详解SpringMVC实现图片上传以及该注意的小细节

<form action="${path}/upload/uploadPic.do" method="post" enctype="multipart/form-data">   
<div>
    ![](${path}/mall/image/load_image.png)
    <input type="file" id="input-image" name="input-image">
    <input id="input-relative-path" name="imgs" type="hidden" >
    <input id="input-last-path" type="hidden">
    <input type="submit" value="上传图片">
 </div>
</form>

@Controller
@RequestMapping("/upload")
public class UploadController extends BaseController {
  @RequestMapping(value = "/uploadPic", method = RequestMethod.POST)
  @LoginCheck
  public void uploadPic(HttpServletRequest request, PrintWriter out, String lastRealPath) throws IOException {
    // 将当前上下文初始化给CommonsMultipartResolver
    CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
    // 检查form中是否有enctype＝"multipart／form－data"
    if (resolver.isMultipart(request)) {
      // 强制转化request
      MultipartHttpServletRequest req = (MultipartHttpServletRequest) request;
      // 从表单获取input名称
      Iterator<String> iterable = req.getFileNames();
      // 存在文件
      if (iterable.hasNext()) {
        String inputName = iterable.next();
        // 获得文件
        MultipartFile mf = req.getFile(inputName);
        byte[] mfs = mf.getBytes();
        // 定义文件名
        String fileName = new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());
        Random random = new Random();
        for (int i = 0; i < 3; i++) {
          fileName = fileName + random.nextInt(10);
        }
        // 获得后缀名
        String oriFileName = mf.getOriginalFilename();
        String suffix = oriFileName.substring(oriFileName.lastIndexOf("."));

        // 上传图片到本地
        String localPath = "/Users/ZR/Desktop/webPro/console/src/main/webapp/image/" + fileName + suffix;
        mf.transferTo(new File(localPath));

        // 获取图片的宽高
        BufferedImage bufferedImage = ImageIO.read(new FileInputStream(new File(localPath)));
        int width = bufferedImage.getWidth();
        int height = bufferedImage.getHeight();
        // 获取文件大小
        long size = mf.getSize();
      }
    }
  }
}

 <!--
  文件上传的视图解析器，id值是固定的
 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
  <property name="maxUploadSize" value="1024000"/>
  <!-- 其他属性 -->
</bean>