Create whole path automatically when writing to a new file

问题

I want to write a new file with the FileWriter. I use it like this:

FileWriter newJsp = new FileWriter(\"C:\\\\user\\Desktop\\dir1\\dir2\\filename.txt\");

Now dir1 and dir2 currently don\'t exist. I want Java to create them automatically if they aren\'t already there. Actually Java should set up the whole file path if not already existing.

How can I achieve this?

回答1:

Something like:

File file = new File("C:\\user\\Desktop\\dir1\\dir2\\filename.txt");
file.getParentFile().mkdirs();
FileWriter writer = new FileWriter(file);

回答2:

Since Java 1.7 you can use Files.createFile:

Path pathToFile = Paths.get("/home/joe/foo/bar/myFile.txt");
Files.createDirectories(pathToFile.getParent());
Files.createFile(pathToFile);

回答3:

Use File.mkdirs():

File dir = new File("C:\\user\\Desktop\\dir1\\dir2");
dir.mkdirs();
File file = new File(dir, "filename.txt");
FileWriter newJsp = new FileWriter(file);

回答4:

Use File.mkdirs().

回答5:

Use FileUtils to handle all these headaches.

Edit: For example, use below code to write to a file, this method will 'checking and creating the parent directory if it does not exist'.

openOutputStream(File file [, boolean append])

来源：https://stackoverflow.com/questions/2833853/create-whole-path-automatically-when-writing-to-a-new-file

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java

path