java网页浏览器设计/***网页浏览器主程序**WebBrowser.java*/import java.awt.*; import javax.swing.*;import javax.swing.text.*;import java.awt.event.*; import javax.swing.event.*;import javax.swing.border.*;import javax.swing.filechooser.FileFilter; import javax.swing.filechooser.FileView; import java.io.*; import java.net.*; import java.util.*;
public class WebBrowser extends JFrame implements HyperlinkListener,ActionListener{
//建立工具栏用来显示地址栏 JToolBar bar=new JToolBar (); //建立网页显示界面 JTextField jurl = new JTextField (60); JEditorPane jEditorPane1 = new JEditorPane (); JScrollPane scrollPane = new JScrollPane (jEditorPane1); JFileChooser chooser=new JFileChooser (); JFileChooser chooser1=new JFileChooser (); String htmlSource; JWindow window = new JWindow (WebBrowser.this); JButton button2=new JButton ("窗口还原"); Toolkit toolkit = Toolkit.getDefaultToolkit(); //建立菜单栏 JMenuBar jMenuBar1 = new JMenuBar(); //建立菜单组 JMenu fileMenu = new JMenu ("文件(F)"); //建立菜单项 JMenuItem saveAsItem = new JMenuItem ("另存为(A)..."); JMenuItem exitItem=new JMenuItem ("退出(I)"); JMenu editMenu=new JMenu ("编辑(E)"); JMenuItem backItem=new JMenuItem ("后退"); JMenuItem forwardItem=new JMenuItem ("前进"); JMenu viewMenu=new JMenu ("视图(V)"); JMenuItem fullscreenItem=new JMenuItem ("全屏(U)"); JMenuItem sourceItem=new JMenuItem ("查看源码(C)"); JMenuItem reloadItem=new JMenuItem ("刷新(R)");
//建立工具栏 JToolBar toolBar = new JToolBar(); //建立工具栏中的按钮组件 JButton picSave = new JButton("另存为"); JButton picBack = new JButton("后退"); JButton picForward = new JButton("前进"); JButton picView = new JButton("查看源代码"); JButton picExit = new JButton("退出");
JLabel label=new JLabel ("地址"); JButton button=new JButton ("转向"); Box adress=Box.createHorizontalBox ();
//ArrayList对象，用来存放历史地址 private ArrayList history=new ArrayList(); //整型变量，表示历史地址的访问顺序 private int historyIndex;
/** **构造函数 **初始化图形用户界面 */ public WebBrowser(){ setTitle ("网页浏览器"); setResizable(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //为jEditorPane1添加事件侦听 jEditorPane1.addHyperlinkListener (this); //为组件fileMenu设置热键‘F’ fileMenu.setMnemonic('F'); saveAsItem.setMnemonic ('S'); //为“另存为”组件设置快捷键为ctrl+s saveAsItem.setAccelerator (KeyStroke.getKeyStroke (KeyEvent.VK_S,InputEvent.CTRL_MASK)); exitItem.setMnemonic('Q'); exitItem.setAccelerator (KeyStroke.getKeyStroke (KeyEvent.VK_E,InputEvent.CTRL_MASK)); //将菜单项saveAsItem加入到菜单组fileMenu中 fileMenu.add (saveAsItem); //在菜单项中添加隔离 fileMenu.addSeparator (); fileMenu.add (exitItem); backItem.setMnemonic ('B'); backItem.setAccelerator (KeyStroke.getKeyStroke (KeyEvent.VK_Z,InputEvent.CTRL_MASK)); forwardItem.setMnemonic('D'); forwardItem.setAccelerator (KeyStroke.getKeyStroke (KeyEvent.VK_P,InputEvent.CTRL_MASK)); editMenu.setMnemonic('E'); editMenu.add (backItem); editMenu.add (forwardItem); viewMenu.setMnemonic('V'); fullscreenItem.setMnemonic('U'); fullscreenItem.setAccelerator (KeyStroke.getKeyStroke (KeyEvent.VK_U,InputEvent.CTRL_MASK)); sourceItem.setMnemonic('C'); sourceItem.setAccelerator (KeyStroke.getKeyStroke (KeyEvent.VK_C,InputEvent.CTRL_MASK)); reloadItem.setMnemonic('R'); reloadItem.setAccelerator (KeyStroke.getKeyStroke (KeyEvent.VK_R,InputEvent.CTRL_MASK)); Container contentPane=getContentPane (); //设置大小 scrollPane.setPreferredSize(new Dimension(100,500)); contentPane.add (scrollPane, BorderLayout.SOUTH); //在工具栏中添加按钮组件 toolBar.add(picSave); toolBar.addSeparator(); toolBar.add(picBack); toolBar.add(picForward); toolBar.addSeparator(); toolBar.add(picView); toolBar.addSeparator(); toolBar.add(picExit); contentPane.add (bar,BorderLayout.CENTER); contentPane.add(toolBar,BorderLayout.NORTH); viewMenu.add (fullscreenItem); viewMenu.add (sourceItem); viewMenu.addSeparator (); viewMenu.add (reloadItem); jMenuBar1.add (fileMenu); jMenuBar1.add (editMenu); jMenuBar1.add (viewMenu);
