简易记事本，V0.1

终于把马士兵的J2SE的视频了…前两天在学校用了一个下午写了一个很简易的Swing记事本，这也是自己独立写的一个小程序，大约500行，第一次写这么多…哈哈

先把源码弄出来

Code:

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.undo.UndoManager;
public class NotePad extends JFrame {
private JMenuBar jmb = new JMenuBar();// 菜单栏容器
private JMenu jm1 = new JMenu("文件");
private JMenu jm2 = new JMenu("编辑");
private JMenu jm3 = new JMenu("帮助");
private JMenu jm4 = new JMenu("格式");
private JMenuItem openItem = new JMenuItem("打开");
private JMenuItem newItem = new JMenuItem("新建");
private JMenuItem saveItem = new JMenuItem("保存");
private JMenuItem otherSaveItem = new JMenuItem("另存为");
private JMenuItem closeItem = new JMenuItem("退出");
private JMenuItem reStepItem = new JMenuItem("撤销");
private JMenuItem cutItem = new JMenuItem("剪切");
private JMenuItem copyItem = new JMenuItem("复制");
private JMenuItem casteItem = new JMenuItem("粘贴");
private JMenuItem replaceItem = new JMenuItem("查找和替换");
private JMenuItem allItem = new JMenuItem("全选");
private JMenuItem helpItem = new JMenuItem("关于");
private JMenuItem autoEnterItem = new JMenuItem("自动换行");
private JTextArea jta = new JTextArea(10, 10);
private JScrollPane jsp = new JScrollPane(jta);
private boolean alOpen = false;// 判断文件是否是从外部读取的
private boolean alSave = false;// 判断文件是否已经保存修改
private String openPath = "";
private int count = 0;// 控制查找时的第二次点击时的起始位置
static UndoManager manager = new UndoManager();// UndoManager 管理
// UndoableEdit
// 列表，提供撤消或恢复适当编辑的方法
public NotePad() {
super("记事本");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addWindowListener(new WindowAdapter() {// 为窗口的关闭添加监听
public void windowClosing(WindowEvent e) {
otherSave();
}
});
jm1.add(newItem);
jm1.add(openItem);
jm1.add(saveItem);
jm1.add(otherSaveItem);
jm1.addSeparator();
jm1.add(closeItem);
jm2.add(reStepItem);
jm2.addSeparator();
jm2.add(cutItem);
jm2.add(copyItem);
jm2.add(casteItem);
jm2.addSeparator();
jm2.add(replaceItem);
jm2.addSeparator();
jm2.add(allItem);
jm3.add(helpItem);
jm4.add(autoEnterItem);
jmb.add(jm1);
jmb.add(jm2);
jmb.add(jm4);
jmb.add(jm3);
openItem.addActionListener(new ActionListener() {// 为打开事件添加监听器
public void actionPerformed(ActionEvent e) {
jta.setText("");
alOpen = true;
JFileChooser chooser = new JFileChooser();
int returnVal = chooser.showOpenDialog(null);// 打开窗口没有父级窗口，可以随便移动
File f = chooser.getSelectedFile();// 获得选择的文件
if (returnVal == JFileChooser.APPROVE_OPTION) {
openPath = f.getAbsolutePath();
// 打开文件输入
try {
FileReader fr = new FileReader(f);
BufferedReader in = new BufferedReader(fr);
// ////缓存文件
FileWriter fwCheck = new FileWriter("D:/$~check.txt");
BufferedWriter out = new BufferedWriter(fwCheck);
PrintWriter pw = new PrintWriter(fwCheck);// 文本的复制使用这个
// ////缓存文件
String s = "";
while ((s = in.readLine()) != null) {
jta.append(s + "/n");
pw.println(s);
}
out.flush();// 刷新缓冲区
fr.close();
fwCheck.close();
} catch (Exception e1) {
e1.printStackTrace();
}
}
}
});
closeItem.addActionListener(new ActionListener() {// 为关闭按钮添加监听器
public void actionPerformed(ActionEvent e) {
otherSave();
}
});
newItem.addActionListener(new ActionListener() {// 为新建按钮添加监听器，两种情况，一是有内容时点新建，二是无内容时点新建
public void actionPerformed(ActionEvent e) {
if (jta.getText().equals("")) {// 无内容时,两种可能，一是本来就没有内容，二是打开东西后手工删除的，这时需要询问是否保存
// 1.
if (alOpen == false) {
jta.setText("");
} else {// 2.
File fileCheck = new File("D:/$~check.txt");
int statVal = JOptionPane.showConfirmDialog(null,
"是否保存文件？");
if (statVal == JOptionPane.YES_OPTION) {
// 添加保存文件对话框,同时删除缓存文件
fileCheck.delete();
JFileChooser saveChooser = new JFileChooser();
int flagVal = saveChooser.showSaveDialog(null);
if (flagVal == saveChooser.APPROVE_OPTION) {
String filePath = "";
filePath = saveChooser.getSelectedFile()
.getAbsolutePath();
File newF = new File(filePath);
try {
FileWriter fw = new FileWriter(newF);
fw.write("");
fw.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
