DOS下編譯可能會出問題，可以用命令 [ javac -Xlint:unchecked?WebReader.java?]，
如果不想出錯請用eclipse進行編譯。至于什么原因，下個文章解釋；
對瀏覽器感興趣的朋友，這是firefox各個版本的程序和源代碼下載FTP地址
ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/?
代碼：
??1
??2//?????WebReader.java???
??3??//???This???program???uses???a???JEditorPane???to???display???the???
??4??//???contents???of???a???file???on???a???Web???server.???
??5????
??6??//???Java???core???packages???
??7??import???java.awt.*;???
??8??import???java.awt.event.*;???
??9??import???java.net.*;???
?10??import???java.io.*;???
?11??import???java.util.*;???
?12????
?13??//???Java???extension???packages???
?14??import???javax.swing.*;???
?15??import???javax.swing.event.*;???
?16????
?17
??public???class???WebReader???extends???JFrame???
{???
?18
??private???JTextField???enterField;???
?19??private???JEditorPane???contentsArea;???
?20??private???JButton???backButton,fwdButton;???
?21??private???JPanel???contralPanel;???
?22??private???URLList???urllist;???
?23????????//???set???up???GUI???
?24????????public???WebReader()???
?25
????????{???
?26??????????????super(???"My???Web???Browser"???);???
?27????
?28????
?29??????????????JMenu???fileMenu???=???new???JMenu("File");//set???up???File???menu???ane???its???menu???item???
?30??????????????fileMenu.setMnemonic('F');???
?31????
?32??????????????JMenuItem???exitItem???=???new???JMenuItem("Exit");???
?33??????????????exitItem.setMnemonic('X');???
?34??????????????exitItem.addActionListener(???
?35??????????????new???ActionListener(){???
?36??????????????public???void???actionPerformed(ActionEvent???event){???
?37??????????????System.exit(0);???
?38
??????????????}???
?39??????????????}???
?40??????????????);???
?41??????????????fileMenu.add(???exitItem???);???
?42????
?43??????????????JMenuBar???bar???=???new???JMenuBar();???
?44??????????????setJMenuBar(???bar???);???
?45??????????????bar.add(???fileMenu???);???
?46????
?47??????????????JMenu???editMenu???=???new???JMenu("Edit");???
?48??????????????editMenu.setMnemonic('E');???
?49????
?50??????????????JMenuItem???nextItem???=???new???JMenuItem(???"Next"???);???
?51??????????????nextItem.setMnemonic(???'N'???);???
?52??????????????nextItem.addActionListener(???
?53??????????????new???ActionListener(){???
?54??????????????public???void???actionPerformed(ActionEvent???event){???
?55??????????????System.exit(0);???
?56??????????????}???
?57??????????????}???
?58??????????????);???
?59??????????????editMenu.add(???nextItem???);???
?60??????????????bar.add(???editMenu???);???
?61????
?62??????????????Container???container???=???getContentPane();???
?63????
?64??????????????FlowLayout???lay=new???FlowLayout();???
?65??????????????lay.setAlignment(???FlowLayout.LEFT???);???
?66????
?67??????????????contralPanel???=???new???JPanel();???
?68??????????????contralPanel.setLayout(???lay???);???
?69????
?70??????????????urllist???=???new???URLList();???
?71????
?72??????????????Icon???back???=???new???ImageIcon(???"back.gif"???);???
?73??????????????backButton???=???new???JButton(???"back",back???);???
?74??????????????backButton.addActionListener(???
?75??????????????new???ActionListener()???
?76??????????????{???
?77??????????????public???void???actionPerformed(???ActionEvent???event???)???
?78??????????????????????????{???
?79??????????????????????????String???strback=new???String(???urllist.back()???);???
?80??????????????????????????System.out.println(???strback???);???
?81??????????????????????????if(???!strback.equals(???"Noop"???)???)???
?82??????????????????????????getThePage(???strback???);???
?83????????????????????????????
?84??????????????????????????}???
?85??????????????????}???
?86??????????????);???
?87??????contralPanel.add(???backButton???);???
?88????
?89??????????????Icon???fwd???=???new???ImageIcon(???"fwd.gif"???);???
?90??????????????fwdButton???=???new???JButton(???"fwd",fwd???);???
?91??????????????fwdButton.addActionListener(???
?92??????????????new???ActionListener()???
?93??????????????{???
?94??????????????public???void???actionPerformed(???ActionEvent???event???)???
?95??????????????????????????{???
?96??????????????????????????String???strfwd=new???String(???urllist.forward()???);???
?97??????????????????????????System.out.println(???strfwd???);???
?98??????????????????????????if(???!strfwd.equals(???"Noop"???)???)???
?99??????????????????????????getThePage(???strfwd???);???
100????????????????????????????
101??????????????????????????}???
102??????????????????}???
103??????????????);???
104??????????????contralPanel.add(???fwdButton???);???
105????
106??????????????//???create???enterField???and???register???its???listener???
107??????????????enterField???=???new???JTextField(???"Enter???file???URL???here",24???);???
108????
109??????????????enterField.addActionListener(???
110????
111????????????????????new???ActionListener()???{???
112????
113??????????????????????????//???get???document???specified???by???user???
114??????????????????????????public???void???actionPerformed(???ActionEvent???event???)???
115??????????????????????????{???
116??????????????????????????urllist.push(???event.getActionCommand()???);???
