java使用iterator遍历指定目录示例分享

2026-01-16 16:51:23 作者：用户投稿

可以遍历指定目录（一个或多个）及其所有子文件，用Iterator实现

复制代码代码如下:
package archiver.util;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class FileIterator implements Iterator<File>, Iterable<File> {
private Iterator<String> iterator;
private List<String> paths;
private List<File> dirs;

public FileIterator(List<String> paths) {
  this.paths = new ArrayList<String>(paths);
  this.dirs = new ArrayList<File>();
  this.iterator = this.paths.iterator();
}

public File next() {
  File file = null;
  if (hasNext()) {
   file = new File(iterator.next());
   if (file.isDirectory()) {
    dirs.add(file);
   }
  }
  return file;
}

public boolean hasNext() {
  if (!iterator.hasNext()) {
   paths.clear();

   for (File dir : dirs) {
    for (String name : dir.list()) {
     paths.add(dir.getPath()+File.separator+name);
    }
   }
   dirs.clear();

   if (paths.size() == 0) {
    return false;
   }
   iterator = paths.iterator();
  }
  return true;
}

@Override
public void remove() {
  throw new UnsupportedOperationException();
}

@Override
public Iterator<File> iterator() {
  return this;
}

public static void main(String[] args) {
  FileIterator iter = new FileIterator(Arrays.asList("."));
  for (File file : iter) {
   System.out.println(file);
  }
}
}