java实现保存、打开功能 就向记事本一样的 保存、打开功能,那位大虾能指教一下,无从下手呀,或者给我提供一下 原代码正好 嘿嘿! 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 F:\j2sdk1.4.2_07\demo\jfc\Notepadjdk下的例子!!! 这是我刚才在网上搜索到的一个例子,我稍微改造了一下,把下面两段程序依次追加到这段程序的后面,保存为一个java文件,然后运行。网上例子很多的。import java.awt.*;import javax.swing.*;import java.awt.event.*;import java.io.*;import javax.swing.text.*;import javax.swing.event.*;import javax.swing.undo.*;import java.util.*;/** *<p>Title: 程序编辑器</p> *<p>Description: 增强的文本编辑程序</p> *<p>Copyright: Copyright (c) 2005</p> *<p>Company: </p> *@author 红色彼岸 *@version 0.1 */class ProEFrame extends JFrame{ private JFileChooser fileChooser = new JFileChooser(); private JMenuBar menuBar; private JMenu file, edit, format, help; private JMenuItem newItem, openItem, saveItem, saveAsItem, pageSetItem, printItem, exitItem; private JMenuItem undoItem, redoItem, cutItem, copyItem, pasteItem, deleteItem, findItem, findNextItem, replaceItem, goToLineItem, selectAllItem, timeItem; private JMenuItem autoNextLineItem, fontItem; private JMenuItem helpItem, aboutItem; private JTextArea textArea; private JScrollPane scrollPane; private final int TAB_SIZE = 4; private File fileName; private boolean isChange = false; private final UndoManager undo = new UndoManager(); public static void main(String[] args) { ProEFrame frame=new ProEFrame("记事本"); frame.setSize(600,400); frame.setVisible(true); frame.setDefaultCloseOperation(ProEFrame.EXIT_ON_CLOSE); } public ProEFrame(String title) { //设置窗体的标题栏和默认关闭操作 super(title); setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); //设置菜单栏和菜单的内容 menuBar = new JMenuBar(); file = new JMenu("文件(F)"); edit = new JMenu("编辑(E)"); format = new JMenu("格式(O)"); help = new JMenu("帮助(H)"); setQuickKey(file, 'F'); setQuickKey(edit, 'E'); setQuickKey(format, 'O'); setQuickKey(help, 'H'); newItem = new JMenuItem("新建(N)"); openItem = new JMenuItem("打开(O)..."); saveItem = new JMenuItem("保存(S)"); saveAsItem = new JMenuItem("另存为..."); pageSetItem = new JMenuItem("页面设置(U)..."); printItem = new JMenuItem("打印(P)..."); exitItem = new JMenuItem("退出"); setQuickKey(newItem, 'N'); setQuickKey(openItem, 'O'); setQuickKey(saveItem, 'S'); setQuickKey(pageSetItem, 'U'); setQuickKey(printItem, 'P'); file.add(newItem); file.add(openItem); file.add(saveItem); file.add(saveAsItem); file.addSeparator(); file.add(pageSetItem); file.add(printItem); file.addSeparator(); file.add(exitItem); undoItem = new JMenuItem("撤销(Z)"); redoItem = new JMenuItem("恢复(R)"); cutItem = new JMenuItem("剪切(X)"); copyItem = new JMenuItem("复制(C)"); pasteItem = new JMenuItem("粘贴(V)"); deleteItem = new JMenuItem("删除"); findItem = new JMenuItem("查找(F)..."); findNextItem = new JMenuItem("查找下一个"); replaceItem = new JMenuItem("替换..."); goToLineItem = new JMenuItem("转到(G)..."); selectAllItem = new JMenuItem("全选(A)"); timeItem = new JMenuItem("时间/日期"); setQuickKey(undoItem, 'Z'); setQuickKey(redoItem, 'R'); setQuickKey(cutItem, 'X'); setQuickKey(copyItem, 'C'); setQuickKey(pasteItem, 'V'); setQuickKey(findItem, 'F'); setQuickKey(goToLineItem, 'G'); setQuickKey(selectAllItem, 'A'); edit.add(undoItem); edit.add(redoItem); edit.addSeparator(); edit.add(cutItem); edit.add(copyItem); edit.add(pasteItem); edit.add(deleteItem); edit.addSeparator(); edit.add(findItem); edit.add(findNextItem); edit.add(replaceItem); edit.add(goToLineItem); edit.addSeparator(); edit.add(selectAllItem); edit.add(timeItem); autoNextLineItem = new JMenuItem("自动换行(W)"); fontItem = new JMenuItem("字体..."); setQuickKey(autoNextLineItem, 'W'); format.add(autoNextLineItem); format.add(fontItem); helpItem = new JMenuItem("帮助主题(H)"); aboutItem = new JMenuItem("关于ProE"); setQuickKey(helpItem, 'H'); help.add(helpItem); help.add(aboutItem); menuBar.add(file); menuBar.add(edit); menuBar.add(format); menuBar.add(help); setJMenuBar(menuBar); textArea = new JTextArea(); textArea.setTabSize(TAB_SIZE); //支持撤销/恢复操作的监听方法 textArea.getDocument().addUndoableEditListener(new UndoableEditListener() { public void undoableEditHappened(UndoableEditEvent evt) { undo.addEdit(evt.getEdit()); } }); //监听文档内容是否发生变化 textArea.getDocument().addDocumentListener( new DocumentListener() { public void changedUpdate(DocumentEvent de) { isChange = true; } public void insertUpdate(DocumentEvent de) { isChange = true; } public void removeUpdate(DocumentEvent de) { isChange = true; } } ); scrollPane = new JScrollPane(textArea); this.getContentPane().add(scrollPane, BorderLayout.CENTER); //测试用的方法 MenuItemEventHandler menuItemHandler = new MenuItemEventHandler(); newItem.addActionListener(menuItemHandler); openItem.addActionListener(menuItemHandler); saveItem.addActionListener(menuItemHandler); saveAsItem.addActionListener(menuItemHandler); pageSetItem.addActionListener(menuItemHandler); printItem.addActionListener(menuItemHandler); exitItem.addActionListener(menuItemHandler); undoItem.addActionListener(menuItemHandler); redoItem.addActionListener(menuItemHandler); cutItem.addActionListener(menuItemHandler); copyItem.addActionListener(menuItemHandler); pasteItem.addActionListener(menuItemHandler); deleteItem.addActionListener(menuItemHandler); findItem.addActionListener(menuItemHandler); findNextItem.addActionListener(menuItemHandler); replaceItem.addActionListener(menuItemHandler); goToLineItem.addActionListener(menuItemHandler); selectAllItem.addActionListener(menuItemHandler); timeItem.addActionListener(menuItemHandler); autoNextLineItem.addActionListener(menuItemHandler); fontItem.addActionListener(menuItemHandler); helpItem.addActionListener(menuItemHandler); aboutItem.addActionListener(menuItemHandler); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { exitPerformed(); } }); } //辅助方法:为菜单或者菜单项设定快捷键 private void setQuickKey(AbstractButton button, char quickKey) { String type = button.getClass().getSimpleName(); if(type.equals("JMenu")) button.setMnemonic(quickKey); else if(type.equals("JMenuItem")) { JMenuItem menuItem = (JMenuItem)button; menuItem.setAccelerator(KeyStroke.getKeyStroke(quickKey, InputEvent.CTRL_MASK)); } } //辅助方法:测试JTextArea中文本是否有变化 private boolean hasChange() { return isChange; } //内部方法:响应菜单事件 private void newPerformed() { int value = -1; if(hasChange()) if(fileName != null && fileName.exists()) { String[] buttonTexts = {"保存", "不保存", "取消"}; value = JOptionPane.showOptionDialog(this, "源程序已经改变,请确认是否保存!", "保存更改?", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]); if(value == JOptionPane.YES_OPTION) savePerformed(); else if(value == JOptionPane.NO_OPTION) { fileName = null; textArea.setText(""); setTitle("程序编辑器"); return; } else if(value == JOptionPane.CANCEL_OPTION) return; } else { saveAsPerformed(); fileName = null; textArea.setText(""); setTitle("程序编辑器"); return; } fileName = null; textArea.setText(""); setTitle("程序编辑器"); isChange = false; return; } private void openPerformed() { BufferedReader input = null; String text; int ret = fileChooser.showOpenDialog(this); if(ret != JFileChooser.APPROVE_OPTION) return; newPerformed(); fileName = fileChooser.getSelectedFile(); if(fileName.exists() && fileName.canRead()) { setTitle("程序编辑器: " + fileName.getName()); try{ input = new BufferedReader(new FileReader(fileName)); while((text = input.readLine()) != null) textArea.append(text + "\n"); input.close(); } catch(IOException e) { JOptionPane.showMessageDialog(this, "文件打开错误,没有打开"); } finally { input = null; } } isChange = false; } private void savePerformed() { if(!hasChange()) return; PrintWriter output = null; if(fileName != null && fileName.exists()) { try{ output = new PrintWriter(fileName); output.write(textArea.getText()); } catch(IOException e) { JOptionPane.showMessageDialog(this, "文件写入错误,没有保存"); } finally { output.close(); output = null; } isChange = false; } else saveAsPerformed(); } private void saveAsPerformed() { if(!hasChange()) return; PrintWriter output = null; int ret = fileChooser.showSaveDialog(this); if(ret != JFileChooser.APPROVE_OPTION) { isChange = true; return; } fileName = fileChooser.getSelectedFile(); setTitle("程序编辑器: " + fileName.getName()); try{ output = new PrintWriter(fileName); output.write(textArea.getText()); } catch(IOException e){ JOptionPane.showMessageDialog(this, "文件写入错误,没有保存"); } finally{ output.close(); output = null; } isChange = false; } private void pageSetPerformed() { System.out.println("显示页面设置对话框"); } private void printPerformed() { System.out.println("显示打印对话框"); } private void exitPerformed() { String[] buttonTexts = {"保存退出", "不保存退出", "取消"}; int value = -1; if(hasChange()) { value = JOptionPane.showOptionDialog(this, "源程序已经改变,请是否选择保存或直接退出!", "退出程序", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]); switch(value) { case JOptionPane.YES_OPTION: savePerformed(); break; case JOptionPane.NO_OPTION: System.exit(0); break; case JOptionPane.CANCEL_OPTION: isChange = true; return; } } else System.exit(0); } private void undoPerformed() { try{ if(undo.canUndo()) undo.undo(); }catch(CannotUndoException e) { JOptionPane.showMessageDialog(this, "无法执行撤销操作", "撤销异常", JOptionPane.WARNING_MESSAGE); } } private void redoPerformed() { try{ if(undo.canRedo()) undo.redo(); }catch(CannotRedoException e) { JOptionPane.showMessageDialog(this, "无法执行恢复操作", "恢复异常", JOptionPane.WARNING_MESSAGE); } } private void cutPerformed() { textArea.cut(); } private void copyPerformed() { textArea.copy(); } private void pastePerformed() { textArea.paste(); } private void deletePerformed() { textArea.replaceRange(null, textArea.getSelectionStart(), textArea.getSelectionEnd()); } private void findPerformed() { //String findString = JOptionPane.showInputDialog(this, );String findString = JOptionPane.showInputDialog(this); } private void findNextPerformed() { System.out.println("查找下一个"); } private void replacePerformed() { System.out.println("替换"); } private void goToLinePerformed() { System.out.println("转到"); } private void selectAllPerformed() { textArea.selectAll(); } private void timePerformed() { textArea.insert((new Date()).toString(), textArea.getSelectionEnd()); } private void autoNextLinePerformed() { System.out.println("自动换行"); } private void fontPerformed() { System.out.println("字体"); } private void helpPerformed() { System.out.println("帮助主题"); } private void aboutPerformed() { System.out.println("关于程序"); } /** *<p>Title: </p> *<p>Description: 处理菜单出发的事件</p> *<p>Copyright: Copyright (c) 2005</p> *<p>Company: </p> *@author 