将整个目录内容复制到另一个目录?

时间:2011-06-02 12:48:11

标签: java grails file-io groovy

将整个目录内容复制到java或groovy中的另一个目录的方法?

10 个答案:

答案 0 :(得分:78)

FileUtils.copyDirectory()

  

复制整个目录   到保留文件的新位置   日期。这个方法复制了   指定目录及其所有子项   指定的目录和文件   目的地。目的地是   新的位置和名称   。目录

     

创建目标目录   如果它不存在。如果   目标目录确实存在,然后   此方法合并源与   目的地,来源   优先级。

为此,这是示例代码

String source = "C:/your/source";
File srcDir = new File(source);

String destination = "C:/your/destination";
File destDir = new File(destination);

try {
    FileUtils.copyDirectory(srcDir, destDir);
} catch (IOException e) {
    e.printStackTrace();
}

答案 1 :(得分:30)

以下是使用JDK7的示例。

public class CopyFileVisitor extends SimpleFileVisitor<Path> {
    private final Path targetPath;
    private Path sourcePath = null;
    public CopyFileVisitor(Path targetPath) {
        this.targetPath = targetPath;
    }

    @Override
    public FileVisitResult preVisitDirectory(final Path dir,
    final BasicFileAttributes attrs) throws IOException {
        if (sourcePath == null) {
            sourcePath = dir;
        } else {
        Files.createDirectories(targetPath.resolve(sourcePath
                    .relativize(dir)));
        }
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFile(final Path file,
    final BasicFileAttributes attrs) throws IOException {
    Files.copy(file,
        targetPath.resolve(sourcePath.relativize(file)));
    return FileVisitResult.CONTINUE;
    }
}

要使用访客,请执行以下操作

Files.walkFileTree(sourcePath, new CopyFileVisitor(targetPath));

如果您只想内联所有内容(如果经常使用它,效率不高,但对于快速使用有效)

    final Path targetPath = // target
    final Path sourcePath = // source
    Files.walkFileTree(sourcePath, new SimpleFileVisitor<Path>() {
        @Override
        public FileVisitResult preVisitDirectory(final Path dir,
                final BasicFileAttributes attrs) throws IOException {
            Files.createDirectories(targetPath.resolve(sourcePath
                    .relativize(dir)));
            return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult visitFile(final Path file,
                final BasicFileAttributes attrs) throws IOException {
            Files.copy(file,
                    targetPath.resolve(sourcePath.relativize(file)));
            return FileVisitResult.CONTINUE;
        }
    });

答案 2 :(得分:14)

使用Groovy,您可以leverage Ant来执行:

new AntBuilder().copy( todir:'/path/to/destination/folder' ) {
  fileset( dir:'/path/to/src/folder' )
}

AntBuilder是发行版和自动导入列表的一部分,这意味着它可以直接用于任何groovy代码。

答案 3 :(得分:9)

public static void copyFolder(File source, File destination)
{
    if (source.isDirectory())
    {
        if (!destination.exists())
        {
            destination.mkdirs();
        }

        String files[] = source.list();

        for (String file : files)
        {
            File srcFile = new File(source, file);
            File destFile = new File(destination, file);

            copyFolder(srcFile, destFile);
        }
    }
    else
    {
        InputStream in = null;
        OutputStream out = null;

        try
        {
            in = new FileInputStream(source);
            out = new FileOutputStream(destination);

            byte[] buffer = new byte[1024];

            int length;
            while ((length = in.read(buffer)) > 0)
            {
                out.write(buffer, 0, length);
            }
        }
        catch (Exception e)
        {
            try
            {
                in.close();
            }
            catch (IOException e1)
            {
                e1.printStackTrace();
            }

            try
            {
                out.close();
            }
            catch (IOException e1)
            {
                e1.printStackTrace();
            }
        }
    }
}

答案 4 :(得分:5)

答案 5 :(得分:3)

FileUtils.copyDirectory()Archimedes's answer都没有复制目录属性(文件所有者,权限,修改时间等)。

https://stackoverflow.com/a/18691793/14731提供了一个完整的JDK7解决方案。

答案 6 :(得分:3)

这是我的Groovy代码。测试。

private static void copyLargeDir(File dirFrom, File dirTo){
    // creation the target dir
    if (!dirTo.exists()){
        dirTo.mkdir();
    }
    // copying the daughter files
    dirFrom.eachFile(FILES){File source ->
        File target = new File(dirTo,source.getName());
        target.bytes = source.bytes;
    }
    // copying the daughter dirs - recursion
    dirFrom.eachFile(DIRECTORIES){File source ->
        File target = new File(dirTo,source.getName());
        copyLargeDir(source, target)
    }
}

答案 7 :(得分:2)

随着Java NIO的推出,以下是一个可能的解决方案

使用Java 9:

private static void copyDir(String src, String dest, boolean overwrite) {
    try {
        Files.walk(Paths.get(src)).forEach(a -> {
            Path b = Paths.get(dest, a.toString().substring(src.length()));
            try {
                if (!a.toString().equals(src))
                    Files.copy(a, b, overwrite ? new CopyOption[]{StandardCopyOption.REPLACE_EXISTING} : new CopyOption[]{});
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
    } catch (IOException e) {
        //permission issue
        e.printStackTrace();
    }
}

使用Java 7:

import java.io.IOException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.function.Consumer;
import java.util.stream.Stream;

public class Test {

    public static void main(String[] args) {
        Path sourceParentFolder = Paths.get("/sourceParent");
        Path destinationParentFolder = Paths.get("/destination/");

        try {
            Stream<Path> allFilesPathStream = Files.walk(sourceParentFolder);
            Consumer<? super Path> action = new Consumer<Path>(){

                @Override
                public void accept(Path t) {
                    try {
                        String destinationPath = t.toString().replaceAll(sourceParentFolder.toString(), destinationParentFolder.toString());
                        Files.copy(t, Paths.get(destinationPath));
                    } 
                    catch(FileAlreadyExistsException e){
                        //TODO do acc to business needs
                    }
                    catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }

            };
            allFilesPathStream.forEach(action );

        } catch(FileAlreadyExistsException e) {
            //file already exists and unable to copy
        } catch (IOException e) {
            //permission issue
            e.printStackTrace();
        }

    }

}

答案 8 :(得分:0)

关于 Java ,标准API中没有这样的方法。在Java 7中,java.nio.file.Files类将提供copy便捷方法。

<强>参考

  1. The Java Tutorials

  2. Copying files from one directory to another in Java

答案 9 :(得分:0)

如果您愿意使用第三方库,请查看javaxt-core。 javaxt.io.Directory类可用于复制如下目录:

javaxt.io.Directory input = new javaxt.io.Directory("/source");
javaxt.io.Directory output = new javaxt.io.Directory("/destination");
input.copyTo(output, true); //true to overwrite any existing files

您还可以提供文件过滤器以指定要复制的文件。这里有更多的例子:

http://javaxt.com/javaxt-core/io/Directory/Directory_Copy