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);
        }
    }
}