写入OSX的/Library/Application Support文件夹将引发IOException:权限被拒绝 [英] Writing to OSX's /Library/Application Support folder throws IOException: Permission denied

问题描述

我正在尝试将我的应用程序数据存储到/Library/Application Support/myAppFolder.

I'm trying to store my app's data to /Library/Application Support/myAppFolder.

我正在尝试使用此代码(通过调试)

I am trying with this code (via debug)

String content = "This is the content to write into file";

File file = new File("/Library/Application Support/filename.txt");


            // if file doesnt exists, then create it
            if (!file.exists()) {
                file.mkdir();
                    file.createNewFile();
            }

            FileWriter fw = new FileWriter(file.getAbsoluteFile());
            BufferedWriter bw = new BufferedWriter(fw);
            bw.write(content);
            bw.close();

            System.out.println("Done");

但是java.io.IOException:拒绝权限被抛出.

but java.io.IOException: Permission denied is thrown.

推荐答案

让我们开始...

if (!file.exists()) {
    file.mkdir();
    file.createNewFile();
}

FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);

您创建一个名为/Library/Application Support/filename.txt的目录，然后尝试创建一个名为/Library/Application Support/filename.txt的文件，然后尝试读取该文件...这是一个目录...

You create a directory named /Library/Application Support/filename.txt, you then attempt to create a file named /Library/Application Support/filename.txt and then attempt to read said file...which is a directory...

暂时假设您实际上具有对/Library/Application Support的读/写权限，filename.txt是目录，因此任何将其视为文件的尝试都将失败.

Let's assume for the moment that you actually have read/write permissions for /Library/Application Support, filename.txt is a directory, so any attempt to treat it like a file will fail.

但是

File file = new File("/Library/Application Support/filename.txt");

应该是...

File file = new File(System.getProperty("user.home") + "/Library/Application Support/filename.txt");

通过这种方式，您将写入当前用户的主目录，您更有可能对该目录具有读/写权限.

This way you'll be writing to the current users home directory, which you're more likely to have read/write permissions for.

此外，您的file应该指向您的应用程序目录(而不是文件)

Also, your file should be pointing to your applications directory (not a file)

File file = new File(System.getProperty("user.home") + "/Library/Application Support/Your Application Directory");

那么您可以使用更多类似的东西...

Then you could use something more like...

if (file.exists() || file.mkdir()) {
    file = new File(file, "filename.txt");
    file.createNewFile();
}

现在您可以使用file对其进行读/写操作(因为它现在指向System.getProperty("user.home") + "/Library/Application Support/Your Application Directory"内部的filename.txt)

And now you can use file to read/write stuff to (as it now points to filename.txt inside System.getProperty("user.home") + "/Library/Application Support/Your Application Directory")

这篇关于写入OSX的/Library/Application Support文件夹将引发IOException:权限被拒绝的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！