给你个做好了的Java的源程序的记事本,自己看看就行了的,不怎么难的---
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class MyNotepad implements ActionListener{
private JFrame frame=new JFrame("新记事本");
private JTextArea jta=new JTextArea();
private String result="";
private boolean flag=true;
private File f;
private JButton jb=new JButton("开始");
private JButton jbt=new JButton("替换为");
private JButton jba=new JButton("全部替换");
private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");
private String value;
private int start=0;
private JFrame jf=new JFrame("查找");
private JFrame jfc=new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm=e.getActionCommand();
if("新建".equals(comm)){
if(!(frame.getTitle().equals("新记事本"))){
if(!flag){
write();
newNew();
}else{
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句,保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
}
}else if(!(jta.getText().isEmpty())){
}else if("打开".equals(comm)){
jfc.setDialogType(JFileChooser.OPEN_DIALOG);
int returnVal = jfc.showOpenDialog(null);
frame.setTitle(f.getName());
result=read();
value=result;
jta.setText(result);
}else if("保存".equals(comm)){
if(flag){
}else if("另存".equals(comm)){
int returnVal = jfc.showDialog(null,"另存");
}else if("退出".equals(comm)){
System.exit(0);
}else if("撤销".equals(comm)){
jta.setText(value);
}else if("剪切".equals(comm)){
value=jta.getText();
jta.cut();
}else if("复制".equals(comm)){
jta.copy();
}else if("粘贴".equals(comm)){
jta.paste();
}else if("删除".equals(comm)){
jta.replaceSelection(null);
}else if("全选".equals(comm)){
jta.selectAll();
}else if("查找".equals(comm)){
jf.add(jtf,BorderLayout.CENTER);
jf.add(jb,BorderLayout.SOUTH);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("替换".equals(comm)){
JLabel jl1=new JLabel("查找内容:");
jfc.setLayout(gl);
jfc.add(jl1);
jfc.add(jtf);
jfc.add(jb);
jfc.add(jt);
jfc.add(jbt);
jfc.add(jba);
jfc.pack();
jfc.setVisible(true);
jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("版本".equals(comm)){
JDialog jd=new JDialog(frame,"关于对话框");
JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");
jd.add(l,BorderLayout.CENTER);
jd.setVisible(true);
//jd.pack();
jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
}else if("开始".equals(comm)||"下一个".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jb.setText("下一个");
//value=value.substring(s+temp.length());//不能截取字串
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}else if("替换为".equals(comm)){
jta.replaceSelection(jt.getText());
}else if("全部替换".equals(comm)){
String temp=jta.getText();
temp=temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
public String read(){
String temp="";
try {
FileInputStream fis = new FileInputStream(f.getAbsolutePath());
while(true){
int num=fis.read(b);
if(num==-1)break;
temp=temp+new String(b,0,num);
fis.close();
} catch (Exception e1) {
e1.printStackTrace();
return temp;
public void write(){
FileOutputStream fos=new FileOutputStream(f);
fos.write(jta.getText().getBytes());
fos.close();
} catch (Exception e) {
e.printStackTrace();
public void newNew(){
frame.dispose();
new MyNotepad();
flag=true;
public MyNotepad(){
JMenuBar jmb=new JMenuBar();
String[][] menuItemLab={{"新建","打开","保存","另存","退出"},
{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},
{"版本"}};
for(int i=0;imenuLab.length;i++){
JMenu menu=new JMenu(menuLab[i]);
jmb.add(menu);
for(int j=0;jmenuItemLab[i].length;j++){
JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);
menu.add(jmi);
jmi.addActionListener(this);
frame.setJMenuBar(jmb);
jta.setLineWrap(true);//自动换行
JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板
frame.add(jsp);
jb.addActionListener(this);
jbt.addActionListener(this);
jba.addActionListener(this);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
public static void main(String[] args) {
/*这个相当详细了.
