JAVA-6503: Image compression in Java (#14081)

image-compressing/README.md

@@ -0,0 +1 @@
+This module contains tutorials related to the image compression in Java.

image-compressing/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>image-compressing</artifactId>
+
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>net.coobird</groupId>
+            <artifactId>thumbnailator</artifactId>
+            <version>${thumbnailator.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.0</version>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <thumbnailator.version>0.4.19</thumbnailator.version>
+    </properties>
+
+</project>

image-compressing/src/main/java/com/baeldung/image/compression/ImageCompressor.java

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+package com.baeldung.image.compression;
+
+
+import javax.imageio.ImageIO;
+import javax.imageio.ImageWriteParam;
+import javax.imageio.ImageWriter;
+import javax.imageio.stream.ImageOutputStream;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.Iterator;
+
+
+public class ImageCompressor {
+
+    public static void compressImage(String inputPath, String outputPath) throws IOException {
+        File inputFile = new File(inputPath);
+        BufferedImage inputImage = ImageIO.read(inputFile);
+
+        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
+        ImageWriter writer = writers.next();
+
+        File outputFile = new File(outputPath);
+        ImageOutputStream outputStream = ImageIO.createImageOutputStream(outputFile);
+        writer.setOutput(outputStream);
+
+        ImageWriteParam params = writer.getDefaultWriteParam();
+        params.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        params.setCompressionQuality(0.5f);
+
+        writer.write(null, new javax.imageio.IIOImage(inputImage, null, null), params);
+
+        outputStream.close();
+        writer.dispose();
+    }
+}

image-compressing/src/main/java/com/baeldung/image/compression/ThumbnailsCompressor.java

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+package com.baeldung.image.compression;
+
+
+import net.coobird.thumbnailator.Thumbnails;
+
+import java.io.File;
+import java.io.IOException;
+
+public class ThumbnailsCompressor {
+
+    public static void compressImage(String inputPath, String outputPath) throws IOException {
+        File input = new File(inputPath);
+        File output = new File(outputPath);
+        Thumbnails.of(input)
+                .scale(1)
+                .outputQuality(0.5)
+                .toFile(output);
+    }
+}

image-compressing/src/test/java/com/baeldung/image/compression/ImageCompressorUnitTest.java

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+package com.baeldung.image.compression;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+class ImageCompressorUnitTest {
+    @Test
+    void testSecondFileIsSmaller() throws IOException {
+        String inputImagePath = ImageCompressorUnitTest.class.getClassLoader()
+                .getResource("input.jpg").getPath();
+        File inputImage = new File(inputImagePath);
+        long inputImageSize = inputImage.length();
+        String outputPath = inputImagePath + "compressed.jpg";
+        ImageCompressor.compressImage(inputImagePath, outputPath);
+        File compressedImage = new File(outputPath);
+        long compressedImageSize = compressedImage.length();
+
+        assertTrue(compressedImageSize < inputImageSize, "The compressed image is smaller in size");
+    }
+}

image-compressing/src/test/java/com/baeldung/image/compression/ThumbnailsCompressorUnitTest.java

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+package com.baeldung.image.compression;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ThumbnailsCompressorUnitTest {
+    @Test
+    void testCompressedImageIsSmaller() throws IOException {
+        String inputImagePath = ThumbnailsCompressor.class.getClassLoader()
+                .getResource("input.jpg").getPath();
+        File inputImage = new File(inputImagePath);
+        long inputImageSize = inputImage.length();
+        String outputPath = inputImagePath + "compressed.jpg";
+        ThumbnailsCompressor.compressImage(inputImagePath, outputPath);
+        File compressedImage = new File(outputPath);
+        long compressedImageSize = compressedImage.length();
+
+        assertTrue(compressedImageSize < inputImageSize, "The compressed image is smaller in size");
+    }
+}

pom.xml

@@ -811,6 +811,7 @@
 
                 <module>lightrun</module>
                 <module>tablesaw</module>
+                <module>image-compressing</module>
                 <module>geotools</module>
 
                 <module>jws</module>
@@ -1073,6 +1074,7 @@
 
                 <module>lightrun</module>
                 <module>tablesaw</module>
+                <module>image-compressing</module>
                 <module>geotools</module>
 
                 <module>jws</module>