java Java 中的文件存储 getUnallocatedSpace()方法，示例

Java 中的文件存储 getUnallocatedSpace()方法，示例

原文:https://www . geesforgeks . org/filestore-getunallatedspace-method-in-Java-with-examples/

一个文件存储类的 getUnallocatedSpace() 方法用于获取文件存储中未分配的字节数。此方法对于检查可用空间很有用。此方法将可用的未分配空间作为长值返回。 语法:

public abstract long getUnallocatedSpace()
                     throws IOException

参数:此方法不接受任何内容。 返回值:该方法将可用未分配空间作为长值返回。 异常:如果出现输入输出错误，该方法抛出 IOException 。下面的程序说明了 getUnallocatedSpace()方法: 程序 1:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to demonstrate
// FileStore.getUnallocatedSpace() method

import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class GFG {

    public static void main(String[] args)
    {
        // create the object of Path
        Path path
            = Paths.get(
                "E:\\Tutorials\\file.txt");

        // get FileStore object
        try {

            FileStore fs
                = Files.getFileStore(path);

            // print FileStore name and Total unused size
            System.out.println("FileStore Name: "
                               + fs.name());
            long bytes = fs.getUnallocatedSpace();
            long sizeInGB = bytes / (1024 * 1024 * 1024);
            System.out.println("Free Space : "
                               + sizeInGB + "GB");
        }
        catch (IOException e) {

            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

输出:

程序 2:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to demonstrate
// FileStore.getUnallocatedSpace() method

import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class GFG {

    public static void main(String[] args)
    {
        // create the object of Path
        Path path
            = Paths.get(
                "C:\\Movies\\&#092;;&#048;01.txt");

        // get FileStore object
        try {

            FileStore fs
                = Files.getFileStore(path);

            // print FileStore name and Total size
            System.out.println("FileStore Name: "
                               + fs.name());
            System.out.println("Free Space in bytes: "
                               + fs.getUnallocatedSpace());
        }
        catch (IOException e) {

            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}