程序也不算太难.而且给老师看的时候效果比较好.因为有图形化界面,又实现一个比较实用的功能.老师会比较高兴的.
建立一个文件名为Change.java就可以编译了*/
/*
* 这个程序实现输入身高算出标准体重,输入体重,算出身高的功能
*/
import java.awt.*; //导入相关类包,这才样使用相应awt图形界面的类
import java.awt.event.*;//同上
public class Change extends Frame { //定义一个类Change, 父类是Frame(图形界面的)
Button b = new Button("互查"); //创建一个按钮的对象b,显示为"互查"
Label l1 = new Label("身高(cm)");//创建一个lable.显示身高
double heigth, weigth; //定义变量
double x, y; //定义变量
TextField tf1 = new TextField(null, 10);//添加Text框
public Change() {//类的构造函数,完成初始化
super("互查表");//创建窗口,标题为互查表
setLayout(new FlowLayout(FlowLayout.LEFT));//设置布局
add(l1);//把lable 身高放到window里
add(tf1);//把Text 框 放到窗口上
add(b);//把button放到窗口上
pack();//自动放到窗口里排列上边的组件
setVisible(true);//可以让用户看到窗口
addWindowListener(new WindowAdapter() {//如果按 X, 关闭窗口
public void windowClosing(WindowEvent e) {
});
b.addActionListener(new ButtonListener());//添加button监听函数
class ButtonListener implements ActionListener {//实现click button时功能操作
public void actionPerformed(ActionEvent e) {//当click调用
if (tf1.getText()!=null) {//检查tf1 test 是否为空
try {//取异常
x = Double.parseDouble(tf1.getText());//字符转为double型
} catch (NumberFormatException ex) {
tf1.setText("");//如果输入不是数字,设为空
if (tf1.getText().equals("")==true){//tf1是否为空
tf1.setText("" + heigth);}//显示身高
public static void main(String[] args) {//主函数,程序入口
new Change(); //建立类Change的对象,并调用他的构造函数Change().显示窗口
Java文件操作大全
①创建文件夹
//import java.io.*;
File myFolderPath = new File(%%1);
if (!myFolderPath.exists()) {
myFolderPath.mkdir();
catch (Exception e) {
System.out.println("新建目录操作出错");
File myFilePath = new File(%%1);
if (!myFilePath.exists()) {
myFilePath.createNewFile();
FileWriter resultFile = new FileWriter(myFilePath);
PrintWriter myFile = new PrintWriter(resultFile);
resultFile.close();
System.out.println("新建文件操作出错");
File myDelFile = new File(%%1);
myDelFile.delete();
System.out.println("删除文件操作出错");
File delFolderPath = new File(%%1);
delFolderPath.delete(); //删除空文件夹
System.out.println("删除文件夹操作出错");
File delfile=new File(%%1);
File[] files=delfile.listFiles();
for(int i=0;ifiles.length;i++){
if(files[i].isDirectory()){
files[i].delete();
File delfilefolder=new File(%%1);
if (!delfilefolder.exists()) {
delfilefolder.delete();
delfilefolder.mkdir();
System.out.println("清空目录操作出错");
// 逐行读取数据
FileReader fr = new FileReader(%%1);
BufferedReader br = new BufferedReader(fr);
br.close();
fr.close();
// 将数据写入文件
FileWriter fw = new FileWriter(%%1);
fw.flush();
fw.close();
} catch (IOException e) {
RandomAcessFile logFile=new RandomAcessFile(%%1,"rw");
long lg=logFile.length();
}catch(IOException ioe){
System.out.println("无法写入文件："+ioe.getMessage());
①.0.读取文件属性
// 文件属性的取得
File af = new File(%%1);
if (af.exists()) {
System.out.println(f.getName() + "的属性如下： 文件长度为：" + f.length());
System.out.println(f.isFile() ? "是文件" : "不是文件");
System.out.println(f.isDirectory() ? "是目录" : "不是目录");
System.out.println(f.canRead() ? "可读取" : "不");
System.out.println(f.canWrite() ? "是隐藏文件" : "");
System.out.println("文件夹的最后修改日期为：" + new Date(f.lastModified()));
} else {
System.out.println(f.getName() + "的属性如下：");
System.out.println("文件的最后修改日期为：" + new Date(f.lastModified()));
