Java擅长开发服务器端的程序
GUI-->Graph User Interface
图形用户接口，用图形的方式，来显示计算机操作的界面，
这样更方便更直观。
CLI-->Command line user Interface
命令行用户接口，就是常见的Dos命令操作，需要记忆一些
常用的命令，操作不直观。
用java Swing 和 JFrame写的界面记事本程序，十分简单，有打开文件，保存文件，退出程序的功能，事件的绑定是通过监听器实现的
1.png
当文件内容过多时，会自动出现滚动条
2.png
下面就是整个实现代码了
package day17;
import java.awt.FileDialog;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class MainFrame extends JFrame implements ActionListener{
public static void main(String[] args) {
MainFrame frame = new MainFrame();
}
private JTextArea textArea;
private JButton buttonSaveOther;
private JButton buttonCancel;
private JButton buttonSure;
private File nowFile;
private JMenuItem fileItem;
public MainFrame() {
initFrame();
this.setVisible(true);
}
//界面布局
public void initFrame() {
//创建窗口
this.setTitle("My title");
//设置窗口大小，位置，左上角是原点
this.setBounds(270, 80, 810, 640);
//设置JFrame的布局为null
this.setLayout(null);
Font font = new Font("宋体", Font.BOLD, 27);
textArea = new JTextArea();
textArea.setFont(font);
//滚动面板
JScrollPane pane = new JScrollPane(textArea);
pane.setBounds(30, 30, 750, 400);
this.add(pane);
buttonSaveOther = new JButton("另存为");
//设置按钮的位置(相对于所在容器的)，大小
buttonSaveOther.setBounds(75, 500, 120, 50);
buttonSaveOther.addActionListener(this);
this.add(buttonSaveOther);
buttonSure = new JButton("保存");
buttonSure.setBounds(345, 500, 120, 50);
buttonSure.addActionListener(this);
this.add(buttonSure);
buttonCancel = new JButton("退出");
buttonCancel.setBounds(615, 500, 120, 50);
buttonCancel.addActionListener(this);
this.add(buttonCancel);
//添加窗口事件处理程序，使用适配器
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.out.println("关闭窗口");
System.exit(-1);
}
});
//添加菜单栏
JMenuBar menuBar = new JMenuBar();
//添加菜单
JMenu menu = new JMenu("文件");
//添加菜单项
fileItem = new JMenuItem("打开");
fileItem.addActionListener(this);
menu.add(fileItem);
menu.addSeparator();
menuBar.add(menu);
this.setJMenuBar(menuBar);
}
//绑定监听事件
@Override
public void actionPerformed(ActionEvent e) {
Object event = e.getSource();
FileWriter writer = null;
FileReader reader = null;
if(buttonSaveOther == event) {
try {
System.out.println("另存为按钮");
FileDialog dialog = new FileDialog(this, "保存位置", FileDialog.SAVE);
dialog.setVisible(true);
nowFile = new File(dialog.getDirectory(), dialog.getFile());
System.out.println(dialog.getFile());
System.out.println(dialog.getDirectory());
writer = new FileWriter(nowFile);
writer.write(textArea.getText());
} catch (IOException e1) {
e1.printStackTrace();
} finally {
if(writer != null) {
try {
writer.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
System.out.println("关闭文件流");
}
}else if(buttonSure == event) {
System.out.println("保存按钮");
try {
writer = new FileWriter(nowFile);
writer.write(textArea.getText());
} catch (IOException e1) {
e1.printStackTrace();
} finally {
if(writer != null) {
try {
writer.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
System.out.println("关闭文件流");
}
}else if(buttonCancel == event) {
System.out.println("退出按钮");
this.dispose();
}else if(fileItem == event) {
System.out.println("打开文件按钮");
try {
FileDialog dialog = new FileDialog(this, "打开位置", FileDialog.LOAD);
dialog.setVisible(true);
nowFile = new File(dialog.getDirectory(), dialog.getFile());
System.out.println(dialog.getFile());
System.out.println(dialog.getDirectory());
reader = new FileReader(nowFile);
char[] c = new char[1024];
int len = -1;
String str = "";
while((len = reader.read(c)) != -1) {
str = str + new String(c, 0, len);
}
textArea.setText(str);
} catch (IOException e1) {
e1.printStackTrace();
} finally {
if(reader != null) {
try {
reader.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
System.out.println("关闭文件流");
}
}
}
}
一个多线程文件复制器
3.png
4.png
实现代码
下面这个就是整个UI界面的代码，对各个控件的排版和事件监听
package mulcopier;
import java.awt.FileDialog;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.JTextField;
public class CopyUI extends JFrame implements ActionListener{
private static final long serialVersionUID = 5521199214537722822L;
private JTextField textSrc;
private JTextField textAim;
private JTextField textNumberThread;
private JButton buttonStart;
private JButton buttonSrc;
private JButton buttonAim;
public JProgressBar bar;
