReader   
  class   URLList   
  {   
  private   int   now   =   0;   
  private   Vector   vector;   
    
  URLList()   
  {   
  vector   =   new   Vector(   1   );   
  }   
  public   void   push(String   url)   
  {   
  vector.add(url);   
  now   =   vector.size()-1;   
  }   
    
  public   String   back()   
  {   
  System.out.println(   "back     "   +   now   );   
  if(   now   ==   0   )   
  return(   "Noop"   );   
  else   
  {   
  now--;   
  System.out.println(   "back----"   +   now   );   
  return(   (String)vector.get(   now   ));   
  }   
  }   
    
  public   String   forward()   
  {   
  System.out.println(   "fwd"   +   now   +   vector.size()   );   
  if(   (   vector.size()   ==   0   )   ||   (   now   ==   (   vector.size()-1   )   )   )   
  return(   "Noop"   );   
  else   
  {   
  now++;   
  System.out.println(   "fwd+++"   +   now   );   
  return(   (String)vector.get(   now   ));   
  }   
  }   
  public   int   getnow()   
  {   
  return   now;   
  }   
  }