java Java 中的 Files isReadable()方法，示例

Java 中的 Files isReadable()方法，示例

原文:https://www . geesforgeks . org/files-is readable-in-Java-method-with-examples/

isReadable() 法的 java.nio.file 。文件帮助我们检查 Java 虚拟机是否具有适当的权限，允许它打开该文件进行读取。该方法测试文件是否可读。此方法检查文件是否存在，如果文件存在，则它是否可读。如果文件存在且可读，此方法返回 true 如果出现以下情况，此方法将返回 false:

文件不存在
execute access would be denied because the Java virtual machine has insufficient privileges,

无法确定访问权限。

语法:

public static boolean isReadable(Path path)

参数:这个方法接受一个参数路径，它是要检查的文件的路径。

返回值:如果文件存在且可读，则该方法返回真；如果出现以下情况，则该方法返回假:

文件不存在
execute access would be denied because the Java virtual machine has insufficient privileges,

无法确定访问权限。

异常:这个方法会抛出安全异常在默认提供者的情况下，安装了安全管理器，调用 checkRead 检查对文件的读访问。

下面的程序说明了一个可修改的(路径)方法: 程序 1:

// Java program to demonstrate
// Files.isReadable() method

import java.io.IOException;
import java.nio.file.*;

public class GFG {
    public static void main(String[] args)
    {

        // create object of Path
        // This file is available on windows and
        // It is a readable file.

        Path path
            = Paths.get(
                "D:\\GIT_EWS_PROJECTS\\logger"
                + "\\src\\logger"
                + "\\GFG.java");

        // check whether this file
        // is readable or not
        boolean result;
        result = Files.isReadable(path);

        System.out.println("File " + path
                           + " is Readable = "
                           + result);
    }
}

Output:

程序 2:

// Java program to demonstrate
// Files.isReadable() method

import java.io.IOException;
import java.nio.file.*;

public class GFG {
    public static void main(String[] args)
    {

        // create an object of Path
        // This file is available on windows and
        // It is not a readable file.

        Path path
            = Paths.get(
                "D:\\User Aman\\"
                + "Documents\\MobaXterm\\"
                + "\\ArrayList.docx");

        // check whether this file
        // is readable or not
        boolean result;
        result = Files.isReadable(path);

        System.out.println("File " + path
                           + " is Readable = "
                           + result);
    }
}