how to set read only access for file using java

问题

How to set read-only access for a file that's been created and written using java InputStream API.

回答1:

In my opinion, it's good to check whether the file has been created or exists first and then set the read only flag.

    File file = new File("C:/path/file.txt");
    if (file.exists()) {
        file.setReadOnly();
    } else {
        System.out.println("File does not exists.");
    }

回答2:

Well their are two ways to do it.

The first would be: myFile.setReadable(false);. This make the file unreadable by all applications. The other way would be myFile.setReadOnly();.

Note that in order for you to read the file from your application you will need to clear the ready only flag. To clear it use myFile.setReadable(true);.

Another thing to note would be that setting this flag only stops SOME applications from reading it, a lot of editors allow you to clear the flag. This will not prevent the user from deleting or moving the file as well.

回答3:

Try this

File file = new File("C:\\pathToYourFile\\yourFile.txt") //for example
file.setReadOnly();

or if you use just

File file = new File("C:\\pathToDirectory");

you can lock the whole folder to be read only, if the current user has permission to modify access in that folder

回答4:

You could create new file object like this with readOnly property:

File readOnlyFile= new File("C:/test.txt");
readOnlyFile.setReadOnly();

来源：https://stackoverflow.com/questions/32947389/how-to-set-read-only-access-for-file-using-java

标签

java

inputstream

file-handling