public class test {private int sum; //文件夹大小private String path; //路径private File f;public static void main(String[]args) throws IOException{ test t=new test("D:/d"); System.out.println(t.getSum());}public test(String path){ this.path=path; this.f=new File(path); N(this.f);}public int getSum(){ return this.sum;}//递归打印获得文件夹大小private int N(File f){ if(null!=f&&f.exists()) { if(f.isFile()) //是文件才能获得大小 { sum+=f.length(); } else if(f.isDirectory()) { File[] ss=f.listFiles(); for(File r:ss) { N(r); } } } return sum; }}