iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

BAEL-7839: Converting Image to BufferedImage in Java (#16403) 

* BAEL-7765: How to fix JsonParseException: Unexpected character (code 115) when parsing unquoted JSON in Jackson

* BAEL-7839: Converting Image to BufferedImage in Java
This commit is contained in:
ACHRAF TAITAI 2024-04-14 19:39:25 +02:00 committed by GitHub
parent 684ee81ed1
commit a7ad916d27
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 110 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
image-processing/src/main/java/com/baeldung/imageprocessing/imagetobufferedimage/ImageToBufferedImage.java Normal file
View File

@ -0,0 +1,41 @@
package com.baeldung.imageprocessing.imagetobufferedimage;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class ImageToBufferedImage {
// Method 1: Using BufferedImage Constructor
public BufferedImage convertUsingConstructor(Image image) throws IllegalArgumentException {
int width = image.getWidth(null);
int height = image.getHeight(null);
if (width <= 0 || height <= 0) {
throw new IllegalArgumentException("Image dimensions are invalid");
}
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
bufferedImage.getGraphics().drawImage(image, 0, 0, null);
return bufferedImage;
}
// Method 2: Casting Image to BufferedImage
public BufferedImage convertUsingCasting(Image image) throws ClassCastException {
if (image instanceof BufferedImage) {
return (BufferedImage) image;
} else {
throw new ClassCastException("Image type is not compatible with BufferedImage");
}
}
// Method 3: Using ImageIO Class
public BufferedImage convertUsingImageIO(String filePath) throws IOException {
try {
File file = new File(filePath);
return ImageIO.read(file);
} catch (Exception e) {
throw new IOException("Error reading image file: " + e.getMessage());
}
}
}

69
image-processing/src/test/java/com/baeldung/image/resize/imagetobufferedimage/ImageToBufferedImageUnitTest.java Normal file
View File

@ -0,0 +1,69 @@
package com.baeldung.image.resize.imagetobufferedimage;
import com.baeldung.imageprocessing.imagetobufferedimage.ImageToBufferedImage;
import org.junit.Test;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
public class ImageToBufferedImageUnitTest {
Image image = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
public ImageToBufferedImageUnitTest() throws IOException {
}
@Test
public void whenConvertUsingConstructorWithValidDimensions_thenImageGeneratedWithoutError() {
ImageToBufferedImage converter = new ImageToBufferedImage();
BufferedImage bufferedImage = converter.convertUsingConstructor(image);
assertNotNull(bufferedImage);
assertEquals(image.getWidth(null), bufferedImage.getWidth());
assertEquals(image.getHeight(null), bufferedImage.getHeight());
}
@Test(expected = IllegalArgumentException.class)
public void whenConvertUsingConstructorWithInvalidDimensions_thenImageGeneratedWithError() {
ImageToBufferedImage converter = new ImageToBufferedImage();
converter.convertUsingConstructor(new BufferedImage(-100, -100, BufferedImage.TYPE_INT_ARGB));
}
@Test
public void whenConvertUsingCastingWithCompatibleImageType_thenImageGeneratedWithoutError() {
ImageToBufferedImage converter = new ImageToBufferedImage();
BufferedImage bufferedImage = converter.convertUsingCasting(image);
assertNotNull(bufferedImage);
assertEquals(image.getWidth(null), bufferedImage.getWidth());
assertEquals(image.getHeight(null), bufferedImage.getHeight());
}
@Test(expected = ClassCastException.class)
public void whenConvertUsingCastingWithIncompatibleImageType_thenImageGeneratedWithError() {
ImageToBufferedImage converter = new ImageToBufferedImage();
// PNG format is not directly supported by BufferedImage
Image image = new ImageIcon("src/main/resources/images/baeldung.png").getImage();
converter.convertUsingCasting(image);
}
@Test
public void whenConvertUsingImageIOWithValidFile_thenImageGeneratedWithoutError() throws IOException {
ImageToBufferedImage converter = new ImageToBufferedImage();
BufferedImage bufferedImage = converter.convertUsingImageIO("src/main/resources/images/sampleImage.jpg");
assertNotNull(bufferedImage);
assertEquals(image.getWidth(null), bufferedImage.getWidth());
assertEquals(image.getHeight(null), bufferedImage.getHeight());
}
@Test(expected = IOException.class)
public void whenConvertUsingImageIOWithInvalidFile_thenImageGeneratedWithError() throws IOException {
ImageToBufferedImage converter = new ImageToBufferedImage();
converter.convertUsingImageIO("invalid_file.jpg");
}
}