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BAEL-7106-compress-and-uncompress-bytes-2 (#15398)

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vunamtien 2023-12-15 14:29:22 +07:00 committed by GitHub
parent 9dcd9c9c20
commit 51f2ed495b
2 changed files with 56 additions and 0 deletions
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17
core-java-modules/core-java-lang-6/src/main/java/com/baeldung/compressbytes/CompressByteArrayUtil.java
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@ -23,6 +23,23 @@ public class CompressByteArrayUtil {
return outputStream.toByteArray();
}
public static byte[] compressWithCustomLevel(byte[] input, int level) {
Deflater deflater = new Deflater();
deflater.setInput(input);
deflater.setLevel(level);
deflater.finish();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
while (!deflater.finished()) {
int compressedSize = deflater.deflate(buffer);
outputStream.write(buffer, 0, compressedSize);
}
return outputStream.toByteArray();
}
public static byte[] decompress(byte[] input) throws DataFormatException {
Inflater inflater = new Inflater();
inflater.setInput(input);

39
core-java-modules/core-java-lang-6/src/test/java/com/baeldung/compressbytes/CompressByteArrayUnitTest.java Normal file
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@ -0,0 +1,39 @@
package com.baeldung.compressbytes;
import org.junit.jupiter.api.Test;
import java.util.zip.DataFormatException;
import static org.junit.jupiter.api.Assertions.assertEquals;
public class CompressByteArrayUnitTest {
private static final String INPUT_STRING = "Building a REST API is not a trivial task – from the high-level RESTful " +
"constraints down to the nitty-gritty of making everything work and work well." +
"Spring has made REST a first-class citizen and the platform has been maturing in leaps and bounds." +
"With this guide, my aim is to organize the mountains of information that are available on the subject and " +
"guide you through properly building an API." +
"The guide starts with the basics – bootstrapping the REST API, the Spring MVC Configuration, and basic customization.";
@Test
void givenInputString_whenCompressWithDefaultLevel_thenDecompressWithSameSize() throws DataFormatException {
byte[] input = INPUT_STRING.getBytes();
byte[] compressedData = CompressByteArrayUtil.compress(input);
byte[] decompressedData = CompressByteArrayUtil.decompress(compressedData);
System.out.println("Original: " + input.length + " bytes");
System.out.println("Compressed: " + compressedData.length + " bytes");
System.out.println("Decompressed: " + decompressedData.length + " bytes");
assertEquals(input.length, decompressedData.length);
}
@Test
void givenInputString_whenCompressWithCustomLevel_thenDecompressWithSameSize() throws DataFormatException {
byte[] input = INPUT_STRING.getBytes();
byte[] compressedData = CompressByteArrayUtil.compressWithCustomLevel(input, 1);
byte[] decompressedData = CompressByteArrayUtil.decompress(compressedData);
System.out.println("Original: " + input.length + " bytes");
System.out.println("Compressed: " + compressedData.length + " bytes");
System.out.println("Decompressed: " + decompressedData.length + " bytes");
assertEquals(input.length, decompressedData.length);
}
}