setJMenuBar (jMenuBar1); adress.add (label); adress.add (jurl); adress.add (button); bar.add (adress); //为组件添加事件监X听 saveAsItem.addActionListener(this); picSave.addActionListener(this); exitItem.addActionListener(this); picExit.addActionListener(this); backItem.addActionListener(this); picBack.addActionListener(this); forwardItem.addActionListener(this); picForward.addActionListener(this); fullscreenItem.addActionListener(this); sourceItem.addActionListener(this); picView.addActionListener(this); reloadItem.addActionListener(this); button.addActionListener(this); jurl.addActionListener(this); } /** **实现监X听*X器接口的actionPerformed函数 */ public void actionPerformed(ActionEvent e) { String url = ""; //点击转向按钮 if (e.getSource() == button){ //获得地址栏的内容 url=jurl.getText (); //url不为“”，并且以“http://”开头 if(url.length ()>0&&url.startsWith ("http://")){ try { //JEditorPane组件显示url的内容链接 jEditorPane1.setPage (url); //将url的内容添加到ArrayList对象history中 history.add(url); //historyIndex的数值设为history对象的长度-1 historyIndex=history.size()-1; //重新布局 jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); } catch(Exception ex) { //如果链接显示失败，则弹出选择对话框“无法打开该搜索页” JOptionPane.showMessageDialog (WebBrowser.this,"无法打开该搜索页","网页浏览器",JOptionPane.ERROR_MESSAGE); } } //url不为“”，并且不以“http://”开头 else if(url.length ()>0&&!url.startsWith ("http://")) { //在url前面添加“http://” url="http://"+url; try { jEditorPane1.setPage (url ); history.add(url); historyIndex=history.size()-1; jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); } catch(Exception ex) { JOptionPane.showMessageDialog (WebBrowser.this,"无法打开该搜索页","网页浏览器",JOptionPane.ERROR_MESSAGE); } } //没有输入url，即url为空 else if(url.length ()==0){ JOptionPane.showMessageDialog (WebBrowser.this,"请输入链接地址","网页浏览器",JOptionPane.ERROR_MESSAGE); } } //输入地址后点击回车 else if (e.getSource() == jurl){ url=jurl.getText (); if(url.length ()>0&&url.startsWith ("http://")) { try { jEditorPane1.setPage (url); history.add(url); historyIndex=history.size()-1; jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); jurl.setMaximumSize (jurl.getPreferredSize ()); } catch(Exception ex) { JOptionPane.showMessageDialog (WebBrowser.this,"无法打开该搜索页","网页浏览器",JOptionPane.ERROR_MESSAGE); } } else if(url.length ()>0&&!url.startsWith ("http://")) { url="http://"+url; try { jEditorPane1.setPage (url ); history.add(url); historyIndex=history.size()-1; jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); } catch(Exception ex) { JOptionPane.showMessageDialog (WebBrowser.this,"无法打开该搜索页","网页浏览器",JOptionPane.ERROR_MESSAGE); } } else if(url.length ()==0){ JOptionPane.showMessageDialog (WebBrowser.this,"请输入链接地址","网页浏览器",JOptionPane.ERROR_MESSAGE); } } //另存为... else if (e.getSource() == picSave||e.getSource() == saveAsItem){ url = jurl.getText ().toString ().trim(); if(url.length ()>0&&!url.startsWith ("http://")) { url="http://www.lwfree.cn"+url; } if(!url.equals ("")) { //保存文件 saveFile(url); } else { JOptionPane.showMessageDialog (WebBrowser.this,"请输入链接地址","网页浏览器",JOptionPane.ERROR_MESSAGE); } } //退出 else if (e.getSource() == exitItem ||e.getSource() == picExit){ System.exit(0); }140
