Java的.nio.file.FileStore类在Java中

Java的.nio.file是在Java中一个包，包括文件存储类。 FileStore 类是一个类，它提供了用于对文件存储执行某些操作的方法。

• FileStore 是一个从Java.lang 包扩展 Object 的类。 FileStore 类可以从Java.lang.Object 包继承的几个方法是 clone()、equals()、finalize()、getClass()、hashCode()、notify()、notifyAll()、toString()、wait( ）。
• getFileStore() 是 FileStore 类提供的一个方法，它被调用以了解文件的存储位置，通常它会告诉文件存储在 CD 驱动器中的位置。
• 并且 FileStore 还支持少数或更多类，如 FileStoreAttributeView，它提供一组文件存储属性的只读或向上视图。

语法：类声明

public abstract class FileStore extends Object
{
abstract CheckResult( );
// Here an abstract method which 
// don't have usually a method definition part. 
} 

注意：每当你为抽象类创建一个对象并试图在编译时调用它时，编译器会抛出一个错误，说“方法不完整”，这是因为抽象被称为不完整，这意味着你不能为这样的方法创建对象这个。

FileStore 类的构造函数如下：

Constructor	Description
FileStore()	This constructor Initializes a new instance of this class.

FileStore类的方法如下：

Methods	Description
getAttribute(String attribute)	This method reads the value of a file store attribute.
getFileStoreAttributeView(Class type)	This method returns a FileStoreAttributeView of the given type.
getTotalSpace()	This method returns the size, in bytes, of the file store.
getUnallocatedSpace()	This method returns the number of unallocated bytes in the file store.
getUsableSpace()	This method returns the number of bytes available to this Java virtual machine on the file store.
isReadOnly()	This method tells whether this file store is read-only.
name()	This method returns the name of this file store.
supportsFileAttributeView(Class type)	This method tells whether this file store supports the file attributes identified by the given file attribute view.
supportsFileAttributeView(String name)	This method tells whether this file store supports the file attributes identified by the given file attribute view.
type()	This method returns the type of this file store.

示例 1：

Java

// Java Program to demonstrate FileStore Class
// with its methods
 
// Importing required libraries
import java.nio.file.FileStore;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
 
// Main class
public class GFG {
 
    // Declaring and initializing variable
    static long Bytes = 1000;
 
    // Main driver method
    public static void main(String[] args) throws Exception
    {
 
        // Creating an object of FileSystem class
        FileSystem fileSystem = FileSystems.getDefault();
 
        for (FileStore fileStore :
             fileSystem.getFileStores()) {
 
            // Here we use Bytes to
            // get the usable space in terms of bytes.
 
            // Here getUsableSpace method is used to
            // know the free space in the drive.
            // then it writtens back the value into
            // usableSpace variable
            long usableSpace
                = fileStore.getUsableSpace() / Bytes;
 
            // Here we use Bytes to
            // get the used space in terms of bytes.
 
            // Here we get the usedspace value by
            // subtracting the methods given below.
            long usedSpace = (fileStore.getTotalSpace()
                              - fileStore
 
                                    .getUnallocatedSpace())
                             / Bytes;
 
            // Readonly writes true or false based on
            // the mode the we file open.
            boolean readOnly = fileStore.isReadOnly();
 
            // Print and display the information
            // that the methods are allocated with
            System.out.println(
                "All information on the FileStore");
 
            // Print and display used and unused space
            System.out.println("Used Space : " + usedSpace);
            System.out.println("Un-Used Space : "
                               + usableSpace);
 
            // Print boolean true false whether it is read
            // only
            System.out.println("Is this read only : "
                               + readOnly);
        }
    }
}

输出：

示例 2：

Java

// Java Program to demonstrate FileStore Class
// with its methods
 
// Importing required libraries
import java.nio.file.FileStore;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
 
// Main class
// FileStoreExample
public class GFG {
 
    // Main driver method
    public static void main(String[] args) throws Exception
    {
 
        // Creating an object of FileSystem class
        FileSystem fileSystem = FileSystems.getDefault();
 
        // Iterating for file storage using for each loop
        for (FileStore fileStore :
             fileSystem.getFileStores()) {
 
            // Here filestore() is used to know the
            // folder/drive name where the actual file is
            // getting stored
            String fileStoreName = fileStore.name();
 
            // This method returns the fileStore type
            String fileStoreType = fileStore.type();
 
            // Print and display commands
 
            // 1. information of file
            System.out.println(
                "All information on the FileStores\n\n");
 
            // 2. Name of a file stored
            System.out.println("File Store Name : "
                               + fileStoreName);
 
            // 3. Type of file stored
            System.out.println("File Store Type : "
                               + fileStoreType);
        }
    }
}

输出