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上传图片，防止忘记，随时可以看！！

 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                    req.getSession().getServletContext());

            // 检查form是否有enctype="multipart/form-data"
            if (multipartResolver.isMultipart(req)) {
                MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) req;

                Iterator<String> iter = multiRequest.getFileNames();
                if (iter.hasNext()) {

                    // 由CommonsMultipartFile继承而来,拥有上面的方法.
                    MultipartFile file = multiRequest.getFile(iter.next());
                    if (file != null) {
                    	 //request.getContextPath()返回当前页面所在的应用的名字
                    	String path = req.getContextPath();
                        //request.getScheme()返回当前请求所使用的协议;request.getServerName()返回当前页面所在的服务器的名字
                    	String basePath = req.getScheme()+"://"+req.getServerName()+":"+req.getServerPort()+path+"";
                    	

                    	//String portraitPath = basePath+"/"+user.getPortraitPath(); //获取用户头像地址

                        String filenameOld = file.getOriginalFilename();
                        String extName = filenameOld.substring(filenameOld.lastIndexOf("."));// 扩展名
                         
                        String filename = StringHelper.randomString(10, StringHelper.SEED_LANDL) + extName;//上传后文件名规则： 10为随机数+原文件后缀
                        String savePath2 = req.getSession().getServletContext().getRealPath("");  
                        savePath2 = savePath2.replaceAll("\\\\","/");

                        //String savePath = req.getSession().getServletContext().getRealPath("/portrait/temporary/"); //文件夹
                        String savePath = StaticProperties.getProperty("temporaryPath"); //获取临时文件夹目录
                        String webPath = StaticProperties.getProperty("webPath");
                       
                        
                        String path1 = savePath.substring(savePath.indexOf(webPath), savePath.length())+filename; //截取网络访问地址用于预览
                        String path2 = savePath.substring(savePath.indexOf(webPath), savePath.length())+"";
                        String save =savePath2+"/"+path2;
                        String save1 =save+""+filename;
                        File localFile = new File(save, filename);

                        if (!localFile.getParentFile().exists()) {
                            localFile.getParentFile().mkdirs();
                        }
                        
                        file.transferTo(localFile); //保存原头像
                        
                        reduce(savePath,filename, 300, 350,true); //压缩头像
                        
                        resp.getWriter().write("{\"uploadMsg\": \"success\", \"portraitName\": \"" +filename + "\", \"portraitPath\": \"" +path1+ "\"}");

                        return null;
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();  

            try {
                resp.getWriter().write("{\"uploadMsg\": \"failure\"}");
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }

        return null;

@param base 根目录
  * @param imgPath 要压缩的图片路径
  * @param width 压缩宽
  * @param height 压缩高
  * @param percentage 是否等比例压缩,true则宽高比自动调整

File srcfile = new File(base+"/"+imgPath);
 			BufferedImage src = ImageIO.read(srcfile);
 			if (percentage) {
 				double rate1 = ((double) src.getWidth(null)) / (double) width + 0.1;
 				double rate2 = ((double) src.getHeight(null)) / (double) height + 0.1;
 				double rate = rate1 > rate2 ? rate1 : rate2;
 				width = (int) (((double) src.getWidth(null)) / rate);
 				height = (int) (((double) src.getHeight(null)) / rate);
 			}
 			BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);				
 			image.getGraphics().drawImage(src.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING), 0, 0, null);
 			FileOutputStream out = new FileOutputStream(base+"/"+imgPath);
 			JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
 			encoder.encode(image);
 			image.flush();
 			out.flush();
 			out.close();
 			src.flush();