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Get file size efficiently in Java (#14970)

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* Get file size efficiently in Java

* Get file size efficiently in Java

* Get file size efficiently in Java

* Update FileSizeBenchmark.java
This commit is contained in:
Michael Olayemi 2023-10-19 12:15:54 +00:00 committed by GitHub
parent ec26c2802c
commit 3178d8cb59
2 changed files with 90 additions and 0 deletions
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67
core-java-modules/core-java-io/src/main/java/com/baeldung/sizebenchmark/FileSizeBenchmark.java Normal file
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@ -0,0 +1,67 @@
package com.baeldung.sizebenchmark;
import org.apache.commons.io.FileUtils;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.nio.channels.FileChannel;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.SingleShotTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Warmup(iterations = 3, time = 10, timeUnit = TimeUnit.NANOSECONDS)
@Measurement(iterations = 3, time = 10, timeUnit = TimeUnit.NANOSECONDS)
public class FileSizeBenchmark {
public static void main(String[] args) throws Exception {
org.openjdk.jmh.Main.main(args);
}
@Benchmark
public void getFileSizeUsingLengthMethod(Blackhole blackhole) throws Exception {
File file = new File("src/test/resources/size/sample_file_1.in");
blackhole.consume(file.length());
}
@Benchmark
public void getFileSizeUsingFileInputStream(Blackhole blackhole) throws Exception {
try (FileInputStream fis = new FileInputStream("src/test/resources/size/sample_file_1.in")) {
long result = fis.getChannel().size();
blackhole.consume(result);
}
}
@Benchmark
public void getFileSizeUsingInputStreamAndUrl(Blackhole blackhole) throws Exception {
File me = new File("src/test/resources/size/sample_file_1.in");
URL url = me.toURI().toURL();
try (InputStream stream = url.openStream()) {
blackhole.consume(stream.available());
}
}
@Benchmark
public void getFileSizeUsingApacheCommon(Blackhole blackhole) {
File imageFile = new File("src/test/resources/size/sample_file_1.in");
long size = FileUtils.sizeOf(imageFile);
blackhole.consume(size);
}
@Benchmark
public void getFileSizeUsingFileChannel(Blackhole blackhole) throws IOException {
Path imageFilePath = Paths.get("src/test/resources/size/sample_file_1.in");
try (FileChannel imageFileChannel = FileChannel.open(imageFilePath)) {
long imageFileSize = imageFileChannel.size();
blackhole.consume(imageFileSize);
}
}
}

23
core-java-modules/core-java-io/src/test/java/com/baeldung/size/JavaFileSizeUnitTest.java
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@ -3,7 +3,10 @@ package com.baeldung.size;
import static org.junit.Assert.assertEquals;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.nio.channels.FileChannel;
import java.nio.file.Path;
import java.nio.file.Paths;
@ -62,4 +65,24 @@ public class JavaFileSizeUnitTest {
final long length = file.length();
return length;
}
@Test
public void whenGetFileSizeUsingFileInputStream_thenCorrect() throws IOException {
try (FileInputStream fis = new FileInputStream(filePath)) {
long result = fis.getChannel().size();
assertEquals(EXPECTED_FILE_SIZE_IN_BYTES, result);
}
}
@Test
public void whenGetFileSizeUsingUrlAndInputStream_thenCorrect() throws IOException {
File file = new File(filePath);
URL url = file.toURI().toURL();
try (InputStream stream = url.openStream()) {
assertEquals(EXPECTED_FILE_SIZE_IN_BYTES, stream.available());
}
}
}