JAVA程序设计(17)----- 制作文件拷贝软件 进程 输入流输出流 NIO 进度条 底层拷贝 多线程

使用NIO对文件进行底层拷贝（按照字节）多线程技术初级应用 不阻塞程序运行

package com.lovo.homework01;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JProgressBar;import javax.swing.JTextField;/** * 类：文件拷贝 * @author Abe * NIO应用，JProgressBar应用 */@SuppressWarnings("serial")public class NIOTest extends JFrame {private JProgressBar jbar = null;private int totleSize = 0;private int copyedSize = 0;private int eachSize = 0;private JButton startButton = null;private JTextField inField = null, outField = null;/** * 构造器 */public NIOTest() {this.setSize(400, 300);this.setResizable(false);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setLocationRelativeTo(null);this.setLayout(null);/** * JProgressBar设置 */jbar = new JProgressBar();jbar.setMinimum(0);jbar.setMaximum(100);//显示上下限jbar.setValue(0);//初始值jbar.setStringPainted(true);//显示百分比jbar.setBounds(50, 150, 300, 30);/** * 文字输入框 */inField = new JTextField();inField.setBounds(50, 50, 300, 30);outField = new JTextField();outField.setBounds(50, 100, 300, 30);/** * 拷贝开始按钮 */startButton = new JButton("开始拷贝");startButton.setBounds(150, 200, 100, 30);/** * 按钮加监听器，匿名内部类就地实例化 */startButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {startButton.setEnabled(false);/** * 多线程技术 新建一个线程 就地实例化Runnable接口 */new Thread(new Runnable() {@Overridepublic void run() {//新建输入输出流 这里用Filexxxxxx 是因为NIO的方法他们才能用FileInputStream in = null;FileOutputStream out = null;try {in = new FileInputStream(inField.getText());out = new FileOutputStream(outField.getText());//NIO 专属 传输通道FileChannel fcin = in.getChannel();FileChannel fout = out.getChannel();totleSize = in.available();//NIO 专属 运输小车ByteBuffer buffer = ByteBuffer.allocate(4096);while ((eachSize = fcin.read(buffer)) != -1) {//指针回零 然后开始读取数据 直到内容末尾buffer.flip();fout.write(buffer);//清空小车buffer.clear();//设置 进度条显示内容copyedSize += eachSize;jbar.setValue((int) (100.0 * copyedSize / totleSize));}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {//关闭输入和输出流if (in != null) {try {in.close();} catch (IOException e) {e.printStackTrace();}}if (out != null) {try {out.close();} catch (IOException e) {e.printStackTrace();}}}}}).start();//千万不要忘了 新建的线程 用这个开始运行}});this.add(inField);this.add(outField);this.add(startButton);this.add(jbar);}/** * main方法 设置窗口可见 * @param args */public static void main(String[] args) {new NIOTest().setVisible(true);}}