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BAEL-4391: Check if a file exists in Java (#9748) 

* Check if a file exists in Java

* Simple Assertions
This commit is contained in:
Mona Mohamadinia 2020-08-02 20:00:53 +04:30 committed by GitHub
parent 80091e154a
commit 8527d58063
2 changed files with 93 additions and 0 deletions
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2
core-java-modules/core-java-io-3/.gitignore vendored Normal file
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test-link*
0.*

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core-java-modules/core-java-io-3/src/test/java/com/baeldung/existence/ExistenceUnitTest.java Normal file
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package com.baeldung.existence;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.ThreadLocalRandom;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
public class ExistenceUnitTest {
@Test
public void givenFile_whenDoesNotExist_thenFilesReturnsFalse() {
Path path = Paths.get("does-not-exist.txt");
assertFalse(Files.exists(path));
assertTrue(Files.notExists(path));
}
@Test
public void givenFile_whenExists_thenFilesShouldReturnTrue() throws IOException {
Path tempFile = Files.createTempFile("baeldung", "exist-nio");
assertTrue(Files.exists(tempFile));
assertFalse(Files.notExists(tempFile));
Path tempDirectory = Files.createTempDirectory("baeldung-exists");
assertTrue(Files.exists(tempDirectory));
assertFalse(Files.notExists(tempDirectory));
assertTrue(Files.isDirectory(tempDirectory));
assertFalse(Files.isDirectory(tempFile));
assertTrue(Files.isRegularFile(tempFile));
assertTrue(Files.isReadable(tempFile));
Files.deleteIfExists(tempFile);
Files.deleteIfExists(tempDirectory);
}
@Test
public void givenSymbolicLink_whenTargetDoesNotExists_thenFollowOrNotBasedOnTheOptions() throws IOException {
Path target = Files.createTempFile("baeldung", "target");
Path symbol = Paths.get("test-link-" + ThreadLocalRandom.current().nextInt());
Path symbolicLink = Files.createSymbolicLink(symbol, target);
assertTrue(Files.exists(symbolicLink));
assertTrue(Files.isSymbolicLink(symbolicLink));
assertFalse(Files.isSymbolicLink(target));
Files.deleteIfExists(target);
assertFalse(Files.exists(symbolicLink));
assertTrue(Files.exists(symbolicLink, LinkOption.NOFOLLOW_LINKS));
Files.deleteIfExists(symbolicLink);
}
@Test
public void givenFile_whenDoesNotExist_thenFileReturnsFalse() {
assertFalse(new File("invalid").exists());
assertFalse(new File("invalid").isFile());
}
@Test
public void givenFile_whenExist_thenShouldReturnTrue() throws IOException {
Path tempFilePath = Files.createTempFile("baeldung", "exist-io");
Path tempDirectoryPath = Files.createTempDirectory("baeldung-exists-io");
File tempFile = new File(tempFilePath.toString());
File tempDirectory = new File(tempDirectoryPath.toString());
assertTrue(tempFile.exists());
assertTrue(tempDirectory.exists());
assertTrue(tempFile.isFile());
assertFalse(tempDirectory.isFile());
assertTrue(tempDirectory.isDirectory());
assertFalse(tempFile.isDirectory());
assertTrue(tempFile.canRead());
Files.deleteIfExists(tempFilePath);
Files.deleteIfExists(tempDirectoryPath);
}
}