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需求50句以上的JAVA代码，并带注解
Java文件操作大全
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1.创建文件夹
//import java.io.*;
File myFolderPath = new File(%%1);
try {
if (!myFolderPath.exists()) {
myFolderPath.mkdir();
}
}
catch (Exception e) {
System.out.println("新建目录操作出错");
e.printStackTrace();
}
2.创建文件
//import java.io.*;
File myFilePath = new File(%%1);
try {
if (!myFilePath.exists()) {
myFilePath.createNewFile();
}
FileWriter resultFile = new FileWriter(myFilePath);
PrintWriter myFile = new PrintWriter(resultFile);
myFile.println(%%2);
resultFile.close();
}
catch (Exception e) {
System.out.println("新建文件操作出错");
e.printStackTrace();
}
3.删除文件
//import java.io.*;
File myDelFile = new File(%%1);
try {
myDelFile.delete();
}
catch (Exception e) {
System.out.println("删除文件操作出错");
e.printStackTrace();
}
4.删除文件夹
//import java.io.*;
File delFolderPath = new File(%%1);
try {
delFolderPath.delete(); //删除空文件夹
}
catch (Exception e) {
System.out.println("删除文件夹操作出错");
e.printStackTrace();
}
5.删除一个文件下夹所有的文件夹
//import java.io.*;
File delfile=new File(%%1);
File[] files=delfile.listFiles();
for(int i=0;ifiles.length;i++){
if(files[i].isDirectory()){
files[i].delete();
}
}
6.清空文件夹
//import java.io.*;
File delfilefolder=new File(%%1);
try {
if (!delfilefolder.exists()) {
delfilefolder.delete();
}
delfilefolder.mkdir();
}
catch (Exception e) {
System.out.println("清空目录操作出错");
e.printStackTrace();
}
7.读取文件
//import java.io.*;
// 逐行读取数据
FileReader fr = new FileReader(%%1);
BufferedReader br = new BufferedReader(fr);
String %%2 = br.readLine();
while (%%2 != null) {
%%3
%%2 = br.readLine();
}
br.close();
fr.close();
8.写入文件
//import java.io.*;
// 将数据写入文件
try {
FileWriter fw = new FileWriter(%%1);
fw.write(%%2);
fw.flush();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
9.写入随机文件
//import java.io.*;
try {
RandomAcessFile logFile=new RandomAcessFile(%%1,"rw");
long lg=logFile.length();
logFile.seek(%%2);
logFile.writeByte(%%3);
}catch(IOException ioe){
System.out.println("无法写入文件："+ioe.getMessage());
}
10.读取文件属性
//import java.io.*;
// 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(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("文件的最后修改日期为：" + new Date(f.lastModified()));
}
if(f.canRead()){
%%2
}
if(f.canWrite()){
%%3
}
11.写入属性
//import java.io.*;
File filereadonly=new File(%%1);
try {
boolean b=filereadonly.setReadOnly();
}
catch (Exception e) {
System.out.println("拒绝写访问："+e.printStackTrace());
}
12.枚举一个文件夹中的所有文件
//import java.io.*;
//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());
} else {
fileList.add(files[i]);
}
}
for (File f : fileList) {
%%2=f.getAbsoluteFile();
%%3
}
}
13.复制文件夹
//import java.io.*;
//import java.util.*;
LinkedListString folderList = new LinkedListString();
folderList.add(%%1);
LinkedListString folderList2 = new LinkedListString();
folderList2.add(%%2+ %%1.substring(%%1.lastIndexOf("\\")));
while (folderList.size() 0) {
(new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹
File folders = new File(folderList.peek());
String[] file = folders.list();
File temp = null;
try {
for (int i = 0; i file.length; i++) {
if (folderList.peek().endsWith(File.separator)) {
temp = new File(folderList.peek() + File.separator
+ file[i]);
} else {
temp = new File(folderList.peek() + File.separator
+ file[i]);
}
if (temp.isFile()) {
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(
folderList2.peek() + File.separator
+ (temp.getName()).toString());
byte[] b = new byte[5120];
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());
folderList2.add(folderList2.peek()
+ File.separator + f.getName());
}
}
}
}
} catch (Exception e) {
//System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
folderList.removeFirst();
folderList2.removeFirst();
}
14.复制一个文件夹下所有的文件夹到另一个文件夹下
//import java.io.*;
//import java.util.*;
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());
