Java 8：递归复制目录？ [英] Java 8: Copy directory recursively?

问题描述

我看到Java 8已经大大清理了将文件内容读入字符串：

I see that Java 8 has significantly cleaned up reading the contents of a file into a String:

String contents = new String(Files.readAllBytes(Paths.get(new URI(someUrl))));

我想知道是否有类似的东西（更干净/更少的代码/更简洁）递归复制目录。在Java 7中，它仍然是这样的：

I am wondering if there is something similar (cleaner/less code/more concise) for copying directories recursively. In Java 7 land, it's still something like:

public void copyFolder(File src, File dest) throws IOException{
    if(src.isDirectory()){
        if(!dest.exists()){
            dest.mkdir();
        }

        String files[] = src.list();

        for (String file : files) {
            File srcFile = new File(src, file);
            File destFile = new File(dest, file);

            copyFolder(srcFile,destFile);
        }

    } else {
        InputStream in = new FileInputStream(src);
        OutputStream out = new FileOutputStream(dest); 

        byte[] buffer = new byte[1024];

        int length;
        while ((length = in.read(buffer)) > 0){
            out.write(buffer, 0, length);
        }

        in.close();
        out.close();
    }
}

Java 8中的任何改进？

Any improvements here in Java 8?

推荐答案

以下代码怎么样

public void copyFolder(File src, File dest) throws IOException {
        try (Stream<Path> stream = Files.walk(src.toPath())) {
            stream.forEachOrdered(sourcePath -> {

                try {
                    Files.copy(
                            /*Source Path*/
                            sourcePath,
                            /*Destination Path */
                            src.toPath().resolve(dest.toPath().relativize(sourcePath)));
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            });
        }
    }

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