記事本 demo
package demo;
import java.awt.event.*;
import java.io.*;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
public class TXT extends JFrame {
private JMenuBar JMB;
private JMenu m1;
private JMenu m2;
private JMenu m3;
private JMenuItem mi1; // 變量名字不能用 123， 後期無法維護 ， 從新定義
private JMenuItem mi2;
private JMenuItem mi3;
private JMenuItem mi4;
private JMenuItem mi5;
private JMenuItem mi6;
private JMenuItem mi7;
private JMenuItem mi8;
//窗口組件
JFileChooser filechooser = new JFileChooser();
JScrollPane sp = new JScrollPane();
JTextArea ta = new JTextArea();
protected Object desc;
public TXT(){
this.setDefaultCloseOperation(TXT.EXIT_ON_CLOSE);
sp.getViewport().add(ta);
this.getContentPane().add(sp);
ta.getText();
JMB = new JMenuBar();
this.setJMenuBar(JMB);
//按鈕
m1 = new JMenu("文件");
m2 = new JMenu("功能");
m3 = new JMenu("幫助");
JMB.add(m1);
JMB.add(m2);
JMB.add(m3);
mi1 = new JMenuItem("新建");
mi2 = new JMenuItem("保存");
mi3 = new JMenuItem("打開");
mi4 = new JMenuItem("複製");
mi5 = new JMenuItem("粘貼");
mi6 = new JMenuItem("幫助");
mi7 = new JMenuItem("另存爲");
mi8 = new JMenuItem("退出");
m1.add(mi1);
m1.add(mi2);
m1.add(mi3);
m1.add(mi7);
m1.add(mi8);
m2.add(mi4);
m2.add(mi5);
m3.add(mi6);
//添加事件處理
mi1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi1) {
if(mi1.getActionCommand().equals("新建")){ //事件監聽器是內部類了 不須要這個判斷
demo d = new demo();
Thread t = new Thread(d);
t.start();
}
}
});
mi2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi2) {
if(mi2.getActionCommand().equals("保存")){
int i = filechooser.showSaveDialog(TXT.this);
if(i == JFileChooser.APPROVE_OPTION){
File f = filechooser.getSelectedFile();
FileOutputStream out;
try {
out = new FileOutputStream(f);
out.write(ta.getText().getBytes()); // 試試輸入內容不少會不會有問題, 1MB
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
});
mi3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi3) {
if(mi3.getActionCommand().equals("打開")){
int i = filechooser.showOpenDialog(TXT.this);
if(i == JFileChooser.APPROVE_OPTION){
File f = filechooser.getSelectedFile();
try {
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
String aline = br.readLine();
while(aline != null);
ta.append(aline+"/r/n");
fr.close();
br.close();
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
});
mi7.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi7) {
if(mi7.getActionCommand().equals("另存爲")){
int i = filechooser.showSaveDialog(TXT.this);
if(i == JFileChooser.APPROVE_OPTION){
File f = filechooser.getSelectedFile();
FileOutputStream out;
try {
out = new FileOutputStream(f);
out.write(ta.getText().getBytes());
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
});
mi8.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi8) { //是否是要檢測下是否保存過。 彈出提示框
if(mi8.getActionCommand().equals("退出")){
System.exit(0);
}
}
});
}
public static void main(String[] args){
JFrame t = new TXT();
t.setTitle("記事本");
t.setSize(500, 500);
t.setVisible(true);
}
}
//新建窗口端口
class demo implements Runnable{
public void run(){
TXT t = new TXT();
t.setTitle("記事本");
t.setSize(500, 500);
t.setVisible(true);
}
}
// 請添加上 其餘菜單事件 複製 黏貼...