ArrayListStringfolderList2=new ArrayListString();
folderList2.add(%%2+"/"+copyfoldersList[k].getName());
for(int j=0;jfolderList.length;j++){
(new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹
File folders=new File(folderList.get(j));
String[] file=folders.list();
File temp=null;
try {
for (int i = 0; i file.length; i++) {
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]);
}
FileInputStream input = new FileInputStream(temp);
if(temp.isFile()){
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" +
(temp.getName()).toString());
byte[] b = new byte[5120];
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
folderList.add(folderList.get(j)+"/"+file[i]);
folderList2.add(folderList2.get(j)+"/"+file[i]);
}
}
}
catch (Exception e) {
System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
}
}
}
15.移动文件夹
//import java.io.*;
//import java.util.*;
LinkedListString folderList = new LinkedListString();
folderList.add(%%1);
LinkedListString folderList2 = new LinkedListString();
folderList2.add(%%2 + %%1.substring(%%1.lastIndexOf("\\")));
while (folderList.size() 0) {
(new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹
File folders = new File(folderList.peek());
String[] file = folders.list();
File temp = null;
try {
for (int i = 0; i file.length; i++) {
if (folderList.peek().endsWith(File.separator)) {
temp = new File(folderList.peek() + File.separator
+ file[i]);
} else {
temp = new File(folderList.peek() + File.separator
+ file[i]);
}
if (temp.isFile()) {
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(
folderList2.peek() + File.separator
+ (temp.getName()).toString());
byte[] b = new byte[5120];
int len;
while ((len = input.read(b)) != -1) {
output.write(b, 0, len);
}
output.flush();
output.close();
input.close();
if (!temp.delete())
System.out.println("删除单个文件操作出错!");
}
if (temp.isDirectory()) {// 如果是子文件夹
for (File f : temp.listFiles()) {
if (f.isDirectory()) {
folderList.add(f.getPath());
folderList2.add(folderList2.peek()
+ File.separator + f.getName());
}
}
}
}
} catch (Exception e) {
// System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
folderList.removeFirst();
folderList2.removeFirst();
}
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();
}
}
}
16.移动一个文件夹下所有的文件夹到另一个目录下
//import java.io.*;
//import java.util.*;
File movefolders=new File(%%1);
File[] movefoldersList=movefolders.listFiles();
for(int k=0;kmovefoldersList.length;k++){
if(movefoldersList[k].isDirectory()){
ArrayListStringfolderList=new ArrayListString();
folderList.add(movefoldersList[k].getPath());
ArrayListStringfolderList2=new ArrayListString();
folderList2.add(%%2+"/"+movefoldersList[k].getName());
for(int j=0;jfolderList.length;j++){
(new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹
File folders=new File(folderList.get(j));
String[] file=folders.list();
File temp=null;
try {
for (int i = 0; i file.length; i++) {
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]);
}
FileInputStream input = new FileInputStream(temp);
if(temp.isFile()){
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" +
(temp.getName()).toString());
byte[] b = new byte[5120];
int len;
while ( (len = input.read(b)) != -1) {
output.write(b, 0, len);
}
output.flush();
output.close();
input.close();
temp.delete();
}
if(temp.isDirectory()){//如果是子文件夹
folderList.add(folderList.get(j)+"/"+file[i]);
folderList2.add(folderList2.get(j)+"/"+file[i]);
}
}
}
catch (Exception e) {
System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
}
movefoldersList[k].delete();
}
}
17.以一个文件夹的框架在另一个目录创建文件夹和空文件
//import java.io.*;
//import java.util.*;
boolean b=false;//不创建空文件
ArrayListStringfolderList=new ArrayListString();
folderList.add(%%1);
ArrayListStringfolderList2=new ArrayListString();
folderList2.add(%%2);
for(int j=0;jfolderList.length;j++){
(new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹
File folders=new File(folderList.get(j));
String[] file=folders.list();
