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);
}
}
}