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

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);
}
}
}