if(f.canRead()){
if(f.canWrite()){
①.1.写入属性
File filereadonly=new File(%%1);
boolean b=filereadonly.setReadOnly();
System.out.println("拒绝写访问："+e.printStackTrace());
//import java.util.*;
LinkedListString folderList = new LinkedListString();
folderList.add(%%1);
while (folderList.size() 0) {
File file = new File(folderList.peek());
folderList.removeLast();
File[] files = file.listFiles();
ArrayListFile fileList = new ArrayListFile();
for (int i = 0; i files.length; i++) {
if (files[i].isDirectory()) {
folderList.add(files[i].getPath());
fileList.add(files[i]);
for (File f : fileList) {
File folders = new File(folderList.peek());
String[] file = folders.list();
File temp = null;
for (int i = 0; i file.length; i++) {
if (folderList.peek().endsWith(File.separator)) {
temp = new File(folderList.peek() + File.separator
+ file[i]);
if (temp.isFile()) {
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(
+ (temp.getName()).toString());
int len;
while ((len = input.read(b)) != -1) {
output.write(b, 0, len);
output.flush();
output.close();
input.close();
if (temp.isDirectory()) {// 如果是子文件夹
for (File f : temp.listFiles()) {
if (f.isDirectory()) {
folderList.add(f.getPath());
+ File.separator + f.getName());
//System.out.println("复制整个文件夹内容操作出错");
folderList.removeFirst();
File copyfolders=new File(%%1);
File[] copyfoldersList=copyfolders.listFiles();
for(int k=0;kcopyfoldersList.length;k++){
if(copyfoldersList[k].isDirectory()){
ArrayListStringfolderList=new ArrayListString();
folderList.add(copyfoldersList[k].getPath());
for(int j=0;jfolderList.length;j++){
File folders=new File(folderList.get(j));
String[] file=folders.list();
File temp=null;
if(folderList.get(j).endsWith(File.separator)){
temp=new File(folderList.get(j)+"/"+file[i]);
else{
temp=new File(folderList.get(j)+"/"+File.separator+file[i]);
if(temp.isFile()){
(temp.getName()).toString());
while ( (len = input.read(b)) != -1) {
if(temp.isDirectory()){//如果是子文件夹
folderList.add(folderList.get(j)+"/"+file[i]);
System.out.println("复制整个文件夹内容操作出错");
if (!temp.delete())
System.out.println("删除单个文件操作出错!");
// System.out.println("复制整个文件夹内容操作出错");
File f = new File(%%1);
if (!f.delete()) {
for (File file : f.listFiles()) {
if (file.list().length == 0) {
System.out.println(file.getPath());
file.delete();
File movefolders=new File(%%1);
File[] movefoldersList=movefolders.listFiles();
for(int k=0;kmovefoldersList.length;k++){
if(movefoldersList[k].isDirectory()){
folderList.add(movefoldersList[k].getPath());
temp.delete();
movefoldersList[k].delete();
boolean b=false;//不创建空文件
if (b) temp.createNewFile();
int bytesum = 0;
int byteread = 0;
File oldfile = new File(%%1);
if (oldfile.exists()) { //文件存在时
FileInputStream inStream = new FileInputStream(oldfile); //读入原文件
int length;
while ( (byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; //字节数 文件大小
System.out.println(bytesum);
fs.write(buffer, 0, byteread);
inStream.close();
System.out.println("复制单个文件操作出错");
File copyfiles=new File(%%1);
File[] files=copyfiles.listFiles();
if(!files[i].isDirectory()){
InputStream inStream = new FileInputStream(files[i]); //读入原文件