The way to create Delicate and Exhausting Hyperlinks in Java? Recordsdata + Path + Java NIO Instance

• The goal of the hyperlink should exist
• The goal can’t be a listing
• The goal should exist on the identical partition or quantity

And, in case you are questioning distinction between arduous hyperlink and comfortable hyperlink, here’s a good diagram which clearly explains the distinction between arduous hyperlink and comfortable hyperlink. In case of arduous hyperlink, it straight level to the information within the disc whereas comfortable hyperlink factors to the file object. 

Earlier than working this Java program, right here is how my file system was trying like :

javin@workstation2  ~/Check
$ ls -lrt
whole 13666
----------+ 1 javin None      4056 Feb 17 15:54 information.txt
 
javin@workstation2 /cygdrive/d/JavaWorkspace/Check
$ ln -s information.txt link_data.txt
 
javin@workstation2 /cygdrive/d/JavaWorkspace/Check
$ ls -lrt
whole 13666
----------+ 1 javin None      4056 Feb 17 15:54 information.txt
lrwxrwxrwx  1 javin None         8 Feb 24 18:41 link_data.txt -> information.txt

And, now let’s examine this system and output to grasp it higher:

import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Recordsdata;
import java.nio.file.Path;
 

public class Testing {
 
    public static void essential(String args[]) {
 
        
        
        
        Path information = FileSystems.getDefault().getPath("~/check/information.txt");
        boolean isSoftLink = Recordsdata.isSymbolicLink(information);
        System.out.printf("Does Path : %s is a comfortable hyperlink? %b %n", information, isSoftLink);
 
        Path hyperlink = FileSystems.getDefault().getPath("~/check/link_data.txt");
        boolean isLink = Recordsdata.isSymbolicLink(hyperlink);
        System.out.printf("Does Path : %s is a comfortable hyperlink? %b %n", hyperlink, isLink);
 
        
        
        Path hardLink = FileSystems.getDefault()
                            .getPath("D:/Eclipse_workspace/Check/hardlink.txt");
        Path goal = FileSystems.getDefault()
                            .getPath("D:/Eclipse_workspace/Check/information.txt");
        attempt {
            Path newlink = Recordsdata.createLink(hardLink, goal);
        } catch (IOException e) {
            e.printStackTrace();
        }
 
    }
 
}

Does Path : ~testdata.txt is a comfortable hyperlink? false
Does Path : ~testlink_data.txt is a comfortable hyperlink? false

Issues to notice about Hyperlinks and Recordsdata in Home windows

1) Home windows does not assist comfortable hyperlinks, however arduous hyperlink is supported by Home windows

2) The Java 7 Path and Recordsdata courses work with each comfortable (symbolic) and arduous hyperlinks.

3) to find out if a Path is a symbolic hyperlink, you cross it to the Recordsdata.isSymbolicLink() methodology

In any of those examples, if the underlying OS doesn’t assist symbolic and/or arduous hyperlinks, or in case you violate one of many restrictions of arduous hyperlinks, you’ll get an IOException at runtime. Due to this fact, be able to deal with this case gracefully in your code.

Diving deeper into Java SE 7’s File IO APIs, you need to use the FileVisitor interface to find out if and the way hyperlinks are adopted, when to keep away from them (i.e. when deleting information), and detect if a round reference exists.

 By the best way, if arduous hyperlink already exists then it should throw following exception

java.nio.file.FileAlreadyExistsException: D:temphardlink.txt -> D:tempdata.txt
               at solar.nio.fs.WindowsException
.translateToIOException(WindowsException.java:81)
               at solar.nio.fs.WindowsException
.rethrowAsIOException(WindowsException.java:97)
               at solar.nio.fs.WindowsFileSystemProvider
.createLink(WindowsFileSystemProvider.java:600)
               at java.nio.file.Recordsdata.createLink(Recordsdata.java:1037)

To create a symbolic hyperlink (not supported on Home windows), you utilize the  Recordsdata.createSymbolicLink() methodology, and cross two Path objects. The primary represents the hyperlink to be created, and the second is the trail to the precise goal file or listing:

Path softlink = FileSystems.getDefault().getPath("~/new.txt");
 

Path goal = FileSystems.getDefault().getPath("~/outdated.txt");
Recordsdata.createSymbolicLink(hyperlink, goal);

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