递归方式遍历文件夹下所有子文件夹和文件

import java.io.File;
import java.io.FileFilter;
import org.junit.Test;

public class TestFile
{

	public static long size;

	public static void main(String[] args)
	{
		TestFile t = new TestFile();
		String path = "C:/3000soft";
		t.countSize(path);
		System.out.println("文件夹大小为：" + size / 1024.0 / 1024.0 + "M");
	}

	public void countSize(String pathname)
	{

		File f = new File(pathname);

		if (!f.exists())
		{
			return;
		}

		if (f.isFile())
		{
			size += f.length();
			System.out.println(f.getAbsolutePath());
			return;
		}

		File[] child = f.listFiles();

		for (int i = 0; i < child.length; i++)
		{
			countSize(child[i].getAbsolutePath());
		}
	}
}