public static void main(String[] args) {
CopyUI copyui = new CopyUI();
}
public CopyUI() {
init();
}
private void init() {
this.setTitle("多文件复制");
this.setBounds(270, 80, 800, 600);
this.setLayout(null);
Font fontText = new Font("宋体", Font.ITALIC, 20); --字体类
Font fontLab = new Font("宋体", Font.BOLD, 27);
JLabel labSrcPath = new JLabel("源文件"); --面板中label文字
labSrcPath.setFont(fontLab);
labSrcPath.setBounds(30, 30, 100, 60);
textSrc = new JTextField(); --所对应的输入框
textSrc.setFont(fontText);
textSrc.setBounds(150, 30, 400, 60);
buttonSrc = new JButton("打开源文件路径");
buttonSrc.setBounds(580, 40, 150, 40);
buttonSrc.addActionListener(this); --类本身实现了ActionListener接口，在对应方法中区分事件
this.add(labSrcPath); --添加至面板中
this.add(textSrc);
this.add(buttonSrc);
JLabel labAimPath = new JLabel("目标路径"); --跟上方类似
labAimPath.setFont(fontLab);
labAimPath.setBounds(20, 130, 150, 60);
textAim = new JTextField();
textAim.setFont(fontText);
textAim.setBounds(150, 130, 400, 60);
buttonAim = new JButton("打开目标文件路径");
buttonAim.setBounds(580, 140, 150, 40);
buttonAim.addActionListener(this);
this.add(labAimPath);
this.add(textAim);
this.add(buttonAim);
JLabel labNumberThread = new JLabel("线程数量");
labNumberThread.setFont(fontLab);
labNumberThread.setBounds(20, 230, 150, 60);
textNumberThread = new JTextField();
textNumberThread.setBounds(150, 230, 400, 60);
buttonStart = new JButton("开始");
buttonStart.setBounds(100, 350, 100, 40);
buttonStart.addActionListener(this);
this.add(labNumberThread);
this.add(textNumberThread);
this.add(buttonStart);
//添加窗口事件处理程序，使用适配器，监听窗口关闭事件，使得关闭的同时结束程序
//点击右上角的关闭按钮默认不会结束程序
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.out.println("关闭窗口");
System.exit(-1);
}
});
bar = new JProgressBar(); --进度条
bar.setBounds(50, 420, 700, 50);
this.add(bar);
this.setVisible(true); -- 设置面板可见
}
@Override
public void actionPerformed(ActionEvent e) { --区分并处理事件
if(e.getSource() == buttonStart) {
System.out.println("点击开始按钮");
String srcPath = textSrc.getText();
String aimPath = textAim.getText();
int count = Integer.parseInt(textNumberThread.getText());
System.out.println("源文件路径：" + srcPath + ", 目标文件路径：" + aimPath + ", 线程数：" + count);
Copier copier = new Copier(this, srcPath, aimPath, count);
copier.startCopy(); --这个类在下面可以看到
}else if(e.getSource() == buttonSrc){
--点击打开源文件路径按钮会弹出一个查找文件对话框，选择对应的文件后，所选的文件路径会出现在对应的输入框中
System.out.println("打开源文件路径");
FileDialog dialog = new FileDialog(this, "源文件路径", FileDialog.LOAD);
dialog.setVisible(true);
String srcPath = dialog.getDirectory() + dialog.getFile();
if(srcPath == "nullnull") {
textSrc.setText("");
}else {
textSrc.setText(srcPath);
}
System.out.println(srcPath);
}else if(e.getSource() == buttonAim){
System.out.println("打开目标文件路径");
FileDialog dialog = new FileDialog(this, "目标文件路径", FileDialog.LOAD);
dialog.setVisible(true);
String aimPath = dialog.getDirectory() + dialog.getFile();
if(aimPath == "nullnull") {
textAim.setText("");
}else {
textAim.setText(aimPath);
}
System.out.println(aimPath);
}
}
}
package mulcopier;
import java.io.File;
import java.io.RandomAccessFile;
import javax.swing.JProgressBar;
* 复制器
public class Copier {
private CopyUI copyui;
private String srcPath;
private String aimPath;
private int count;
public Copier(CopyUI copyui, String srcPath, String aimPath, int count) {
this.copyui = copyui;
this.srcPath = srcPath;
this.aimPath = aimPath;
this.count = count;
}
public void startCopy() {
File file = new File(srcPath);
int fileSize = (int) file.length();
System.out.println("文件大小" + fileSize);
copyui.bar.setMaximum(fileSize);
int average = fileSize/count;
int size = 0;
for(int i=0; i 0) {
len = rafSrc.read(buffer);
rafAim.write(buffer, 0, number);
bar.setValue(bar.getValue()+number);
synchronized (copyui) {
int value = copyui.bar.getValue();
copyui.bar.setValue(value + number);
}
System.out.println(Thread.currentThread().getName() + "开始位置：" + start + "，写入" + size + "完毕");
break;
}
// System.out.println("number = " + number + ", size = " + size);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if(rafSrc != null) {
rafSrc.close();
}
if(rafAim != null) {
rafAim.close();
}
} catch(Exception e) {
e.printStackTrace();
}
System.out.println("已关闭文件流");
}
}
}