Java上传图片后的缩放
程序员文章站
2022-05-07 13:35:14
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import java.awt.Color; import java.awt.Graphics2D; import java.awt.Image; import java.awt.image.BufferedImage; import java.awt.image.ConvolveOp; import java.awt.image.Kernel; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import org.apache.commons.fileupload.FileItem; import org.apache.log4j.Logger; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class ImageUtil { /** * Logger for this class */ private static final Logger logger = Logger.getLogger(ImageUtil.class); public void imageScale(String srcFilePath, String targetFilePath, int width, int height) { this.imageScale(new File(srcFilePath), new File(targetFilePath), width, height); } public void imageScale(File srcFile, File targetFile, int width, int height) { try { Image image = javax.imageio.ImageIO.read(srcFile); image = image.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING); // Make a BufferedImage from the Image. BufferedImage mBufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = mBufferedImage.createGraphics(); g2.drawImage(image, 0, 0, width, height, Color.white, null); g2.dispose(); float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2, -0.125f, -0.125f, -0.125f, -0.125f }; Kernel kernel = new Kernel(3, 3, kernelData2); ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null); mBufferedImage = cOp.filter(mBufferedImage, null); File targetDir = targetFile.getParentFile(); if (!targetDir.exists()) targetDir.mkdirs(); FileOutputStream out = new FileOutputStream(targetFile); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(mBufferedImage); out.close(); } catch (Exception e) { logger.error( "imageScale(String, String, int, int) - 图片压缩出错 - srcFilePath=" + srcFile.getPath() + ", targeFilePath=" + targetFile.getPath() + ", width=" + width + ", height=" + height, e); } } public void imageScale(FileItem fileItem, String targetFilePath, int width, int height) { try { InputStream input = fileItem.getInputStream(); Image image = javax.imageio.ImageIO.read(input); image = image.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING); BufferedImage mBufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = mBufferedImage.createGraphics(); g2.drawImage(image, 0, 0, width, height, Color.white, null); g2.dispose(); float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2, -0.125f, -0.125f, -0.125f, -0.125f }; Kernel kernel = new Kernel(3, 3, kernelData2); ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null); mBufferedImage = cOp.filter(mBufferedImage, null); File target = new File(targetFilePath); File targetDir = target.getParentFile(); if (!targetDir.exists()) targetDir.mkdirs(); FileOutputStream out = new FileOutputStream(targetFilePath); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(mBufferedImage); out.close(); input.close(); } catch (Exception e) { logger.error( "imageScale(String, String, int, int) - 图片压缩出错 - fileItem=" + fileItem.getName() + ", targetFilePath=" + targetFilePath + ", width=" + width + ", height=" + height, e); } } public static void main(String[] args) { ImageUtil iu=new ImageUtil(); iu.imageScale("c:/uploadFiles/191540095661.jpg", "c:/uploadFiles/t.jpg", 270, 220); } }