这里面使用的是 Thumbnails.java，这个可以对图片进行缩放，裁剪，修改大小等，

import net.coobird.thumbnailator.Thumbnails;

直接上代码

首先需要 导入maven的jar包

 <!-- Image scale and check --> <dependency>		 <groupId>net.coobird</groupId>		 <artifactId>thumbnailator</artifactId>		 <version>0.4.6</version>	 		</dependency>

我这里使用的主要是对图片进行验证是否是一张正常的图片，防止图片带木马；

import java.awt.image.BufferedImage;import java.io.*;import java.math.BigDecimal;import javax.imageio.ImageIO;import net.coobird.thumbnailator.Thumbnails;public class ImageUtil {	public static void main(String[] args) { 		thumbnailsCompressPic("C:\\Users\\admin\\Documents\\aaaaa.jpeg","d:\\car\\aaa_2.jpg",1); }public static boolean thumbnailsCompressPic(String inputFile, String outputFile, float quality) { File input = new File(inputFile); try { Thumbnails.of(input).scale(1.0).outputQuality(quality).toFile(outputFile);  return true; } catch (IOException e) { e.printStackTrace(); }  return false; }  public static boolean thumbnailsCompressPic(InputStream inputFile, String outputFile, float quality) {  try { Thumbnails.of(inputFile).scale(1.0).outputQuality(quality).toFile(outputFile);  return true; } catch (IOException e) { e.printStackTrace(); }  return false; }  }

上传Controller 代码；

@RequestMapping(value="/upload",method=RequestMethod.POST)	public Object upload(@RequestParam(value = "idCardPath") MultipartFile file,							HttpServletRequest request){		ResultSupport result = new ResultSupport();		log.debug("原始文件名称:"+file.getName()+","+file.getOriginalFilename()); 		//max size 1048576 log.debug("=====getFileSize==="+file.getSize());  if (file.isEmpty()) {	 	result.setSuccess(false);			result.setResultMsg( "请选择照片；");			return result;		}		String fileName = file.getOriginalFilename();		String suffix = fileName.substring(fileName.lastIndexOf("."));		//check suffix		String supportPicture = ".png,.jpg,.jpeg,.PNG,.JPG,.JPEG";		if (!supportPicture.contains(suffix)) {			result.setSuccess(false);			result.setResultMsg( "图片格式不正确，只支持.png,.jpg,.jpeg");			return result;		}		fileName = System.currentTimeMillis()+Utils.getRandomString(8) + suffix;		int size = (int) file.getSize();		String filePath = request.getRealPath("/uploadid/");		File folder = new File(filePath);		if (!folder.exists() ) {			log.debug("make dir");			folder.mkdirs();		}		String fullFilePath =filePath+fileName;		String errMsg="";		try {			//check image 			boolean imageresult= ImageUtil.thumbnailsCompressPic(file.getInputStream(), fullFilePath, 1);			/*			file.transferTo(dest); // 保存文件，这是之前 的方法，不会对文件进行校验，不安全			*/			if (!imageresult) {				result.setSuccess(false);				result.setResultMsg( "错误的图片");				log.debug("error="+filePath);								return result;			}							filePath="/uploadid/"+fileName;				log.debug("upload success"); 						result.setResultMsg( filePath);			result.setSuccess(true);			return result;		} catch (IllegalStateException e) {			e.printStackTrace();			errMsg = "导入失败:" + e.getMessage();		} catch (IOException e) {			e.printStackTrace();			errMsg = "导入失败:" + e.getMessage();		}catch (Exception e) {			e.printStackTrace();			errMsg = "导入失败:" + e.getMessage();		}		result.setResultMsg( errMsg); result.setSuccess(false);		return result;	}