没有Commons IO和< Java SE 7

public static void deleteRecursive(File path){
            path.listFiles(new FileFilter() {
                @Override
                public boolean accept(File pathname) {
                    if (pathname.isDirectory()) {
                        pathname.listFiles(this);
                        pathname.delete();
                    } else {
                        pathname.delete();
                    }
                    return false;
                }
            });
            path.delete();
        }

在Java 7中，我们终于可以通过可靠的符号链接检测来做到这一点。(我不认为Apache的commons-io现在有可靠的符号链接检测，因为它不处理Windows上用mklink创建的链接。)

出于历史原因，这里有一个java 7之前的答案，它遵循符号链接。

void delete(File f) throws IOException {
  if (f.isDirectory()) {
    for (File c : f.listFiles())
      delete(c);
  }
  if (!f.delete())
    throw new FileNotFoundException("Failed to delete file: " + f);
}

public void deleteRecursive(File path){
    File[] c = path.listFiles();
    System.out.println("Cleaning out folder:" + path.toString());
    for (File file : c){
        if (file.isDirectory()){
            System.out.println("Deleting file:" + file.toString());
            deleteRecursive(file);
            file.delete();
        } else {
            file.delete();
        }
    }
    path.delete();
}

public static void deleteDirectory(File path) 
{
    if (path == null)
        return;
    if (path.exists())
    {
        for(File f : path.listFiles())
        {
            if(f.isDirectory()) 
            {
                deleteDirectory(f);
                f.delete();
            }
            else
            {
                f.delete();
            }
        }
        path.delete();
    }
}

rm -rf的性能比FileUtils.deleteDirectory要好得多。

经过大量的基准测试后，我们发现使用rm -rf比使用FileUtils.deleteDirectory快几倍。

当然，如果您有一个小的或简单的目录，这并不重要，但在我们的例子中，我们有多个gb和深度嵌套的子目录，使用FileUtils.deleteDirectory需要10分钟以上，使用rm -rf只需1分钟。

下面是我们粗略的Java实现:

// Delete directory given and all subdirectories and files (i.e. recursively).
//
static public boolean deleteDirectory( File file ) throws IOException, InterruptedException {

    if ( file.exists() ) {

        String deleteCommand = "rm -rf " + file.getAbsolutePath();
        Runtime runtime = Runtime.getRuntime();

        Process process = runtime.exec( deleteCommand );
        process.waitFor();

        return true;
    }

    return false;

}

如果您正在处理大型或复杂的目录，值得一试。

番石榴21.0及以上版本

有一个void deleterecursive (Path Path, RecursiveDeleteOption…)options)会抛出从Guava 21.0开始可用的MoreFiles类的IOException静态方法。

请参阅Javadoc文档:

public static void deleteRecursively(Path path, RecursiveDeleteOption... options) throws IOException Deletes the file or directory at the given path recursively. Deletes symbolic links, not their targets (subject to the caveat below). If an I/O exception occurs attempting to read, open or delete any file under the given directory, this method skips that file and continues. All such exceptions are collected and, after attempting to delete all files, an IOException is thrown containing those exceptions as suppressed exceptions.