How to check the file string path is valid in java

Question

I am beginner at java and I want to check if the string path that the user provide for the file is valid or not, e.g if the path exists, if contains is not null and the file is not empty and etc. How can I do that?

private static final String FILE_PATH = "com.var.file.path";
String file_path = System.getProperty(FILE_PATH, DEFAULT_FILE_PATH);

Which version of Java are you using? If 7+ You could also use [`Files.exists(Paths.get(file_path))`](http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#exists(java.nio.file.Path,%20java.nio.file.LinkOption...)) — Edd, Oct 10 '14 at 10:46
and when the file does not exist how can I log the error message via logger? the code stuck after when the file does not exist — user3409650, Oct 10 '14 at 10:56
yes I use that and I slo need to close the file but do not know where to do that inside try and catch — user3409650, Oct 10 '14 at 13:28

score 1 · Answer 1 · answered Dec 07 '14 at 04:05

There is a boolean built in to the File class that will check it for you.

Do:

if(new File(file_path).exists())
{
    //Do Stuff
}else{
    System.err.println("Error: " + file_path + " does not exist.");
    //Or whatever other output stream you want to use
}

How to check the file string path is valid in java

1 Answers1