Create file if it doesn't exist in Groovy

Question

I have a Groovy script where I am downloading a file from a url to my local machine like so..

URL url = new URL("http://i.imgur.com/pszAeGh.png")
HttpURLConnection urlConn =  url.openConnection()
File pic = new File('/Users/me/Downloads', 'myimage.jpg')
pic.append(urlConn.getInputStream())

If the 'myimage.jpg' doesn't exist in the Downloads folder, I want the script to create it. How can I specify that? Right now the 3rd line gives

java.io.FileNotFoundException: /Users/me/Downloads/myimage.jpg (No such file or directory)

Some other posts for Java have suggested using the createNewFile method but Groovy is failing even when it tries to create the file.

You have `/Users/me/Downloads` in the code, but `/Users/Downloads/me` in the error message... Which is it? — tim_yates, Apr 21 '16 at 15:25
I am sorry, it should be /Users/me/Downloads in both cases, I will fix that. — AbuMariam, Apr 21 '16 at 15:35

score 6 · Accepted Answer · answered Apr 21 '16 at 15:49

6

You should just be able to do:

new File('/Users/me/Downloads', 'myImage.gif').withOutputStream { os ->
    os << new URL("http://i.imgur.com/pszAeGh.png").openStream()
}

Assuming /Users/me/Downloads exists

answered Apr 21 '16 at 15:49

tim_yates

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Create file if it doesn't exist in Groovy

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