java 中的 java.nio.file.FileSystems 类
原文:https://www . geesforgeks . org/Java-nio-file-files systems-class-in-Java/
Java . nio . file . file systems类充当了创建新文件系统的工厂。这个类提供了创建文件系统的方法。这个文件系统充当创建不同对象的工厂，如路径、路径匹配器、用户原则允许服务和监视服务。该对象有助于访问文件系统中的文件和其他对象。
语法:类声明
public final class FileSystems extends Object
此类的方法如下:
| 方法 | 描述 | | --- | --- | | getDefault（） | 这个方法返回一个新的默认文件系统。 | | getFileSystem(URI) | 该方法返回对现有文件系统的引用。 | | 新文件系统(路径路径，类加载器加载器) | 该方法用于构建一个新的文件系统来访问该文件系统的文件内容。 | | newFileSystem(URI，mapenv) | 此方法用于使用给定的 URI 创建新的文件系统 | | newFileSystem(URI，mapenv，ClassLoader) | 此方法用于使用给定的 URI 创建新的文件系统 |例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate FileSystems Class by
// creating a new file system using getDefault() method and
// printing its file stores and root directories
// Importing classes from java.nio package
// for network linking
import java.nio.file.FileStore;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Path;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Create a new file system by
// creating object of FileSystem class
// using getDefault() method
FileSystem filesystem
= FileSystems.getDefault();
// Display commands only
System.out.println(
"File System created successfully");
System.out.println(
"Underlying file stores of this FileSystem :");
// Printing the underlying file stores of this
// FileSystem using for each loop
for (FileStore store :
filesystem.getFileStores()) {
// Print statement
System.out.println(store.toString());
}
// Display message only
System.out.println(
"Root directories of this FileSystem :");
// Printing the root directories of this
// FileSystem using for each loop
for (Path rootdir :
filesystem.getRootDirectories()) {
// Print statement
System.out.println(rootdir.toString());
}
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the exception along with line number
// using printStackTrace() method
e.printStackTrace();
}
}
}
输出:
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate FileSystems Class by
// creating new file system using newFileSystem() method
// Importing URI class from java.net package
import java.net.URI;
// Importing required file classes from java.nio package
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.file.Paths;
// Importing Map and HashMap classes from java.util package
import java.util.HashMap;
import java.util.Map;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating object of Map class
// Declaring object of string types
Map<String, String> env = new HashMap<>();
// Getting path of zip file
Path zipPath = Paths.get("ZipFile.zip");
// Creating URI from zip path received
URI Uri
= new URI("jar:file",
zipPath.toUri().getPath(), null);
// Create new file system from uri
FileSystem filesystem
= FileSystems.newFileSystem(Uri, env);
// Display message for better readability
System.out.println(
"FileSystem created successfully");
// Checking if file system is open or not
// using isOpen() method
if (filesystem.isOpen())
// Print statement
System.out.println("File system is open");
else
// Print statement
System.out.println("File system is close");
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the exception with line number
// using the printStack() method
e.printStackTrace();
}
}
}
输出:
File System created successfully
File system is open
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