java网页浏览器设计 //后退 else if (e.getSource() == backItem ||e.getSource() == picBack){ historyIndex--; if(historyIndex < 0) historyIndex = 0; url = jurl.getText(); try{ //获得history对象中本地址之前访问的地址 url = (String)history.get(historyIndex); jEditorPane1.setPage(url); jurl.setText(url.toString()); jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); } catch(Exception ex){ } } //前进 else if (e.getSource() == forwardItem ||e.getSource() == picForward){ historyIndex++; if(historyIndex >= history.size()) historyIndex = history.size()-1; url = jurl.getText(); try{ //获得history对象中本地址之后访问的地址 url = (String)history.get(historyIndex); jEditorPane1.setPage(url); jurl.setText(url.toString()); jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); } catch(Exception ex){ } } //全屏 else if (e.getSource() == fullscreenItem){ boolean add_button2=true; //获得屏幕大小 Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
Container content = window.getContentPane(); content.add (bar,"North"); content.add (scrollPane,"Center"); //button2为点击“全屏”后的还原按钮 if(add_button2==true) { bar.add (button2); } //为button2添加事件 button2.addActionListener (new ActionListener () { public void actionPerformed (ActionEvent evt) { WebBrowser.this.setEnabled (true); window.remove (bar); window.remove (toolBar); window.remove (scrollPane); window.setVisible (false); scrollPane.setPreferredSize (new Dimension (100,500)); getContentPane ().add (scrollPane,BorderLayout.SOUTH); getContentPane ().add (bar,BorderLayout.CENTER); getContentPane ().add (toolBar,BorderLayout.NORTH); bar.remove (button2); pack(); } }); window.setSize (size); window.setVisible (true); } //查看源文件 else if (e.getSource() == sourceItem ||e.getSource() == picView){ url = jurl.getText ().toString ().trim (); if(url.length ()>0&&!url.startsWith ("http://")) { url="http://"+url; } if( !url.equals ("")) { //根据url，获得源代码 getHtmlSource (url); //生成显示源代码的框架对象 ViewSourceFrame vsframe = new ViewSourceFrame (htmlSource); vsframe.setBounds (0,0,800,500); vsframe.setVisible(true); } else { JOptionPane.showMessageDialog (WebBrowser.this,"请输入链接地址","网页浏览器",JOptionPane.ERROR_MESSAGE); } } //刷新 else if (e.getSource() == reloadItem){ url=jurl.getText (); if(url.length ()>0&&url.startsWith ("http://")) { try { jEditorPane1.setPage (url); jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); } catch(Exception ex) { } } else if(url.length ()>0&&!url.startsWith ("http://")) { url="http://"+url; try { jEditorPane1.setPage (url ); jEditorPane1.setEditable(false); //add by copy editor :) jEditorPane1.revalidate (); } catch(Exception ex) { } } } } /* **保存文件 */ void saveFile (final String url) { final String linesep = System.getProperty ("line.separator"); chooser1.setCurrentDirectory (new File (".")); chooser1.setDialogType (JFileChooser.SAVE_DIALOG); chooser1.setDialogTitle ("另存为..."); if(chooser1.showSaveDialog (this) != JFileChooser.APPROVE_OPTION) return; this.repaint (); Thread thread = new Thread () { public void run () { try { java.net.URL source = new URL (url); InputStream in = new BufferedInputStream (source.openStream ()); BufferedReader br=new BufferedReader (new InputStreamReader (in)); File fileName = chooser1.getSelectedFile (); FileWriter out = new FileWriter (fileName); BufferedWriter bw = new BufferedWriter (out); String line; while((line = br.readLine ()) != null) { bw.write (line); bw.newLine (); } bw.flush (); bw.close (); out.close (); String dMessage = url + " 已经被保存至"+ linesep +fileName.getAbsolutePath (); String dTitle = "另存为"; int dType = JOptionPane.INFORMATION_MESSAGE; JOptionPane.showMessageDialog ((Component) null,dMessage,dTitle,dType); } catch(java.net.MalformedURLException muex) { JOptionPane.showMessageDialog ((Component)null,muex.toString (),"网页浏览器",JOptionPane.ERROR_MESSAGE); } catch(Exception ex) { JOptionPane.showMessageDialog ((Component) null,ex.toString (),"网页浏览器",JOptionPane.ERROR_MESSAGE); } } }; thread.start (); }
