Java修改图片大小尺寸的简单实现
目录
- 方式一:使用Image.getScaledInstance
- 测试
- 方式二:使用Thumbnailator
- 测试
方式一:使用Image.getScaledInstance 使用jdk的awt包下的Image.getScaledInstance实现图片的缩放。好处是无需引入第三方jar,缺点是会稍微有点模糊。
工具类ImageUtils:
package utils; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; public class ImageUtils {/*** 通过BufferedImage图片流调整图片大小*/public static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) throws IOException {Image resultingImage = originalImage.getScaledInstance(targetWidth, targetHeight, Image.SCALE_AREA_AVERAGING); BufferedImage outputImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB); outputImage.getGraphics().drawImage(resultingImage, 0, 0, null); return outputImage; }/*** BufferedImage图片流转byte[]数组*/public static byte[] imageToBytes(BufferedImage bImage) {ByteArrayOutputStream out = new ByteArrayOutputStream(); try {ImageIO.write(bImage, "jpg", out); } catch (IOException e) {e.printStackTrace(); }return out.toByteArray(); }/*** byte[]数组转BufferedImage图片流*/private static BufferedImage bytesToBufferedImage(byte[] ImageByte) {ByteArrayInputStream in = new ByteArrayInputStream(ImageByte); BufferedImage image = null; try {image = ImageIO.read(in); } catch (IOException e) {e.printStackTrace(); }return image; }}
测试
1.通过 url 获取图片并调整大小后保存:
import utils.ImageUtils; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.net.URL; public class Test {public static void main(String[] args) {try {//通过url获取BufferedImage图像缓冲区URL img = new URL("https://img1.360buyimg.com/image/jfs/t1/38591/20/3737/314695/5cc69c01E1838df09/dd6dce681bd23031.jpg"); BufferedImage image = ImageIO.read(img); //获取图片的宽、高System.out.println("Width: " + image.getWidth()); System.out.println("Height: " + image.getHeight()); //调整图片大小为 400X400尺寸BufferedImage newImage = ImageUtils.resizeImage(image,400,400); //将缓冲区图片保存到 F:/test/pic1.jpg (文件不存在会自动创建文件保存,文件存在会覆盖原文件保存)ImageIO.write(newImage, "jpg", new File("F:/test/pic1.jpg")); } catch (IOException e) {e.printStackTrace(); }}}
2.通过读取图片文件调整大小再保存:
import utils.ImageUtils; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.IOException; public class Test {public static void main(String[] args) {try {//读取原始图片BufferedImage image = ImageIO.read(new FileInputStream("F:/test/pic1.jpg")); System.out.println("Width: " + image.getWidth()); System.out.println("Height: " + image.getHeight()); //调整图片大小BufferedImage newImage = ImageUtils.resizeImage(image,200,200); //图像缓冲区图片保存为图片文件(文件不存在会自动创建文件保存,文件存在会覆盖原文件保存)ImageIO.write(newImage, "jpg", new File("F:/test/pic2.jpg")); } catch (IOException e) {e.printStackTrace(); }}}
3.MultipartFile类型的图片文件调整大小再保存:
public JSONObject imageSizeAdjustment(MultipartFile file) {JSONObject result = new JSONObject(); try {//从MultipartFile 中获取 byte[]byte[] bytes = file.getBytes(); //byte[]转 InputStream InputStream in = new ByteArrayInputStream(bytes); //读取图片输入流为 BufferedImage BufferedImage image = ImageIO.read(in); System.out.println("Width: " + image.getWidth()); System.out.println("Height: " + image.getHeight()); //调整图片大小BufferedImage newImage = ImageUtils.resizeImage(image, 200, 200); //图像缓冲区图片保存为图片文件(文件不存在会自动创建文件保存,文件存在会覆盖原文件保存)ImageIO.write(newImage, "jpg", new File("F:/test/pic2.jpg")); } catch (IOException e) {e.printStackTrace(); }result.put("code", 1); result.put("note", "成功"); return result; }
方式二:使用Thumbnailator Thumbnailator是Java的开源图像大小调整库,它使用渐进式双线性缩放。它支持JPG,BMP,JPEG,WBMP,PNG和GIF。
通过将以下Maven依赖项添加到我们的pom.xml中,将其包括在我们的项目中:
net.coobird thumbnailator0.4.11
工具类ThumbnailsUtils:
import net.coobird.thumbnailator.Thumbnails; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; public class ThumbnailsUtils{private static final Logger logger = LoggerFactory.getLogger(ThumbnailsUtils.class); /*** 通过BufferedImage图片流调整图片大小*/public static BufferedImage resizeImageOne(BufferedImage originalImage, int targetWidth, int targetHeight) throws Exception {ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); Thumbnails.of(originalImage).size(targetWidth, targetHeight).outputFormat("JPEG").outputQuality(1).toOutputStream(outputStream); byte[] data = https://www.it610.com/article/outputStream.toByteArray(); ByteArrayInputStream inputStream = new ByteArrayInputStream(data); return ImageIO.read(inputStream); }/*** BufferedImage图片流转byte[]数组*/public static byte[] imageToBytes(BufferedImage bImage) {ByteArrayOutputStream out = new ByteArrayOutputStream(); try {ImageIO.write(bImage,"jpg", out); } catch (IOException e) {logger.error("错误信息: ", e); }return out.toByteArray(); }/*** byte[]数组转BufferedImage图片流*/private static BufferedImage bytesToBufferedImage(byte[] ImageByte) {ByteArrayInputStream in = new ByteArrayInputStream(ImageByte); BufferedImage image = null; try {image = ImageIO.read(in); } catch (IOException e) {logger.error("错误信息: ", e); }return image; }}
测试
和上面测试基本一样只不过 ImageUtils.resizeImage换成 ThumbnailsUtils.resizeImageOne即可。
最终效果:
原图:
文章图片
长宽缩为原来的三分之一后的图:
文章图片
如果需要将 BufferedImage 转换为 MultipartFile,请参考我另一篇文章:
BufferedImage转换为MultipartFile
其他图片大小调整方法请参考:
How Can I Resize an Image Using Java
【Java修改图片大小尺寸的简单实现】以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。
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