信息安全恢复

对某一文件进行恢复（Task1）
代码：
`package Task1;

import java.awt.Button;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.xml.stream.events.StartDocument;

public class Task1 extends JFrame{
static JTextField tf1 = new JTextField();
static JTextField tf2 = new JTextField();

public Task1(String title){    super(title);    setLayout(null);    JFrame jFrame = new JFrame("文件恢复");    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    setLocation(300,300);    setSize(500, 400);    Button button1 = new Button("选择待恢复文件");    button1.setBounds(new Rectangle(20, 20, 120, 25));    button1.addActionListener(new ChoosePartition());    Button button2 = new Button("选择恢复文件位置");    button2.setBounds(new Rectangle(20, 100, 120, 25));    button2.addActionListener(new ChooseLocota());    Button button3 = new Button("恢复文件");    button3.setBounds(new Rectangle(200, 200, 80, 25));    button3.addActionListener(new CopyFile());    tf1.setBounds(new Rectangle(150, 20, 250, 25));    tf2.setBounds(new Rectangle(150, 100, 250, 25));    add(button1);    add(button2);    add(button3);    add(tf1);    add(tf2);    setVisible(true);}public static void main(String[] args) {    Task1 t = new Task1("文件恢复");}

}

class ChoosePartition implements ActionListener{
public void actionPerformed(ActionEvent e) {
JFileChooser jf = new JFileChooser();
jf.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
jf.showOpenDialog(null);
File file = jf.getSelectedFile();
if(file != null){
Task1.tf1.setText(file.getAbsolutePath());
}
}
}

class ChooseLocota implements ActionListener{

@Overridepublic void actionPerformed(ActionEvent e) {    JFileChooser JF = new JFileChooser();    JF.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);    JF.showOpenDialog(null);    File file1 = JF.getSelectedFile();    if(file1 != null){        Task1.tf2.setText(file1.getAbsolutePath());    }}

}

class CopyFile implements ActionListener{

@Overridepublic void actionPerformed(ActionEvent e) {     String str1 = Task1.tf1.getText();     String str2 = Task1.tf2.getText();     File file1 = new File(str1);     File file2 = new File(str2);     if(file1.isFile()){         CopyFile(str1,str2);     }    if(file1.isDirectory() && file2.isDirectory()){         CopyDir(str1, str2);    }}public static boolean CopyFile(String srcPath , String destDir) {    boolean flag = false;    try {        File srcFile = new File(srcPath);        if(!srcFile.exists()){            JOptionPane.showMessageDialog(null, "文件不存在！");        }        File destFile = new File(destDir);        destFile.mkdirs();        if(!destFile.exists()){            JOptionPane.showMessageDialog(null, "文件目录不存在！");        }        String filename = srcPath.substring(srcPath.lastIndexOf(File.separator));        String destPath = destDir + filename;        File destFile1 = new File(destPath);        if(srcPath.equals(destPath)){            JOptionPane.showMessageDialog(null, "源路径和目标路径重复！");            return false;        }        if(destFile1.exists() && destFile1.isFile()){            JOptionPane.showMessageDialog(null, "目标路径下已有同名文件！");            return false;        }        FileInputStream in = new FileInputStream(srcPath);        FileOutputStream out = new FileOutputStream(destFile1);        byte[] buffer = new byte[1024];        int ins;        long start = System.currentTimeMillis();        while((ins = in.read(buffer)) != -1){            out.write(buffer, 0, ins);        }        out.flush();        in.close();        out.close();        long end = System.currentTimeMillis();        flag = true;        long time = end - start;        if(flag){            JOptionPane.showMessageDialog(null, "文件恢复成功！共恢复1份文件到"+destDir                    +'\n'+"耗时"+time+"ms");        }    } catch (FileNotFoundException e1) {        e1.printStackTrace();    } catch (IOException e1) {        e1.printStackTrace();    }        return flag;}public static boolean CopyDir(String srcPath , String destPath){    boolean flag = false;    File srcFile = new File(srcPath);    if(!srcFile.exists()){        JOptionPane.showMessageDialog(null, "文件夹不存在！");    }    String dirName = getDirName(srcPath);    String destDir = destPath + File.separator+dirName;    File[] fileList = srcFile.listFiles();    if(fileList.length == 0) {        flag = true;    }else {        //long start = System.currentTimeMillis();        for (File temp : fileList) {            if(temp.isFile()){                flag = CopyFile(temp.getAbsolutePath(),destDir);            }else if(temp.isDirectory()){                flag = CopyDir(temp.getAbsolutePath(), destDir);            }            //long end = System.currentTimeMillis();            //long time = end - start;            if(!flag)   {                break;            }        }    }    if(flag){        JOptionPane.showMessageDialog(null, "恢复结束！"+"共恢复"+fileList.length+"份文件到"+destPath);    }    return flag;}private static String getDirName(String dir) {      if (dir.endsWith(File.separator)) { // 如果文件夹路径以"//"结尾，则先去除末尾的"//"          dir = dir.substring(0, dir.lastIndexOf(File.separator));      }      return dir.substring(dir.lastIndexOf(File.separator) + 1);      }}

`