grails - 如何在grails中获取文件扩展名？

Question

I recently started working on grails and i want to know how to get the extension of a file. Ex: test.txt. I want to check extension(txt)? any clue?

Answer 1

这是另一种方式。使用正则表达式。

def fileName = 'something.ext'
def matcher = (fileName =~ /.*\.(.*)$/)

if(matcher.matches()) {
    def extension = matcher[0][1]

    if(extension in ['jpg', 'jpeg', 'png']) {
        // Good to go
        println 'ok'
    } else {
        println 'not ok'
    }
} else {
    println 'No file extension found'
}