Java图片压缩并上传

public void uploadFile(@RequestParam(value = "file", required = false)MultipartFile[] file,HttpServletRequest request, HttpServletResponse response) throws IOException {
        //附件上传
        for (MultipartFile multipartFile : file) {
            //获取文件名
            String fileName = multipartFile.getOriginalFilename();
            if(null!=fileName && !"".equals(fileName)){
                try {
                    String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();//文件扩展名
                    String newfilename = StringUtil.getUUID() + "." + fileExt; //生成uuid文件名
                    String savePath = "upload/images/" + newfilename;
                    File folder=new File(PropUtils.get("web.root")+"upload/images");
                    if(!folder.exists()){
                        folder.mkdirs();//如果文件夹不存在 创建文件夹
                    }
                    //上传文件
//                  multipartFile.transferTo(new File(PropUtils.get("web.root") + savePath));

                    //压缩文件
                    ImageHelper.compress(multipartFile.getInputStream(), new File(PropUtils.get("web.root") + savePath), 700);

                    //数据库保存图片路径信息
                } catch (Exception e) {
                    e.printStackTrace();
                    return;
                }
            }
        }
    }

package com.xypt.utils;

import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;


/**
 * 图片工具类
 * @author
 * @description 图片压缩 截取
 *
 */
public class ImageHelper {
    /**
     * 实现图像的等比缩放
     *
     * @param source
     * @param targetW
     * @param targetH
     * @return
     */
    private static BufferedImage resize(BufferedImage source, int targetW, int targetH) {
        // targetW，targetH分别表示目标长和宽
        int type = source.getType();
        BufferedImage target = null;
        double sx = (double) targetW / source.getWidth();
        double sy = (double) targetH / source.getHeight();
        // 这里想实现在targetW，targetH范围内实现等比缩放。如果不需要等比缩放
        // 则将下面的if else语句注释即可
        if (sx < sy) {
            sx = sy;
            targetW = (int) (sx * source.getWidth());
        } else {
            sy = sx;
            targetH = (int) (sy * source.getHeight());
        }
        if (type == BufferedImage.TYPE_CUSTOM) { // handmade
            ColorModel cm = source.getColorModel();
            WritableRaster raster = cm.createCompatibleWritableRaster(targetW, targetH);
            boolean alphaPremultiplied = cm.isAlphaPremultiplied();
            target = new BufferedImage(cm, raster, alphaPremultiplied, null);
        } else
            target = new BufferedImage(targetW, targetH, type);
        Graphics2D g = target.createGraphics();
        // smoother than exlax:
        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
        g.dispose();
        return target;
    }

    /**
     * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false
     *
     * @param inFilePath
     *            要截取文件的路径
     * @param outFilePath
     *            截取后输出的路径
     * @param width
     *            要截取宽度
     * @param hight
     *            要截取的高度
     * @throws Exception
     */
    public static boolean compress(String inFilePath, String outFilePath, int width, int hight) {
        boolean ret = false;
        File file = new File(inFilePath);
        File saveFile = new File(outFilePath);
        InputStream in = null;
        try {
            in = new FileInputStream(file);
            ret = compress(in, saveFile, width, hight);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            ret = false;
        } finally {
            if (null != in) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return ret;
    }

    /**
     * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false
     *
     * @param in
     *            要截取文件流
     * @param outFilePath
     *            截取后输出的路径
     * @param width
     *            要截取宽度
     * @param hight
     *            要截取的高度
     * @throws Exception
     */
    public static boolean compress(InputStream in, File saveFile, int width, int hight) {
        // boolean ret = false;
        BufferedImage srcImage = null;
        try {
            srcImage = ImageIO.read(in);
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }

