CODEWITHSUNDEEP
java
Pramod
Pramod

Reputation: 434

How to check if file is in locked mode?

Can someone help me to check file is already in locked mode?

My program is unable to read the file because it is in locked mode, Then I re-create file again and my programme read file with no issue.

so is there any way to check file is already in locked mode?

Upvotes: 0

Views: 1816

Answers (3)

Zweibieren
Zweibieren

Reputation: 412

The "research" suggested above gives no hint as to how to see if a file is locked. Method canWrite will return true even if the file is locked. What canWrite can do is to check to see if the directory is writable. If the directory and file are both writable but a write to the file fails, then the file is most likely locked.

My test code:

public static void main(String[]args){
    File f = new File("junk.txt");
    File dir = f.getAbsoluteFile().getParentFile();
    System.out.println("can write dir " + dir.getName()+": "+dir.canWrite());
    System.out.println("can write " + f.getName()+": "+f.canWrite());
    try (Writer w = new FileWriter(f)) {
        w.append("world\n");
        System.out.println("write succeeded");
    } catch (IOException ex) {
        System.out.println("write failed");
    }
}

In a test, I locked junk.txt by opening it in excel. When the file is locked, the output is 

    can write dir tools: true
    can write junk.txt: true
    write failed

When the file is not locked the write succeeds.

Upvotes: 1

hatched
hatched

Reputation: 865

Write to the file, if it fails, that means your file is locked.

File f = new File("suspiciousLockedFile.txt");
System.out.println(f.canWrite());

Upvotes: 0

Gaurav
Gaurav

Reputation: 406

Try to write to the file.It will be locked if you fail to write

or

try canWrite() java method from Java File API.

Refer: docs.oracle.com/javase/7/docs/api/java/io/File.html#canWrite()

Upvotes: 0

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