红色彼岸 *@version 0.1 */ class MenuItemEventHandler implements ActionListener{ public void actionPerformed(ActionEvent e) { JMenuItem item = (JMenuItem)e.getSource(); if(item == newItem) newPerformed(); else if(item == openItem) openPerformed(); else if(item == saveItem) savePerformed(); else if(item == saveAsItem) saveAsPerformed(); else if(item == pageSetItem) pageSetPerformed(); else if(item == printItem) printPerformed(); else if(item == exitItem) exitPerformed(); else if(item == undoItem) undoPerformed(); else if(item == redoItem) redoPerformed(); else if(item == cutItem) cutPerformed(); else if(item == copyItem) copyPerformed(); else if(item == pasteItem) pastePerformed(); else if(item == deleteItem) deletePerformed(); else if(item == findItem) findPerformed(); else if(item == findNextItem) findNextPerformed(); else if(item == replaceItem) replacePerformed(); else if(item == goToLineItem) goToLinePerformed(); else if(item == selectAllItem) selectAllPerformed(); else if(item == timeItem) timePerformed(); else if(item == autoNextLineItem) autoNextLinePerformed(); else if(item == fontItem) fontPerformed(); else if(item == helpItem) helpPerformed(); else if(item == aboutItem) aboutPerformed(); } }} 如果我要是想从控件中获得保存的结果,该如何获得呀,比如我要把文本框中的内容,保存成TXT文件 我以前写的http://community.csdn.net/Expert/topic/5277/5277285.xml?temp=.323147应该能满足你的要求! 用文件流response.setContentType("application/txt");response.setHeader("Content-disposition","attachment; filename=\""+fileName+"\"");BufferedInputStream bufInStream = new BufferedInputStream(new FileInputStream(file));BufferedOutputStream bufOutStream = new BufferedOutputStream(response.getOutputStream());int readLine=0;readLine = bufInStream.read();while(readLine!=-1){ bufOutStream.write(readLine); readLine = bufInStream.read();}bufOutStream.close();bufInStream.close(); int c=213 , 如何打印 “a” 这个字母呢? 关于使用javac和java命令的问题 还是购物车 面试技巧(在线,急!) 100分求问/回答即给分 【100分】怎么遍历硬盘? TEST 请教:程序返回system#noboundexception是什么意思,我是做c++的,偶尔用次java就手忙脚乱的。各位帮忙 我的机器配置,为何用websphere这么慢?大家帮我分析分析? 怎样用ASCII码? String+ASCII 0x01+String,形成 byte[] 大家来找碴 向xml已存在的xml文件中添加节点内容
jdk下的例子!!!
网上例子很多的。
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.undo.*;
import java.util.*;/**
*<p>Title: 程序编辑器</p>
*<p>Description: 增强的文本编辑程序</p>
*<p>Copyright: Copyright (c) 2005</p>
*<p>Company: </p>
*@author 红色彼岸
*@version 0.1
*/
class ProEFrame extends JFrame{
private JFileChooser fileChooser = new JFileChooser(); private JMenuBar menuBar;
private JMenu file, edit, format, help;
private JMenuItem newItem, openItem, saveItem, saveAsItem, pageSetItem, printItem, exitItem;
private JMenuItem undoItem, redoItem, cutItem, copyItem, pasteItem, deleteItem, findItem, findNextItem, replaceItem, goToLineItem, selectAllItem, timeItem;
private JMenuItem autoNextLineItem, fontItem;
private JMenuItem helpItem, aboutItem;
private JTextArea textArea;
private JScrollPane scrollPane;
private final int TAB_SIZE = 4; private File fileName;
private boolean isChange = false; private final UndoManager undo = new UndoManager(); public static void main(String[] args)
{
ProEFrame frame=new ProEFrame("记事本");
frame.setSize(600,400);
frame.setVisible(true);
frame.setDefaultCloseOperation(ProEFrame.EXIT_ON_CLOSE);
}
public ProEFrame(String title) {
//设置窗体的标题栏和默认关闭操作
super(title);
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); //设置菜单栏和菜单的内容
menuBar = new JMenuBar();
file = new JMenu("文件(F)");
edit = new JMenu("编辑(E)");