if (statVal == JOptionPane.NO_OPTION) {
fileCheck.delete();
jta.setText("");
}
}
} else {// 有内容时点击新建
File fileCheck = new File("D:/$~check.txt");
String jtaStr = jta.getText();
String checkStr = "";
String s = "";
try {
FileReader fr = new FileReader(fileCheck);
BufferedReader in = new BufferedReader(fr);
while ((s = in.readLine()) != null) {
checkStr = checkStr + s + "/n";
}
fr.close();
} catch (Exception ex) {
ex.printStackTrace();
}
if (checkStr.equals(jta.getText())) {// 如果没有改动
jta.setText("");
} else {// 如果改动
int statVal = JOptionPane.showConfirmDialog(null,
"是否保存文件？");
if (statVal == JOptionPane.YES_OPTION) {
// 添加保存文件对话框
fileCheck.delete();
JFileChooser saveChooser = new JFileChooser();
int flagVal = saveChooser.showSaveDialog(null);
if (flagVal == saveChooser.APPROVE_OPTION) {
String filePath = "";
filePath = saveChooser.getSelectedFile()
.getAbsolutePath();
File newF = new File(filePath);
try {// *
FileWriter fw = new FileWriter(newF);
BufferedWriter bw = new BufferedWriter(fw);
String mainText = jta.getText();
bw.write(mainText);
bw.flush();
bw.close();
fw.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
if (statVal == JOptionPane.NO_OPTION) {
fileCheck.delete();
jta.setText("");
}
}
}
}
});
saveItem.addActionListener(new ActionListener() {// 为保存按钮添加监听器
public void actionPerformed(ActionEvent e) {
// 保存直接是覆盖源文件即可
alSave = true;
File saveFile = new File(openPath);
String mainText = jta.getText();
try {
FileWriter fw = new FileWriter(saveFile);
fw.write(mainText);
fw.flush();
fw.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
otherSaveItem.addActionListener(new ActionListener() {// 为另存为按钮添加监听器
public void actionPerformed(ActionEvent e) {
JFileChooser otherChooser = new JFileChooser();
int flagVal = otherChooser.showSaveDialog(null);
if (flagVal == JFileChooser.APPROVE_OPTION) {
String mainText = jta.getText();
String filePath = otherChooser.getSelectedFile()
.getAbsolutePath();
File saveFile = new File(filePath);
try {
FileWriter fw = new FileWriter(saveFile);
fw.write(mainText);
fw.flush();
fw.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
});
cutItem.addActionListener(new ActionListener() {// 剪切操作
public void actionPerformed(ActionEvent e) {
jta.cut();
}
});
copyItem.addActionListener(new ActionListener() {// 复制操作
public void actionPerformed(ActionEvent e) {
jta.copy();
}
});
casteItem.addActionListener(new ActionListener() {// 粘贴操作
public void actionPerformed(ActionEvent e) {
jta.paste();
}
});
autoEnterItem.addActionListener(new ActionListener() {// 自动换行
public void actionPerformed(ActionEvent e) {
if (jta.getLineWrap() == true) {// 如果获取已经换行
jta.setLineWrap(false);// 不设置换行
} else {
jta.setLineWrap(true);
}
}
});
helpItem.addActionListener(new ActionListener() {// 为帮助主题按钮添加监听器
public void actionPerformed(ActionEvent e) {
JFrame jf = new JFrame("帮助主题");
JLabel jl = new JLabel(" 记事本V0.1 薛琪 2011-4-26 ");
jf.add(jl, BorderLayout.CENTER);
jf.setBounds(80, 80, 250, 140);
jf.setVisible(true);
}
});
jta.getDocument().addUndoableEditListener(manager);// CSDN搜的，为文本框里文本注册监听器，因为操作对象是文本
reStepItem.addActionListener(new ActionListener() {// 撤销
public void actionPerformed(ActionEvent e) {
if (manager.canUndo()) {// 如果可以撤销
manager.undo();
}
}
});
allItem.addActionListener(new ActionListener() {// 全选
public void actionPerformed(ActionEvent e) {
jta.selectAll();
}
});
replaceItem.addActionListener(new ActionListener() {// 查找和替换
public void actionPerformed(ActionEvent e) {
final JFrame f = new JFrame("查找和替换");
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
final JTextField jtf1 = new JTextField(20);
final JTextField jtf2 = new JTextField(20);
JLabel jl1 = new JLabel("查找内容(N)：");
JLabel jl2 = new JLabel("替换为(P)：");
JButton b1 = new JButton("查找下一个");
JButton b2 = new JButton("替换");
JButton b3 = new JButton("全部替换");
JButton b4 = new JButton("取消");