117??????????????????????????getThePage(???event.getActionCommand()???);???
118??????????????????????????}???
119????
120????????????????????}?????//???end???anonymous???inner???class???
121????
122??????????????);???//???end???call???to???addActionListener???
123????
124??????????????enterField.addMouseListener(???
125??????????????new???MouseListener(){???
126??????????????public???void???mouseClicked(???MouseEvent???e???)???
127??????????????{???
128??????????????enterField.selectAll();???
129??????????????}???
130????
131??????????????public???void???mousePressed(???MouseEvent???e???)???
132??????????????{???
133??????????????}???
134????
135??????????????public???void???mouseReleased(???MouseEvent???e???)???
136??????????????{???
137??????????????}???
138??????????????public???void???mouseEntered(???MouseEvent???e???)???
139??????????????{???
140??????????????}???
141????????????????
142????????????????
143??????????????public???void???mouseExited(???MouseEvent???e???)???
144??????????????{???
145??????????????}???
146??????????????}???
147??????????????);???
148????
149??????????????contralPanel.add(???enterField???);???
150????
151??????????????container.add(???contralPanel,???BorderLayout.NORTH???);???
152??????????????//???create???contentsArea???and???register???HyperlinkEvent???listener???
153??????????????contentsArea???=???new???JEditorPane();???
154??????????????contentsArea.setEditable(???false???);???
155????
156??????????????contentsArea.addHyperlinkListener(???
157????
158????????????????????new???HyperlinkListener()???{???
159????
160??????????????????????????//???if???user???clicked???hyperlink,???go???to???specified???page???
161??????????????????????????public???void???hyperlinkUpdate(???HyperlinkEvent???event???)???
162??????????????????????????{???
163????????????????????????????????if???(???event.getEventType()???==???
164??????????????????????????????????????????HyperlinkEvent.EventType.ACTIVATED???)???
165??????????????????????????????????????????{???
166??????????????????????????????????????????urllist.push(???event.getURL().toString()???);???
167??????????????????????????????????????????getThePage(???event.getURL().toString()???);???
168??????????????????????????????????????????}???
169??????????????????????????}???
170????
171????????????????????}?????//???end???anonymous???inner???class???
172????
173??????????????);???//???end???call???to???addHyperlinkListener???
174????
175??????????????container.add(?????new???JScrollPane(???contentsArea???)???,???
176????????????????????BorderLayout.CENTER???);???
177????
178??????????????setSize(???1000,???700???);???
179??????????????setVisible(???true???);???
180????????}???
181????
182????????//???load???document;???change???mouse???cursor???to???indicate???status???
183????????private???void???getThePage(???String???location???)???
184????????{???
185??????????????//???change???mouse???cursor???to???WAIT_CURSOR???
186??????????????setCursor(???Cursor.getPredefinedCursor(???
187????????????????????Cursor.WAIT_CURSOR???)???);???
188????
189??????????????if(!location.startsWith(???"http://"???))???
190??????????????location="http://"???+???location;???
191????
192??????????????//???load???document???into???contentsArea???and???display???location???in???
193??????????????//???enterField???
194??????????????try???{???
195????????????????????contentsArea.setPage(???location???);???
196????????????????????enterField.setText(???location???);???
197??????????????}???
198????
199??????????????//???process???problems???loading???document???
200??????????????catch???(???IOException???ioException???)???{???
201????????????????????JOptionPane.showMessageDialog(???this,???
202??????????????????????????"Error???retrieving???specified???URL",???
203??????????????????????????"Bad???URL",???JOptionPane.ERROR_MESSAGE???);???
204??????????????}???
205????
206??????????????setCursor(???Cursor.getPredefinedCursor(???
207????????????????????Cursor.DEFAULT_CURSOR???)???);???
208????????}???
209????
210????????//???begin???application???execution???
211????????public???static???void???main(???String???args[]???)???
212????????{???
213??????????????WebReader???application???=???new???WebReader();???
214????
215??????????????application.setDefaultCloseOperation(???
216????????????????????JFrame.EXIT_ON_CLOSE???);???
217????
218????????}???
219????
220
??}?????//???end???class???WebReader???
221??class???URLList???
222??{???
223??private???int???now???=???0;???
224??private???Vector???vector;???
225????
226??URLList()???
227??{???
228??vector???=???new???Vector(???1???);???
229??}???
230??public???void???push(String???url)???
231??{???
232??vector.add(url);???
233??now???=???vector.size()-1;???
234??}???
235????
236??public???String???back()???
237??{???
238??System.out.println(???"back?????"???+???now???);???
239??if(???now???==???0???)???
240??return(???"Noop"???);???
241??else???
242??{???
243??now--;???
244??System.out.println(???"back----"???+???now???);???
245??return(???(String)vector.get(???now???));???
246??}???
247??}???
248????
249??public???String???forward()???
250??{???
251??System.out.println(???"fwd"???+???now???+???vector.size()???);???
252??if(???(???vector.size()???==???0???)???||???(???now???==???(???vector.size()-1???)???)???)???
253??return(???"Noop"???);???
254??else???
255??{???
256??now++;???
257??System.out.println(???"fwd+++"???+???now???);???
258??return(???(String)vector.get(???now???));???
259??}???
260??}???
261??public???int???getnow()???
262??{???
263??return???now;???
264??}???
265??}?
地震讓大伙知道：居安思危，才是生存之道。
posted on 2007-03-09 08:22
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