修改版imageio图片压缩工具

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageOutputStream;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.imageio.plugins.jpeg.JPEGImageWriter;

 public class ImgCompress {

    /**
     * @param im
     *            原始图像
     * @param resizeTimes
     *            倍数,比如0.5就是缩小一半,0.98等等double类型
     * @return 返回处理后的图像
     */
    public BufferedImage zoomImage(String src) {

        BufferedImage result = null;

        try {
            File srcfile = new File(src);
            if (!srcfile.exists()) {
                System.out.println("文件不存在");

            }
            BufferedImage im = ImageIO.read(srcfile);

            /* 原始图像的宽度和高度 */
            int width = im.getWidth();
            int height = im.getHeight();

            //压缩计算
            //最后压缩大小比例由resizeTimes控制，可以根据需要修改为0到1
            float resizeTimes = 0.5f;  /*这个参数是要转化成的倍数,如果是1就是转化成1倍*/

            /* 调整后的图片的宽度和高度 */
            int toWidth = (int) (width * resizeTimes);
            int toHeight = (int) (height * resizeTimes);

            /* 新生成结果图片 */
            result = new BufferedImage(toWidth, toHeight,
                    BufferedImage.TYPE_INT_RGB);

            result.getGraphics().drawImage(
                    im.getScaledInstance(toWidth, toHeight,
                            java.awt.Image.SCALE_SMOOTH), 0, 0, null);


        } catch (Exception e) {
            System.out.println("创建缩略图发生异常" + e.getMessage());
        }

        return result;

    }

     public boolean writeHighQuality(BufferedImage im, String fileFullPath) {
         float JPEGcompression = 0.5f;
            try {
                /*输出到文件流*/
                FileOutputStream newimage = new FileOutputStream(fileFullPath);
                //下面注释掉为老方法，用下面的新的ImageIO来处理，适应更好
                /*JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);
                JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(im);
                 压缩质量 
                jep.setQuality(0.9f, true);
                encoder.encode(im, jep);
               近JPEG编码
                newimage.close();*/
             // 新的方法
                int dpi = 200;//分辨率
                saveAsJPEG(dpi, im, JPEGcompression, newimage);
                //关闭输出流
                newimage.close();
                //返回压缩后的图片地址
                return true;
            } catch (Exception e) {
                return false;
            }
        }

     public static void saveAsJPEG(Integer dpi, BufferedImage image_to_save,
             float JPEGcompression, FileOutputStream fos) throws IOException {
         // Image writer
         JPEGImageWriter imageWriter = (JPEGImageWriter) ImageIO
                 .getImageWritersBySuffix("jpg").next();
         ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
         imageWriter.setOutput(ios);
         // and metadata
         IIOMetadata imageMetaData = imageWriter.getDefaultImageMetadata(
                 new ImageTypeSpecifier(image_to_save), null);

         if (JPEGcompression >= 0 && JPEGcompression <= 1f) {
             JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter
                     .getDefaultWriteParam();
             jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
             jpegParams.setCompressionQuality(JPEGcompression);

         }
         imageWriter.write(imageMetaData,
                 new IIOImage(image_to_save, null, null), null);
         ios.close();
         imageWriter.dispose();

     }
     
     public static void main(String[] args) {
         /*模拟原图片的文件夹地址*/
         String inputFoler = "E:\\ceshitu\\one\\20160803_130742.jpg" ; 
         /*转换后的图片存放地址*/
        String outputFolder = "E:\\ceshitu\\one\\11.jpg";  
        ImgCompress narrowImage = new ImgCompress();
        narrowImage.writeHighQuality(narrowImage.zoomImage(inputFoler), outputFolder);

    }

}