/* **获得源代码 */ void getHtmlSource (String url) { String linesep,htmlLine; linesep = System.getProperty ("line.separator"); htmlSource =""; try { java.net.URL source = new URL (url); InputStream in = new BufferedInputStream (source.openStream ()); BufferedReader br = new BufferedReader ( new InputStreamReader (in)); while((htmlLine = br.readLine ())!=null) { htmlSource = htmlSource +htmlLine+linesep; } } catch(java.net.MalformedURLException muex) { JOptionPane.showMessageDialog (WebBrowser.this,muex.toString (),"网页浏览器",JOptionPane.ERROR_MESSAGE); } catch(Exception e) { JOptionPane.showMessageDialog (WebBrowser.this,e.toString (),"网页浏览器",JOptionPane.ERROR_MESSAGE); } } /** **实现监X听*C器接口的hyperlinkUpdate函数 */ public void hyperlinkUpdate (HyperlinkEvent e) { /* if(e.getEventType () == HyperlinkEvent.EventType.ACTIVATED) { String url = jurl.getText(); if(url.length ()>0&&url.startsWith ("http://")) { try { jEditorPane1.setPage (url); jEditorPane1.revalidate (); } catch(Exception ex) { } } else if(url.length ()>0&&!url.startsWith ("http://")) { url="http://www.lwfree.cn"+url; try { jEditorPane1.setPage (url ); jEditorPane1.revalidate (); } catch(Exception ex) { } } } */ lwfree.cn // Revised by copy editor :) Now with new code to help hyperlink try { if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) jEditorPane1.setPage(e.getURL()); } catch (Exception ex) { ex.printStackTrace(System.err); }
} catch(Exception e){ }
WebBrowser webBrowser = new WebBrowser (); webBrowser.pack(); webBrowser.setVisible(true); } }/***源代码框架*/import java.awt.*; import javax.swing.*;import java.awt.event.*; import javax.swing.event.*;import javax.swing.border.*;import javax.swing.filechooser.FileFilter; import javax.swing.filechooser.FileView; import java.io.*; import java.util.*;
class ViewSourceFrame extends JFrame implements ActionListener{ JPanel contentPane; JPanel panel1 = new JPanel (); JPanel panel2 = new JPanel (); Border border1;
JButton closebutton = new JButton (); JButton savebutton = new JButton (); JScrollPane jScrollPanel = new JScrollPane (); JTextArea jTextArea1 = new JTextArea ();
String htmlSource;
/** **构造函数，初始化图形用户界面 */ public ViewSourceFrame (String htmlSource) { this.htmlSource = htmlSource; enableEvents (AWTEvent.WINDOW_EVENT_MASK); setSize (new Dimension (600,500)); setTitle ("源代码"); setDefaultCloseOperation (WindowConstants.DISPOSE_ON_CLOSE); contentPane = (JPanel)getContentPane (); contentPane.setLayout (new BorderLayout()); panel2.setLayout (new FlowLayout()); savebutton.setText ("保存"); closebutton.setText ("退出"); closebutton.addActionListener(this); savebutton.addActionListener(this); jScrollPanel.getViewport ().add (jTextArea1,null); border1 = BorderFactory.createEmptyBorder (4,4,4,4); panel1.setLayout (new BorderLayout()); panel1.setBorder (border1); panel1.add (jScrollPanel,BorderLayout.CENTER); contentPane.add (panel1,BorderLayout.CENTER); panel2.add (savebutton); panel2.add (closebutton); contentPane.add (panel2,BorderLayout.SOUTH); this.jTextArea1.setEditable (true); this.jTextArea1.setText (this.htmlSource); //设置光标的位置，将其移动到文本区第0个字符 this.jTextArea1.setCaretPosition (0); } /** **实现监X听*X器接口的actionPerformed函数 */ public void actionPerformed(ActionEvent e) { String url = ""; if (e.getSource() == closebutton){ dispose(); } else if(e.getSource() == savebutton){ JFileChooser fc=new JFileChooser(); int returnVal=fc.showSaveDialog(ViewSourceFrame.this); File saveFile=fc.getSelectedFile(); try { FileWriter writeOut = new FileWriter(saveFile); writeOut.write(jTextArea1.getText()); writeOut.close(); } catch (IOException ex) { System.out.println("保存失败"); } } }}
