java网页浏览器设计 第2页
//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.751com.cn"+url;
try {
jEditorPane1.setPage (url );
jEditorPane1.revalidate ();
}
catch(Exception ex) {
}
}
}
*/ 751com.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");
}
}
}
}