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.youerw.com"+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