Java基础之访问文件与目录——移动或复制文件和目录（MoveAndCopyFiles）

控制台程序，创建和删除目录以及复制和移动文件。

import java.nio.file.*;
import java.nio.file.attribute.*;
import java.io.IOException;

public class MoveAndCopyFiles {
    static void createSingleDirectory(Path path){
        try{
            Files.createDirectories(path);
            System.out.println("
" + path + " directory created.");
        } catch (IOException e) {
            System.out.println("
Directory creation failed:
" + e);
        }
    }

    static boolean isDirectory(Path path) {
        try{
            BasicFileAttributes attr =Files.readAttributes(path,BasicFileAttributes.class);
            return attr.isDirectory();
        } catch (IOException e) {
            System.err.println("I/O error in isDirectory method. " + e);
        }
        return false;
    }

    static boolean copyFiles(Path from, Path to) {
        if(!isDirectory(from)) {
            System.out.println("Cannot copy files. " + from + " is not a directory.");
            return false;
        }
        if(!isDirectory(to)) {
            System.out.println("Cannot copy files. " + to + " is not a directory.");
            return false;
        }
        
        try (DirectoryStream<Path> files =Files.newDirectoryStream(from, "*.*")) {
            System.out.println("Starting copy...");
            for(Path file : files) {
                Files.copy(file, to.resolve(file.getFileName()));
                System.out.println("  " + file.getFileName() + " copied.");
            }
        } catch (IOException e) {
            System.err.println("I/O error in copyFiles. " + e);
            return false;
        }
        return true;
    }

    static boolean moveFiles(Path from, Path to) {
        if(!isDirectory(from)) {
            System.out.println("Cannot move files. " + from + " is not a directory.");
            return false;
        }
        if(!isDirectory(to)) {
            System.out.println("Cannot move files. " + to + " is not a directory.");
            return false;
        }
        
        try (DirectoryStream<Path> files =Files.newDirectoryStream(from, "*.*")) {
            System.out.println("Starting move...");
            for(Path file : files) {
                Files.move(file, to.resolve(file.getFileName()));
                System.out.println("  " + file.getFileName() + " moved.");
            }
        } catch (IOException e) {
            System.err.println("I/O error in copyFiles. " + e);
            return false;
        }
        return true;
    }

    static void waitForEnter() {
        try {
            System.out.println("waiting...");
            System.in.read();
        }catch(IOException e) {
            System.err.println(e);
        }
    }

    public static void main(String[] args) {
        Path current =Paths.get("E:/JavaProject/BeginningJava/Ch9_Directories/MoveAndCopyFiles");
        Path newDir =Paths.get("junkDir");
        newDir=newDir.toAbsolutePath();
        createSingleDirectory(newDir);
        
        System.out.println("Copying files from " + current + " to " + newDir);
        if(!copyFiles(current,newDir)) {
            System.out.println("Copying files failed.");
            return;
        }
        System.out.println("You can look at the directory to verify that the copy has worked.");
        System.out.println("Press Enter to continue.");
        waitForEnter();
        
        Path newDir2 =Paths.get("junkDirBackup");
        newDir2=newDir2.toAbsolutePath();
        createSingleDirectory(newDir2);
        
        System.out.println("Moving files from " + newDir + " to " + newDir2);
        if(!moveFiles(newDir,newDir2)) {
            System.out.println("Moving files failed.");
            return;
        }
        
        System.out.println("You can look at the directory to verify that the move has worked.");
        System.out.println("Press Enter to continue.");
        waitForEnter();
        
        try {
            System.out.println("Deleting " + newDir + "...");
            Files.delete(newDir);
        }catch(IOException e) {
            System.err.println("Deleting " + newDir + " failed:
" + e);
        }
        
        try (DirectoryStream<Path> files =Files.newDirectoryStream(newDir2, "*.*")) {
            System.out.println("Deleting files from " + newDir2 + "...");
            for(Path file:files) {
                Files.delete(file);
                System.out.println(" " + file.getFileName() + " deleted.");
            }
            System.out.println("Deleting " + newDir2 + "...");
            Files.delete(newDir2);
        } catch (IOException e) {
            System.err.println("I/O error deleting files. " + e);
        }
    }
}