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>