java读取磁盘并遍历磁盘文件过程解析

//1. 获取本机盘符
File[] roots = File.listRoots();
for (int i = 0; i < roots.length; i++) {
  System.out.print(roots[i].getPath()+"; ");//磁盘路径
  System.out.print(roots[i].getTotalSpace()/1024/1024/1024+"; ");//磁盘总空间大小
  System.out.print(roots[i].getUsableSpace()/1024/1024/1024+"; ");//剩余磁盘空间大小
  System.out.println(roots[i].getFreeSpace()/1024/1024/1024);//剩余磁盘空间大小
}

C:\; 119; 71; 71
D:\; 299; 233; 233
E:\; 309; 308; 308
F:\; 321; 320; 320
W:\; 588; 358; 358

File[] roots = File.listRoots();
FileSystemView sys = FileSystemView.getFileSystemView();
for (int i = 0; i < roots.length; i++) {
  if(!sys.getSystemTypeDescription(roots[i]).equals("本地磁盘")){
    continue;
  }
  System.out.println(roots[i].getPath());// 磁盘路径
}

C:\
D:\
E:\
F:\

File file = new File("F:\\test\\a\\b");
if (!file.exists()) {
  file.mkdirs();// 目录不存在，创建根目录
}

File file = new File("E:\\");
SimpleDateFormat dateFormat = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");
System.out.println(file.getTotalSpace()/1024/1024/1024);// b-kb-M-G
if (file.isAbsolute()) { // 判断是否为根目录
  File[] list = file.listFiles(); // 使用数组接收带有完整路径的文件夹
  for (int i = 0; i < list.length; i++) {
    System.out.println(list[i].getPath());
    System.out.println(list[i].getTotalSpace());　
    System.out.println(dateFormat.format(list[i].lastModified()));    
  }
}

File file = new File("F:\\test");
getAllFilePath(file);
public static void getAllFilePath(File dir){
  File[] files=dir.listFiles();
  for(int i=0;i<files.length;i++){
    if(files[i].isDirectory()){
      System.out.println(files[i].getPath());
      //这里面用了递归的算法 
      getAllFilePath(files[i]);  
    } else {
      System.out.println(files[i].getPath());
  }
  }
 }

F:\test\a
F:\test\a\b

File file = new File("F:\\test");
getAllFileSize(file);
public static long getAllFileSize(File dir){
  File[] files=dir.listFiles();
  for(int i=0;i<files.length;i++){
    if(files[i].isDirectory()){
      //这里面用了递归的算法 
      getAllFileSize(files[i]);
    } else {
      sum+=files[i].length();
      System.out.println(files[i]+"的大小："+files[i].length());
  }
  }
  return sum;
 }

File filePath = new File("D:\\11.png");
String fileToday = DateUtils.formatTimeYMD(new Date());
//创建目录rootPath
String rootPath = "E:/fileUpload/"+fileToday+"/";
File file = new File(rootPath);
if (!file.exists()) {
  file.mkdirs();//目录不存在，创建根目录
}
String picPath = getPath(rootPath, "videoFile");
saveFile(picPath, filePath);
private static boolean saveFile(String path,File uploadFile) {
  //Files.copy(source, out);//可以直接用这个方法保存
  int bufferSize = 8192;//8kb
  //写文件
  try {
    File f = new File(path+"/", uploadFile.getName());
    if (!f.exists()) {
      f.createNewFile();
    }
    InputStream in = new BufferedInputStream(new FileInputStream(uploadFile),bufferSize);
    OutputStream out =new BufferedOutputStream(new FileOutputStream(f),bufferSize) ;
    byte[] buffer = new byte[bufferSize];
    int len = 0;
    while ((len = in.read(buffer)) >0) {
      out.write(buffer,0,len);
    }
    out.flush();
    out.close();
  } catch (IOException e) {
    e.printStackTrace();
    return false;
  }
  return true;
}

File filePath = new File("D:/home/logs/backupsystem_error.log");
boolean result = filePath.delete();//true表示删除成功
System.out.println(result);