format = new JMenu("格式(O)");
help = new JMenu("帮助(H)");
setQuickKey(file, 'F');
setQuickKey(edit, 'E');
setQuickKey(format, 'O');
setQuickKey(help, 'H');
newItem = new JMenuItem("新建(N)");
openItem = new JMenuItem("打开(O)...");
saveItem = new JMenuItem("保存(S)");
saveAsItem = new JMenuItem("另存为...");
pageSetItem = new JMenuItem("页面设置(U)...");
printItem = new JMenuItem("打印(P)...");
exitItem = new JMenuItem("退出");
setQuickKey(newItem, 'N');
setQuickKey(openItem, 'O');
setQuickKey(saveItem, 'S');
setQuickKey(pageSetItem, 'U');
setQuickKey(printItem, 'P');
file.add(newItem);
file.add(openItem);
file.add(saveItem);
file.add(saveAsItem);
file.addSeparator();
file.add(pageSetItem);
file.add(printItem);
file.addSeparator();
file.add(exitItem); undoItem = new JMenuItem("撤销(Z)");
redoItem = new JMenuItem("恢复(R)");
cutItem = new JMenuItem("剪切(X)");
copyItem = new JMenuItem("复制(C)");
pasteItem = new JMenuItem("粘贴(V)");
deleteItem = new JMenuItem("删除");
findItem = new JMenuItem("查找(F)...");
findNextItem = new JMenuItem("查找下一个");
replaceItem = new JMenuItem("替换...");
goToLineItem = new JMenuItem("转到(G)...");
selectAllItem = new JMenuItem("全选(A)");
timeItem = new JMenuItem("时间/日期"); setQuickKey(undoItem, 'Z');
setQuickKey(redoItem, 'R');
setQuickKey(cutItem, 'X');
setQuickKey(copyItem, 'C');
setQuickKey(pasteItem, 'V');
setQuickKey(findItem, 'F');
setQuickKey(goToLineItem, 'G');
setQuickKey(selectAllItem, 'A');
edit.add(undoItem);
edit.add(redoItem);
edit.addSeparator();
edit.add(cutItem);
edit.add(copyItem);
edit.add(pasteItem);
edit.add(deleteItem);
edit.addSeparator();
edit.add(findItem);
edit.add(findNextItem);
edit.add(replaceItem);
edit.add(goToLineItem);
edit.addSeparator();
edit.add(selectAllItem);
edit.add(timeItem); autoNextLineItem = new JMenuItem("自动换行(W)");
fontItem = new JMenuItem("字体..."); setQuickKey(autoNextLineItem, 'W'); format.add(autoNextLineItem);
format.add(fontItem); helpItem = new JMenuItem("帮助主题(H)");
aboutItem = new JMenuItem("关于ProE"); setQuickKey(helpItem, 'H'); help.add(helpItem);
help.add(aboutItem); menuBar.add(file);
menuBar.add(edit);
menuBar.add(format);
menuBar.add(help);
setJMenuBar(menuBar); textArea = new JTextArea();
textArea.setTabSize(TAB_SIZE);
//支持撤销/恢复操作的监听方法
textArea.getDocument().addUndoableEditListener(new UndoableEditListener() {
public void undoableEditHappened(UndoableEditEvent evt) {
undo.addEdit(evt.getEdit());
}
});
//监听文档内容是否发生变化
textArea.getDocument().addDocumentListener(
new DocumentListener() {
public void changedUpdate(DocumentEvent de) {
isChange = true;
}
public void insertUpdate(DocumentEvent de) {
isChange = true;
}
public void removeUpdate(DocumentEvent de) {
isChange = true;
}
}
);
scrollPane = new JScrollPane(textArea);
this.getContentPane().add(scrollPane, BorderLayout.CENTER); //测试用的方法
MenuItemEventHandler menuItemHandler = new MenuItemEventHandler();
newItem.addActionListener(menuItemHandler);
openItem.addActionListener(menuItemHandler);
saveItem.addActionListener(menuItemHandler);
saveAsItem.addActionListener(menuItemHandler);
pageSetItem.addActionListener(menuItemHandler);
printItem.addActionListener(menuItemHandler);
exitItem.addActionListener(menuItemHandler);
undoItem.addActionListener(menuItemHandler);
redoItem.addActionListener(menuItemHandler);
cutItem.addActionListener(menuItemHandler);
copyItem.addActionListener(menuItemHandler);
pasteItem.addActionListener(menuItemHandler);
deleteItem.addActionListener(menuItemHandler);
