如何使用java代码调整图片大小呢?

下文笔者讲述使用java代码调整图片大小的方法分享,如下所示
今天接到一个需求,需要将用户上传的图片调整为指定大小，那么java代码如何实现这一需求呢?
下文笔者将一一道来,如下所示

实现思路:
    使用Graphics2D类中的指定方法，即可调整图片的大小

BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
g.dispose();

BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
g.dispose();
g.setComposite(AlphaComposite.Src);
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);

例:调整图片大小的示例分享

import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
 
/*
 * @author java265.com
 *
 */
public class ImageTest {
 
	private static final int IMG_WIDTH = 100;
	private static final int IMG_HEIGHT = 100;
	
	public static void main(String [] args){
		
	try{
			
		BufferedImage originalImage = ImageIO.read(new File("D:\\test\\test20230127.jpg"));
		int type = originalImage.getType() == 0? BufferedImage.TYPE_INT_ARGB : originalImage.getType();
			
		BufferedImage resizeImageJpg = resizeImage(originalImage, type);
		ImageIO.write(resizeImageJpg, "jpg", new File("D:\\test\\test20230127_jpg.jpg")); 
			
		BufferedImage resizeImagePng = resizeImage(originalImage, type);
		ImageIO.write(resizeImagePng, "png", new File("D:\\test\\test20230127_png.jpg")); 
			
		BufferedImage resizeImageHintJpg = resizeImageWithHint(originalImage, type);
		ImageIO.write(resizeImageHintJpg, "jpg", new File("D:\\test\\test20230127_hint_jpg.jpg")); 
			
		BufferedImage resizeImageHintPng = resizeImageWithHint(originalImage, type);
		ImageIO.write(resizeImageHintPng, "png", new File("D:\\test\\test20230127_hint_png.jpg")); 
				
	}catch(IOException e){
		System.out.println(e.getMessage());
	}
		
    }
	
    private static BufferedImage resizeImage(BufferedImage originalImage, int type){
	BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
	Graphics2D g = resizedImage.createGraphics();
	g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
	g.dispose();
		
	return resizedImage;
    }
	
    private static BufferedImage resizeImageWithHint(BufferedImage originalImage, int type){
		
	BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
	Graphics2D g = resizedImage.createGraphics();
	g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
	g.dispose();	
	g.setComposite(AlphaComposite.Src);
 
	g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
	RenderingHints.VALUE_INTERPOLATION_BILINEAR);
	g.setRenderingHint(RenderingHints.KEY_RENDERING,
	RenderingHints.VALUE_RENDER_QUALITY);
	g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
	RenderingHints.VALUE_ANTIALIAS_ON);
	
	return resizedImage;
    }	
}