用io流复制目录

import java.io.*;

public class Copy {
    public static void main(String[] args) {
        //待复制的目录
        File f1 = new File("E:\\COURSE");
        //复制到此目录
        File f2 = new File("D:\\");
        fileCopy(f1,f2);
    }
    //创建复制方法
    public static void fileCopy(File f1,File f2){
    	//是文件就io流复制文件
        if (f1.isFile()){
            FileInputStream fis = null;
            FileOutputStream fos = null;
            try {
                fis = new FileInputStream(f1);
                fos = new FileOutputStream( (f2.getAbsolutePath().endsWith("\\") ? f2.getAbsolutePath() : f2.getAbsolutePath() + "\\") + f1.getAbsolutePath().substring(3),true);
                byte[] bytes = new byte[1024*1024];
                int readCount = 0;
                while ((readCount = fis.read(bytes)) != -1){
                    fos.write(bytes,0,readCount);
                }
                fos.flush();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }finally {
                if (fis != null){
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fos != null){
                    try {
                        fos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return;
        }
        File[] files = f1.listFiles();
        for (File file : files) {
        	//是目录就复制目录
            if (file.isDirectory()) {
                String s = (f2.getAbsolutePath().endsWith("\\") ? f2.getAbsolutePath() : f2.getAbsolutePath() + "\\") + file.getAbsolutePath().substring(3);
                File f = new File(s);
                if (!f.exists()) {
                    f.mkdirs();
                }
            }
            fileCopy(file, f2);
        }
    }
}