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("\n" + path + " directory created.");
         } catch (IOException e) {
             System.out.println("\nDirectory creation failed:\n" + 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:\n" + 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);
         }
     }
 }