File temp=null;
try {
for (int i = 0; i file.length; i++) {
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]);
}
FileInputStream input = new FileInputStream(temp);
if(temp.isFile()){
if (b) temp.createNewFile();
}
if(temp.isDirectory()){//如果是子文件夹
folderList.add(folderList.get(j)+"/"+file[i]);
folderList2.add(folderList2.get(j)+"/"+file[i]);
}
}
}
catch (Exception e) {
System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
}
18.复制文件
//import java.io.*;
int bytesum = 0;
int byteread = 0;
File oldfile = new File(%%1);
try {
if (oldfile.exists()) { //文件存在时
FileInputStream inStream = new FileInputStream(oldfile); //读入原文件
FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));
byte[] buffer = new byte[5120];
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();
}
}
catch (Exception e) {
System.out.println("复制单个文件操作出错");
e.printStackTrace();
}
19.复制一个文件夹下所有的文件到另一个目录
//import java.io.*;
File copyfiles=new File(%%1);
File[] files=copyfiles.listFiles();
for(int i=0;ifiles.length;i++){
if(!files[i].isDirectory()){
int bytesum = 0;
int byteread = 0;
try {
InputStream inStream = new FileInputStream(files[i]); //读入原文件
FileOutputStream fs = new FileOutputStream(new File(%%2,files[i].getName());
byte[] buffer = new byte[5120];
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();
} catch (Exception e) {
System.out.println("复制单个文件操作出错");
e.printStackTrace();
}
}
}
20.提取扩展名
String %%2=%%1.substring(%%1.lastIndexOf(".")+1);
用java写一个窗口
import java.awt.BorderLayout;
import java.awt.Toolkit;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class MyFrame extends JFrame {
private JLabel lab_name;
private JLabel lab_number;
private JLabel lab_amount;
private JTextField jtf_name;
private JTextField jtf_number;
private JTextField jtf_amount;
private JButton but_1;
private JButton but_2;
private JButton but_3;
public MyFrame(){
setSize(245, 260);
setTitle("JLabel Demo");
Toolkit tk = Toolkit.getDefaultToolkit();
setLocation((tk.getScreenSize().height - this.HEIGHT)/2,
(tk.getScreenSize().width - this.WIDTH)/2);
this.setLayout(null);
lab_name = new JLabel("姓名");
lab_number = new JLabel("学号");
lab_amount = new JLabel("金额");
jtf_name = new JTextField(13);
jtf_number = new JTextField(13);
jtf_amount = new JTextField(13);
JPanel jp_top = new JPanel();
jp_top.setBounds(0, 20, 245, 100);
jp_top.setLayout(new BorderLayout());
JPanel jp_top_name = new JPanel();
JPanel jp_top_number = new JPanel();
JPanel jp_top_amount = new JPanel();
jp_top_name.add(lab_name);
jp_top_name.add(jtf_name);
jp_top_number.add(lab_number);
jp_top_number.add(jtf_number);
jp_top_amount.add(lab_amount);
jp_top_amount.add(jtf_amount);
jp_top.add(jp_top_name,BorderLayout.NORTH);
jp_top.add(jp_top_number,BorderLayout.CENTER);
jp_top.add(jp_top_amount,BorderLayout.SOUTH);
JPanel jp_bottom = new JPanel();
jp_bottom.setBounds(0,150, 245, 90);
but_1 = new JButton("提交");
but_2 = new JButton("取消");
but_3 = new JButton("重写");
jp_bottom.add(but_1);
jp_bottom.add(but_2);
jp_bottom.add(but_3);
this.add(jp_top,BorderLayout.NORTH);
this.add(jp_bottom,BorderLayout.CENTER);
setVisible(true);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyFrame();
}
}
LZ看下合适不。。。按钮想要美化的话 到网上再搜下。。。美化我不在行。。。
java程序关闭窗口代码
import java.applet.*;
import java.awt.Color;
import java.awt.Frame;
import javax.swing.JFrame;
import java.awt.event.*;
public class FirstFrame extends Frame {
public static void main(String args[]) {
FirstFrame fr = new FirstFrame("First contianer!");
fr.setSize(240, 240);
//继承JFrame的关闭窗口代码
//fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//继承Frame的
fr.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);//退出系统
}
});
fr.setVisible(true);
}
public FirstFrame(String str) {
super(str);
}
}
急需一个java编程实现的简单聊天窗口代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
public class ClientDemo01 {
public static void main(String[] args){
JFrame f=new JFrame("AA");
JPanel p1=new JPanel();
