JAVA压缩图片 服务器端压缩图片 原创

 @RequestMapping(value = "/uploadImage", method = RequestMethod.POST)

    @ResponseBody

    public String uploadImage(HttpServletRequest request) throws IOException {

        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

        Iterator<String> iterator = multipartRequest.getFileNames();

        String fileName = "";

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");

        String dir = "upload/" + sdf.format(new Date()) + "/";

        String realPath = request.getSession().getServletContext().getRealPath("/");

        String suffix = "";

        while (iterator.hasNext()) {

            MultipartFile multipartFile = multipartRequest.getFile(iterator.next());

            if (multipartFile != null) {

                String fn = multipartFile.getOriginalFilename();

                suffix = fn.substring(fn.lastIndexOf("."));

                fileName = Utils.getRandomStringByLength(6) + suffix;

                String path = realPath + dir + fileName;

                path = path.replace("\\", "/");

                File f = new File(path);

                if (!f.mkdirs()) {

                    f.mkdir();

                }

                multipartFile.transferTo(f);

            }

        }

        PictureUtil.Tosmallerpic(realPath + dir, new File((realPath + dir + fileName).replace("\\", "/")), suffix, fileName, (float) 0.1);

        return dir +fileName;

    }

package com.property.client.util;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGEncodeParam;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.logging.Level;

/**

 */

public class PictureUtil {

    private final static Logger logger = LoggerFactory.getLogger(PictureUtil.class);

    /**

     * @param originalFilePath          原图片所在的文件夹路径

     * @param originalFileObject        原图片路径

     * @param originalFileExtensionName 原图片扩展名

     * @param originalFileName          原图片名

     * @param percent             压缩百分比

     */

    public static void Tosmallerpic(String originalFilePath, File originalFileObject, String originalFileExtensionName, String originalFileName, float percent) {

        Image src;

        try {

            src = javax.imageio.ImageIO.read(originalFileObject); //构造Image对象

            String img_midname = originalFilePath + originalFileName.substring(0, originalFileName.indexOf(".")) + originalFileExtensionName + "_small";

            BufferedImage tag = new BufferedImage(src.getWidth(null), src.getHeight(null), BufferedImage.TYPE_INT_RGB);

            //tag.getGraphics().drawImage(src,0,0,new_w,new_h,null); //绘制缩小后的图

            tag.getGraphics().drawImage(src.getScaledInstance(src.getWidth(null), src.getHeight(null), Image.SCALE_SMOOTH), 0, 0, null);

            FileOutputStream newImage = new FileOutputStream(img_midname); //输出到文件流

            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newImage);

            JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);

            /* 压缩质量 */

            jep.setQuality(percent, true);

            encoder.encode(tag, jep);

            //encoder.encode(tag); //近JPEG编码

            newImage.close();

        } catch (IOException ex) {

            logger.error("图片压缩失败", ex);

        }

    }

}