Java遍历文件夹的2种
Java遍历文件夹的2种方法：A.不使用递归：
import java.io.File;
import java.util.LinkedList;
public class FileSystem {
public static void main(String[] args) {
long a = System.currentTimeMillis();
LinkedList list = new LinkedList();
File dir = new File("c:\\java\\");
File file[] = dir.listFiles();
for (int i = 0; i < file.length; i++) {
if (file.isDirectory())
list.add(file);
else
System.out.println(file.getAbsolutePath());
}
File tmp;
while (!list.isEmpty()) {
tmp = list.removeFirst();
if (tmp.isDirectory()) {
file = tmp.listFiles();
if (file == null)
continue;
for (int i = 0; i < file.length; i++) {
if (file.isDirectory())
list.add(file);
else
System.out.println(file.getAbsolutePath());
}
} else {
System.out.println(tmp.getAbsolutePath());
}
}
System.out.println(System.currentTimeMillis() - a);
}
}
B.使用递归：
import java.io.File;
import java.util.ArrayList;
public class FileSystem1 {
private static ArrayList filelist = new ArrayList();
public static void main(String[] args) {
long a = System.currentTimeMillis();
refreshFileList("c:\\java");
System.out.println(System.currentTimeMillis() - a);
}
public static void refreshFileList(String strPath) {
File dir = new File(strPath);
File[] files = dir.listFiles();
if (files == null)
return;
for (int i = 0; i < files.length; i++) {
if (files.isDirectory()) {
refreshFileList(files.getAbsolutePath());
} else {
String strFileName = files.getAbsolutePath().toLowerCase();
System.out.println("---"+strFileName);
filelist.add(files.getAbsolutePath());
}
}
}
}
结论：经过测试，使用递归的方法B性能相对好一些。
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