java-> 利用IO操作与递归实现目录的复制

public class CopyDir {

    public static void main(String[] args) {
        copyDir(new File("d:\a"), new File("d:\b"));
    }
    
    
    //file1为被复制目录， file2为目标目录
    public static void copyDir(File file1 ,File file2) {
        //目标目录不存在则创建
        if(!file2.exists()) {
            file2.mkdir();
        }
        //将源目录所有对象取出存入File[]数组中
        File[] fList =file1.listFiles();
        //遍历源目录
        for (File f : fList) {
            //当子对象为目录时在目标目录中创建此目录
            if(f.isDirectory()) {
                File file =new File(file2,f.getName());
                file.mkdir();
                //调用自己
                copyDir(f, file);
            }else if(f.isFile()) {
                //当子对象为文件时用字节流读取并写入目标目录中（复制）
                BufferedInputStream bis = null ;
                BufferedOutputStream bos = null;
                try {
                    bis = new BufferedInputStream(new FileInputStream(f));
                    bos = new BufferedOutputStream(new FileOutputStream(new File(file2,f.getName())));
                    int len = 0;
                    byte[] bytes = new byte[1024];
                    while((len = bis.read(bytes)) != -1) {
                        bos.write(bytes, 0, len);
                    }
                } catch (IOException e) {
                    throw new RuntimeException("操作失败！");
                }finally {
                    try {
                        bis.close();
                        bos.close();
                    } catch (IOException e) {
                        throw new RuntimeException("关闭失败！");
                    }        
                }        
            }
        }
    }
}