findItem.addActionListener(menuItemHandler);
findNextItem.addActionListener(menuItemHandler);
replaceItem.addActionListener(menuItemHandler);
goToLineItem.addActionListener(menuItemHandler);
selectAllItem.addActionListener(menuItemHandler);
timeItem.addActionListener(menuItemHandler);
autoNextLineItem.addActionListener(menuItemHandler);
fontItem.addActionListener(menuItemHandler);
helpItem.addActionListener(menuItemHandler);
aboutItem.addActionListener(menuItemHandler); addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
exitPerformed();
}
});
}
private void setQuickKey(AbstractButton button, char quickKey) {
String type = button.getClass().getSimpleName();
if(type.equals("JMenu"))
button.setMnemonic(quickKey);
else if(type.equals("JMenuItem")) {
JMenuItem menuItem = (JMenuItem)button;
menuItem.setAccelerator(KeyStroke.getKeyStroke(quickKey, InputEvent.CTRL_MASK));
}
} //辅助方法:测试JTextArea中文本是否有变化
private boolean hasChange() {
return isChange;
} //内部方法:响应菜单事件
private void newPerformed() {
int value = -1;
if(hasChange())
if(fileName != null && fileName.exists()) {
String[] buttonTexts = {"保存", "不保存", "取消"};
value = JOptionPane.showOptionDialog(this, "源程序已经改变,请确认是否保存!", "保存更改?", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]);
if(value == JOptionPane.YES_OPTION)
savePerformed();
else if(value == JOptionPane.NO_OPTION) {
fileName = null;
textArea.setText("");
setTitle("程序编辑器");
return;
}
else if(value == JOptionPane.CANCEL_OPTION)
return;
}
else {
saveAsPerformed();
fileName = null;
textArea.setText("");
setTitle("程序编辑器");
return;
}
fileName = null;
textArea.setText("");
setTitle("程序编辑器");
isChange = false;
return;
} private void openPerformed() {
BufferedReader input = null;
String text;
int ret = fileChooser.showOpenDialog(this);
if(ret != JFileChooser.APPROVE_OPTION)
return;
newPerformed();
fileName = fileChooser.getSelectedFile();
if(fileName.exists() && fileName.canRead()) {
setTitle("程序编辑器: " + fileName.getName());
try{
input = new BufferedReader(new FileReader(fileName));
while((text = input.readLine()) != null)
textArea.append(text + "\n");
input.close();
}
catch(IOException e) {
JOptionPane.showMessageDialog(this, "文件打开错误,没有打开");
}
finally {
input = null;
}
}
isChange = false;
}
private void savePerformed() {
if(!hasChange())
return;
PrintWriter output = null;
if(fileName != null && fileName.exists()) {
try{
output = new PrintWriter(fileName);
output.write(textArea.getText());
}
catch(IOException e)
{
JOptionPane.showMessageDialog(this, "文件写入错误,没有保存");
}
finally {
output.close();
output = null;
}
isChange = false;
}
else
saveAsPerformed();
}
private void saveAsPerformed() {
if(!hasChange())
return;
PrintWriter output = null;
int ret = fileChooser.showSaveDialog(this);
if(ret != JFileChooser.APPROVE_OPTION) {
isChange = true;
return;
} fileName = fileChooser.getSelectedFile();
setTitle("程序编辑器: " + fileName.getName());
try{
output = new PrintWriter(fileName);
output.write(textArea.getText());
}
catch(IOException e){
JOptionPane.showMessageDialog(this, "文件写入错误,没有保存");
}
finally{
output.close();
output = null;
}
isChange = false;
}
private void pageSetPerformed() {
System.out.println("显示页面设置对话框");
}
private void printPerformed() {
System.out.println("显示打印对话框");
}
private void exitPerformed() {
String[] buttonTexts = {"保存退出", "不保存退出", "取消"};
int value = -1;
if(hasChange()) {
value = JOptionPane.showOptionDialog(this, "源程序已经改变,请是否选择保存或直接退出!", "退出程序", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]);