JPanel p2=new JPanel();
JTextArea ta=new JTextArea(15,30);
ta.setEditable(false); //文本域只读
JScrollPane sp=new JScrollPane(ta); //滚动窗格
JTextField tf=new JTextField(20);
JButton b=new JButton("发送");
p1.add(sp);
p2.add(tf);
p2.add(b);
f.add(p1,"Center");
f.add(p2,"South");
f.setBounds(300,300,360,300);
f.setVisible(true);
f.setResizable(false);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Socket socket=null;
BufferedInputStream bis=null;
BufferedOutputStream bos=null;
try{
socket=new Socket("192.168.0.4",5000);
bis=new BufferedInputStream(socket.getInputStream());
bos=new BufferedOutputStream(socket.getOutputStream());
MyThread01 mt=new MyThread01(bis,ta);
mt.start();
}catch(Exception e){
e.printStackTrace();
}
b.addActionListener(new ButtonActionListener01(tf,ta,bos));
}
}
class ButtonActionListener01 implements ActionListener{
JTextField tf;
JTextArea ta;
BufferedOutputStream bos;
public ButtonActionListener01(JTextField tf,JTextArea ta,BufferedOutputStream bos){
this.tf=tf;
this.ta=ta;
this.bos=bos;
}
public void actionPerformed(ActionEvent e){
String message=tf.getText();
if(!message.equals("")){
tf.setText(""); //清空文本框
ta.append("AA:"+message+"\n"); //添加到文本域并换行
try{
bos.write(message.getBytes());
bos.flush();
}catch(Exception ex){
System.out.println("发送失败");
}
}
}
}
class MyThread01 extends Thread{
BufferedInputStream bis;
JTextArea ta;
public MyThread01(BufferedInputStream bis,JTextArea ta){
this.bis=bis;
this.ta=ta;
}
public void run(){
try{
while(true){
byte[] b=new byte[100];
int length=bis.read(b);
String message=new String(b,0,length);
ta.append("BB:"+message+"\n");
}
}catch(Exception e){
e.printStackTrace();
}
}
} import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
public class ServerDemo01{
public static void main(String[] args){
JFrame f=new JFrame("BB");
JPanel p1=new JPanel();
JPanel p2=new JPanel();
JTextArea ta=new JTextArea(12,30); //文本域，第一个参数为行数，第二个参数为列数
ta.setEditable(false); //文本域只读
JScrollPane sp=new JScrollPane(ta); //滚动窗格
JTextField tf=new JTextField(20);
JButton b=new JButton("发送");
p1.add(sp);
p2.add(tf);
p2.add(b);
f.add(p1,"Center");
f.add(p2,"South");
f.setBounds(300,300,360,300);
f.setVisible(true);
f.setResizable(false);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ServerSocket server=null;
Socket socket=null;
BufferedInputStream bis=null;
BufferedOutputStream bos=null;
try{
server=new ServerSocket(5000);
//ta.append("等待AA连接...\n");
socket=server.accept();
//ta.append("AA已连接\n");
bis=new BufferedInputStream(socket.getInputStream());
bos=new BufferedOutputStream(socket.getOutputStream());
MyThread1 mt=new MyThread1(bis,ta);
mt.start();
}catch(Exception e){
e.printStackTrace();
}
b.addActionListener(new ButtonActionListener1(tf,ta,bos));
}
}
class ButtonActionListener1 implements ActionListener{
JTextField tf;
JTextArea ta;
BufferedOutputStream bos;
public ButtonActionListener1(JTextField tf,JTextArea ta,BufferedOutputStream bos){
this.tf=tf;
this.ta=ta;
this.bos=bos;
}
public void actionPerformed(ActionEvent e){
String message=tf.getText(); //获取文本框中的内容
if(!message.equals("")){
tf.setText(""); //清空文本框
ta.append("BB:"+message+"\n"); //添加到文本域并换行
try{
bos.write(message.getBytes());
bos.flush();
}catch(Exception ex){
System.out.println("发送失败！");
}
}
}
}
class MyThread1 extends Thread{
BufferedInputStream bis;
JTextArea ta;
public MyThread1(BufferedInputStream bis,JTextArea ta){
this.bis=bis;
this.ta=ta;
}
public void run(){
try{
while(true){
byte[] b=new byte[100];
int length=bis.read(b);
String message=new String(b,0,length);
ta.append("AA:"+message+"\n");
}
}catch(Exception e){
e.printStackTrace();
}
}
}
给段最简单的java代码 让我新手看一下
最简单的java代码肯定就是这个了，如下：
public class MyFirstApp
{
public static void main(String[] args)
{
System.out.print("Hello world");
}
}
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文章名称：java编程窗口代码大全,Java窗口代码
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