p1.setLayout(new GridLayout(2, 2));
// p2.setLayout(new GridLayout(2,2));
p1.add(jl1);
p1.add(jtf1);
p1.add(jl2);
p1.add(jtf2);
p2.add(b1);
p2.add(b2);
p2.add(b3);
p2.add(b4);
f.add(p1, BorderLayout.NORTH);
f.add(p2, BorderLayout.CENTER);
f.pack();
f.setVisible(true);
b4.addActionListener(new ActionListener() {// 取消按钮
public void actionPerformed(ActionEvent e) {
f.setVisible(false);
count = 0;
}
});
b3.addActionListener(new ActionListener() {// 全部替换
public void actionPerformed(ActionEvent e) {
String s1 = jtf1.getText();
String s2 = jtf2.getText();
String mainText = jta.getText();
if (mainText.indexOf(s1) != -1) {
String mainText1 = mainText.replace(s1, s2);
jta.setText(mainText1);
JOptionPane.showMessageDialog(null,
"全部替换已成功");
}
}
});
b2.addActionListener(new ActionListener() {// 替换
public void actionPerformed(ActionEvent e) {
String s1 = jtf1.getText();
String s2 = jtf2.getText();
String mainText = jta.getText();
int c = mainText.indexOf(s1);
if (c != -1) {
String mainText1 = mainText.replaceFirst(
s1, s2);
jta.setText(mainText1);
}
}
});
b1.addActionListener(new ActionListener() {// 查找下一个
public void actionPerformed(ActionEvent e) {
String s1 = jtf1.getText();
String mainText = jta.getText();
int start = mainText.indexOf(s1, count);
int replaceLength = s1.length();
int end = start + replaceLength;
jta.select(start, end);
count = count + end;
}
});
}
});
this.setJMenuBar(jmb);
this.add(jsp, BorderLayout.CENTER);
this.setSize(800, 600);
this.setVisible(true);
}
// 为关闭加方法，精简代码
public void otherSave() {
// 1.已经打开文件判断文件是否修改,使用缓存文件
if (alOpen) {
File fileCheck = new File("D:/$~check.txt");
String jtaStr = jta.getText();
String checkStr = "";
String s = "";
try {
FileReader fr = new FileReader(fileCheck);
BufferedReader in = new BufferedReader(fr);
while ((s = in.readLine()) != null) {
checkStr = checkStr + s + "/n";
}
// System.out.println(checkStr);
fr.close();
if (jtaStr.equals(checkStr)) {
int statVal = JOptionPane.showConfirmDialog(null, "确定关闭");
if (statVal == JOptionPane.YES_OPTION) {
fileCheck.delete();// 要删除文件，必须先关闭文件
System.exit(0);
}
} else {// 文件有改动
int statVal = JOptionPane
.showConfirmDialog(null, "是否保存文件？");
if (statVal == JOptionPane.YES_OPTION) {
// 添加保存文件对话框,关闭是另存为
JFileChooser saveChooser = new JFileChooser();
int flagVal = saveChooser.showSaveDialog(null);
if (flagVal == saveChooser.APPROVE_OPTION) {
String filePath = "";
filePath = saveChooser.getSelectedFile()
.getAbsolutePath();
// System.out.println(filePath);
File newF = new File(filePath);
FileWriter fw = new FileWriter(newF);
BufferedWriter bw = new BufferedWriter(fw);
String mainText = jta.getText();
bw.write(mainText);
bw.flush();
fw.close();
bw.close();
fileCheck.delete();
System.exit(0);
}
}
if (statVal == JOptionPane.NO_OPTION) {
fileCheck.delete();
System.exit(0);
}
}
} catch (Exception e1) {
e1.printStackTrace();
}
} else {
if (jta.getText().equals("")) {
int statVal = JOptionPane.showConfirmDialog(null, "确定关闭");
if (statVal == JOptionPane.YES_OPTION) {
System.exit(0);
}
} else {
int statVal = JOptionPane.showConfirmDialog(null, "是否保存文件？");
if (statVal == JOptionPane.YES_OPTION) {
// 添加保存文件对话框,关闭是另存为
JFileChooser saveChooser = new JFileChooser();
int flagVal = saveChooser.showSaveDialog(null);
if (flagVal == saveChooser.APPROVE_OPTION) {
String filePath = "";
filePath = saveChooser.getSelectedFile()
.getAbsolutePath();
File newF = new File(filePath);
FileWriter fw;
try {
fw = new FileWriter(newF);
BufferedWriter bw = new BufferedWriter(fw);
String mainText = jta.getText();
bw.write(mainText);
bw.flush();
fw.close();
bw.close();
System.exit(0);
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
}
}
public static void main(String[] args) {
// JFrame.setDefaultLookAndFeelDecorated(true);
new NotePad();
}
}

实现了打开，关闭，保存，复制，粘贴，撤销，剪切，查找，复制和替换，全部替换，自动换行…主要是练习了Swing和事件监听…

秒客网

简易记事本，V0.1

相关文章