switch(value)
{
case JOptionPane.YES_OPTION:
savePerformed();
break;
case JOptionPane.NO_OPTION:
System.exit(0);
break;
case JOptionPane.CANCEL_OPTION:
isChange = true;
return;
}
}
else
System.exit(0);
}
private void undoPerformed() {
try{
if(undo.canUndo())
undo.undo();
}catch(CannotUndoException e) {
JOptionPane.showMessageDialog(this, "无法执行撤销操作", "撤销异常", JOptionPane.WARNING_MESSAGE);
}
}
try{
if(undo.canRedo())
undo.redo();
}catch(CannotRedoException e) {
JOptionPane.showMessageDialog(this, "无法执行恢复操作", "恢复异常", JOptionPane.WARNING_MESSAGE);
}
}
private void cutPerformed() {
textArea.cut();
}
private void copyPerformed() {
textArea.copy();
}
private void pastePerformed() {
textArea.paste();
}
private void deletePerformed() {
textArea.replaceRange(null, textArea.getSelectionStart(), textArea.getSelectionEnd());
}
private void findPerformed() {
//String findString = JOptionPane.showInputDialog(this, );
String findString = JOptionPane.showInputDialog(this);
}
private void findNextPerformed() {
System.out.println("查找下一个");
}
private void replacePerformed() {
System.out.println("替换");
}
private void goToLinePerformed() {
System.out.println("转到");
}
private void selectAllPerformed() {
textArea.selectAll();
}
private void timePerformed() {
textArea.insert((new Date()).toString(), textArea.getSelectionEnd());
}
private void autoNextLinePerformed() {
System.out.println("自动换行");
}
private void fontPerformed() {
System.out.println("字体");
}
private void helpPerformed() {
System.out.println("帮助主题");
}
private void aboutPerformed() {
System.out.println("关于程序");
} /**
*<p>Title: </p>
*<p>Description: 处理菜单出发的事件</p>
*<p>Copyright: Copyright (c) 2005</p>
*<p>Company: </p>
*@author 红色彼岸
*@version 0.1
*/
class MenuItemEventHandler implements ActionListener{
public void actionPerformed(ActionEvent e) {
JMenuItem item = (JMenuItem)e.getSource();
if(item == newItem)
newPerformed();
else if(item == openItem)
openPerformed();
else if(item == saveItem)
savePerformed();
else if(item == saveAsItem)
saveAsPerformed();
else if(item == pageSetItem)
pageSetPerformed();
else if(item == printItem)
printPerformed();
else if(item == exitItem)
exitPerformed();
else if(item == undoItem)
undoPerformed();
else if(item == redoItem)
redoPerformed();
else if(item == cutItem)
cutPerformed();
else if(item == copyItem)
copyPerformed();
else if(item == pasteItem)
pastePerformed();
else if(item == deleteItem)
deletePerformed();
else if(item == findItem)
findPerformed();
else if(item == findNextItem)
findNextPerformed();
else if(item == replaceItem)
replacePerformed();
else if(item == goToLineItem)
goToLinePerformed();
else if(item == selectAllItem)
selectAllPerformed();
else if(item == timeItem)
timePerformed();
else if(item == autoNextLineItem)
autoNextLinePerformed();
else if(item == fontItem)
fontPerformed();
else if(item == helpItem)
helpPerformed();
else if(item == aboutItem)
aboutPerformed();
}
}
}
应该能满足你的要求!
response.setContentType("application/txt");
response.setHeader("Content-disposition","attachment; filename=\""+fileName+"\"");
BufferedInputStream bufInStream = new BufferedInputStream(new FileInputStream(file));
BufferedOutputStream bufOutStream = new BufferedOutputStream(response.getOutputStream());
int readLine=0;
readLine = bufInStream.read();
while(readLine!=-1){
bufOutStream.write(readLine);
readLine = bufInStream.read();
}
bufOutStream.close();
bufInStream.close();