java图片的压缩算法

本是古典何须时尚 2022-12-07 15:12 206阅读 0赞

import javax.imageio.IIOImage;
    import javax.imageio.ImageIO;
    import javax.imageio.ImageWriteParam;
    import javax.imageio.ImageWriter;
    import java.awt.image.BufferedImage;
    import java.awt.image.ColorModel;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.Iterator;
    
    /**
     * 功能说明: 图片压缩
     * 功能描述: 图片压缩
     */
    public class CompressUtils {
    
      public static byte[] fromBufferedImage2(BufferedImage img, String imagType) throws IOException {
        // 得到指定Format图片的writer
        Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName(imagType);
        ImageWriter writer = iter.next();
    
        //ByteOutputStream bos = new ByteOutputStream();
        File outFile = new File("C:\\Users\\Desktop\\c.jpg");
        try (OutputStream out = new FileOutputStream(outFile)) {
          ImageWriteParam param = writer.getDefaultWriteParam();
          if (param.canWriteCompressed()) {
            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            // 设置压缩质量参数
            param.setCompressionQuality(0.5f);
            param.setProgressiveMode(ImageWriteParam.MODE_DISABLED);
            // 指定压缩时使用的色彩模式
            ColorModel colorModel = img.getColorModel();
            param.setDestinationType(new javax.imageio.ImageTypeSpecifier(colorModel,
                colorModel.createCompatibleSampleModel(img.getWidth(), img.getHeight())));
            writer.setOutput(ImageIO.createImageOutputStream(out));
            IIOImage iIamge = new IIOImage(img, null, null);
            writer.write(null, iIamge, param);
            writer.dispose();
          }
          return null;
        }
      }
    }