移动文件分为两个步骤,先拷贝文件,再删除源文件。
下面的代码将会把 C:\rafaelnadal 目录中的内容移动到 C:\ATP\players\rafaelnafal 目录中。在移动前,要确保 C:\ATP\players\rafaelnafal 目录已经存在。在这个
例子中,目录的移动使用了 Files.copy() 和 Files.delete() 方法,文件的移动使用了 Files.move() 方法。
class="java" name="code">import java.io.IOException;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.util.EnumSet;
import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
import static java.nio.file.StandardCopyOption.COPY_ATTRIBUTES;
import static java.nio.file.StandardCopyOption.ATOMIC_MOVE;
class MoveTree implements FileVisitor {
private final Path moveFrom;
private final Path moveTo;
static FileTime time = null;
public MoveTree(Path moveFrom, Path moveTo) {
this.moveFrom = moveFrom;
this.moveTo = moveTo;
}
static void moveSubTree(Path moveFrom, Path moveTo) throws IOException {
try {
Files.move(moveFrom, moveTo, REPLACE_EXISTING, ATOMIC_MOVE);
} catch (IOException e) {
System.err.println("Unable to move " + moveFrom + " [" + e + "]");
}
}
@Override
public FileVisitResult postVisitDirectory(Object dir, IOException exc)
throws IOException {
Path newdir = moveTo.resolve(moveFrom.relativize((Path) dir));
try {
Files.setLastModifiedTime(newdir, time);
Files.delete((Path) dir);
} catch (IOException e) {
System.err.println("Unable to copy all attributes to: " + newdir+" [" + e + "]");
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult preVisitDirectory(Object dir, BasicFileAttributes attrs)
throws IOException {
System.out.println("Move directory: " + (Path) dir);
Path newdir = moveTo.resolve(moveFrom.relativize((Path) dir));
try {
Files.copy((Path) dir, newdir, REPLACE_EXISTING, COPY_ATTRIBUTES);
time = Files.getLastModifiedTime((Path) dir);
} catch (IOException e) {
System.err.println("Unable to move " + newdir + " [" + e + "]");
return FileVisitResult.SKIP_SUBTREE;
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Object file, BasicFileAttributes attrs)
throws IOException {
System.out.println("Move file: " + (Path) file);
moveSubTree((Path) file, moveTo.resolve(moveFrom.relativize((Path) file)));
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Object file, IOException exc)
throws IOException {
return FileVisitResult.CONTINUE;
}
}
class Main {
public static void main(String[] args) throws IOException {
Path moveFrom = Paths.get("C:/rafaelnadal");
Path moveTo = Paths.get("C:/ATP/players/rafaelnadal");
MoveTree walk = new MoveTree(moveFrom, moveTo);
EnumSet opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);
Files.walkFileTree(moveFrom, opts, Integer.MAX_VALUE, walk);
}
}
当然,也可以不使用 Files.move() 方法,而使用 Files.copy()
和 Files.delete() 方法来移动文件:
static void moveSubTree(Path moveFrom, Path moveTo) throws IOException {
try {
Files.copy(moveFrom, moveTo, REPLACE_EXISTING, COPY_ATTRIBUTES);
Files.delete(moveFrom);
} catch (IOException e) {
System.err.println("Unable to move " + moveFrom + " [" + e + "]");
}
}
文章来源:http://www.aptusource.org/2014/04/nio-2-writing-a-move-
files-application/