递归获取目录下的所有文件

public  List researchfile(File file,List list3) {
String path = "";
if (file.isDirectory()) {
File[] filearray = file.listFiles();
for (File f : filearray) {
if (!f.isDirectory()) {
path = f.getAbsoluteFile().getPath();
list3.add(path);
System.out.println(f.getAbsoluteFile().getPath());
}
researchfile(f);
}
}
return list3;
}