子文件和文件夹大小

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Stack;

public class Test {

private static FileInputStream fis = null;

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String folderString = "D:/";
File file = new File(folderString);
File[] childFiles = file.listFiles();
for (int i = 0; i < childFiles.length; i++) {
System.out.println(childFiles[i].getName()+ " :  "+countSize(childFiles[i])/1024/1024 + " M   路径：" + childFiles[i].getAbsolutePath());
}
if (null != fis) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

public static double countSize(File file) {
int count = 0;
Stack<File> stack = new Stack<File>();
stack.push(file);
File currentFile = null;
while (!stack.empty()) {
currentFile = stack.pop();
if (currentFile.isDirectory()) {
File[] childFiles = currentFile.listFiles();
if (null != childFiles && childFiles.length > 0) {
for (int i = 0; i < childFiles.length; i++) {
stack.push(childFiles[i]);
}
}
} else {
count += getFileSize(currentFile);
}
}

return count;
}

public static double getFileSize(File file) {
double size = 0;
if (file.exists()) {
try {
fis = new FileInputStream(file);
size = (double) fis.available();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}
return size;
}

}