        if (width > 0 || hight > 0) {
            // 原图的大小
            int sw = srcImage.getWidth();
            int sh = srcImage.getHeight();
            // 如果原图像的大小小于要缩放的图像大小，直接将要缩放的图像复制过去
            if (sw > width && sh > hight) {
                srcImage = resize(srcImage, width, hight);
            } else {
                String fileName = saveFile.getName();
                String formatName = fileName.substring(fileName.lastIndexOf('.') + 1);
                try {
                    ImageIO.write(srcImage, formatName, saveFile);
                } catch (IOException e) {
                    e.printStackTrace();
                    return false;
                }
                return true;
            }
        }
        // 缩放后的图像的宽和高
        int w = srcImage.getWidth();
        int h = srcImage.getHeight();
        // 如果缩放后的图像和要求的图像宽度一样，就对缩放的图像的高度进行截取
        if (w == width) {
            // 计算X轴坐标
            int x = 0;
            int y = h / 2 - hight / 2;
            try {
                saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        }
        // 否则如果是缩放后的图像的高度和要求的图像高度一样，就对缩放后的图像的宽度进行截取
        else if (h == hight) {
            // 计算X轴坐标
            int x = w / 2 - width / 2;
            int y = 0;
            try {
                saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        }

        return true;
    }

    /**
     * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false
     *
     * @param in
     *            图片输入流
     * @param saveFile
     *            压缩后的图片输出流
     * @param proportion
     *            压缩后宽度
     * @throws Exception
     */
    public static boolean compress(InputStream in, File saveFile, float compress_width) {
        if (null == in || null == saveFile || compress_width < 1) {// 检查参数有效性
            // LoggerUtil.error(ImageHelper.class, "--invalid parameter, do
            // nothing!");
            return false;
        }

        BufferedImage srcImage = null;
        double multiple = 1.0d;
        try {
            srcImage = ImageIO.read(in);
            int original_width = srcImage.getWidth(); // 原始宽度
            if (original_width > compress_width) {
                multiple = original_width / compress_width; // 计算要达到指定宽度要缩放的倍数
            }
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

        // 原图的大小
        int width = (int) (srcImage.getWidth() / multiple);
        int hight = (int) (srcImage.getHeight() / multiple);

        srcImage = resize(srcImage, width, hight);

        // 缩放后的图像的宽和高
        int w = srcImage.getWidth();
        int h = srcImage.getHeight();
        // 如果缩放后的图像和要求的图像宽度一样，就对缩放的图像的高度进行截取
        if (w == width) {
            // 计算X轴坐标
            int x = 0;
            int y = h / 2 - hight / 2;
            try {
                saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        }
        // 否则如果是缩放后的图像的高度和要求的图像高度一样，就对缩放后的图像的宽度进行截取
        else if (h == hight) {
            // 计算X轴坐标
            int x = w / 2 - width / 2;
            int y = 0;
            try {
                saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        }

        return true;
    }

    /**
     * 实现缩放后的截图
     *
     * @param image
     *            缩放后的图像
     * @param subImageBounds
     *            要截取的子图的范围
     * @param subImageFile
     *            要保存的文件
     * @throws IOException
     */
    private static void saveSubImage(BufferedImage image, Rectangle subImageBounds, File subImageFile) throws IOException {
        if (subImageBounds.x < 0 || subImageBounds.y < 0 || subImageBounds.width - subImageBounds.x > image.getWidth() || subImageBounds.height - subImageBounds.y > image.getHeight()) {
            // LoggerUtil.error(ImageHelper.class, "Bad subimage bounds");
            return;
        }
        BufferedImage subImage = image.getSubimage(subImageBounds.x, subImageBounds.y, subImageBounds.width, subImageBounds.height);
        String fileName = subImageFile.getName();
        String formatName = fileName.substring(fileName.lastIndexOf('.') + 1);
        ImageIO.write(subImage, formatName, subImageFile);
    }

    public static void main(String[] args) throws Exception {

        InputStream in = null;
        // 缩放后需要保存的路径
        File saveFile = new File("d:/3_0.jpg");

        try {

            // 原图片的路径
            in = new FileInputStream(new File("d:/3.jpg"));

            if (compress(in, saveFile, 700)) {
                System.out.println("图片压缩完成！");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            in.close();
        }
    }
}