java文件复制

/* 复制整个文件夹内容  
*   
* @param oldPath  
*            String 原文件路径 如：c:/old
* @param newPath  
*            String 复制后路径 如：f:/new
* @return boolean  
*/   
private static void copyFolder(String oldPath, String newPath) {    
   
    try {    
        (new File(newPath)).mkdirs(); // 如果文件夹不存在 则建立新文件夹    
        File a = new File(oldPath);    
        String[] file = a.list();    
        File temp = null;    
        for (int i = 0; i < file.length; i++) {    
            if (oldPath.endsWith(File.separator)) {    
                temp = new File(oldPath + file[i]);    
            } else {    
                temp = new File(oldPath + File.separator + file[i]);    
            }    
            if (temp.isFile()) {    
                FileInputStream input = new FileInputStream(temp);    
                FileOutputStream output = new FileOutputStream(newPath + "/" + (temp.getName()).toString());    
                byte[] b = new byte[1024 * 5];    
                int len;    
                while ((len = input.read(b)) != -1) {    
                    output.write(b, 0, len);    
                }    
                output.flush();    
                output.close();    
                input.close();    
            }    
            if (temp.isDirectory()) {// 如果是子文件夹    
                copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);    
            }    
        }    
    } catch (Exception e) {    
        System.out.println("复制整个文件夹内容操作出错");    
        e.printStackTrace();    
    }    
}