What is a safe way to create a Temp file in Java?

Question

I\'m looking for a safe way to create a temp file in Java. By safe, I mean the following:

• Name should be unique, even under potential race co

Answer 1

Use File.createTempFile().

File tempFile = File.createTempFile("prefix-", "-suffix");
//File tempFile = File.createTempFile("MyAppName-", ".tmp");
tempFile.deleteOnExit();

Will create a file in the temp dir, like:

prefix-6340763779352094442-suffix

Answer 2

Since Java 7 there is the new file API "NIO2" which contains new methods for creating temnp files and directories. See

• createTempDirectory
• createTempDirectory
• createTempFile
• createTempFile

e.g.

Path tempDir = Files.createTempDirectory("tempfiles");

or

Path tempFile = Files.createTempFile("tempfiles", ".tmp");

Answer 3

String tempfilePath = System.getProperty("java.io.tmpdir");
tempfilePath = tempfilePath.concat("filename.extension");

doesn't require prefix.