2017-5-15 18:06:01java
package demo;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.*;
import java.io.*;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
// 這個有必要繼承 ClipboardOwner 嗎？
public class TXT extends JFrame implements ClipboardOwner {
private JMenuBar JMB;
private JMenu File; // 用fileMenu, 變量首字母不要用大寫，下面同理.你這個File 更系統文件File 都重名了
private JMenu Edit; // 去學習些java 命名規範。 （百度能夠查到）
private JMenu Help;
private JMenu View;
private JMenu Ormat;
private JMenuItem FileNew;
private JMenuItem FileSave;
private JMenuItem FileOpen;
private JMenuItem EditCopy;
private JMenuItem EditPaste;
private JMenuItem HelpHelp;
private JMenuItem FileSaveAs;
private JMenuItem FileQuit;
private JMenuItem ViewStatusBar;
private JMenuItem OrmatTypeface;
Clipboard clb =null;
//窗口組件
JFileChooser filechooser = new JFileChooser();
JScrollPane sp = new JScrollPane();
JTextArea ta = new JTextArea();
protected Object desc;
public TXT(){
this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
sp.getViewport().add(ta);
this.getContentPane().add(sp);
ta.getText();
JMB = new JMenuBar();
this.setJMenuBar(JMB);
//按鈕
File = new JMenu("文件");
Edit = new JMenu("功能");
Help = new JMenu("幫助");
View = new JMenu("查看");
Ormat = new JMenu("格式");
JMB.add(File);
JMB.add(Edit);
JMB.add(Help);
JMB.add(View);
JMB.add(Ormat);
FileNew = new JMenuItem("新建");
FileSave = new JMenuItem("保存");
FileOpen = new JMenuItem("打開");
EditCopy = new JMenuItem("複製");
EditPaste = new JMenuItem("粘貼");
HelpHelp = new JMenuItem("幫助");
FileSaveAs = new JMenuItem("另存爲");
FileQuit = new JMenuItem("退出");
ViewStatusBar = new JMenuItem("狀態欄");
OrmatTypeface = new JMenuItem("字體");
File.add(FileNew);
File.add(FileSave);
File.add(FileOpen);
File.add(FileSaveAs);
File.add(FileQuit);
Edit.add(EditCopy);
Edit.add(EditPaste);
Help.add(HelpHelp);
View.add(ViewStatusBar);
Ormat.add(OrmatTypeface);
//添加事件處理
addWindowListener(new WindowListener() {
@Override
public void windowIconified(WindowEvent arg0) {
}
@Override
public void windowDeiconified(WindowEvent arg0) {
}
@Override
public void windowDeactivated(WindowEvent arg0) {
}
@Override
public void windowClosed(WindowEvent arg0) {
}
@Override
public void windowActivated(WindowEvent arg0) {
}
@Override
public void windowOpened(WindowEvent arg0) {
}
@Override
public void windowClosing(WindowEvent arg0) {
// 下面代碼跟後面的exit 方法裏面的代碼重複了， 抽成一個方法，調用. 不要寫兩個代碼如出一轍的
if(ta.getText().equals("")){
System.exit(0);
}
int it = JOptionPane.showConfirmDialog(TXT.this, "是否保存到D：//java程序//實驗文件//新建文本文檔.txt","結束程序",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
if(JOptionPane.YES_OPTION == it){
File f = new File("D:\\java程序\\實驗文件\\新建文本文檔.txt");
try {
FileWriter fw = new FileWriter(f);
BufferedWriter bw = new BufferedWriter(fw);
PrintWriter pw = new PrintWriter(bw); // 爲何加一個這個writer
pw.print(ta.getText()); // BufferedWriter.write ("xxxx") 就能夠了
bw.close();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}else if(JOptionPane.NO_OPTION == it) {
System.exit(0);
}else if(JOptionPane.CANCEL_OPTION == it){
return;
}
}
});
FileNew.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi1) {
demo d = new demo();
Thread t = new Thread(d);
t.start();
}
});
FileSave.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi2) {
int i = filechooser.showSaveDialog(TXT.this);
if(i == JFileChooser.APPROVE_OPTION){
File f = filechooser.getSelectedFile();
FileOutputStream out;
try {
out = new FileOutputStream(f);
out.write(ta.getText().getBytes());
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
FileOpen.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi3) {
int i = filechooser.showOpenDialog(TXT.this);
if(i == JFileChooser.APPROVE_OPTION){
File f = filechooser.getSelectedFile();
try {
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
String aline = br.readLine();
while(aline != null);
ta.append(aline+"/r/n");
fr.close();
br.close();
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
});
FileSaveAs.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi7) {
int i = filechooser.showSaveDialog(TXT.this);
if(i == JFileChooser.APPROVE_OPTION){
File f = filechooser.getSelectedFile();
FileOutputStream out;
try {
out = new FileOutputStream(f);
out.write(ta.getText().getBytes());
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
FileQuit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent mi8) {
if(ta.getText().equals("")){
System.exit(0);
}
int it = JOptionPane.showConfirmDialog(TXT.this, "是否保存到D：//java程序//實驗文件//新建文本文檔.txt","結束程序",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
if(JOptionPane.YES_OPTION == it){
File f = new File("D:\\java程序\\實驗文件\\新建文本文檔.txt");
try {
OutputStream out = new FileOutputStream(f);
String str = ta.getText();
byte[] buf = new byte[1024*5]; // 這個不對， 你肯定有把內容保存到文件？
out.write(buf);
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}else if(JOptionPane.NO_OPTION == it) {
System.exit(0);
}else if(JOptionPane.CANCEL_OPTION == it){
return;
}
}
});
EditCopy.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Clipboard clb = Toolkit.getDefaultToolkit().getSystemClipboard();
StringSelection ss = new StringSelection(ta.getText());
clb.setContents(ss, null);
}
});
EditPaste.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
Clipboard clb = Toolkit.getDefaultToolkit().getSystemClipboard();
Transferable clbt = clb.getContents(null);
if(clbt!=null){
if(clbt.isDataFlavorSupported(DataFlavor.stringFlavor));
String str;
try {
str = (String)clbt.getTransferData(DataFlavor.stringFlavor);
ta.append(str);
} catch (UnsupportedFlavorException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
}
public static void main(String[] args){
JFrame t = new TXT();
t.setTitle("記事本");
t.setSize(500, 500);
t.setVisible(true);
}
@Override
public void lostOwnership(Clipboard clipboard, Transferable contents) {
}
}
//新建窗口端口
class demo implements Runnable{
public void run(){
TXT t = new TXT();
t.setTitle("記事本");
t.setSize(500, 500);
t.setVisible(true);
}
}
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